ATMega8 Watchdog测试程序

#include
#include
#include

#define uchar unsigned char
#define uint unsigned int

#define SET_LEDPORTB&=0XFE //PB0接黄色发光管

#define CLR_LED PORTB|=0X01


//误差不会太大的延时1ms函数
void DelayMs(uint ms)
{
uint i;
for(i=0;i _delay_loop_2(4 *250);
}

int main(void)
{
DDRB=_BV(PB0);
PORTB=_BV(PB0); //CLR_LED
//WDT计数器同期为一秒
wdt_enable(WDTO_1S);
wdt_reset();//喂狗

DelayMs(500);

SET_LED;

//等待饿死狗
DelayMs(5000);

SET_LED;
while(1)
wdt_reset();
}