Microcontroller Programming (주)한백전자

Atmega128

AVR – Atmega128L High-performance, Low-power AVR® 8-bit Microcontroller Advanced RISC Architecture Up to 16 MIPS Throughput at 16 MHz 128K Bytes of In-System Reprogrammable Flash 4K Bytes Internal SRAM 4K Bytes EEPROM Peripheral Features 4 Timer 10bit – ADC 8 channel SPI, I2C, UART Interface Six Sleep Modes

GPIO General Purpose Input/Output It can act as input to read digital signal from other devices Or it can act as output to control 0 or 1 to outside Important Registers for GPIO in Atmega128 DDx: setting input or output direction PORTx: Input: pull-up resistor on/off Output: signal 0 or 1 PINx: read input signal

Atmega 128’ GPIO

ZigbeX MCU Circuit

LED Circuit

Programming 3 LED On Make new c file Search GPIO registers Setting register Compile with avr-gcc avr-gcc -o output -Os -mmcu=atmega128 main.c xxx.c avr-objcopy -O ihex output main.hex

Implement 3 LED on

Timer ZigbeX utilizes two Clocks 7,372,800 Hz: Main clock 32,768 Hz: Timer 0 clock

Timer Interrupt 1 Overflow Interrupt

Timer Interrupt 2 Compare Interrupt

Atmega 128 interrupt #define SIG_INTERRUPT0 _VECTOR(1) #define SIG_OUTPUT_COMPARE2 _VECTOR(9) #define SIG_OVERFLOW2 _VECTOR(10) #define SIG_INPUT_CAPTURE1 _VECTOR(11) #define SIG_OUTPUT_COMPARE1A _VECTOR(12) #define SIG_OUTPUT_COMPARE1B _VECTOR(13) #define SIG_OVERFLOW1 _VECTOR(14) #define SIG_OUTPUT_COMPARE0 _VECTOR(15) #define SIG_OVERFLOW0 _VECTOR(16) #define SIG_SPI _VECTOR(17) #define SIG_UART0_RECV _VECTOR(18) #define SIG_UART0_DATA _VECTOR(19) #define SIG_UART0_TRANS _VECTOR(20) #define SIG_ADC _VECTOR(21) …

Example Timer 0 interrupt Timer0 Compare interrupt char status = 0; INTERRUPT(SIG_OUTPUT_COMPARE0) { if(status == 0){ TOSH_CLR_YELLOW_LED_PIN(); status = 1; }else{ TOSH_SET_YELLOW_LED_PIN(); status = 0; }

Implement Timer 0 Limitation Operation Utilize 32,768 Khz Utilize compare register Operation When turn on power, on Red LED After setting timer registers, on Green LED Whenever expire 200ms, toggle LED

Programming Timer 0 (200ms) Make new c file Includes: #include <avr/io.h>, #include <avr/signal.h>, #include <avr/interrupt.h> Search Timer registers Setting register Descript “interrupt hander” Compile with avr-gcc avr-gcc -o output -Os -mmcu=atmega128 main.c xxx.c avr-objcopy -O ihex output main.hex

Q & A

HomeWorks until 1/15 until 1/19 Implement Timer 0 example until 1/19 Implement Timer Component having 3 interfaces Use timer0 only Timer unit is ms Max timer setting value is 30000 Use C language only. Hits: refer to TimerM component in TinyOS-1.x