LOGO Lab Supervisor – Dr. WH Lau EE3271 Design Laboratory

LOGO Aims and Objectives  Design and implement a MP3 Player  Learn the ICs operation and how to use program to drive the ICs work.  Learn data transfer in between ICs

LOGO MP3 Overall Flow

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Block Diagram of MP3 Player

LOGO Components Description  LPCEB2000-B Processor Board  Installed with a Philips ARM processor LPC2292  Two debugging modes are available via JTAG_EN Jumper and ETM_EN Jumper  Boot set jumper: can boot from internal flash or external flash by jumper set.  Two I/O ports (P0.0-31, P1.0-31) for I/O interface

LOGO  J1, J2, J3, J4 are connectors for external bus interface. J1 and J3 are 40 Pins, J2 and J4 are 20 Pins. J1 and J2 are used to connect the board to applied board, J3 and J4 are used to extend upwards J1 J2 J3 J4

LOGO  STA015  Microelectronics MP3 decoder chip  An MPEG Layer III audio decoder with ADPCM compression / decompression capabilities and BYPASS mode for auxiliary audio sources post-processing  Decodes elementary streams compressed by using low sampling rates  Receives the input data through a Serial input Interface  The decoded signal can be a stereo, mono, or dual channel digital output.  Interfaced to LPC2292 using the I2C and SPI interface pins of Port 0  Equipped with a buffer

LOGO  CS4334  Stereo digital-to-analog output systems including interpolation, 1-bit D/A conversion and output analog filtering in an 8-pin package  Adjustment of sample rate between 2 kHz and 100 kHz simply by changing the master clock frequency  On-chip digital de-emphasis, operates from a single +5 V power supply, and requires minimal support circuitry  Ideal for portable CD players and other portable playback systems  Directly connected to the output of STA015 via the IIS interface

LOGO  LCD Display  16 characters, 2 rows LCD module  Requires 8-bit ASCII character input and 3 input control signals  Use for testing wire-wrapped board is correctly installed

LOGO Bus Setting - I2C  A bi-directional 2-wire bus for efficient inter-IC control  There are Serial Data Line (SDA) and Serial Clock Line (SCL)  In this lab, we used I2C to configure the STA015.

LOGO Bus Setting - Data Request  We use polling to keep checking the data port (EINT3)  When the buffer in STA015 underflow, it will generate a data request signal.

LOGO Bus Setting – SPI  SPI (Serial Peripheral Interface)  Uses the MOSI (Master Output Slave Input) and MISO (Master Input Slave Output) pins to perform serial byte data transfer.  In this lab, we use SPI to stream the data from LPC2292 to STA015.

LOGO The flow of bus SCK SSEL MISO, MOSI SCK WS SD

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Design Flow  System Initialization  LCD Initialization  I2C Initialization  STA015 Initialization  SPI Initialization  STA015 Data Request Signal (Polling)  Play song

LOGO System Initialization  Set all the port 0 to GPIO ports  Set the PLL Clock frequency to 60MHz  Code: System_Init() in LCD.c

LOGO LCD Initialization  Set the LCD data pins  By sending command to set the preferences of the LCD display  Code: LCD_Init() in LCD.c Related functions: --SendCommand(char cmd); --sendchar(char a); --LCD_output(char *str);

LOGO I2C Initialization  Code: I2C_Init() in I2C_Test.c Related functions: --I2C_IRQ_Srv(); --uint8 I2CTest_SendStr(uint8 SlaveAddr, uint8 WrAddr,uint8 *Str,uint8 number); --uint8 I2CTest_RcvStr(uint8 SlaveAddr, uint8 RDAddr,uint8 *Str,uint8 number);

LOGO STA015 Initialization

LOGO STA015 Initialization  Code: sta015_init() in sta015.c

LOGO SPI Initialization  Modify the Clock of SPI  Update the spi_set() function  Code: SPI_Init() in SPI_Test.c Related functions: spi_set()

LOGO STA015 Data Request Signal (Polling)  Code: Main() in mp3.c while(1){ if ((IOPIN0 & P30) == P30) { spi_set(*song1); song1++; } ……. }

LOGO Play song  Download a mp3 file to a particular address through EmbestIDE softwares  Run all the initialialzation functions  Signal spi to send data  Code: Main() in mp3.c

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Testing  Check register $01(IDENT), return 0xAC if STA015 is presence  Using the Oscilloscope -- Checking I2C Clock, I2C Data -- Checking SPI Clock, SPI Data -- Checking 1KHz tone frequency

LOGO Difficulties Encountered  Unclear concept of STA015  Using wrong Oversampling Ratio  Missing Hardware Reset  Missing Data Request

LOGO Conclusion  What we had learnt -- Project Management -- STA015 configuration -- Debugging with Oscilloscope -- Practically understand I2C and SPI data transfer bus

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