#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;
/*****************************************
           讀按鍵輸入口子程序
******************************************/
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; //定時1ms
   TCCR0 = 0x04; //256分頻
   TIMSK = 0x02; //開定時器0溢出中斷	  
}

void Timer0OverInter(void)
{
   TCNT0 = 0xC2; //恢復定時器初值
   KeyTime++;	 //按鍵間隔時間計數器累加
   LightCount++;
   if(KeyTime == 6)	   	  	   	//取6ms的時間間隔
   {
      KeyTime=0;
	  if((Key1 == 0) && (Key2 == 1) && (Key3 == 1))  
	  //如果按鍵的前后三次狀態分別是0、1、1的話，則認為有鍵按下
	  KeyStatus=1;		//置位狀態標志								  
	  else 
	  KeyStatus=0;        //否則清0狀態標志
	  Key1=Key2;
	  Key2=Key3;
   }
   
   /*************************************************
   if(UartOverTime>0)
   {
	    UartOverTime--;
	    if(UartOverTime==0)
	    UartStatus=0;
   }
   *************************************************/
   
   if(LightCount == 1000)		//狀態燈控制
   {
      	PORTD ^= BIT(4);
   		LightCount=0;
   } 
}