两机串行通讯

/***************   writer:shopping.w   ******************/
#include
#define uint unsigned int
#define uchar unsigned char
sbit LED1 = P1^0;
sbit LED2 = P1^3;
sbit K1 = P1^7;
uchar Operation_NO = 0;
uchar code DSY_CODE[]=
{
  0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f
};

void Delay(uint x)
{
  uchar i;
 while(x--)
 {
   for(i=0;i<120;i++);
 }
}

void putc_to_SerialPort(uchar c)
{
  SBUF = c;
 while(TI == 0);
 TI = 0;
}

void main()
{
  LED1=LED2=1;
 P0 = 0x00;
 SCON = 0x50;
 TMOD = 0x20;
 PCON = 0x00;
 TH1  = 0xfd;
 TL1  = 0xfd;
 TI   = 0;
 RI   = 0;
 TR1  = 1;
 IE   = 0x90;
 while(1)
 {
   Delay(100);
  if(K1 == 0)
  {
    while(K1==0);
   Operation_NO=(Operation_NO+1)%4;
   switch(Operation_NO)
   {
     case 0:
      putc_to_SerialPort('X');
      LED1=LED2=1; break;
    case 1:
      putc_to_SerialPort('A');
      LED1=0;LED2=1;break;
    case 2:
      putc_to_SerialPort('B');
      LED2=0;LED1=1;break;
    case 3:
      putc_to_SerialPort('C');
      LED1=0;LED2=0;break;
   }
  }
 }
}

void Serial_INT() interrupt 4
{
  if(RI)
 {
   RI = 0;
  if(SBUF>=0&&SBUF<=9)
   P0 = DSY_CODE[SBUF];
  else 
   P0 = 0x00;
 }
}