main.c

ps/2鼠标和键盘的协议

#include <Reg51.h>
#include <stdio.h>


sbit Data = P0^0;
unsigned char data start;
unsigned char data databuff;
unsigned char data result;

void main(void)
{
  /***************************

      串行通讯的波特率根据实际应用再修改

*********************************/
  PCON = 0x80;        //SMOD = 1
  SCON = 0x50;        //串口通讯采用方式1  
  TMOD = 0x20;        //T1采用方式2
  TL1 = 0xfd;
  TH1 = 0xfd;         //T1装初值
  ES = 1;             //开串口中断
  ET1 = 1;            //开T1中断
  IT0 = 1;            //中断0负边沿触发
  EX0 = 1;            //开外部中断0
  EA = 1;             //开所有中断
  TR1 = 1;            //T1开始计时
  start = 0xff;
  databuff = 0;
 // for(;;);
}

void interrupter_0(void) interrupt 0 using 1
{
  if( start == 0xff )       
  {
    if(Data == 0)          //开始接受起始位
	{
	  start = 0;
	  databuff = 0;
	}
  }
  else
  {
    if(start < 0x08)       //接受数据位
	{
	  if( Data == 1)
	    databuff += (1 << start);
	}
	else if( start == 0x08)   //接受校验位
	{
	 
	}
	else                     //接受停止位
	{
	  start = 0xff;
	  if( Data == 1)
	  {
	    result = databuff;
		SBUF = result;      //向上位机发送数据
	  }
	  else
	    result = 0xff;
	}
	start ++;
  }
}

void serial(void) interrupt 4 using 2
{
  if( TI == 1 )
    TI = 0;
  if( RI == 1 )
    RI = 0;
}