单片机程序之三，数码管显示0-9自检

#include

#include

unsigned char data dis_digit;

unsigned char code dis_code[11] =

{0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xFF}; //共阳极数码管

unsigned char data dis_buf[10];

unsigned char data dis_index;

unsigned char i = 0, j = 0;

void main(void)

{

unsigned char i;

P0 = 0xFF;

P2 = 0xFF;

TMOD = 1;

TH0 = 0xFC;

TL0 = 0x17;

IE = 0x82;

for(i=0;i<=9;i++)

{

dis_buf[i] = dis_code[i];

}

dis_digit = 0xFE;

dis_index = 0;

TR0 = 1;

while(1);

}

void timer0() interrupt 1

//定时器0中断服务程序, 用于数码管的动态扫描

//dis_index--显示索引, 用于标识当前显示的数码管和缓冲区的偏移量

//dis_gigit--位选通道, 传送到P2口用于选通当前数码管的数值, 如为0xFE时选通P2.0口数码管

//dis_buf--显示缓冲区基地址

{

TH0 = 0xFC;

TL0 = 0x17;

P2 = 0xFF; //先关闭所有数码管

P0 = dis_buf[dis_index];

P2 = dis_digit;

dis_digit = _crol_(dis_digit, 1); //位选通道左移, 下次中断时选通下一位数码管

i++;

//最简单的延时之后换显示内容

if (i==100)

{

j++;

i = 0;

if (j == 5)

{

dis_index++;

if (dis_index == 10)

{

dis_index = 0;

}

i = 0;

j = 0;

}

}

//dis_index &= 0x07; //8个数码管全部扫描完, 重新开始

}