Microcomputer Systems 1 ADSP-BF533 Ez-Kit Lite Audio Interface

15 November 2015Veton Këpuska2 Lab #3 Audio Interface

15 November 2015Veton Këpuska3 ADSP-BF533 Ez-Kit Lite Audio Interface SPI SPORT0

15 November 2015Veton Këpuska4 BF533 EZ-Kit Lite – Audio Interface  EZ-Kit Lite contains AD1836 Audio Codec  The AD1836 audio codec provides three channels of stereo audio output and two channels of multi-channel/stereo 96 kHz input.  The SPORT0 interface of the processor links with the stereo audio data input and output pins of the AD1836 codec.  The processor is capable of transferring data to the audio codec in time-division multiplexed (TDM) or two-wire interface (TWI) mode.  The TDM mode can operate at a maximum of 48 kHz sample rate but allows simultaneous use of all input and output channels.  The TWI mode allows the codec to operate at a 96 kHz sample rate but limits the output channels to two. When using TWI mode, the TSCLK0 and RSCLK0 pins, as well as the TFS0 and RFS0 pins of the processor, must be tied together external to the processor. This is accomplished with the SW9 DIP switch (see “Push Button Enable Switch (SW9)” on page 2-12 for more information).

15 November 2015Veton Këpuska5 Blackfin Audio Interface Usage  Two-Wire Interface (TWI) and Serial Peripheral Interface (SPI) Forward channel used to configure and control audio converters Reverse channel relays feedback info from converters  SPORT’s Used as data channel for audio data SPORT TX connects to audio DAC SPORT RX connects to audio ADC Full-duplex SPORT RX/TX connects to audio codec  In some codecs (e.g., AC97), SPORT also can serve as the codec control channel

15 November 2015Veton Këpuska6 BF533 Interface with AD1871 Configuration & Control Data Transfer & Synch

15 November 2015Veton Këpuska7 SW9 Switch Configuration  Make sure that SW9 switches 5 and 6 are ON & SW12 is ON. See explanation bellow:

15 November 2015Veton Këpuska8 Switch Default Configuration

15 November 2015Veton Këpuska9 Push-buttons and LED’s

15 November 2015Veton Këpuska10 Push Button Enable Switch (SW9 & SW12)  SW9 Positions 1 through 4:  Disconnects the drivers associated with the push buttons from the PF pins of the processor. Positions 5 and 6:  Used to connect the transmit and receive frame syncs and clocks of SPORT0.  This is important when the AD1836 audio/video decoder and the processor are communicating in I 2 S mode.  SW12 When is set to OFF, SW12 disconnects SPORT0 from the audio codec. The default is the ON position.  Table 2-6 in the next slide shows which PF is driven when the switch is in the default (ON) position.

15 November 2015Veton Këpuska11 Push Button Enable Switch (SW9) Table 2-6 shows which PF is driven when the switch is in the default (ON) position

15 November 2015Veton Këpuska12 SPORT0 interface to AD1836 audio codec  The SPORT0 connects to the AD1836 audio codec and the expansion interface.  The AD1836 codec uses both the primary and secondary data transmit and receive pins to input and output data from the audio inputs and outputs.  The SPORT1 connects to the SPORT connector (P3) and the expansion interface.  The pinout of the SPORT connector and the expansion interface connectors can be found in “ADSP-BF533 EZ-KIT Lite Schematic” on page B- 1.

15 November 2015Veton Këpuska13 The pin layout of the SPORT connector & expansion interface connectors SW12

15 November 2015Veton Këpuska14 Audio Interface Configuration  The AD1836 audio codec’s internal configuration registers are configured using the Serial Port Interface - SPI port of the processor (see Slide #6).see Slide #6 The processor’s PF4 - programmable flag pin is used as the select for this device. For information on how to configure the multi-channel codec, go to AD1836_prc.pdf.

15 November 2015Veton Këpuska15 Audio Interface and Programmable Flags  The processor has 15 programmable flag pins (PF’s). The pins are multifunctional and depend on the processor setup. Table 2-1 in the ADSP-BF533 EZ-KIT Lite Evaluation System Manual provides the summary of the programmable flag pins used on the EZ-Kit Lite.

15 November 2015Veton Këpuska16 Programmable Flag Connections

15 November 2015Veton Këpuska17 Audio Interface Configuration (cont.)  The general-purpose IO pin PA0 of flash A is a source for the AD1836 codec reset. See “Flash General-Purpose IO” on page for more information about the pin of ADSP-BF533 EZ-KIT Lite Evaluation System Manual. Also information given in the next slide.

15 November 2015Veton Këpuska18 AD1836 codec reset via PA0

15 November 2015Veton Këpuska19 Flash General-Purpose IO  General-purpose IO signals are controlled by means of setting appropriate registers of the flash A or flash B.  These registers are mapped into the processor’s address space, as shown in the Table below (ADSP-BF533 EZ-KIT Lite Evaluation System Manual – Flash Memory)

15 November 2015Veton Këpuska20 Flash General-Purpose IO  Flash device IO pins are arranged as 8-bit ports labeled A through G.  There is a set of 8-bit registers associated with each port. These registers are Direction, Data In, and Data Out. Note that the Direction and Data Out registers are cleared to all zeros at power-up or hardware reset.  The Direction register controls IO pins direction. This is a 8-bit read-write register. When a bit is 0, a corresponding pin functions as an input. When the bit is 1, a corresponding pin is an output.  The Data In register allows reading the status of port’s pins. This is a 8-bit read-only register.  The Data Out register allows clearing an output pin to 0 or setting it to 1. This is a 8-bit read-write register.  The ADSP-BF533 EZ-KIT Lite board employs only flash A and flash B ports A and B. Table 1-5 and Table 1-6 provide configuration register addresses for flash A and flash B, respectively (only ports A and B are listed in the next slide). The following bits connect to the expansion board connector.  Flash A: port A bits 7 and 6, as well as port B bits 7 and 6  Flash B: port A bits 7–0

15 November 2015Veton Këpuska21 Flash A & B Configuration Registers for Ports A and B.  Table 1-5. Flash A Configuration Registers for Ports A and B  Table 1-6. Flash B Configuration Registers for Ports A and B Register NamePort A AddressPort B Address Data In (read-only) 0x x Data Out (read-write) 0x x Direction (read-write) 0x x Register NamePort A AddressPort B Address Data In (read-only) 0x202E 00000x202E 0001 Data Out (read-write) 0x202E 00040x202E 0005 Direction (read-write) 0x202E 00060x202E 0007

15 November 2015Veton Këpuska22 IO Assignments for Port A and B  Table 1-7 Flash A Port A Controls. Bit NumberUser IOBit Value 7Not definedAny 6Not definedAny 5PPI clock select bit 1 00=local OSC (27MHz) 4PPI clock select bit 0 01=video decoder pixel clock 1x=expansion board PPI clock 3Video decoder reset0=reset ON; 1=reset OFF 2Video encoder reset0=reset ON; 1=reset OFF 1ReservedAny 0Codec reset0=reset ON; 1=reset OFF

Talk-Through Analysis of Lab Exercise

15 November 2015Veton Këpuska24 main.c // // // // Name: Talkthrough for the ADSP-BF533 EZ-KIT Lite // // // // // //(C) Copyright Analog Devices, Inc. All rights reserved. // // //Project Name:BF533 C Talkthrough TDM // // //Date Modified:04/03/03HDRev 1.0 // // //Software:VisualDSP++3.1 // // //Hardware:ADSP-BF533 EZ-KIT Board // // //Connections:Connect an input source (such as a radio) to the Audio // //input jack and an output source (such as headphones) to // //the Audio output jack // // //Purpose:This program sets up the SPI port on the ADSP-BF533 to // //configure the AD1836 codec. The SPI port is disabled // //after initialization. The data to/from the codec are // //transfered over SPORT0 in TDM mode // // // // #include "Talkthrough.h" #include "sysreg.h" #include "ccblkfn.h" #include

15 November 2015Veton Këpuska25 Talkthrough.h #ifndef __Talkthrough_DEFINED #define __Talkthrough_DEFINED // // // Header files // // // #include // // // Symbolic constants // // // // addresses for Port B in Flash A #define pFlashA_PortA_Dir (volatile unsigned char *)0x #define pFlashA_PortA_Data (volatile unsigned char *)0x // names for codec registers, used for iCodec1836TxRegs[] #define DAC_CONTROL_10x0000 #define DAC_CONTROL_20x1000 #define DAC_VOLUME_00x2000 #define DAC_VOLUME_10x3000 #define DAC_VOLUME_20x4000 #define DAC_VOLUME_30x5000 #define DAC_VOLUME_40x6000 #define DAC_VOLUME_50x7000 #define ADC_0_PEAK_LEVEL 0x8000 #define ADC_1_PEAK_LEVEL 0x9000 #define ADC_2_PEAK_LEVEL 0xA000 #define ADC_3_PEAK_LEVEL 0xB000 #define ADC_CONTROL_10xC000 #define ADC_CONTROL_20xD000 #define ADC_CONTROL_30xE000

15 November 2015Veton Këpuska26 Flash A & B Configuration Registers for Ports A and B.  Table 1-5. Flash A Configuration Registers for Ports A and B  Table 1-6. Flash B Configuration Registers for Ports A and B Register NamePort A AddressPort B Address Data In (read-only) 0x x Data Out (read-write) 0x x Direction (read-write) 0x x Register NamePort A AddressPort B Address Data In (read-only) 0x202E 00000x202E 0001 Data Out (read-write) 0x202E 00040x202E 0005 Direction (read-write) 0x202E 00060x202E 0007

15 November 2015Veton Këpuska27 DAC Control Register 1 & 2 From: AD1836A Multi-channel Codec Manual #define DAC_CONTROL_10x0000 #define DAC_CONTROL_20x1000

15 November 2015Veton Këpuska28 DAC Volume Control Registers #define DAC_VOLUME_00x2000 #define DAC_VOLUME_10x3000 #define DAC_VOLUME_20x4000 #define DAC_VOLUME_30x5000 #define DAC_VOLUME_40x6000 #define DAC_VOLUME_50x7000

15 November 2015Veton Këpuska29 ADC Peak Level Registers #define ADC_0_PEAK_LEVEL 0x8000 #define ADC_1_PEAK_LEVEL 0x9000 #define ADC_2_PEAK_LEVEL 0xA000 #define ADC_3_PEAK_LEVEL 0xB000

15 November 2015Veton Këpuska30 ADC Control Register 1 #define ADC_CONTROL_10xC000 #define ADC_CONTROL_20xD000 #define ADC_CONTROL_30xE000

15 November 2015Veton Këpuska31 ADC Control Register 2 #define ADC_CONTROL_10xC000 #define ADC_CONTROL_20xD000 #define ADC_CONTROL_30xE000

15 November 2015Veton Këpuska32 ADC Control Register 3 #define ADC_CONTROL_10xC000 #define ADC_CONTROL_20xD000 #define ADC_CONTROL_30xE000

15 November 2015Veton Këpuska33 Talkthrough.h (cont. 1) // names for slots in ad1836 audio frame #define INTERNAL_ADC_L00 #define INTERNAL_ADC_L11 #define INTERNAL_ADC_R04 #define INTERNAL_ADC_R15 #define INTERNAL_DAC_L00 #define INTERNAL_DAC_L11 #define INTERNAL_DAC_L22 #define INTERNAL_DAC_R04 #define INTERNAL_DAC_R15 #define INTERNAL_DAC_R26 // size of array iCodec1836TxRegs and iCodec1836RxRegs #define CODEC_1836_REGS_LENGTH11 // SPI transfer mode #define TIMOD_DMA_TX 0x0003 // SPORT0 word length #define SLEN_320x001f // DMA flow mode #define FLOW_10x1000

15 November 2015Veton Këpuska34 Talkthrough.h (cont. 2) // // // Global variables // // // extern int iChannel0LeftIn; extern int iChannel0RightIn; extern int iChannel0LeftOut; extern int iChannel0RightOut; extern int iChannel1LeftIn; extern int iChannel1RightIn; extern int iChannel1LeftOut; extern int iChannel1RightOut; extern volatile short sCodec1836TxRegs[]; extern volatile int iRxBuffer1[]; extern volatile int iTxBuffer1[]; // // // Prototypes // // // // in file Initialisation.c void Init_EBIU(void); void Init_Flash(void); void Init1836(void); void Init_Sport0(void); void Init_DMA(void); void Init_Sport_Interrupts(void); void Enable_DMA_Sport0(void); // in file Process_data.c void Process_Data(void); // in file ISRs.c EX_INTERRUPT_HANDLER(Sport0_RX_ISR); #endif //__Talkthrough_DEFINED

15 November 2015Veton Këpuska35 main.c #include "Talkthrough.h" #include "sysreg.h" #include "ccblkfn.h" #include // // // Variables // // // Description: The variables iChannelxLeftIn and iChannelxRightIn contain // //the data coming from the codec AD1836. The (processed) // //playback data are written into the variables // //iChannelxLeftOut and iChannelxRightOut respectively, which // //are then sent back to the codec in the SPORT0 ISR. // //The values in the array iCodec1836TxRegs can be modified to // //set up the codec in different configurations according to // //the AD1885 data sheet. // // // // left input data from ad1836 int iChannel0LeftIn, iChannel1LeftIn; // right input data from ad1836 int iChannel0RightIn, iChannel1RightIn; // left ouput data for ad1836 int iChannel0LeftOut, iChannel1LeftOut; // right ouput data for ad1836 int iChannel0RightOut, iChannel1RightOut; // SPORT0 DMA transmit buffer volatile int iTxBuffer1[8]; // SPORT0 DMA receive buffer volatile int iRxBuffer1[8];

15 November 2015Veton Këpuska36 main.c (cont 1) // array for registers to configure the ad1836 names are defined in "Talkthrough.h" volatile short sCodec1836TxRegs[CODEC_1836_REGS_LENGTH] = { DAC_CONTROL_1| 0x000, DAC_CONTROL_2| 0x000, DAC_VOLUME_0| 0x3ff, DAC_VOLUME_1| 0x3ff, DAC_VOLUME_2| 0x3ff, DAC_VOLUME_3| 0x3ff, DAC_VOLUME_4| 0x3ff, DAC_VOLUME_5| 0x3ff, ADC_CONTROL_1| 0x000, ADC_CONTROL_2| 0x180, ADC_CONTROL_3| 0x000 }; #define DAC_CONTROL_10x0000 | 0x000 = 0x0000 #define DAC_CONTROL_20x1000 | 0x000 = 0x1000 #define DAC_VOLUME_00x2000 | 0x3ff = 0x23ff #define DAC_VOLUME_10x3000 | 0x3ff = 0x33ff #define DAC_VOLUME_20x4000 | 0x3ff = 0x43ff #define DAC_VOLUME_30x5000 | 0x3ff = 0x53ff #define DAC_VOLUME_40x6000 | 0x3ff = 0x63ff #define DAC_VOLUME_50x7000 | 0x3ff = 0x73ff #define ADC_CONTROL_10xC000 | 0x000 = 0xC000 #define ADC_CONTROL_20xD000 | 0x180 = 0xD180 #define ADC_CONTROL_30xE000 | 0x000 = 0xE000

15 November 2015Veton Këpuska37 DAC Volume Control Registers #define DAC_VOLUME_00x23ff #define DAC_VOLUME_10x33ff #define DAC_VOLUME_20x43ff #define DAC_VOLUME_30x53ff #define DAC_VOLUME_40x63ff #define DAC_VOLUME_50x73ff

15 November 2015Veton Këpuska38 ADC Peak Level Registers #define ADC_0_PEAK_LEVEL 0x8000 #define ADC_1_PEAK_LEVEL 0x9000 #define ADC_2_PEAK_LEVEL 0xA000 #define ADC_3_PEAK_LEVEL 0xB000

15 November 2015Veton Këpuska39 ADC Control Register 1 #define ADC_CONTROL_10xC

15 November 2015Veton Këpuska40 ADC Control Register 2 #define ADC_CONTROL_20xD

15 November 2015Veton Këpuska41 ADC Control Register 3 #define ADC_CONTROL_30xE

15 November 2015Veton Këpuska42 ADC Master Mode

15 November 2015Veton Këpuska43 ADC Slave Mode

15 November 2015Veton Këpuska44 main.c (cont 2) // SPORT0 DMA transmit buffer volatile int iTxBuffer1[8]; // SPORT0 DMA receive buffer volatile int iRxBuffer1[8]; //////////////////// // BTC Definitions //////////////////// #define MAXBTCBUF int BTCLeft[MAXBTCBUF]; int BTCRight[MAXBTCBUF]; int BTCLeftVolume = 0; int BTCRightVolume = 0; BTC_MAP_BEGIN // Channel Name, Starting Address, Length (bytes) BTC_MAP_ENTRY("Audio Left Channel", (long)&BTCLeft, sizeof(BTCLeft)) BTC_MAP_ENTRY("Audio Right Channel", (long)&BTCRight, sizeof(BTCRight)) BTC_MAP_ENTRY("Audio Left Volume", (long)&BTCLeftVolume, sizeof(BTCLeftVolume)) BTC_MAP_ENTRY("Audio Right Volume", (long)&BTCRightVolume, sizeof(BTCRightVolume)) BTC_MAP_END

15 November 2015Veton Këpuska45 main.c (cont. 3) // // // Function:main // // // Description:After calling a few initalization routines, main() just // //waits in a loop forever. The code to process the incoming // //data can be placed in the function Process_Data() in the // //file "Process_Data.c". // // // void main(void) { sysreg_write(reg_SYSCFG, 0x32); //Initialize System Configuration Register Init_EBIU(); Init_Flash(); Init1836(); Init_Sport0(); Init_DMA(); Init_Sport_Interrupts(); Enable_DMA_Sport0(); btc_init(); while(1) { btc_poll(); }

15 November 2015Veton Këpuska46 Background Telemetry Channels (BTCs)  Background telemetry channels (BTCs) enable VisualDSP++ and a processor to exchange data via the JTAG interface while the processor is executing.  Before BTC, all communication between VisualDSP++ and a processor took place while the processor was in a halted state.  Note: Background telemetry channels are supported only in SHARC and Blackfin emulator sessions.

15 November 2015Veton Këpuska47 BTC Definitions in the Program  Background telemetry channels are defined on a per program (.DXE) basis. The channels are defined when a specific program is loaded onto a processor.  BTC channels are defined in a program by using simple macros. The following example code shows channel definitions. #include "btc.h“ BTC_MAP_BEGIN // Channel Name, Starting Address, Length (bytes) BTC_MAP_ENTRY("Audio Left Channel", (long)&BTCLeft, sizeof(BTCLeft)) BTC_MAP_ENTRY("Audio Right Channel", (long)&BTCRight, sizeof(BTCRight)) BTC_MAP_ENTRY("Audio Left Volume", (long)&BTCLeftVolume, sizeof(BTCLeftVolume)) BTC_MAP_ENTRY("Audio Right Volume", (long)&BTCRightVolume, sizeof(BTCRightVolume)) BTC_MAP_END  The first step in defining channels in a program is to include the BTC macros by using the #include btc.h statement.  Then each channel is defined with the macros. The definitions begin with BTC_MAP_BEGIN, which marks the beginning of the BTC map.  Next, each individual channel is defined with the BTC_MAP_ENTRY macro, which takes the parameters described in Table 2-17 in VisualDSP User’s Guide.

15 November 2015Veton Këpuska48 BTC_MAP_ENTRY Macro

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska50 External Bus Interface Unit (EBIU) Setup #include "Talkthrough.h" // // // Function:Init_EBIU // // // Description: This function initializes and enables asynchronous memory // //banks in External Bus Interface Unit so that Flash A can be // //accessed. // // // void Init_EBIU(void) { *pEBIU_AMBCTL0= 0x7bb07bb0; *pEBIU_AMBCTL1= 0x7bb07bb0; *pEBIU_AMGCTL= 0x000f; }

15 November 2015Veton Këpuska51 External Bus Interface Unit  The EBIU services requests for external memory from the Core or from a DMA channel.  The priority of the requests is determined by the External Bus Controller.  The address of the request determines whether the request is serviced by the EBIU SDRAM Controller or the EBIU Asynchronous Memory Controller.  The EBIU is clocked by the system clock (SCLK). All synchronous memories interfaced to the processor operate at the SCLK frequency.  The ratio between core frequency and SCLK frequency is programmable using a phase-locked loop (PLL) system memory-mapped register (MMR).

15 November 2015Veton Këpuska52 EBIU Programming Model  This programming model is based on system memory- mapped registers used to program the EBIU.  There are six control registers and one status register in the EBIU. They are: Asynchronous Memory Global Control register (EBIU_AMGCTL) Asynchronous Memory Bank Control 0 register (EBIU_AMBCTL0) Asynchronous Memory Bank Control 1 register (EBIU_AMBCTL1) SDRAM Memory Global Control register (EBIU_SDGCTL) SDRAM Memory Bank Control register (EBIU_SDBCTL) SDRAM Refresh Rate Control register (EBIU_SDRRC) SDRAM Control Status register (EBIU_SDSTAT)

15 November 2015Veton Këpuska53 The Asynchronous Memory Interface  The asynchronous memory interface allows interfaceing to a variety of memory and peripheral types. These include SRAM, ROM, EPROM, flash memory, and FPGA/ASIC designs.  Four asynchronous memory regions are supported. Each has a unique memory select associated with it, shown in Table 17-3.

15 November 2015Veton Këpuska54 Asynchronous Memory Bank Address Range

15 November 2015Veton Këpuska55 EBIU_AMGCTL Register  The Asynchronous Memory Global Control register (EBIU_AMGCTL) configures global aspects of the controller.  The EBIU_AMGCTL register should be the last control register written to when configuring the processor to access external memory-mapped asynchronous devices.

15 November 2015Veton Këpuska56 Initialization.c // // // Function:Init_EBIU // // // Parameters:None // // // Return:None // // // Description:This function initializes and enables the asynchronous // //memory banks for the External Bus Interface Unit (EBIU), so // //that access to Flash A is possible. // // // void Init_EBIU(void) { *pEBIU_AMBCTL0= 0x7bb07bb0; *pEBIU_AMBCTL1= 0x7bb07bb0; *pEBIU_AMGCTL= 0x000f; } Asynchronous Memory Global Control Register Asynchronous Memory Global Control Register

15 November 2015Veton Këpuska57 Asynchronous Memory Global Control Register EBIU_AMGCTL 0x000f =

15 November 2015Veton Këpuska58 Initialization.c // // // Function:Init_EBIU // // // Parameters:None // // // Return:None // // // Description:This function initializes and enables the asynchronous // //memory banks for the External Bus Interface Unit (EBIU), so // //that access to Flash A is possible. // // // void Init_EBIU(void) { *pEBIU_AMBCTL0= 0x7bb07bb0; *pEBIU_AMBCTL1= 0x7bb07bb0; *pEBIU_AMGCTL= 0x000f; } Asynchronous Memory Control Register Asynchronous Memory Control Register

15 November 2015Veton Këpuska59 EBIU_AMBCTL0 and EBIU_AMBCTL1 Registers  The EBIU asynchronous memory controller has two Asynchronous Memory Bank Control registers: EBIU_AMBCTL0 and EBIU_AMBCTL1.  They contain bits for counters for: setup, strobe, and hold time; bits to determine memory type and size; and bits to configure use of ARDY.

15 November 2015Veton Këpuska60 Asynchronous Memory Bank Control 0 Register 0x7bb07bb0 =

15 November 2015Veton Këpuska61 External Memory Map  The three SDRAM control registers must be initialized in order to use the MT48LC32M16 – 64 MB (32M x 16 bits) SDRAM memory of EZ-Kit Lite: EBIU_SDGCTL: SDRAM Memory Global Control register EBIU_SDBCTL: SDRAM Memory Bank Control register EBIU_SDRRC: SDRAM Refresh Rate Control register  The External Memory Map supported by BF533 is provided in the Figure 17-1.

15 November 2015Veton Këpuska62 EBIU_SDGCTL Register  The SDRAM Memory Global Control register (EBIU_SDGCTL) includes all programmable parameters associated with the SDRAM access timing and configuration. Figure shows the EBIU_SDGCTL register bit definitions.

15 November 2015Veton Këpuska63 SDRAM Memory Global Control register: EBIU_SDGCTL

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska65 Initialize.c // // // Function:Init_Flash // // // Description: This function initializes pin direction of Port A in Flash A // //to output. The AD1836_RESET on the ADSP-BF533 EZ-KIT board // //is connected to Port A. // // // void Init_Flash(void) { *pFlashA_PortA_Dir = 0x1; }

15 November 2015Veton Këpuska66 Initialize.c // // // Function:Init_Flash // // // Description: This function initializes pin direction of Port A in Flash A // //to output. The AD1836_RESET on the ADSP-BF533 EZ-KIT board // //is connected to Port A. // // // void Init_Flash(void) { *pFlashA_PortA_Dir = 0x1; } 0x1 = 0001 The Direction register controls IO pins direction. This is a 8-bit read-write register. When a bit is 0, a corresponding pin functions as an input. When the bit is 1, a corresponding pin is an output. See Slide #13 for details or EZ-Kit Lite HRM.Slide #13 The Direction register controls IO pins direction. This is a 8-bit read-write register. When a bit is 0, a corresponding pin functions as an input. When the bit is 1, a corresponding pin is an output. See Slide #13 for details or EZ-Kit Lite HRM.Slide #13 Direction Configuration

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADC SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska68 BF533 Interface with AD1871 Configuration & Control Data Transfer & Synch

15 November 2015Veton Këpuska69 Initialize.c // // // Function:Init1836() // // // Description: This function sets up the SPI port to configure the AD1836. // //The content of the array sCodec1836TxRegs is sent to the // //codec. // // // void Init1836(void) { int i; int j; static unsigned char ucActive_LED = 0x01; // write to Port A to reset AD1836 *pFlashA_PortA_Data = 0x00; // write to Port A to enable AD1836 *pFlashA_PortA_Data = ucActive_LED; // wait to recover from reset for (i=0; i<0xf000; i++); // Enable PF4 *pSPI_FLG = FLS4; // Set baud rate SCK = HCLK/(2*SPIBAUD) SCK = 2MHz *pSPI_BAUD = 16; // configure spi port // SPI DMA write, 16-bit data, MSB first, SPI Master *pSPI_CTL = TIMOD_DMA_TX | SIZE | MSTR; Reset AD1836 ADC & DAC Codec. Activate AD1836 Via PF4 pin Setting the Baud Rate of the SPI Interface with the Codec Setting the DMA transfer

15 November 2015Veton Këpuska70 Serial Peripheral Interface (SPI)  The processor has a Serial Peripheral Interface (SPI) port that provides an I/O interface to a wide variety of SPI compatible peripheral devices.  SPI is a four-wire interface consisting of two data pins (IN & OUT), a device select pin (SPISS), and a clock (CLK) pin.  SPI is a full-duplex synchronous serial interface, supporting master modes, slave modes, and multimaster environments.  The SPI compatible peripheral implementation also supports programmable baud rate and clock phase/polarities.

15 November 2015Veton Këpuska71 Serial Peripheral Interface (SPI)  Typical SPI compatible peripheral devices that can be used to interface to the SPI compatible interface include: Other CPUs or microcontrollers Codecs A/D converters D/A converters Sample rate converters SP/DIF or AES/EBU digital audio transmitters and receivers LCD displays Shift registers FPGAs with SPI emulation

15 November 2015Veton Këpuska72 Serial Peripheral Interface (SPI)  The SPI is an industry-standard synchronous serial link that supports communication with multiple SPI compatible devices. The SPI peripheral is a synchronous, four-wire interface consisting of two data pins:  Master Out Slave In (MOSI) and  Master In Slave Out (MISO) one device select pin  Serial Peripheral Interface Slave Select (SPISS) Input Signal, and a gated clock pin  Serial Peripheral Interface Clock (SCK) Signal.  With the two data pins, it allows for full-duplex operation to other SPI compatible devices.  The SPI also includes programmable baud rates, clock phase, and clock polarity.

15 November 2015Veton Këpuska73 Serial Peripheral Interface (SPI)  The SPI can operate in a multimaster environment by interfacing with several other devices, acting as either a master device or a slave device.  Figure 10-1 provides a block diagram of the SPI. The interface is essentially a shift register that serially transmits and receives data bits, one bit at a time at the SCK rate, to and from other SPI devices. SPI data is transmitted and received at the same time through the use of a shift register.  When an SPI transfer occurs, data is simultaneously transmitted (shifted serially out of the shift register) as new data is received (shifted serially into the other end of the same shift register).  The SCK synchronizes the shifting and sampling of the data on the two serial data pins.

15 November 2015Veton Këpuska74 SPI Block Diagram

SPI Interface Signals 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI SPI 5.SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska76 Serial Peripheral Interface Clock Signal (SCK)  The SCK signal is the SPI clock signal. This control signal is driven by the master and controls the rate at which data is transferred. The master may transmit data at a variety of baud rates. The SCK signal cycles once for each bit transmitted.  It is an output signal if the device is configured as a master, and an input signal if the device is configured as a slave.  The SCK is a gated clock that is active during data transfers only for the length of the transferred word. The number of active clock edges is equal to the number of bits driven on the data lines.  Slave devices ignore the serial clock if the Serial Peripheral Slave Select Input (SPISS’) is driven inactive (high).  The SCK is used to shift out and shift in the data driven on the MISO and MOSI lines. The data is always shifted out on active edges of the clock and sampled on inactive edges of the clock.  Clock polarity and clock phase relative to data are programmable in the SPI Control register (SPI_CTL) and define the transfer format.

15 November 2015Veton Këpuska77 Serial Peripheral Interface Slave Select Input Signal  The SPISS’ signal is the SPI Serial Peripheral Slave Select Input signal. This is an active-low signal used to enable a processor when it is configured as a slave device. This input-only pin behaves like a chip select and is provided by the master device for the slave devices. For a master device, it can act as an error signal input in case of the multimaster environment. In multimaster mode, if the SPISS input signal of a master is asserted (driven low), and the PSSE bit in the SPI_CTL register is enabled, an error has occurred. This means that another device is also trying to be the master device.  Note: The SPISS signal is the same pin as the PF0 pin.

15 November 2015Veton Këpuska78 Master Out Slave In (MOSI) & Master In Slave Out (MISO)  Master Out Slave In (MOSI) The MOSI pin is the Master Out Slave In pin, one of the bidirectional I/O data pins.  If the processor is configured as a master, the MOSI pin becomes a data transmit (output) pin, transmitting output data.  If the processor is configured as a slave, the MOSI pin becomes a data receive (input) pin, receiving input data. In an SPI interconnection, the data is shifted out from the MOSI output pin of the master and shifted into the MOSI input(s) of the slave(s).  Master In Slave Out (MISO) The MISO pin is the Master In Slave Out pin, one of the bidirectional I/O data pins.  If the processor is configured as a master, the MISO pin becomes a data receive (input) pin, receiving input data.  If the processor is configured as a slave, the MISO pin becomes a data transmit (output) pin,

15 November 2015Veton Këpuska79 BF533 Interface with AD1871 Configuration & Control Data Transfer & Synch

15 November 2015Veton Këpuska80 ADSP-BF533 as Slave SPI Device

15 November 2015Veton Këpuska81 Interrupt Output  The SPI has two interrupt output signals: a data interrupt and an error interrupt

15 November 2015Veton Këpuska82 SPI Data Interrupt Output  The behavior of the SPI data interrupt signal depends on the Transfer Initiation Mode bit field (TIMOD) in the SPI Control register (discussed next). In DMA mode (TIMOD = 1X), the data interrupt acts as a DMA request and is generated when the DMA FIFO is ready to be  written to (TIMOD = 11) or  read from (TIMOD = 10). In non-DMA mode (TIMOD = 0X), a data interrupt is generated  when the SPI_TDBR is ready to be written to (TIMOD = 01) or  when the SPI_RDBR is ready to be read from (TIMOD = 00).

15 November 2015Veton Këpuska83 SPI Error Interrupt Output  An SPI Error interrupt is generated in a master when a Mode Fault Error occurs, in both DMA and non-DMA modes.  An error interrupt can also be generated in DMA mode when there is an underflow (TXE when TIMOD = 11) or an overflow (RBSY when TIMOD = 10) error condition.  In non-DMA mode, the underflow and overflow conditions set the TXE and RBSY bits in the SPI_STAT register, respectively, but do not generate an error interrupt.

15 November 2015Veton Këpuska84 SPI Registers  The SPI peripheral includes a number of user-accessible registers. Some of these registers are also accessible through the DMA bus.  Four registers contain control and status information: SPI_BAUD, SPI_CTL, SPI_FLG, and SPI_STAT.  Two registers are used for buffering receive and transmit data: SPI_RDBR and SPI_TDBR  For information about DMA-related registers, see Chapter 9 of ADSP-BF533 Blackfin Processor Hardware Reference, “Direct Memory Access.” also discussed next.  The shift register, SFDR, is internal to the SPI module and is not directly accessible.

15 November 2015Veton Këpuska85 SPI Registers: SPI_BAUD Register  The SPI Baud Rate register (SPI_BAUD) is used to set the bit transfer rate for a master device. When configured as a slave, the value written to this register is ignored.  The serial clock frequency is determined by this formula: SCK Frequency = (Peripheral clock frequency SCLK)/(2 x SPI_BAUD) SCK – Clock Divide Factor SPI_BAUD = 16 & assuming SCLK = 100 MHz ⇒ SCK = 100 MHz/32 = 3125 kHz.

15 November 2015Veton Këpuska86 SPI_BAUD Register

15 November 2015Veton Këpuska87 SCLK & CCLK  Read “PLL Clock Multiplier Ratios” section of chapter 8 “Dynamic Power Management” of “ADSP-BF533 Blackfin Processor Hardware Reference” manual.  Brief summary of the clock sources and clock rates:  The clock source on EZ Kit is 270 MHz oscillator.  The default SCLK is 54 MHz.  The SCLK value can be calculated from the PLL_CTL and PLL_DIV register values. By default the PLL_CTL = 0x1400, here the MSEL = 10, so the VCO frequency is 10x27 = 270 MHz.  By default the PLL_DIV = 0x0005, here CSEL = 0 and SSEL = 5, so CCLK = 270/1 = 270 MHz and SCLK = 270/5 = 54 MHz.

15 November 2015Veton Këpuska88 Note on SPORT Clock division and frame sync  The clock division parameters are located in the SPORTx_TCLKDIV and SPORTx_RCLKDIV registers.  To specify a clock frequency for the SPORT, use the following equation:  Where: f(sclk) is the frequency of the core (54 Mhz default on the EZ-KIT LITE), SPORTx_yCLK (y is T - for transmit, R – for receive) frequency is the specified clock frequency of the SPORT, and SPORTx_yCLKDIV is the value needed to be input into the specified transmit/receive clock division register.  Frame sync parameters are the number of serial clock cycles before a frame sync is generated. This value must not be less than the serial word length (SLEN), otherwise corrupt data will be received.  # of serial clock cycles between frame syncs = SPORTx_yFSDIV + 1  For example, if one wanted a serial clock frequency of 375 kHz, and 32 bit words were used, then SPORTx_yCLKDIV = 54MHz/(2*375kHz) - 1 = = 71 = 0x0048 SPORTx_yFSDIV = = 31 = 0x001f

15 November 2015Veton Këpuska89 SPI_CTL Register  The SPI Control register (SPI_CTL) is used to configure and enable the SPI system. This register is used to  enable the SPI interface,  select the device as a master or slave, and  determine the data transfer format and word size.

15 November 2015Veton Këpuska90 SPI_CTL Register Details  The term “word” refers to a single data transfer of either 8 bits or 16 bits, depending on the word length (SIZE) bit in SPI_CTL.  There are two special bits which can also be modified by the hardware: SPE and MSTR.  The TIMOD field is used to specify the action that initiates transfers to/from the receive/transmit buffers. When set to 00, a SPI port transaction is begun when the receive buffer is read. Data from the first read will need to be discarded since the read is needed to initiate the first SPI port transaction. When set to 01, the transaction is initiated when the transmit buffer is written. A value of 10 selects DMA Receive Mode and the first transaction is initiated by enabling the SPI for DMA Receive mode. Subsequent individual transactions are initiated by a DMA read of the SPI_RDBR. A value of 11 selects DMA Transmit Mode and the transaction is initiated by a DMA write of the SPI_TDBR.

15 November 2015Veton Këpuska91 SPI_CTL Register Details  The PSSE bit is used to enable the SPISS input for master. When not used, SPISS can be disabled, freeing up a chip pin as general-purpose I/O.  The EMISO bit enables the MISO pin as an output. This is needed in an environment where the master wishes to transmit to various slaves at one time (broadcast). Only one slave is allowed to transmit data back to the master. Except for the slave from whom the master wishes to receive, all other slaves should have this bit cleared.  The SPE and MSTR bits can be modified by hardware when the MODF bit of the Status register is set. See “Mode Fault Error” on page of ADSP-BF533 Blackfin Processor Hardware Reference manual.

15 November 2015Veton Këpuska92 SPI_CTL Register Details *pSPI_CTL = TIMOD_DMA_TX | SIZE | MSTR TIMOD_DMA_TX 0x0003 = SIZE = MSTR =

15 November 2015Veton Këpuska93 Summary of SPI Register Functions

BF533 Direct Memory Access - DMA BF533 DMA Support

15 November 2015Veton Këpuska95 ADSP-BF533 Ez-Kit Lite Audio Interface SPI SPORT0 EBIU

15 November 2015Veton Këpuska96 Processor Memory Architecture DMA Controller EBIU DMA Peripherals Core Processor L1 Memory

15 November 2015Veton Këpuska97 BF533 DMA Support  The processor has multiple, independent DMA controllers that support automated data transfers with minimal overhead for the core.  DMA transfers can occur between the internal memories and any of its DMA-capable peripherals. Additionally, DMA transfers can be accomplished between any of the DMA-capable peripherals and external devices connected to the external memory interfaces, including the SDRAM controller and the asynchronous memory controller. DMA- capable peripherals include the  SPORTs,  SPI port,  UART, and  PPI.  Each individual DMA-capable peripheral has at least one dedicated DMA channel.

15 November 2015Veton Këpuska98 BF533 DMA Support  The DMA controller supports both one-dimensional (1D) and two-dimensional (2D) DMA transfers.  DMA transfer initialization can be implemented from registers or from sets of parameters called descriptor blocks.  The 2D DMA capability supports arbitrary row and column sizes up to 64K elements by 64K elements, and arbitrary row and column step sizes up to +/- 32K elements. Furthermore, the column step size can be less than the row step size, allowing implementation of interleaved datastreams. This feature is especially useful in video applications where data can be de-interleaved on the fly.

15 November 2015Veton Këpuska99 Generic Names of the DMA Memory-Mapped Registers

15 November 2015Veton Këpuska100 DMA Channel Map

15 November 2015Veton Këpuska101 DMA Channel Map

ADI1836 SPI DMA Configuration 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI DMA 5.SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska103 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska104 DMA Channel’s Peripheral Map Register  Each DMA channel’s Peripheral Map register (DMAx_PERIPHERAL_MAP) contains bits that: Map the channel to a specific peripheral. Identify whether the channel is a Peripheral DMA channel or a Memory DMA channel. *pDMA5_PERIPHERAL_MAP= 0x5000;

15 November 2015Veton Këpuska105 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska106 DMA Configuration Register  The DMA Configuration register (DMAx_CONFIG/MDMA_yy_CONFIG), shown in Figure 9-3 of ADSP-BF533 Blackfin Processor Hardware Reference, also in this slide is used to set up DMA parameters and operating modes. *pDMA5_CONFIG= = 0x0004;

15 November 2015Veton Këpuska107 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska108 main.c (cont 1) // array for registers to configure the ad1836 names are defined in "Talkthrough.h" volatile short sCodec1836TxRegs[CODEC_1836_REGS_LENGTH] = { DAC_CONTROL_1| 0x000, DAC_CONTROL_2| 0x000, DAC_VOLUME_0| 0x3ff, DAC_VOLUME_1| 0x3ff, DAC_VOLUME_2| 0x3ff, DAC_VOLUME_3| 0x3ff, DAC_VOLUME_4| 0x3ff, DAC_VOLUME_5| 0x3ff, ADC_CONTROL_1| 0x000, ADC_CONTROL_2| 0x180, ADC_CONTROL_3| 0x000 }; #define DAC_CONTROL_10x0000 | 0x000 = 0x0000 #define DAC_CONTROL_20x1000 | 0x000 = 0x1000 #define DAC_VOLUME_00x2000 | 0x3ff = 0x23ff #define DAC_VOLUME_10x3000 | 0x3ff = 0x33ff #define DAC_VOLUME_20x4000 | 0x3ff = 0x43ff #define DAC_VOLUME_30x5000 | 0x3ff = 0x53ff #define DAC_VOLUME_40x6000 | 0x3ff = 0x63ff #define DAC_VOLUME_50x7000 | 0x3ff = 0x73ff #define ADC_CONTROL_10xC000 | 0x000 = 0xC000 #define ADC_CONTROL_20xD000 | 0x180 = 0xD180 #define ADC_CONTROL_30xE000 | 0x000 = 0xE000

15 November 2015Veton Këpuska109 DMA Start Address Register  The Start Address register (DMAx_START_ADDR/MDMA_yy_START_ADDR), shown in Figure 9-2 of ADSP-BF533 Blackfin Processor Hardware Reference, also in the next slide, contains the start address of the data buffer currently targeted for DMA.

15 November 2015Veton Këpuska110 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska111 DMA Count Register  For 1D DMA, it specifies the number of elements to read in. For 2D DMA details, see “Two-Dimensional DMA” on page 9-45 of ADSP-BF533 Blackfin Processor Hardware Reference. A value of 0 in X_COUNT corresponds to 65,536 elements.

15 November 2015Veton Këpuska112 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska113 DMAx Modify Register  The Inner Loop Address Increment register (DMAx_X_MODIFY/MDMA_yy_X_MODIFY) contains a signed, two’s-complement byte-address increment. In 1D DMA, this increment is the stride that is applied after transferring each element.  Note X_MODIFY is specified in bytes, regardless of the DMA transfer size.

15 November 2015Veton Këpuska114 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska115 DMA Configuration Register *pDMA5_CONFIG = WDSIZE_16; WDSIZE_16 = 0x0004; *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); DMAEN = 0x0001 *pDMA5_CONFIG = 0x0005 *pDMA5_CONFIG = WDSIZE_16; WDSIZE_16 = 0x0004; *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); DMAEN = 0x0001 *pDMA5_CONFIG = 0x0005

15 November 2015Veton Këpuska116 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

15 November 2015Veton Këpuska117 SPI_CTL Register Details *pSPI_CTL = TIMOD_DMA_TX | SIZE | MSTR TIMOD_DMA_TX 0x0003 = *pSPI_CTL = *pSPI_CTL | SPE SPE 0x4000 =

15 November 2015Veton Këpuska118 Initialize.c: Init1836() // Set up DMA5 to transmit // Map DMA5 to SPI *pDMA5_PERIPHERAL_MAP= 0x5000; // Configure DMA5 // 16-bit transfers *pDMA5_CONFIG = WDSIZE_16; // Start address of data buffer *pDMA5_START_ADDR = sCodec1836TxRegs; // DMA inner loop count *pDMA5_X_COUNT = CODEC_1836_REGS_LENGTH; // Inner loop address increment *pDMA5_X_MODIFY = 2; // enable DMAs *pDMA5_CONFIG = (*pDMA5_CONFIG | DMAEN); // enable spi *pSPI_CTL = (*pSPI_CTL | SPE); // wait until dma transfers for spi are finished for (j=0; j<0xaff; j++); // disable spi *pSPI_CTL = 0x0000; }

Serial Port Controllers: SPORT 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI DMA 5.SPORT0 6.DMA configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

15 November 2015Veton Këpuska120 ADSP-BF533 Ez-Kit Lite Audio Interface SPI SPORT0 EBIU

15 November 2015Veton Këpuska121 Serial Port Controllers (SPORT)  The processor has two identical synchronous serial ports, or SPORTs. These support a variety of serial data communications protocols and can provide a direct interconnection between processors in a multiprocessor system.  The serial ports (SPORT0 and SPORT1) provide an I/O interface to a wide variety of peripheral serial devices. SPORTs provide synchronous serial data transfer only; The processor provides asynchronous RS-232 data transfer via the UART.  Each SPORT has one group of pins: primary data, secondary data, clock, and frame sync for transmit and a second set of pins for receive.  The receive and transmit functions are programmed separately.  Each SPORT is a full duplex device, capable of simultaneous data transfer in both directions. The SPORTs can be programmed by writing to memory-mapped registers for bit rate, frame sync, and number of bits per word

15 November 2015Veton Këpuska122 SPORT (cont.)  Both SPORTs have the same capabilities and are programmed in the same way.  Each SPORT has its own set of control registers and data buffers.  The SPORTs use frame sync pulses to indicate the beginning of each word or packet, and the bit clock marks the beginning of each data bit.  External bit clock and frame sync are available for the TX and RX buffers.

15 November 2015Veton Këpuska123 SPORT (cont.)  With a range of clock and frame synchronization options, the SPORTs allow a variety of serial communication protocols.  The SPORTs can operate at up to an SCLK/2 clock rate with an externally generated clock, or 1/2 the system clock rate for an internally generated serial port clock.  The SPORT external clock must always be less than the SCLK frequency. Independent transmit and receive clocks provide greater flexibility for serial communications.  SPORT clocks and frame syncs can be internally generated by the system or received from an external source.  The SPORTs can operate with a transmission format of LSB first or MSB first, with word lengths selectable from 3 to 32 bits.  They offer selectable transmit modes and optional μ-law or A-law companding in hardware. SPORT data can be automatically transferred between on-chip and off-chip memories using DMA block transfers.  Additionally, each of the SPORTs offers a TDM (Time-Division-Multiplexed) Multichannel mode.

15 November 2015Veton Këpuska124 SPORT Features for Audio Exercise  Provides Direct Memory Access transfer to and from memory under DMA Master control.  DMA can be autobuffer-based (a repeated, identical range of transfers) or descriptor-based (individual or repeated ranges of transfers with differing DMA parameters).  Executes DMA transfers to and from on-chip memory. Each SPORT can automatically receive and transmit an entire block of data.  Permits chaining of DMA operations for multiple data blocks.

15 November 2015Veton Këpuska125 SPORT Pins

15 November 2015Veton Këpuska126 SPORT A SPORT Receives serial data on its DRxPRI and DRxSEC inputs and Transmits serial data on its DTxPRI and DTxSEC outputs. It can receive and transmit simultaneously for full-duplex operation. A SPORT Receives serial data on its DRxPRI and DRxSEC inputs and Transmits serial data on its DTxPRI and DTxSEC outputs. It can receive and transmit simultaneously for full-duplex operation. For transmit: The data bits (DTxPRI and DTxSEC) are synchronous to the transmit clock (TSCLKx). For receive: The data bits (DRxPRI and DRxSEC) are synchronous to the receive clock (RSCLKx). The serial clock is an output if the processor generates it, or an input if the clock is externally generated. Frame synchronization signals RFSx and TFSx are used to indicate the start of a serial data word or stream of serial words. For transmit: The data bits (DTxPRI and DTxSEC) are synchronous to the transmit clock (TSCLKx). For receive: The data bits (DRxPRI and DRxSEC) are synchronous to the receive clock (RSCLKx). The serial clock is an output if the processor generates it, or an input if the clock is externally generated. Frame synchronization signals RFSx and TFSx are used to indicate the start of a serial data word or stream of serial words. Data to be transmitted is written from an internal processor register to the SPORT’s SPORTx_TX register via the peripheral bus. This data is optionally compressed by the hardware and automatically transferred to the TX Shift register. The bits in the Shift register are shifted out on the SPORT’s DTxPRI/DTxSEC pin, MSB first or LSB first, Synchronous to the serial clock on the TSCLKx pin. Data to be transmitted is written from an internal processor register to the SPORT’s SPORTx_TX register via the peripheral bus. This data is optionally compressed by the hardware and automatically transferred to the TX Shift register. The bits in the Shift register are shifted out on the SPORT’s DTxPRI/DTxSEC pin, MSB first or LSB first, Synchronous to the serial clock on the TSCLKx pin. The receive portion of the SPORT accepts data from the DRxPRI/DRxSEC pin synchronous to the serial clock on the RSCLKx pin. When an entire word is received, the data is optionally expanded, then automatically transferred to the SPORT’s SPORTx_RX register, and then into the RX FIFO where it is available to the processor. The receive portion of the SPORT accepts data from the DRxPRI/DRxSEC pin synchronous to the serial clock on the RSCLKx pin. When an entire word is received, the data is optionally expanded, then automatically transferred to the SPORT’s SPORTx_RX register, and then into the RX FIFO where it is available to the processor.

15 November 2015Veton Këpuska127 SPORT Generic Operation  Writing to a SPORT’s SPORTx_TX register readies the SPORT for transmission. The TFS signal initiates the transmission of serial data. Once transmission has begun, each value written to the SPORTx_TX register is transferred through the FIFO to the internal Transmit Shift register. The bits are then sent, beginning with either the MSB or the LSB as specified in the SPORTx_TCR1 register. Each bit is shifted out on the driving edge of TSCLKx. The driving edge of TSCLKx can be configured to be rising or falling.  The SPORT generates the transmit interrupt or requests a DMA transfer as long as there is space in the TX FIFO.  As a SPORT receives bits, they accumulate in an internal receive register. When a complete word has been received, it is written to the SPORT FIFO register and the receive interrupt for that SPORT is generated or A DMA transfer is initiated. Interrupts are generated differently if DMA block transfers are performed. For information about DMA, see Chapter 9, “Direct Memory Access.”

15 November 2015Veton Këpuska128 Generic Multichannel SPORT Connectivity

15 November 2015Veton Këpuska129 AD1836 and SPORT

15 November 2015Veton Këpuska130 Initialize.c : Init_Sport0 // // // Function:Init_Sport0 // // // Description: Configure Sport0 for TDM mode, to transmit/receive data // //to/from the AD1836. Configure Sport for external clocks and // //frame syncs. // // // void Init_Sport0(void) { // Sport0 receive configuration // External CLK, External Frame sync, MSB first // 32-bit data *pSPORT0_RCR1 = RFSR; *pSPORT0_RCR2 = SLEN_32; // Sport0 transmit configuration // External CLK, External Frame sync, MSB first // 24-bit data *pSPORT0_TCR1 = TFSR; *pSPORT0_TCR2 = SLEN_32; // Enable MCM 8 transmit & receive channels *pSPORT0_MTCS0 = 0x000000FF; *pSPORT0_MRCS0 = 0x000000FF; // Set MCM configuration register and enable MCM mode *pSPORT0_MCMC1 = 0x0000; *pSPORT0_MCMC2 = 0x101c; }

15 November 2015Veton Këpuska131 Setting SPORT Modes  SPORT configuration is accomplished by setting bit and field values in configuration registers. Each SPORT must be configured prior to being enabled. Once the SPORT is enabled, further writes to the SPORT Configuration registers are disabled (except for SPORTx_RCLKDIV, SPORTx_TCLKDIV, and Multichannel Mode Channel Select registers). To change values in all other SPORT Configuration registers, disable the SPORT by clearing TSPEN in SPORTx_TCR1 and/or RSPEN in SPORTx_RCR1.  Each SPORT has its own set of control registers and data buffers. These registers are described in detail in the following sections as they relate to audio LAB’s.  All control and status bits in the SPORT registers are active high unless otherwise noted.

15 November 2015Veton Këpuska132 SPORTx_RCR1 and SPORTx_RCR2 Registers  The main control registers for the receive portion of each SPORT are the Receive Configuration registers: SPORTx_RCR1 and SPORTx_RCR2.  A SPORT is enabled for receive if Bit 0 (RSPEN) of the Receive Configuration 1 register is set to 1. This bit is cleared during either a hard reset or a soft reset, disabling all SPORT reception.  When the SPORT is enabled to receive (RSPEN bit is set), corresponding SPORT Configuration register writes are not allowed except for SPORTx_RCLKDIV and Multichannel Mode Channel Select registers. Writes to disallowed registers have no effect. While the SPORT is enabled, SPORTx_RCR1 is not written except for bit 0 (RSPEN). For example: write (SPORTx_RCR1, 0x0001) ; /* SPORT RX Enabled */ write (SPORTx_RCR1, 0xFF01) ; /* ignored, no effect */ write (SPORTx_RCR1, 0xFFF0) ; /* SPORT disabled, SPORTx_RCR1 still equal to 0x0000 */

15 November 2015Veton Këpuska133 SPORTx Receive Configuration 1 Register *pSPORT0_RCR1 = RFSR; RFSR = 0x0000 or 0x0400; *pSPORT0_RCR1 = RFSR; RFSR = 0x0000 or 0x0400;

15 November 2015Veton Këpuska134 SPORTx Receive Configuration 2 Register *pSPORT0_RCR2 = SLEN_32 SLEN_32 = 0x001f;

15 November 2015Veton Këpuska135 SPORTx_RCR1 and SPORTx_RCR2 Registers  Additional information for the SPORTx_RCR1 and SPORTxRCR2 Receive Configuration register bits: Receive Enable (RSPEN). This bit selects whether the SPORT is  enabled to receive (if set) or  disabled (if cleared). Setting the RSPEN bit turns on the SPORT and  causes it to sample data from the data receive pins as well as  the receive bit clock and  Receive Frame Sync pins if so programmed.  Setting RSPEN enables the SPORTx receiver, which can generate a SPORTx RX interrupt. For this reason, the code should initialize the ISR and the DMA control registers first, and should be ready to service RX interrupts before setting RSPEN. Setting RSPEN also generates DMA requests if DMA is enabled and data is received.  Set all DMA control registers before setting RSPEN.

15 November 2015Veton Këpuska136 SPORTx_RCR1 and SPORTx_RCR2 Registers  Clearing RSPEN causes the SPORT to stop receiving data; it also shuts down the internal SPORT receive circuitry. In low power applications, battery life can be extended by clearing RSPEN whenever the SPORT is not in use.  Internal Receive Clock Select. (IRCLK). This bit selects the internal receive clock (if set) or external receive clock (if cleared). The RCLKDIV MMR value is not used when an external clock is selected.  Data Formatting Type Select. (RDTYPE). The two RDTYPE bits specify one of four data formats used for single and multichannel operation.  Bit Order Select. (RLSBIT). The RLSBIT bit selects the bit order of the data words received over the SPORTs.

15 November 2015Veton Këpuska137 SPORTx_RCR1 and SPORTx_RCR2 Registers  Serial Word Length Select. (SLEN). The serial word length (the number of bits in each word received over the SPORTs) is calculated by adding 1 to the value of the SLEN field. The SLEN field can be set to a value of 2 to 31; 0 and 1 are illegal values for this field.  Internal Receive Frame Sync Select. (IRFS). This bit selects whether the SPORT uses an internal RFS (if set) or an external RFS (if cleared).  Receive Frame Sync Required Select. (RFSR). This bit selects whether the SPORT requires (if set) or does not require (if cleared) a Receive Frame Sync for every data word.  Low Receive Frame Sync Select. (LRFS). This bit selects an active low RFS (if set) or active high RFS (if cleared).  Late Receive Frame Sync. (LARFS). This bit configures late frame syncs (if set) or early frame syncs (if cleared).

15 November 2015Veton Këpuska138 SPORTx_RCR1 and SPORTx_RCR2 Registers  Clock Drive/Sample Edge Select. (RCKFE). This bit selects which edge of the RSCLK clock signal the SPORT uses for sampling data, for sampling externally generated frame syncs, and for driving internally generated frame syncs. If set, internally generated frame syncs are driven on the falling edge, and data and externally generated frame syncs are sampled on the rising edge. If cleared, internally generated frame syncs are driven on the rising edge, and data and externally generated frame syncs are sampled on the falling edge.  RxSec Enable. (RXSE). This bit enables the receive secondary side of the serial port (if set).  Stereo Serial Enable. (RSFSE). This bit enables the Stereo Serial operating mode of the serial port (if set). By default this bit is cleared, enabling normal clocking and frame sync.  Left/Right Order. (RRFST). If this bit is set, the right channel is received first in Stereo Serial operating mode. By default this bit is cleared, and the left channel is received first.

15 November 2015Veton Këpuska139 SPORTx_TCR1 and SPORTx_TCR2 Registers  The main control registers for the transmit portion of each SPORT are the Transmit Configuration registers, SPORTx_TCR1 and SPORTx_TCR2.  A SPORT is enabled for transmit if Bit 0 (TSPEN) of the Transmit Configuration 1 register is set to 1.  This bit is cleared during either a hard reset or a soft reset, disabling all SPORT transmission.  When the SPORT is enabled to transmit (TSPEN set), corresponding SPORT Configuration register writes are not allowed except for SPORTx_TCLKDIV and Multichannel Mode Channel Select registers. Writes to disallowed registers have no effect. While the SPORT is enabled, SPORTx_TCR1 is not written except for bit 0 (TSPEN). For example: write (SPORTx_TCR1, 0x0001) ; /* SPORT TX Enabled */ write (SPORTx_TCR1, 0xFF01) ; /* ignored, no effect */ write (SPORTx_TCR1, 0xFFF0) ; /* SPORT disabled, SPORTx_TCR1 still equal to 0x0000 */

15 November 2015Veton Këpuska140 SPORTX Transmit Configuration 1 Register: SPORTx_TCR1 *pSPORT0_TCR1 = TFSR; TFSR = 0x0000 or 0x0400; *pSPORT0_TCR1 = TFSR; TFSR = 0x0000 or 0x0400;

15 November 2015Veton Këpuska141 SPORTX Transmit Configuration 2 Register: SPORTx_TCR2 *pSPORT0_TCR2 = SLEN_32; SLEN_32 = 0x001f;

15 November 2015Veton Këpuska142 SPORTx_TCR1 and SPORTx_TCR2 Registers  Additional information for the SPORTx_TCR1 and SPORTx_TCR2 Transmit Configuration register bits includes:  Transmit Enable (TSPEN). This bit selects whether the SPORT is enabled to transmit (if set) or disabled (if cleared). Setting TSPEN causes an immediate assertion of a SPORT TX interrupt, indicating that the TX data register is empty and needs to be filled. This is normally desirable because it allows centralization of the transmit data write code in the TX interrupt service routine (ISR). For this reason, the code should initialize the ISR and be ready to service TX interrupts before setting TSPEN. Similarly, if DMA transfers will be used, DMA control should be configured correctly before setting TSPEN. Set all DMA control registers before setting TSPEN. Clearing TSPEN causes the SPORT to stop driving data, TSCLK, and frame sync pins; it also shuts down the internal SPORT circuitry. In low power applications, battery life can be extended by clearing TSPEN whenever the SPORT is not in use.  All SPORT control registers should be programmed before TSPEN is set. Typical SPORT initialization code first writes all control registers, including DMA control if applicable. The last step in the code is to write SPORTx_TCR1 with all of the necessary bits, including TSPEN.

15 November 2015Veton Këpuska143 SPORTx_TCR1 and SPORTx_TCR2 Registers  Internal Transmit Clock Select. (ITCLK). This bit selects the internal transmit clock (if set) or the external transmit clock on the TSCLK pin (if cleared). The TCLKDIV MMR value is not used when an external clock is selected.  Data Formatting Type Select. The two TDTYPE bits specify data formats used for single and multichannel operation.  Bit Order Select. (TLSBIT). The TLSBIT bit selects the bit order of the data words transmitted over the SPORT.  Serial Word Length Select. (SLEN). The serial word length (the number of bits in each word transmitted over the SPORTs) is calculated by adding 1 to the value of the SLEN field: Serial Word Length = SLEN + 1;  The SLEN field can be set to a value of 2 to 31; 0 and 1 are illegal values for this field. Three common settings for the SLEN field are 15, to transmit a full 16-bit word; 7, to transmit an 8-bit byte; and 23, to transmit a 24-bit word. The processor can load 16- or 32-bit values into the transmit buffer via DMA or an MMR write instruction; the SLEN field tells the SPORT how many of those bits to shift out of the register over the serial link. The serial port transfers bits [SLEN:0] from the transmit buffer.

15 November 2015Veton Këpuska144 SPORTx_TCR1 and SPORTx_TCR2 Registers  Internal Transmit Frame Sync Select. (ITFS). This bit selects whether the SPORT uses an internal TFS (if set) or an external TFS (if cleared).  Transmit Frame Sync Required Select. (TFSR). This bit selects whether the SPORT requires (if set) or does not require (if cleared) a Transmit Frame Sync for every data word.  Data-Independent Transmit Frame Sync Select. (DITFS). This bit selects whether the SPORT generates a data-independent TFS (sync at selected interval) or a data-dependent TFS (sync when data is present in SPORTx_TX) for the case of internal frame sync select (ITFS = 1). The DITFS bit is ignored when external frame syncs are selected. The frame sync pulse marks the beginning of the data word. If DITFS is set, the frame sync pulse is issued on time, whether the SPORTx_TX register has been loaded or not; if DITFS is cleared, the frame sync pulse is only generated if the SPORTx_TX data register has been loaded. If the receiver demands regular frame sync pulses, DITFS should be set, and the processor should keep loading the SPORTx_TX register on time. If the receiver can tolerate occasional late frame sync pulses, DITFS should be cleared to prevent the SPORT from transmitting old data twice or transmitting garbled data if the processor is late in loading the SPORTx_TX register.

15 November 2015Veton Këpuska145 SPORTx_TCR1 and SPORTx_TCR2 Registers  Low Transmit Frame Sync Select. (LTFS). This bit selects an active low TFS (if set) or active high TFS (if cleared).  Late Transmit Frame Sync. (LATFS). This bit configures late frame syncs (if set) or early frame syncs (if cleared).  Clock Drive/Sample Edge Select. (TCKFE). This bit selects which edge of the TCLKx signal the SPORT uses for driving data, for driving internally generated frame syncs, and for sampling externally generated frame syncs. If set, data and internally generated frame syncs are driven on the falling edge, and externally generated frame syncs are sample on the rising edge. If cleared, data and internally generated frame syncs are driven on the rising edge, and externally generated frame syncs are sampled on the falling edge.  TxSec Enable. (TXSE). This bit enables the transmit secondary side of the serial port (if set).  Stereo Serial Enable. (TSFSE). This bit enables the Stereo Serial operating mode of the serial port (if set). By default this bit is cleared, enabling normal clocking and frame sync.  Left/Right Order. (TRFST). If this bit is set, the right channel is transmitted first in Stereo Serial operating mode. By default this bit is cleared, and the left channel is transmitted first.

15 November 2015Veton Këpuska146 Data Word Formats  The format of the data words transferred over the SPORTs is configured by the combination of: transmit SLEN and receive SLEN; RDTYPE; TDTYPE; RLSBIT; and TLSBIT bits of the  SPORTx_TCR1,  SPORTx_TCR2,  SPORTx_RCR1, and  SPORTx_RCR2 registers.

15 November 2015Veton Këpuska147 SPORTs Multichannel Operation  In Multichannel mode, RSCLK can either be provided externally or generated internally by the SPORT, and it is used for both transmit and receive functions. Leave TSCLK disconnected if the SPORT is used only in multichannel mode.  If RSCLK is externally or internally provided, it will be internally distributed to both the receiver and transmitter circuitry.

15 November 2015Veton Këpuska148 SPORTs Multichannel Operation  Important Note:  The SPORT Multichannel Transmit Select register and the SPORT Multichannel Receive Select register must be programmed before enabling SPORTx_TX or SPORTx_RX operation for Multichannel Mode. This is especially important in “DMA data unpacked mode,” since SPORT FIFO operation begins immediately after RSPEN and TSPEN are set, enabling both RX and TX. The MCMEN bit (in SPORTx_MCMC2) must be enabled prior to enabling SPORTx_TX or SPORTx_RX operation. When disabling the SPORT from multichannel operation, first disable TXEN and then disable RXEN. Note both TXEN and RXEN must be disabled before reenabling. Disabling only TX or RX is not allowed.

15 November 2015Veton Këpuska149 SPORTs Multichannel Operation  SPORTx_MTCSn Registers  The Multichannel Selection registers are used to enable and disable individual channels. The four SPORTx Multichannel Transmit Select registers (SPORTx_MTCSn) specify the active transmit channels.  There are four registers, each with 32 bits, corresponding to the 128 channels: Setting a bit enables that channel so that the serial port selects that word for transmit from the multiple word block of data. For example, setting bit 0 selects word 0, setting bit 12 selects word 12, and so on.

15 November 2015Veton Këpuska150 SPORTs Multichannel Operation  Setting a particular bit in a SPORTx_MTCSn register causes the serial port to transmit the word in that channel’s position of the datastream. Clearing the bit in the SPORTx_MTCSn register causes the serial port’s data transmit pin to three- state during the time slot of that channel.

15 November 2015Veton Këpuska151 SPORTs Multichannel Operation  SPORTx_MRCSn Registers  The Multichannel Selection registers are used to enable and disable individual channels. The SPORTx Multichannel Receive Select registers (SPORTx_MRCSn) specify the active receive channels.  There are four registers, each with 32 bits, corresponding to the 128 channels. Setting a bit enables that channel so that the serial port selects that word for receive from the multiple word block of data. For example, setting bit 0 selects word 0, setting bit 12 selects word 12, and so on.

15 November 2015Veton Këpuska152 SPORTx Multichannel Transmit Select Registers *pSPORT0_MTCS0 = 0x000000FF;

15 November 2015Veton Këpuska153 SPORTx Multichannel Receive Select Registers *pSPORT0_MRCS0 = 0x000000FF;

15 November 2015Veton Këpuska154 SPORTx_MCMCn Registers  SPORTx_MCMCn Registers  There are two SPORTx Multichannel Configuration registers (SPORTx_MCMCn) for each SPORT.  The SPORTx_MCMCn registers are used to configure the multichannel operation of the SPORT. The two control registers are shown below.

15 November 2015Veton Këpuska155 SPORTx_MCMCn Registers *pSPORT0_MCMC1 = 0x0000; Desired Window Size = 8

15 November 2015Veton Këpuska156 SPORTx_MCMCn Registers *pSPORT0_MCMC2 = 0x101c; 0x101c =

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI DMA 5.SPORT0 6.DMA Configuration 7.SPORT IRS 8.DMA Support 9.Endless loop and processing Flag Interrupts

DMA Configuration Init_DMA()

15 November 2015Veton Këpuska159 Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; } Setting up DMA1-SPORT0 as Input/Receive Channel

15 November 2015Veton Këpuska160 DMA Channel’s Peripheral Map Register  Each DMA channel’s Peripheral Map register (DMAx_PERIPHERAL_MAP) contains bits that: Map the channel to a specific peripheral. Identify whether the channel is a Peripheral DMA channel or a Memory DMA channel. *pDMA1_PERIPHERAL_MAP= 0x1000;

15 November 2015Veton Këpuska161 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska162 DMA Configuration Register  The DMA Configuration register (DMAx_CONFIG/MDMA_yy_CONFIG), shown in Figure 9-3 of ADSP-BF533 Blackfin Processor Hardware Reference, also in this slide is used to set up DMA parameters and operating modes. *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1;

15 November 2015Veton Këpuska163 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska164 DMA Start Address Register  The Start Address register (DMAx_START_ADDR/MDMA_yy_START_ADDR), shown in Figure 9-2 of ADSP-BF533 Blackfin Processor Hardware Reference, also in the next slide, contains the start address of the data buffer currently targeted for DMA. *pDMA1_START_ADDR = iRxBuffer1;

15 November 2015Veton Këpuska165 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska166 DMA Count Register  For 1D DMA, it specifies the number of elements to read in. For 2D DMA details, see “Two-Dimensional DMA” on page 9-45 of ADSP-BF533 Blackfin Processor Hardware Reference. A value of 0 in X_COUNT corresponds to 65,536 elements. *pDMA1_X_COUNT = 8;

15 November 2015Veton Këpuska167 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska168 DMAx Modify Register  The Inner Loop Address Increment register (DMAx_X_MODIFY/MDMA_yy_X_MODIFY) contains a signed, two’s-complement byte-address increment. In 1D DMA, this increment is the stride that is applied after transferring each element.  Note X_MODIFY is specified in bytes, regardless of the DMA transfer size. *pDMA1_X_MODIFY= 4;

15 November 2015Veton Këpuska169 Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; } Setting up DMA2-SPORT0 as Output/Transmit Channel

15 November 2015Veton Këpuska170 DMA Channel’s Peripheral Map Register  Each DMA channel’s Peripheral Map register (DMAx_PERIPHERAL_MAP) contains bits that: Map the channel to a specific peripheral. Identify whether the channel is a Peripheral DMA channel or a Memory DMA channel. *pDMA2_PERIPHERAL_MAP= 0x2000;

15 November 2015Veton Këpuska171 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska172 DMA Configuration Register  The DMA Configuration register (DMAx_CONFIG/MDMA_yy_CONFIG), shown in Figure 9-3 of ADSP-BF533 Blackfin Processor Hardware Reference, also in this slide is used to set up DMA parameters and operating modes. *pDMA2_CONFIG = WDSIZE_32 | FLOW_1;

15 November 2015Veton Këpuska173 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska174 DMA Start Address Register  The Start Address register (DMAx_START_ADDR/MDMA_yy_START_ADDR), shown in Figure 9-2 of ADSP-BF533 Blackfin Processor Hardware Reference, also in the next slide, contains the start address of the data buffer currently targeted for DMA. *pDMA2_START_ADDR = iTxBuffer1;

15 November 2015Veton Këpuska175 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

15 November 2015Veton Këpuska176 DMA Count Register  For 1D DMA, it specifies the number of elements to read in. For 2D DMA details, see “Two-Dimensional DMA” on page 9-45 of ADSP-BF533 Blackfin Processor Hardware Reference. A value of 0 in X_COUNT corresponds to 65,536 elements. *pDMA2_X_COUNT = 8;

15 November 2015Veton Këpuska177 Initialize.c : Init_DMA() // // // Function:Init_DMA // // // Description: Initialize DMA1 in autobuffer mode to receive and DMA2 in // //autobuffer mode to transmit // // // void Init_DMA(void) { // Set up DMA1 to receive // Map DMA1 to Sport0 RX *pDMA1_PERIPHERAL_MAP = 0x1000; // Configure DMA1 // 32-bit transfers, Interrupt on completion, Autobuffer mode *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; // Start address of data buffer *pDMA1_START_ADDR = iRxBuffer1; // DMA inner loop count *pDMA1_X_COUNT = 8; // Inner loop address increment *pDMA1_X_MODIFY= 4; // Set up DMA2 to transmit // Map DMA2 to Sport0 TX *pDMA2_PERIPHERAL_MAP = 0x2000; // Configure DMA2 // 32-bit transfers, Autobuffer mode *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; // Start address of data buffer *pDMA2_START_ADDR = iTxBuffer1; // DMA inner loop count *pDMA2_X_COUNT = 8; // Inner loop address increment *pDMA2_X_MODIFY= 4; }

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI DMA 5.SPORT0 6.DMA Configuration 7.SPORT IRS 8.Enable DMA Support 9.Endless loop and processing Flag Interrupts

DMA Configuration Init_DMA()

15 November 2015Veton Këpuska180 DMAx Modify Register  The Inner Loop Address Increment register (DMAx_X_MODIFY/MDMA_yy_X_MODIFY) contains a signed, two’s-complement byte-address increment. In 1D DMA, this increment is the stride that is applied after transferring each element.  Note X_MODIFY is specified in bytes, regardless of the DMA transfer size. *pDMA2_X_MODIFY= 4;

15 November 2015Veton Këpuska181 Initialize.c : Enable_DMA_Sport() // // // Function:Enable_DMA_Sport // // // Description:Enable DMA1, DMA2, Sport0 TX and Sport0 RX // // // void Enable_DMA_Sport0(void) { // enable DMAs *pDMA2_CONFIG= (*pDMA2_CONFIG | DMAEN); *pDMA1_CONFIG= (*pDMA1_CONFIG | DMAEN); // enable Sport0 TX and RX *pSPORT0_TCR1 = (*pSPORT0_TCR1 | TSPEN); *pSPORT0_RCR1 = (*pSPORT0_RCR1 | RSPEN); }

15 November 2015Veton Këpuska182 DMA Configuration Register *pDMA2_CONFIG = WDSIZE_32 | FLOW_1; *pDMA2_CONFIG = *pDMA2_CONFIG | DMAEN *pDMA1_CONFIG = WNR | WDSIZE_32 | DI_EN | FLOW_1; *pDMA1_CONFIG = *pDMA1_CONFIG | DMAEN;

15 November 2015Veton Këpuska183 SPORTX Transmit Configuration 1 Register: SPORTx_TCR1 *pSPORT0_TCR1 = TFSR; TFSR = 0x0000; *pSPORT0_TCR1 = (*pSPORT0_TCR1 | TSPEN);

15 November 2015Veton Këpuska184 SPORTx Receive Configuration 1 Register : SPORTx_RCR1 *pSPORT0_RCR1 = RFSR; RFSR = 0x0000; *pSPORT0_RCR1 = (*pSPORT0_RCR1 | RSPEN);

Initialize.c 1.EBIU setup 2.Flash setup 3.FIO setup 4.ADI DMA 5.SPORT0 6.DMA Configuration 7.SPORT IRS 8.Enable DMA Support 9.Endless loop and processing Flag Interrupts

Event Controller for Interrupts and Exceptions

15 November 2015Veton Këpuska187 Event Controller  The Event Controller of the processor manages five types of activities or events: Emulation Reset Nonmaskable interrupts (NMI) Exceptions Interrupts (11)  Note the word event describes all five types of activities. The Event Controller manages fifteen different events in all: Emulation, Reset, NMI, Exception, and eleven Interrupts.

15 November 2015Veton Këpuska188 Event Controller  An interrupt is an event that changes normal processor instruction flow and is asynchronous to program flow.  In contrast, an exception is a software initiated event whose effects are synchronous to program flow.  The event system is nested and prioritized. Consequently, several service routines may be active at any time, and a low priority event may be pre-empted by one of higher priority.

15 November 2015Veton Këpuska189 Event Controller  The processor employs a two-level event control mechanism. The processor System Interrupt Controller (SIC) works with The Core Event Controller (CEC) to prioritize and control all system interrupts.  The SIC provides mapping between the many peripheral interrupt sources and the prioritized general-purpose interrupt inputs of the core. This mapping is programmable, and individual interrupt sources can be masked in the SIC.  The CEC supports nine (9) general-purpose interrupts (IVG7 – IVG15) in addition to the dedicated interrupt and exception events that are described in Table 4-6. It is recommended that the  two lowest priority interrupts (IVG14 and IVG15) be reserved for software interrupt handlers, leaving  seven prioritized interrupt inputs (IVG7 – IVG13) to support the system. Refer to Table 4-6 for details.

15 November 2015Veton Këpuska190 Core Event Mapping

15 November 2015Veton Këpuska191 System Event Mapping

15 November 2015Veton Këpuska192 Processor Event Controller  Processor Event Controller Consists of 2 stages: The Core Event Controller (CEC) System Interrupt Controller (SIC)  Conceptually: Interrupts from the peripherals arrive at SIC SIC routes interrupts directly to general- purpose interrupts of the CEC.

15 November 2015Veton Këpuska193 Core Event Controller (CEC)  CEC supports 9 general-purpose interrupts: IVG15-7  IVG15-14 – (2) lowest priority interrupts for software handlers.  IRVG13-7 – (7) highest to support peripherals. Additional dedicated interrupt and exception events.

15 November 2015Veton Këpuska194 System Interrupt Controller (SIC)  SIC provides mapping and routing of events: From: Peripheral interrupt sources To: Prioritized general-purpose interrupt inputs of the CEC.  Note: Processor default mapping can be altered by the user via Interrupt Assignment Register (IAR).

15 November 2015Veton Këpuska195 BF533 System & Core Interrupt Controllers Emulator0EMU Reset1RST Non Maskable Interrupt2NMI Exceptions3EVSW Reserved4- Hardware Error5IVHW Core Timer6IVTMR General Purpose 77IVG7 General Purpose 88IVG8 General Purpose 99IVG9 General Purpose 1010IVG10 General Purpose 1111IVG11 General Purpose 1212IVG12 General Purpose 1313IVG13 General Purpose 1414IVG14 General Purpose 1515IVG15 PLL Wakeup interruptIVG7 DMA error (generic)IVG7 PPI error interruptIVG7 SPORT0 error interruptIVG7 SPORT1 error interruptIVG7 SPI error interruptIVG7 UART error interruptIVG7 RTC interruptIVG8 DMA 0 interrupt (PPI)IVG8 DMA 1 interrupt (SPORT0 RX)IVG9 DMA 2 interrupt (SPORT0 TX)IVG9 DMA 3 interrupt (SPORT1 RX)IVG9 DMA 4 interrupt (SPORT1 TX)IVG9 DMA 5 interrupt (SPI)IVG10 DMA 6 interrupt (UART RX)IVG10 DMA 7 interrupt (UART TX)IVG10 Timer0 interruptIVG11 Timer1 interruptIVG11 Timer2 interruptIVG11 PF interrupt AIVG12 PF interrupt BIVG12 DMA 8/9 interrupt (MemDMA0)IVG13 DMA 10/11 interrupt (MemDMA1)IVG13 Watchdog Timer InterruptIVG13 Event Source IVG # Core Event Name System Interrupt SourceIVG # 1 P r i o r i t y Highest Lowest

15 November 2015Veton Këpuska196 System Interrupt Processing  Referring to Figure 4-5, note when an interrupt (Interrupt A) is generated by an interrupt-enabled peripheral: 1.SIC_ISR logs the request and keeps track of system interrupts that are asserted but not yet serviced (that is, an interrupt service routine hasn’t yet cleared the interrupt). 2.SIC_IWR checks to see if it should wake up the core from an idled state based on this interrupt request. 3.SIC_IMASK masks off or enables interrupts from peripherals at the system level. If Interrupt A is not masked, the request proceeds to Step 4. 4.The SIC_IARx registers, which map the peripheral interrupts to a smaller set of general-purpose core interrupts (IVG7 – IVG15), determine the core priority of Interrupt A.

15 November 2015Veton Këpuska197 System Interrupt Processing (cont.) 5.ILAT adds Interrupt A to its log of interrupts latched by the core but not yet actively being serviced. 6.IMASK masks off or enables events of different core priorities. If the IVGx event corresponding to Interrupt A is not masked, the process proceeds to Step 7. 7.The Event Vector Table (EVT) is accessed to look up the appropriate vector for Interrupt A’s interrupt service routine (ISR). 8.When the event vector for Interrupt A has entered the core pipeline, the appropriate IPEND bit is set, which clears the respective ILAT bit. Thus, IPEND tracks all pending interrupts, as well as those being presently serviced. 9.When the interrupt service routine (ISR) for Interrupt A has been executed, the RTI instruction clears the appropriate IPEND bit. However, the relevant SIC_ISR bit is not cleared unless the interrupt service routine clears the mechanism that generated Interrupt A, or if the process of servicing the interrupt clears this bit.

15 November 2015Veton Këpuska198 Interrupt Processing Block Diagram 1.SIC_ISR logs the request and keeps track of system interrupts that are asserted but not yet serviced (that is, an interrupt service routine hasn’t yet cleared the interrupt). 2.SIC_IWR checks to see if it should wake up the core from an idled state based on this interrupt request. 3.SIC_IMASK masks off or enables interrupts from peripherals at the system level. If Interrupt A is not masked, the request proceeds to Step 4. 4.The SIC_IARx registers, which map the peripheral interrupts to a smaller set of general-purpose core interrupts (IVG7 – IVG15), determine the core priority of Interrupt A. 5.ILAT adds Interrupt A to its log of interrupts latched by the core but not yet actively being serviced. 6.IMASK masks off or enables events of different core priorities. If the IVGx event corresponding to Interrupt A is not masked, the process proceeds to Step 7. 7.The Event Vector Table (EVT) is accessed to look up the appropriate vector for Interrupt A’s interrupt service routine (ISR). 8.When the event vector for Interrupt A has entered the core pipeline, the appropriate IPEND bit is set, which clears the respective ILAT bit. Thus, IPEND tracks all pending interrupts, as well as those being presently serviced. 9.When the interrupt service routine (ISR) for Interrupt A has been executed, the RTI instruction clears the appropriate IPEND bit. However, the relevant SIC_ISR bit is not cleared unless the interrupt service routine clears the mechanism that generated Interrupt A, or if the process of servicing the interrupt clears this bit. It should be noted that emulation, reset, NMI, and exception events, as well as hardware error (IVHW) and core timer (IVTMR) interrupt requests, enter the interrupt processing chain at the ILAT level and are not affected by the system- level interrupt registers (SIC_IWR, SIC_ISR, SIC_IMASK, SIC_IARx).

15 November 2015Veton Këpuska199 Interrupt Service Routine  ISR address is stored in the Event Vector Table Used as the next fetch address when the event occurs  Program Counter (PC) address is saved to a register RETI, RETX, RETN, RETE, based on event  ISR always concludes with “Return” Instruction RTI, RTX, RTN, RTE (respectively) When executed, PC is loaded with address stored in RETI, RETX, RETN, or RETE to continue app code  Optional nesting of higher-priority interrupts possible See app. note EE-192, which covers writing interrupt routines in C (

15 November 2015Veton Këpuska200 System Peripheral Interrupts  The processor system has numerous peripherals, which therefore require many supporting interrupts. Table 4-7 lists: The Peripheral Interrupt source The Peripheral Interrupt ID used in the System Interrupt Assignment registers (SIC_IARx). See “System Interrupt Assignment Registers (SIC_IARx)” on page 4-30 of BF533 HRM. The general-purpose interrupt of the core to which the interrupt maps at reset The Core Interrupt ID used in the System Interrupt Assignment registers (SIC_IARx). See “System Interrupt Assignment Registers (SIC_IARx)” on page 4-30 of BF533 HRM.

15 November 2015Veton Këpuska201 Peripheral Interrupt Source at Reset State

15 November 2015Veton Këpuska202 Peripheral Interrupt Source at Reset State

15 November 2015Veton Këpuska203 Initialization of Interrupts  If the default assignments shown in Table 4-7 are acceptable, then interrupt initialization involves only: 1.Initialization of the core Event Vector Table (EVT) vector address entries. Why is this needed? 2.Initialization of the IMASK register 3.Unmasking the specific peripheral interrupts in SIC_IMASK that the system requires

15 November 2015Veton Këpuska204 Initialization of Core Vector Table  The Event Vector Table (EVT) is a hardware table with sixteen entries that are each 32 bits wide.  The EVT contains an entry for each possible core event. Entries are accessed as MMRs, and each entry can be programmed at reset with the corresponding vector address for the interrupt service routine.  When an event occurs, instruction fetch starts at the address location in the EVT entry for that event. The processor architecture allows unique addresses to be programmed into each of the interrupt vectors; that is, interrupt vectors are not determined by a fixed offset from an interrupt vector table base address. This approach minimizes latency by not requiring a long jump from the vector table to the actual ISR code.  Table 4-9 lists events by priority. Each event has a corresponding bit in the event state registers: ILAT, IMASK, and IPEND.

15 November 2015Veton Këpuska205 Core Event Vector Table

15 November 2015Veton Këpuska206 Core Event Vector Table

SPORT Interrupts Initialization Init_Sport_Interrupts()

15 November 2015Veton Këpuska208 Initialize.c : Init_Sport_Interrupts() // // // Function:Init_Interrupts // // // Description:Initialize Interrupt for Sport0 RX // // // void Init_Sport_Interrupts(void) { // Set Sport0 RX (DMA1) interrupt priority to 2 = IVG9 *pSIC_IAR0 = 0xffffffff; *pSIC_IAR1 = 0xffffff2f; *pSIC_IAR2 = 0xffffffff; // assign ISRs to interrupt vectors // Sport0 RX ISR -> IVG 9 register_handler(ik_ivg9, Sport0_RX_ISR); // enable Sport0 RX interrupt *pSIC_IMASK = 0x ; ssync(); }

15 November 2015Veton Këpuska209 System Interrupt Assignment Registers (SIC_IARx)  The relative priority of peripheral interrupts can be set by mapping the peripheral interrupt to the appropriate general-purpose interrupt level in the core.  The mapping is controlled by the System Interrupt Assignment register settings, as detailed in Figure 4-9, Figure 4-10, and Figure  If more than one interrupt source is mapped to the same interrupt, they are logically OR-ed, with no hardware prioritization. Software can prioritize the interrupt processing as required for a particular system application.

15 November 2015Veton Këpuska210 Mapping of Values in SIC_IARx Register to General Purpose Interrupt  Table 4-8 defines the value to write in SIC_IARx to configure a peripheral for a particular IVG priority.

15 November 2015Veton Këpuska211 System Interrupt Assignment Register *pSIC_IAR0 = 0xffffffff; 0xffffffff = All Corresponding Interrupts in this register are set to lowest priority

15 November 2015Veton Këpuska212 System Interrupt Assignment Register *pSIC_IAR1 = 0xffffff2f; 0xffffff2f = DMA1 (SPORT0 RX) is set to “2” priority

15 November 2015Veton Këpuska213 System Interrupt Assignment Register *pSIC_IAR2 = 0xffffffff; 0xffffffff = Do not forget to set appropriate Interrupt Priority Values for PF A interrupts.

15 November 2015Veton Këpuska214 Initialize.c : Init_Sport_Interrupts() // // // Function:Init_Interrupts // // // Description:Initialize Interrupt for Sport0 RX // // // void Init_Sport_Interrupts(void) { // Set Sport0 RX (DMA1) interrupt priority to 2 = IVG9 *pSIC_IAR0 = 0xffffffff; *pSIC_IAR1 = 0xffffff2f; *pSIC_IAR2 = 0xffffffff; // assign ISRs to interrupt vectors // Sport0 RX ISR -> IVG 9 register_handler(ik_ivg9, Sport0_RX_ISR); // enable Sport0 RX interrupt *pSIC_IMASK = 0x ; ssync(); }

15 November 2015Veton Këpuska215 Interrupt Handler Support  The Blackfin C/C++ compiler provides support for interrupts and other events used by the Blackfin processor architecture (see Table 1-25 of VisualDSP C/C++ Compiler and Library Manual for Blackfin Processors).  The Blackfin system has several different classes of events, not all of which are supported by the ccblkfn compiler. Handlers for these events are called Interrupt Service Routines (ISRs).  The compiler provides facilities for defining an ISR function, registering it as an event handler, and for obtaining the saved processor context.

15 November 2015Veton Këpuska216 Defining an ISR  To define a function as an ISR, the sys/exception.h header must be included and the function must be declared and defined using macros defined within this header file. Where is this file included in the LED Lab #1 example?  There is a macro for each of the three kinds of events the compiler supports: EX_INTERRUPT_HANDLER EX_EXCEPTION_HANDLER EX_NMI_HANDLER Which macro was used in Lab #1 exercise?  By default, the ISRs generated by the compiler are not re- entrant; they disable the interrupt system on entry, and re- enable it on exit. You may also define ISRs for interrupts which are re-entrant, and which re-enable the interrupt system soon after entering the ISR.

15 November 2015Veton Këpuska217 Example #include static int number_of_interrupts; EX_INTERRUPT_HANDLER(my_isr) { number_of_interrupts++; }  This example declares and defines my_isr() as a handler for interrupt-type events.  The macro used for defining the ISR is also suitable for declaring it as a prototype: EX_INTERRUPT_HANDLER(my_isr);  Example: Talkthrough.h: EX_INTERRUPT_HANDLER(Sport0_RX_ISR);

15 November 2015Veton Këpuska218 Registering an ISR  ISRs, once defined, can be registered in the Event Vector Table (EVT) using the register_handler_ex() function or the register_handler() function, both of which also update the IMASK register so that interrupt can take effect.  Only the register_handler_ex() function will be discussed here, as it is an extended version of the register_handler() function. Refer to “register_handler_ex” on page of VisualDSP C/C++ Compiler and Library Manual for Blackfin Processors for more information about it.  The register_handler_ex() function takes three parameters, defining the event, the ISR, and whether the interrupt should be enabled, disabled, or left in its current state. It also returns the previously registered ISR (if any). The event is specified using the interrupt_kind enumeration from exception.h.

15 November 2015Veton Këpuska219 Registering an ISR typedef enum { ik_emulation, ik_reset, ik_nmi, ik_exception, ik_global_int_enable, ik_hardware_err, ik_timer, ik_ivg7, ik_ivg8, ik_ivg9, ik_ivg10, ik_ivg11, ik_ivg12, ik_ivg13, ik_ivg14, ik_ivg15 } interrupt_kind; ex_handler_fn register_handler_ex(interrupt_kind kind, ex_handler_fn fn, int enable);  Which enumeration types were used in the LAB exercise?

15 November 2015Veton Këpuska220 register_handler  Register event handlers  Synopsis #include ex_handler_fn register_handler (interrupt_kind kind, ex_handler_fn fn);  Description The register_handler function determines how the hardware event kind is handled. This is done by  registering the function pointed to by fn as a handler for the event and  updating the IMASK register so that interrupt can take effect.  The kind event is an enumeration identifying each of the hardware events— interrupts and exceptions—accepted by the Blackfin processor. Note:  The register_handler_ex function provides an extended and more functional interface than register_handler. For the values for interrupt_kind, refer to “Registering an ISR” on page of VisualDSP C/C++ Compiler and Library Manual for Blackfin Processors presented also in the previous slide. The fn must be one of the values are listed in the table in the next slide.

15 November 2015Veton Këpuska221 Table of fn values  Which function value was used in the Lab exercise?

15 November 2015Veton Këpuska222 Initialize.c : Init_Sport_Interrupts() // // // Function:Init_Interrupts // // // Description:Initialize Interrupt for Sport0 RX // // // void Init_Sport_Interrupts(void) { // Set Sport0 RX (DMA1) interrupt priority to 2 = IVG9 *pSIC_IAR0 = 0xffffffff; *pSIC_IAR1 = 0xffffff2f; *pSIC_IAR2 = 0xffffffff; // assign ISRs to interrupt vectors // Sport0 RX ISR -> IVG 9 register_handler(ik_ivg9, Sport0_RX_ISR); // enable Sport0 RX interrupt *pSIC_IMASK = 0x ; ssync(); } Unmasking of the Interrupt by setting corresponding bits in SIC_IMASK register.

15 November 2015Veton Këpuska223 SIC_IMASK Register  The System Interrupt Mask register (SIC_IMASK, shown in Figure 4-8 Blacfin BF533 HRM) allows masking of any peripheral interrupt source at the System Interrupt Controller (SIC), independently of whether it is enabled at the peripheral itself.  A reset forces the contents of SIC_IMASK to all 0s to mask off all peripheral interrupts. Writing a 1 to a bit location turns off the mask and enables the interrupt.  Although this register can be read from or written to at any time (in Supervisor mode), it should be configured in the reset initialization sequence before enabling interrupts.

15 November 2015Veton Këpuska224 SIC_IMASK Register *pSIC_IMASK = 0x ; 0x = DMA Interrupt SPORT0 RX Do not forget to Unmask Interrupt associated with PF Interrupt A

15 November 2015Veton Këpuska225 Synchronization  Synchronization Functions void csync(void) void ssync(void) These two functions provide synchronization.  The csync() function is a core-only synchronization—it flushes the pipeline and store buffers.  The ssync() function is a system synchronization, and also waits for an ACK instruction from the system bus.

Servicing Interrupts SPORT0_ISR

15 November 2015Veton Këpuska227 SPORT0_ISR // // // Function:Sport0_RX_ISR // // // Description: This ISR is executed after a complete frame of input data // //has been received. The new samples are stored in // //iChannel0LeftIn, iChannel0RightIn, iChannel1LeftIn and // //iChannel1RightIn respectively. Then the function // //Process_Data() is called in which user code can be executed. // //After that the processed values are copied from the // //variables iChannel0LeftOut, iChannel0RightOut, // //iChannel1LeftOut and iChannel1RightOut into the dma // //transmit buffer. // // // EX_INTERRUPT_HANDLER(Sport0_RX_ISR) { // confirm interrupt handling *pDMA1_IRQ_STATUS = 0x0001; // copy input data from dma input buffer into variables iChannel0LeftIn = iRxBuffer1[INTERNAL_ADC_L0]; iChannel0RightIn = iRxBuffer1[INTERNAL_ADC_R0]; iChannel1LeftIn = iRxBuffer1[INTERNAL_ADC_L1]; iChannel1RightIn = iRxBuffer1[INTERNAL_ADC_R1]; // call function that contains user code Process_Data();

15 November 2015Veton Këpuska228 DMA Interrupt Status Registers

15 November 2015Veton Këpuska229 DMAx_IRQ_STATUS/MDMA_yy_ IRQ_STATUS Register  DMAx_IRQ_STATUS/MDMA_yy_IRQ_STATUS Register  The Interrupt Status register (DMAx_IRQ_STATUS/MDMA_yy_IRQ_STATUS), shown in Figure 9- 13, contains bits that record whether the DMA channel: Is enabled and operating, enabled but stopped, or disabled. Is fetching data or a DMA descriptor. Has detected that a global DMA interrupt or a channel interrupt is being asserted. Has logged occurrence of a DMA error. Note the DMA_DONE interrupt is asserted when the last memory access (read or write) has completed.  Note: For a memory transfer to a peripheral, there may be up to four data words in the channel’s DMA FIFO when the interrupt occurs. At this point, it is normal to immediately start the next work unit. If, however, the application needs to know when the final data item is actually transferred to the peripheral, the application can test or poll the DMA_RUN bit. As long as there is undelivered transmit data in the FIFO, the DMA_RUN bit is 1.

15 November 2015Veton Këpuska230 DMAx_IRQ_STATUS Register *pDMA1_IRQ_STATUS = 0x0001;

15 November 2015Veton Këpuska231 SPORT0_ISR // // // Function:Sport0_RX_ISR // // // Description: This ISR is executed after a complete frame of input data // //has been received. The new samples are stored in // //iChannel0LeftIn, iChannel0RightIn, iChannel1LeftIn and // //iChannel1RightIn respectively. Then the function // //Process_Data() is called in which user code can be executed. // //After that the processed values are copied from the // //variables iChannel0LeftOut, iChannel0RightOut, // //iChannel1LeftOut and iChannel1RightOut into the dma // //transmit buffer. // // // EX_INTERRUPT_HANDLER(Sport0_RX_ISR) { // confirm interrupt handling *pDMA1_IRQ_STATUS = 0x0001; // copy input data from dma input buffer into variables iChannel0LeftIn = iRxBuffer1[INTERNAL_ADC_L0]; iChannel0RightIn = iRxBuffer1[INTERNAL_ADC_R0]; iChannel1LeftIn = iRxBuffer1[INTERNAL_ADC_L1]; iChannel1RightIn = iRxBuffer1[INTERNAL_ADC_R1]; // call function that contains user code Process_Data();

15 November 2015Veton Këpuska232 SPORT0_ISR // copy processed data from variables into dma output buffer iTxBuffer1[INTERNAL_DAC_L0] = iChannel0LeftOut; iTxBuffer1[INTERNAL_DAC_R0] = iChannel0RightOut; iTxBuffer1[INTERNAL_DAC_L1] = iChannel1LeftOut; iTxBuffer1[INTERNAL_DAC_L2] = iChannel1LeftOut; iTxBuffer1[INTERNAL_DAC_R1] = iChannel1RightOut; iTxBuffer1[INTERNAL_DAC_R2] = iChannel1RightOut; }

Processing Input Audio Data Process_data()

15 November 2015Veton Këpuska234 Process_data() #include "Talkthrough.h" #include // // // Function:Process_Data() // // // Description: This function is called from inside the SPORT0 ISR every // //time a complete audio frame has been received. The new // //input samples can be found in the variables iChannel0LeftIn,// //iChannel0RightIn, iChannel1LeftIn and iChannel1RightIn // //respectively. The processed data should be stored in // //iChannel0LeftOut, iChannel0RightOut, iChannel1LeftOut,// //iChannel1RightOut, iChannel2LeftOut and iChannel2RightOut// //respectively.// // // void Process_Data(void) { iChannel1LeftOut = iChannel1LeftIn; iChannel1RightOut = iChannel1RightIn; //write data to BTC channel int nValue; extern int BTCLeftVolume; extern int BTCRightVolume;

15 November 2015Veton Këpuska235 Process_data() nValue = (iChannel0LeftIn >> 8); //upper 24-bits nValue = (nValue >> BTCLeftVolume);//volume btc_write_value(0, (unsigned int*)&nValue, sizeof(nValue)); iChannel0LeftOut = (nValue << 8); nValue = (iChannel0RightIn >> 8); //upper 24-bits nValue = (nValue >> BTCRightVolume); //volume btc_write_value(1, (unsigned int*)&nValue, sizeof(nValue)); iChannel0RightOut = (nValue << 8); }

15 November 2015Veton Këpuska236 Init_Sport0 // // // Function:Init_Sport0 // // // Description: Configure Sport0 for TDM mode, to transmit/receive data // //to/from the AD1836. Configure Sport for external clocks and // //frame syncs. // // // void Init_Sport0(void) { // Sport0 receive configuration // External CLK, External Frame sync, MSB first // 32-bit data *pSPORT0_RCR1 = RFSR; *pSPORT0_RCR2 = SLEN_32; // Sport0 transmit configuration // External CLK, External Frame sync, MSB first // 24-bit data *pSPORT0_TCR1 = TFSR; *pSPORT0_TCR2 = SLEN_32; // Enable MCM 8 transmit & receive channels *pSPORT0_MTCS0 = 0x000000FF; *pSPORT0_MRCS0 = 0x000000FF; // Set MCM configuration register and enable MCM mode *pSPORT0_MCMC1 = 0x0000; *pSPORT0_MCMC2 = 0x101c; }

15 November 2015Veton Këpuska237 SPORTx_RCR1 and SPORTx_RCR2 Registers  The main control registers for the receive portion of each SPORT are the Receive Configuration registers: SPORTx_RCR1 and SPORTx_RCR2.  A SPORT is enabled for receive if Bit 0 (RSPEN) of the Receive Configuration 1 register is set to 1. This bit is cleared during either a hard reset or a soft reset, disabling all SPORT reception.  When the SPORT is enabled to receive (RSPEN set), corresponding SPORT Configuration register writes are not allowed except for SPORTx_RCLKDIV and Multichannel Mode Channel Select registers. Writes to disallowed registers have no effect. While the SPORT is enabled,`SPORTx_RCR1 is not written except for bit 0 (RSPEN). For example: write (SPORTx_RCR1, 0x0001) ; /* SPORT RX Enabled */ write (SPORTx_RCR1, 0xFF01) ; /* ignored, no effect */ write (SPORTx_RCR1, 0xFFF0) ; /* SPORT disabled, SPORTx_RCR1 still equal to 0x0000 */

15 November 2015Veton Këpuska238 SPORTx Receive Configuration 1 Register *pSPORT0_RCR1 = RFSR; RFSR = 0x000; *pSPORT0_RCR1 = RFSR; RFSR = 0x000;

15 November 2015Veton Këpuska239 SPORTx Receive Configuration 2 Register *pSPORT0_RCR2 = SLEN_32;

15 November 2015Veton Këpuska240 SPORTx_RCR1 and SPORTxRCR2 Registers  Additional information for the SPORTx_RCR1 and SPORTxRCR2 Receive Configuration register bits: Receive Enable (RSPEN). This bit selects whether the SPORT is  enabled to receive (if set) or  disabled (if cleared). Setting the RSPEN bit turns on the SPORT and  causes it to sample data from the data receive pins as well as  the receive bit clock and  Receive Frame Sync pins if so programmed.  Setting RSPEN enables the SPORTx receiver, which can generate a SPORTx RX interrupt. For this reason, the code should initialize the ISR and the DMA control registers, and should be ready to service RX interrupts before setting RSPEN. Setting RSPEN also generates DMA requests if DMA is enabled and data is received.  Set all DMA control registers before setting RSPEN.

15 November 2015Veton Këpuska241 SPORTx_RCR1 and SPORTxRCR2 Registers  Clearing RSPEN causes the SPORT to stop receiving data; it also shuts down the internal SPORT receive circuitry. In low power applications, battery life can be extended by clearing RSPEN whenever the SPORT is not in use.

15 November 2015Veton Këpuska242 SPORTx_TCR1 and SPORTx_TCR2 Registers  The main control registers for the transmit portion of each SPORT are the Transmit Configuration registers, SPORTx_TCR1 and SPORTx_TCR2.  A SPORT is enabled for transmit if Bit 0 (TSPEN) of the Transmit Configuration 1 register is set to 1.  This bit is cleared during either a hard reset or a soft reset, disabling all SPORT transmission.  When the SPORT is enabled to transmit (TSPEN set), corresponding SPORT Configuration register writes are not allowed except for SPORTx_TCLKDIV and Multichannel Mode Channel Select registers. Writes to disallowed registers have no effect. While the SPORT is enabled, SPORTx_TCR1 is not written except for bit 0 (TSPEN). For example: write (SPORTx_TCR1, 0x0001) ; /* SPORT TX Enabled */ write (SPORTx_TCR1, 0xFF01) ; /* ignored, no effect */ write (SPORTx_TCR1, 0xFFF0) ; /* SPORT disabled, SPORTx_TCR1 still equal to 0x0000 */

15 November 2015Veton Këpuska243 SPORTX Transmit Configuration 1 Register: SPORTx_TCR1 *pSPORT0_TCR1 = TFSR; TFSR = 0x000; *pSPORT0_TCR1 = TFSR; TFSR = 0x000;

15 November 2015Veton Këpuska244 SPORTX Transmit Configuration 2 Register: SPORTx_TCR2 *pSPORT0_TCR2 = SLEN_32;

15 November 2015Veton Këpuska245 SPORTs Multichannel Operation  SPORTx_MTCSn Registers  The Multichannel Selection registers are used to enable and disable individual channels. The four SPORTx Multichannel Transmit Select registers (SPORTx_MTCSn) specify the active transmit channels.  There are four registers, each with 32 bits, corresponding to the 128 channels. Setting a bit enables that channel so that the serial port selects that word for transmit from the multiple word block of data. For example, setting bit 0 selects word 0, setting bit 12 selects word 12, and so on.

15 November 2015Veton Këpuska246 SPORTs Multichannel Operation  Setting a particular bit in a SPORTx_MTCSn register causes the serial port to transmit the word in that channel’s position of the datastream. Clearing the bit in the SPORTx_MTCSn register causes the serial port’s data transmit pin to three-state during the time slot of that channel.

15 November 2015Veton Këpuska247 SPORT Multichannel Registers  SPORTx_MRCSn Registers  The Multichannel Selection registers are used to enable and disable individual channels. The SPORTx Multichannel Receive Select registers (SPORTx_MRCSn) specify the active receive channels.  There are four registers, each with 32 bits, corresponding to the 128 channels. Setting a bit enables that channel so that the serial port selects that word for receive from the multiple word block of data. For example, setting bit 0 selects word 0, setting bit 12 selects word 12, and so on.

15 November 2015Veton Këpuska248 SPORTx Multichannel Transmit Select Registers *pSPORT0_MTCS0 = 0x000000FF;

15 November 2015Veton Këpuska249 SPORTx Multichannel Receive Select Registers *pSPORT0_MRCS0 = 0x000000FF;

15 November 2015Veton Këpuska250 main.c #include "Talkthrough.h" #include "sysreg.h" #include "ccblkfn.h" #include // // // Variables // // // Description: The variables iChannelxLeftIn and iChannelxRightIn contain // //the data coming from the codec AD1836. The (processed) // //playback data are written into the variables // //iChannelxLeftOut and iChannelxRightOut respectively, which // //are then sent back to the codec in the SPORT0 ISR. // //The values in the array iCodec1836TxRegs can be modified to // //set up the codec in different configurations according to // //the AD1885 data sheet. // // // // left input data from ad1836 int iChannel0LeftIn, iChannel1LeftIn; // right input data from ad1836 int iChannel0RightIn, iChannel1RightIn; // left ouput data for ad1836 int iChannel0LeftOut, iChannel1LeftOut; // right ouput data for ad1836 int iChannel0RightOut, iChannel1RightOut; // SPORT0 DMA transmit buffer volatile int iTxBuffer1[8]; // SPORT0 DMA receive buffer volatile int iRxBuffer1[8];

Processing Input Audio Data Process_data()

15 November 2015Veton Këpuska252 Process_data() #include "Talkthrough.h" #include // // // Function:Process_Data() // // // Description: This function is called from inside the SPORT0 ISR every // //time a complete audio frame has been received. The new // //input samples can be found in the variables iChannel0LeftIn,// //iChannel0RightIn, iChannel1LeftIn and iChannel1RightIn // //respectively. The processed data should be stored in // //iChannel0LeftOut, iChannel0RightOut, iChannel1LeftOut,// //iChannel1RightOut, iChannel2LeftOut and iChannel2RightOut// //respectively.// // // void Process_Data(void) { iChannel0LeftOut = iChannel0LeftIn; iChannel0RightOut = iChannel0RightIn; iChannel1LeftOut = iChannel1LeftIn; iChannel1RightOut = iChannel1RightIn; //write data to BTC channel int nValue; extern int BTCLeftVolume; extern int BTCRightVolume;

15 November 2015Veton Këpuska253 Process_data() nValue = (iChannel0LeftIn >> 8); //upper 24-bits iChannel0LeftOut = (nValue << 8); nValue = (iChannel0RightIn >> 8); //upper 24-bits iChannel0RightOut = (nValue << 8); }