单片机 之基于中断带消隐的数码管动态显示示例
#include <reg52.h>sbit ADDR0 = P1^0;sbit ADDR1 = P1^1;sbit ADDR2 = P1^2;sbit ADDR3 = P1^3;sbit ENLED = P1^4;unsigned char code LedChar[] = { //数码管显示字符转换表 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E};unsigned char LedBuff[6] = { //数码管显示缓冲区，初值0xFF确保启动时都不亮 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};unsigned char i = 0; //动态扫描的索引unsigned int cnt = 0; //记录T0中断次数void main(){ unsigned long sec = 0; //记录经过的秒数 EA = 1; //使能总中断 ENLED = 0; //使能U3，选择控制数码管 ADDR3 = 1; //因为需要动态改变ADDR0-2的值，所以不需要再初始化了 TMOD = 0x01; //设置T0为模式1 TH0 = 0xFC; //为T0赋初值0xFC67，定时1ms TL0 = 0x67; ET0 = 1; //使能T0中断 TR0 = 1; //启动T0 while (1) { if (cnt >= 1000) //判断T0溢出是否达到1000次 { cnt = 0; //达到1000次后计数值清零 sec++; //秒计数自加1 //以下代码将sec按十进制位从低到高依次提取并转为数码管显示字符 LedBuff[0] = LedChar[sec%10]; LedBuff[1] = LedChar[sec/10%10]; LedBuff[2] = LedChar[sec/100%10]; LedBuff[3] = LedChar[sec/1000%10]; LedBuff[4] = LedChar[sec/10000%10]; LedBuff[5] = LedChar[sec/100000%10]; } }}/* 定时器0中断服务函数 */void InterruptTimer0() interrupt 1 //1-计算公式 x*8+3=中断向量 转10进制值 0x000B =11 x=1 即 TO中断号 1#{ TH0 = 0xFC; //重新加载初值 TL0 = 0x67; cnt++; //中断次数计数值加1 //以下代码完成数码管动态扫描刷新 P0 = 0xFF; //显示消隐 switch (i) { case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=LedBuff[0]; break; case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=LedBuff[1]; break; case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=LedBuff[2]; break; case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=LedBuff[3]; break; case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=LedBuff[4]; break; case 5: ADDR2=1; ADDR1=0; ADDR0=1; i=0; P0=LedBuff[5]; break; default: break; }}