digitallight.c

来自「共有四个例子」· C语言 代码 · 共 40 行

//8个数码管轮流显示0-9
#include "reg51.h"

//管脚定义 74HC138（3-8）译码器输入控制信号线
sbit p10 = P1^0;
sbit p11 = P1^1;
sbit p12 = P1^2;

unsigned char table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //共阴数码管 0-9 表

void delay(unsigned int n);
void main(void)
{
	int i;
	unsigned char j;
	i=0;
	j=0;
	while(1)
	{
		p10 = j&0x01;
		p11 = (j&0x02)>>1;
		p12 = (j&0x04)>>2;
		j++;
		if(j>=8) j=0;
		P2 = table[i];
 	   	i++;
		if(i>=10) i=0;
		delay(500);
	}
}
void delay(unsigned int n)
{
	unsigned int i,j;
	i=n;
	while(i--){		
		j=255;
		while(j--); 
	}	
}