atmega128 타이머 인터럽트 확인용

serialSend.c

#define F_CPU 16000000UL

#define USART_BAUDRATE 9600               										// baud rate
#define UBRR_VALUE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)	// Clock, bps to UBRR

#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>
#include <avr/interrupt.h>

volatile unsigned int count=0, num=0;

int cnt = 0;

void sendByte(uint8_t data) {
	while(!(UCSR1A & (1 << UDRE1))){};	    		// Wait for sending
	UDR1 = data;
}

void sendString(const char str[]) {
	uint8_t i = 0;
	while (str[i]) {
		sendByte(str[i]);
		i++;
	}
}

ISR(TIMER0_OVF_vect)
{
	PORTA = 0xFF;
	if (cnt > 1000) {
		char ch[10];
		sprintf(ch, "^_^ %d", cnt);
		sendString(ch);
		cnt = 0;
	} else {
		cnt++;
	}
	PORTA = 0xFE;
}

void initUART()
{
	// 16bit UBRRn - Split by each 8bit
	UBRR1H = (uint8_t)(UBRR_VALUE>>8);
	UBRR1L = (uint8_t) UBRR_VALUE;
	
	UCSR1C |=  (1 << UCSZ10) | (1 << UCSZ11);	// Data bit - 8bit
	UCSR1C &= ~((1 << UPM11) | (1 << UPM10));	// Parity bit - none
	UCSR1C &= ~(1 << USBS1);		        		// stop  bit - 1bit
	
	UCSR1B=(1 << RXEN1) | (1 << TXEN1);		      	// Enable send, receive
}

int main(void)
{
	DDRA = 0xFF;
	PORTA = 0xFF;

	initUART();

	TCCR0 = (0<<WGM01)|(0<<WGM01)|(0<<CS02)|(1<<CS01)|(1<<CS00);
	TCNT0 = 6;
	TIMSK = (0<<OCIE0)|(1<<TOIE0);
	sei();

	unsigned int k = 20;
	while(k != 0)
	{
		
		_delay_ms (250);
	}
}