digitallight.c

共有四个例子

//第一个数码管显示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;

/*
     1
   ----
   |   |
 6 | 7 | 2
   ----
   |   |
 5 |   | 3
   ----   .DP
    4
0: 00111111=0x3F
1: 00000110=0x06
2: 01011011=0x5B

*/
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;
	while(1)
	{
		p10 = 0;
		p11 = 0;
		p12 = 0;
		for(i=0;i<10;i++)
		{
			P2 = table[i]; 
			delay(500);
		}
	}
}
void delay(unsigned int n)
{
	unsigned int i,j;
	i=n;
	while(i--){		
		j=255;
		while(j--); 
	}	
}