最新消息:

51单片机 – 同时点亮KST-51开发板的8×8点阵,LED数码管和LED小灯

51单片机 163浏览 0评论

效果展示:

本程序代码为《手把手教你学51单片机》7.6的课后练习题6,并且已经在KST-51 v1.3.2开发板验证通过。

#include <reg52.h>

sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;

//点阵数码管图片帧
unsigned char code images[6][8] = {
    {0x00,0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x00},  //8x8点阵从外圈数第1圈显示的图片帧
    {0xFF,0x81,0xBD,0xBD,0xBD,0xBD,0x81,0xFF},  //8x8点阵从外圈数第2圈显示的图片帧
    {0xFF,0xFF,0xC3,0xDB,0xDB,0xC3,0xFF,0xFF},  //8x8点阵从外圈数第3圈显示的图片帧
    {0xFF,0xFF,0xFF,0xE7,0xE7,0xFF,0xFF,0xFF},  //8x8点阵从外圈数第4圈显示的图片帧
    {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},  //8x8点阵全部不显示的图片帧
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}   //8x8点阵全部显示的图片帧
};
//数码管数值真值表
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
};
//数码管显示缓冲区
unsigned char LedBuff[7] = {
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
bit flag1s = 0;                             //1s标志位
bit flag50ms = 0;                           //50s标志位
bit flag100ms = 0;                          //100ms标志位
bit flag3s = 0;                             //3s标志位
unsigned char index = 0;                    //图片帧索引变量
bit flagcyclecnt = 0;                       //图片循环次数标志位

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 buff[3];                  //中间转换缓冲区
    signed char i = 0;
    unsigned char j = 0;
    bit flagLedDP = 0;                      //数码管小点标志位
    bit dir = 1;                            //图片帧播放方向变量
    unsigned char cyclecnt = 0;             //图片帧播放次数变量

    EA = 1;                                 //使能总中断
    ENLED = 0;                              //使能LED
    TMOD &= 0xF0;                           //设置Timer0工作模式1
    TMOD |= 0x01;
    TH0 = 0xFC;                             //为Timer0赋初值0xFC67,定时1ms
    TL0 = 0x67;
    ET0 = 1;                                //使能Timer0中断
    TR0 = 1;                                //启动Timer0

    while(1){
        if(flag1s){                         //1s标志位
            flag1s = 0;                     //1s标志位清零
            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++;
            }
        }

        if(flag50ms){                       //50ms定时位
            flag50ms = 0;                   //50ms定时位清零
            if(dir){                        //如果dir = 1
                index++;                    //图片帧播放索引每次加1,图片帧正向播放
                if(index >= 4){             //图片帧播放到第4帧
                    dir = 0;                //dir置0
                }
            }
            else{                           //如果dir = 0,图片帧索引每次减1,图片反向播放
                index--;
                if(index <= 0){             //图片索引播放到第0帧
                    dir = 1;                //dir置1
                    cyclecnt++;             //循环播放变量加1,也就是说正向播放后又反向播放了1次后加1。
                }
            }
            if(cyclecnt >= 5){              //如果图片帧循环播放了5次
                    index = 5;              //图片播放第5帧,即LED点阵全部点亮
                    flagcyclecnt = 1;       //图片循环次数标志位置1
                if(flag3s){                 //3s定时位
                    flag3s = 0;             //3s定时位清零
                    index = 0;              //图片帧索引清零
                    cyclecnt = 0;           //图片帧播放次数清零
                    flagcyclecnt = 0;       //图片循环次数标志位置清零
                    dir = 1;                //dir置1
                }
            }
        }
        //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(i = 2; i >= 1; i--){
            if(buff[i] == 0){
                LedBuff[i] = 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( ; i >= 0; i--){
            LedBuff[i] = LedChar[buff[i]];
        }
        //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];
        }
        //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;
    }
}
/* 定时器1中断服务函数 */
void interruptTimer0() interrupt 1{
    static unsigned int cnt_1 = 0;
    static unsigned int cnt_2 = 0;
    static unsigned int cnt_3 = 0;
    static unsigned int cnt_4 = 0;
    static unsigned char i = 0;

    TH0 = 0xFC;                 //重新加载初值
    TL0 = 0x67;

    cnt_1++;
    if(cnt_1 >= 1000){
        cnt_1 = 0;
        flag1s = 1;
    }
    cnt_2++;
    if(cnt_2 >= 100){
        cnt_2 = 0;
        flag100ms = 1;
    }
    cnt_3++;
    if(cnt_3 >= 50){
        cnt_3 = 0;
        flag50ms = 1;
    }
    if(flagcyclecnt){           //图片循环次数标志位置1
        cnt_4++;                //进入中断次数cnt_4开始自加1
        if(cnt_4 >= 3000){      //进入中断3000次,即3s
            cnt_4 = 0;          //进去中断次数cnt_4清零
            flag3s = 1;         //3s标志位置1
        }
    }
    //以下代码完成8x8点阵,数码管和LED小灯的动态扫描刷新
    P0 = 0xFF;          //显示消隐
    switch(i){
        case 0: ADDR3 = 1; ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; i++; P0 = LedBuff[0]; break;
        case 1: ADDR3 = 1; ADDR2 = 0; ADDR1 = 0; ADDR0 = 1; i++; P0 = LedBuff[1]; break;
        case 2: ADDR3 = 1; ADDR2 = 0; ADDR1 = 1; ADDR0 = 0; i++; P0 = LedBuff[2]; break;
        case 3: ADDR3 = 1; ADDR2 = 0; ADDR1 = 1; ADDR0 = 1; i++; P0 = LedBuff[3]; break;
        case 4: ADDR3 = 1; ADDR2 = 1; ADDR1 = 0; ADDR0 = 0; i++; P0 = LedBuff[4]; break;
        case 5: ADDR3 = 1; ADDR2 = 1; ADDR1 = 0; ADDR0 = 1; i++; P0 = LedBuff[5]; break;
        case 6: ADDR3 = 1; ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; i++; P0 = LedBuff[6]; break;

        case 7: ADDR3 = 0; ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][0]; break;
        case 8: ADDR3 = 0; ADDR2 = 0; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][1]; break;
        case 9: ADDR3 = 0; ADDR2 = 0; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][2]; break;
        case 10: ADDR3 = 0; ADDR2 = 0; ADDR1 = 1; ADDR0 = 1; i++; P0 = images[index][3]; break;
        case 11: ADDR3 = 0; ADDR2 = 1; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][4]; break;
        case 12: ADDR3 = 0; ADDR2 = 1; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][5]; break;
        case 13: ADDR3 = 0; ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][6]; break;
        case 14: ADDR3 = 0; ADDR2 = 1; ADDR1 = 1; ADDR0 = 1; i = 0; P0 = images[index][7]; break;
        default: break;
    }
}

您必须 登录 才能发表评论!