timer.c

MCU：ATMEGA8515 Frequence: 16M 描述：利用已有CAN TEST V1.0电路板进行调试, 可靠性测试已通过

#include "iom8515v.h"
#include "macros.h"
#include "MAIN.h"


#pragma interrupt_handler Timer0OverInter:8
uint LightCount=0;
uchar KeyTime=0;
uchar Key1,Key2,Key3;
uchar KeyStatus=0;
/*****************************************
           读按键输入口子程序
******************************************/
uchar  KeyInput(uchar BitData)
{
    uchar KeyData;
	KeyData=(PIND &= (1 << BitData ));
	if(KeyData == 0)
	return(1);
	else
	return(0);
}

void Timer0Ini(void) 
{
   TCCR0 = 0x00; 
   TCNT0 = 0xC2; //定时1ms
   TCCR0 = 0x04; //256分频
   TIMSK = 0x02; //开定时器0溢出中断	  
}

void Timer0OverInter(void)
{
   TCNT0 = 0xC2; //恢复定时器初值
   KeyTime++;	 //按键间隔时间计数器累加
   LightCount++;
   if(KeyTime == 6)	   	  	   	//取6ms的时间间隔
   {
      KeyTime=0;
	  if((Key1 == 0) && (Key2 == 1) && (Key3 == 1))  
	  //如果按键的前后三次状态分别是0、1、1的话，则认为有键按下
	  KeyStatus=1;		//置位状态标志								  
	  else 
	  KeyStatus=0;        //否则清0状态标志
	  Key1=Key2;
	  Key2=Key3;
   }
   
   /*************************************************
   if(UartOverTime>0)
   {
	    UartOverTime--;
	    if(UartOverTime==0)
	    UartStatus=0;
   }
   *************************************************/
   
   if(LightCount == 1000)		//状态灯控制
   {
      	PORTD ^= BIT(4);
   		LightCount=0;
   } 
}