buhuo.c

MEGA16输入捕获功能

#include "mega16.h"
#include "delay.h"
#include "chuankou_zi.c" 

unsigned char flag=0; 
long b=0,a=0,c=0, m=0; 
void display(long w)
{xianshi(1000000/w,0); delay_ms(500);} 
  
main()
{ TIMSK|=0X20;    //TC1输入捕获中断使能
  SREG=0X80;       //全局中断开
  TIFR=0;
  TCNT1=0;
  TCCR1B=0XC2;       //输入捕获上升沿触发，8分频 ，1u秒记数一次；
  TCNT1=0; 
   }
   
   
 interrupt [6] void  ill(void)
 {a=ICR1L;
 b=(long)256*ICR1H+a;
 c=(long)(b-m);         //存放两次的差值
 m=b;                     //存放上次的值
 flag++; 
 if(flag>=2)
 {flag=0;TCNT1=0; 
 
 display(c);  
  a=0;b=0;c=0;m=0;
  }
}