part2.1_3.c

新概念51单片机C语言教程.入门、提高、开发

#include <reg52.h>    		//52系列单片机头文件
#define uchar unsigned char
#define uint unsigned int 
sbit dula=P2^6;		//申明U1锁存器的锁存端
sbit wela=P2^7;	 //申明U2锁存器的锁存端
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delayms(uint xms);

void main()
{
    while(1)
	{
	    dula=1;
		P0=table[1];  //送段选数据
		dula=0;
		P0=0xff;		 
		wela=1;
		P0=0xfe;
		wela=0;
		delayms(10);


		dula=1;
		P0=table[2];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xfd;		 
		wela=0;
		delayms(10);  

		dula=1;
		P0=table[3];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xfb;		 
		wela=0;
		delayms(10);
			
		dula=1;
		P0=table[4];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xf7;		 
		wela=0;
		delayms(10);
				
		dula=1;
		P0=table[5];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xef;		 
		wela=0;
		delayms(10);
		  			
		dula=1;
		P0=table[6];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xdf;		 
		wela=0;
		delayms(10);
		
		dula=1;
		P0=table[7];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0xbf;		 
		wela=0;
		delayms(10);

		dula=1;
		P0=table[8];  
		dula=0;
		P0=0xff;
		wela=1;
		P0=0x7f;		 
		wela=0;
		delayms(10);



 


 





	}
}  

 void delayms(uint xms)				
{
	uint i,j;
	for(i=xms;i>0;i--)		      //i=xms即延时约xms毫秒
		for(j=110;j>0;j--);
}