4.c

上传一些

//波特率改为4800，要不会出现数据丢失
#include<reg52.h>
#define uchar unsigned char
char a,b,c,d,e,j,k,shu[5],shuzi,m;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay()
{
  for(j=10;j>0;j--)
    for(k=10;k>0;k--);
}
	
void display(char a,char b,char c,char d,char e)
		{
			P0=table[a];
			dula=1;
         dula=0;
         P0=0xfe;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
		
			P0=table[b];
			dula=1;
         dula=0;
         P0=0xfd;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
		
			P0=table[c];
			dula=1;
         dula=0;
         P0=0xfb;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
			
			P0=table[d];
			dula=1;
         dula=0;
         P0=0xf7;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
		
			P0=table[e];
			dula=1;
         dula=0;
         P0=0xef;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
				
		
	}
void main()
	{
		EA=1;
		ES=1;	
		TMOD=0x20;
		PCON=0x00;
		SCON=0X50;
		TH1=0xfa;
		TL1=0xfa;
		TR1=1;
		
		while(1)
			{
					while(RI==0)	
						{;
						}                
					RI=0;			
					a=SBUF; 
					SBUF=a;		
					while(TI==0)   
					{  ;  }       
					TI=0;	//以下时间长了，以后的数据接收不收不到到，delay越长，越是前面的时间接收不到
  
					a=a-48;
					shu[shuzi++]=a;
					while(shuzi==5)
					{
						if(RI) {shuzi=0;break;}
						display(shu[0],shu[1],shu[2],shu[3],shu[4]);
					}	
			}	
	}