1. Microcontroller Programming
(주)한백전자

2. Atmega128

3. 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

4. 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

5. Atmega 128’ GPIO

6. ZigbeX MCU Circuit

7. LED Circuit

8. 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

9. Implement 3 LED on

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

11. Timer Interrupt 1
Overflow Interrupt

12. Timer Interrupt 2
Compare Interrupt

13. Atmega 128 interrupt #define SIG_INTERRUPT0 _VECTOR(1)
#define SIG_OUTPUT_COMPARE2 _VECTOR(9)
#define SIG_OVERFLOW _VECTOR(10)
#define SIG_INPUT_CAPTURE _VECTOR(11)
#define SIG_OUTPUT_COMPARE1A _VECTOR(12)
#define SIG_OUTPUT_COMPARE1B _VECTOR(13)
#define SIG_OVERFLOW _VECTOR(14)
#define SIG_OUTPUT_COMPARE0 _VECTOR(15)
#define SIG_OVERFLOW _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) …

14. 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; }

15. 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

16. 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

17. Q & A

18. 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