#include <at89s52.h>
#include <stdio.h>
#include <per.h>
#include <intrins.h>

extern unsigned char MS[BUFFNUM+1];//
//extern bit receive_flag;
//extern bit first_receive_b;
//extern bit receive_time_begin_b;
//extern unsigned char receive_time;
//extern unsigned char interrupt_times;
//unsigned char px,sum_temp;
//extern bit send_flag;
extern bit SomeKeyEnableFlag,SomeKeyKeepFlag;
extern unsigned char SomeKeyKeepTime;
extern bit ReadKeyOnceFlag;

extern unsigned char DatTemp1,DatTemp2,DatTemp11,DatTemp22;
unsigned int time;
extern unsigned char KeyWobbleTime;
extern bit   NewKeyFlag;
extern unsigned char makecode;
extern unsigned char KeyT;
extern unsigned int testtime;

void INT_S(void)  interrupt S_VECTOR
 {
//設計思想:當接收第一個數據時,判斷是否是本機的地址數據,如果不是,SM2=1，因主機后來數據的TB8=0，數據再不會接收，除非主機發送新的一楨；//
//如果是本機地址，SM2=0,開始計時，保證6ms內把數據接收完，否則接受數據全部清除//
   unsigned char dat_temp;
   if(RI)
     {
	  RI=0;
	  dat_temp=SBUF;
	 }
	else if(TI)
	 {
	   TI=0;
	  }
 }
void INT_TO()interrupt TI0_VECTOR//1ms interrupt 
{
  TL0=T0_L;
  TH0=T0_H;
  if(KeyT>0)
    KeyT--;
 // if(testtime>0)
 //   testtime--;
//===============鍵盤掃描
  if(KeyT==0)
   {
  if(!ReadKeyOnceFlag)
    { 
          P1|=0x3f;//P10,P11,P12,P13,P14,P15口線置高
          P2=0;//P2口拉低
          DatTemp11=P1&0x3f;//讀取P10,P11,P12,P13,P14,P15口狀態
          //if(DatTemp11==0x3f)
          //   NewKeyFlag=0;//取消上次按鍵標志
          P2=0xff;//把P2口拉高
          P1&=0xc0;//P10,P11,P12,P13,P14,P15口線拉低
 	      DatTemp22=P2;//讀取P2口狀態
          //if(DatTemp22==0xff)
          //   NewKeyFlag=0;//取消上次按鍵標志
          P1|=0x3f;//P10,P11,P12,P13,P14,P15口線置高
          //20ms去抖動處理
          if((DatTemp1==DatTemp11)&&(DatTemp2==DatTemp22))
            {//兩次讀取的值相同
			  if(KeyWobbleTime<30)
                   KeyWobbleTime++;
              if((!NewKeyFlag)&&(KeyWobbleTime>=20))//20ms
                {
                   ReadKeyOnceFlag=1;//建立一次成功讀取開關標志
                   NewKeyFlag=1;//本次按鍵標志
                }
            }
          else
            {//兩次讀取的值不同，可能是抖動，也可能是新的按鍵出現
               DatTemp1=DatTemp11;
               DatTemp2=DatTemp22;
               KeyWobbleTime=0;//重新開始抖動計時
			   NewKeyFlag=0;//取消上次按鍵標志
            }
    }
    }
}
void INT_T1()interrupt TI1_VECTOR//20ms interrupt 
{
  TL1=T1_L;
  TH1=T1_H;
  if(SomeKeyKeepFlag)
   {
     SomeKeyKeepTime++;
   }
}