對於過去兩週幫我努力學習計時器&中斷&寫了一個程序(我的理解)閃爍的ATMEGA2560的LED,但無論我做什麼TCNT0從未遞增& ISR()函數不會被調用。我在哪裏出錯了,我該如何解決?這裏是我的代碼:需要用定時器
#include<avr/io.h>
#include<avr/interrupt.h>
#define READ_ATMEGA(ADDR) *((P_CHAR)(BASE_ADDR + ((ADDR) * ADDR_MULTIPLIER)))
#define WRITE_ATMEGA(ADDR, DATA) *((P_CHAR)(BASE_ADDR + ((ADDR) * ADDR_MULTIPLIER))) = DATA
#define BASE_ADDR 0x20
void init_timer0_ovf_interrupt(void);
void timer0_interrupt_isr(void);
void initialize_ports(void);
void delay(unsigned int no_65_5ms_interrupts);
void __attribute__((ISR)) timer0_interrupt_isr(void);
//#pragma interrupt_handler timer0_interrupt_isr:24
unsigned int delay_timer;
int main(void)
{
initialize_ports();
init_timer0_ovf_interrupt();
delay(46);
return 0;
}
void initialize_ports(void)
{
READ_ATMEGA(4) = 0xff;
WRITE_ATMEGA(5, 0x00);
}
void delay(unsigned int no_65_5ms_interrupts)
{
TCNT0 = 0x00;
delay_timer = 0;
while(delay_timer <= no_65_5ms_interrupts)
{
;
}
}
void init_timer0_ovf_interrupt(void)
{
TCCR0A = 0X00;
TCCR0B = 0x02;
TIMSK0 = 0x01;
TIFR0 = 1<<0;
OCR0A = 25;
sei();
}
void timer0_interrupt_isr(void)
{
delay_timer++;
if(delay_timer >= OCR0A)
{
PORTB = ~(PORTB);
delay_timer = 0;
}
}
僅供參考要格式化代碼塊,請選擇它並單擊代碼按鈕;看起來像二進制數字的那個。 – meagar 2010-11-04 17:40:46
當然,謝謝你的信息。 – sneezy 2010-11-04 18:11:34