pc.c

电脑和单片机进行串行通信

#include<reg52.h>
sbit P2_2=P2^2;
sbit P2_0=P2^0;
unsigned char code tab[]={0XC0,0XCF,0X64,0X46,0X4B,0X52,0X50,0XC7,0X40,0X42};
unsigned char dat;
unsigned char a;
void Init_Com(void)
{
  TMOD=0X20;
  PCON=0X00;
  SCON=0X50;
  TH1=0XFD;
  TL1=0XFD;
  TR1=1;
}

void delayms(unsigned int k) 
{
  unsigned char  i;
  while(k--)
  for(i=0;i<125;i++);
}

void display(int k)
{
  P2_2=0;
  P0=tab[k%10];
}

void serial() interrupt 4 using 1
{
  if(RI==1)
  {
   RI=0;
   dat=SBUF;
  }
}

void main()
{ 
  EA=1;
  ES=1;
  Init_Com();
  while(1)
  {
    display(dat);
	if(dat==1)
	{  P2_0=1;
	   display(dat);
	   a=0x01;
	   P1=~a; 
	   delayms(200);
	   while(a<0x80)
	   { a<<=1;
	     P1=~a; 
	     delayms(200);
		}
	}
	else if(dat==2)
	{ P2_0=1;
	  display(dat);
	  a=0x80;
	  P1=~a; 
	  delayms(200);
	  while(a>0x01)
	  { 
	    a>>=1;
	    P1=~a; 
	    delayms(200);
	  }
	}
	else if(dat==3)
	{ P2_0=1;
	  display(dat);
	  P1=0xff;
	  delayms(300);
	  P1=0x00;
	  delayms(300);
	}
	else if(dat==4)
	{ P2_0=1;
	  display(dat);
	  P1=0X00;
	}
	else if(dat==5)
	{ P2_0=1;
	  display(dat);
	  P1=0XFF;
	}
	else P2_0=0;
  }

}