请教关于ATMEL ATtiny45定时器1的问题

只看该作者 · 2018-12-21 16:49

我为了使用ATtiny45定时器1作每秒1000HZ的定时中断，编了以下程序，可是运行不了，想了好久也想不出解决的方法。请各位高手指导，看看问题出在哪里？
#include <tiny45.h>

#define uchar unsigned char
#define uint unsigned int

#define led PORTB.0
#define LED_ON 0
#define LED_OFF 1

uint mark = 0;

// Timer1 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
// Reinitialize Timer1 value
TCNT1=0x64;
// Place your code here
mark++;
}

void main(void)
{
PORTB=0x03;
DDRB=0x01;

// Timer/Counter 1 initialization
PLLCSR=0x00;

TCCR1=0x01;
GTCCR=0x00;
TCNT1=0x64;
OCR1A=0x00;
OCR1B=0x00;
OCR1C=0x00;

// Interrupt(s) initialization
TIMSK=0x04;

while(1)
{
      if(mark==500)
         led = LED_ON;
      if(mark==1000)
         led = LED_OFF;
      mark = 0;
}
}

只看该作者 · 2018-12-25 11:59

没用过ATMEL，看了10分钟的文档，貌似你的SREG 全局中断没开！！！
还有养成“进中断，清中断”的习惯，虽然这货是硬件清除的FLAG。
When the SREG I-bit, and TOIE1 (Timer/Counter1 Overflow Interrupt Enable), and TOV1 are set(one), the Timer/Counter1 Overflow interrupt is executed.