cs17-1.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>
#define uchar unsigned char	
#define uint unsigned int
uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code ACT[4]={0xfe,0xfd,0xfb,0xf7};
/*************************************************************/
uchar code as[]="  Receving Data:\0";	
uchar a=0x30,b;				
//****************************************************
void init(void)				
{
				
TMOD=0x20;				
TH1=0xfd;				
TL1=0xfd;				
SCON=0x50;				
TR1=1;			
ES=1;				
EA=1;	
}			
//************************
void delay(uint k)		
{				
uint data i,j;		
	for(i=0;i<k;i++)
	{			
	for(j=0;j<121;j++){;}		
	}			
}	
//**************************************
void main(void)				
{	uchar i;			
init();		
    while(1)	
    {				
		P0=SEG7[(a-0x30)/10];		
		P2=ACT[1];		
		delay(1);	
		P0=SEG7[(a-0x30)%10];		
		P2=ACT[0];			
		delay(1);
		if(RI)		
		{
		RI=0;i=0;
		while(as[i]!='\0'){SBUF=as[i];while(!TI);TI=0;i++;}
		SBUF=b;while(!TI);TI=0;			
		EA=1;
		}
    }					
}		
//*****************************************
void serial_serve(void) interrupt 4	
{					
a=SBUF;
b=a;		
EA=0;			
}