51单片机 – LED灯显示二进制代码进阶版

#include <reg52.h>

sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
//数码管真值表
unsigned char code LedChar[16] = {
    0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
    0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
//数码管顺时针旋转真值表
unsigned char code LedCW[6] = {
    0xF7, 0xEF, 0xDF, 0xFE, 0xFD, 0xFB
};
//数码管逆时针旋转真值表
unsigned char code LedCCW[6] = {
    0xFB, 0xFD, 0xFE, 0xDF, 0xEF, 0xF7
};
//前六个为数码管显示缓冲区，最后1个为8个LED小灯的初始值，初值0xFF确保启动时都不亮
unsigned char LedBuff[7] = {
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
bit flag1s = 0;                         //1秒定时标志
bit flag100ms = 0;                      //100ms定时标志

void main(){
    unsigned char sec = 0;              //计秒初始值
    unsigned char tempLedBuff = 0;      //8个LED小灯转换变量
    unsigned char j = 0;
    unsigned buff[3];                   //中间转换缓冲区
    signed char k = 0;
    bit flagLedDP = 0;                  //数码管小点标志位
    
    EA = 1;                             //使能总中断
    ENLED = 0;                          //使能U3
    ADDR3 = 1;                          //因为需要动态改变ADDR0-2的值，所以ADDR0-2不需要再初始化了
    TMOD &= 0x0F;                       //设置Timer1工作模式1
    TMOD |= 0x10;
    TH1 = 0xFC;                         //为Timer1赋初值0xFC67，定时1ms
    TL1 = 0x67;
    ET1 = 1;                            //使能Timer1中断
    TR1 = 1;                            //启动Timer1
        
    while(1){
        if(flag1s){                     //判断1秒定时标志
            flag1s = 0;                 //1秒定时标志清零
            flagLedDP = ~flagLedDP;     //1秒数码管小点标志位取反
            if(sec < 255){              //如果秒数小于255
                sec++;                  //秒计数自加1
                tempLedBuff++;          //LED小灯当前值自加1
            }
            else{
                sec = 0;                //秒数清零
                tempLedBuff = 0;        //LED小灯值清零
            }
        }

        if(flag100ms){                  //100ms定时位
            flag100ms = 0;              //100ms定时位清零
            if(j >= 5){                 //循环数码管旋转真值表的数组下标
                j = 0;
            }
            else{
                j++;
            }
        }
        //将sec按十进制位从低到高依次提取到buff数组中，由于sec最大只有255，所以只计算三位
        buff[0] = sec % 10;
        buff[1] = sec / 10 % 10;
        buff[2] = sec / 100 % 10;
        //从最高为开始，遇到0不显示(赋值0xFF)，遇到非0退出for循环
        for(k = 2; k >= 1; k--){
            if(buff[k] == 0){
                LedBuff[k] = 0xFF;
            }
            else{
                break;
            }
        }
        //将剩余的有效数字位如实转换，for()起始未对j操作，j即保持上个循环结束时的值
        for( ; k >= 0; k--){
            LedBuff[k] = LedChar[buff[k]];
        }
        //LED小灯当前值取反，赋给LedBuff[6]，待每1ms进定时器中断刷新显示出来。取反的原因在于每个LED小灯低电平点亮。
        LedBuff[6] = ~tempLedBuff;
        //如果flagLedDP置1了，说明1秒的时间到，在当前LedCW的元素上面与运算0x7F，点亮数码管小点
        //下一秒flagLedDP标志位置0，则直接显示当前旋转数码管的段位
        if(flagLedDP){
            LedBuff[3] = LedCW[j] & 0x7F;
            LedBuff[4] = LedCW[j] & 0x7F;
            LedBuff[5] = LedCW[j] & 0x7F;
        }
        else{
            LedBuff[3] = LedCW[j];
            LedBuff[4] = LedCW[j];
            LedBuff[5] = LedCW[j];
        }
    }
}
/* 定时器1中断服务函数 */
void interruptTimer1() interrupt 3{
    static unsigned char i = 0; 
    static unsigned int cnt = 0;
    static unsigned int ledcnt = 0;

    TH1 = 0xFC;             //重新加载初值
    TL1 = 0x67;
    cnt++;                  //中断次数计数值加1
    if(cnt >= 1000){        //中断1000次即1秒
        cnt = 0;            //清零计数值以重新开始下1秒计时
        flag1s = 1;         //设置1秒定时标志为1
    }
    ledcnt++;               //中断次数计数值加1
    if(ledcnt >= 100){      //中断100次即100ms
        ledcnt = 0;         //清零计数值以重新开始下1秒计时
        flag100ms = 1;      //设置100ms定时标志为1
    }
    //以下代码完成数码管和LED小灯的动态扫描刷新
    //这里每1ms进入中断1次，每次刷新1个段，循环完7个段位，共需要7ms
    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++; P0 = LedBuff[5]; break;
        case 6: ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; i = 0; P0 = LedBuff[6]; break;
        default: break;
    }
}