atmega16-51单片机USART通信

#include"reg51.h" #define uchar unsigned char int count=0; uchar a=0x3f; sbit dula=P1^1; sbit wela=P1^2; sbit led=P1^0; uchar code dis[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f}; uchar buf[]={0,0,0,0}; uchar wei[]={0x7f,0xBf,0xDf,0xEf}; void delay(uchar i) { uchar b; while(i--) { for(b=40;b>0;b--); } } void display(uchar a) { uchar j; for(j=0;j<4;j++) { wela=1; dula=0; P0=wei[j]; wela=0; dula=1; P0=dis[buf[j]]; delay(10); } buf[1]=a/100; buf[2]=a%100/10; buf[3]=a%10; buf[0]=0; } void main() { TMOD=0X20; TH1=0xfd; TL1=0xfd; SCON=0X51; PCON=0X00; TR1=1; led=0; while(1) { while(RI==0) { display(a); } if(RI==1) { RI=0; a=SBUF; } display(a); } }