基于51单片机的音乐播放器

基于51单片机的音乐播放器主要包括以下功能：
1. 采用LCD1602液晶显示当前时间/播放曲目信息。
2. 按键设置时间，切换/暂停曲目。
3. 内置8首歌曲，本设计采用了优质的外放喇叭，声音清晰、洪亮。
4. 采用DC002作为电源接口可直接输入5V给整个系统供电。

以下是一个基于51单片机的音乐播放器的代码示例：

#include <reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit K1 = P3 ^ 2; // 按键1
sbit K2 = P3 ^ 3; // 按键2
sbit K3 = P3 ^ 4; // 按键3
sbit K4 = P3 ^ 5; // 按键4

sbit LSA = P2 ^ 2; // 数码管A
sbit LSB = P2 ^ 3; // 数码管B
sbit LSC = P2 ^ 4; // 数码管C
sbit LSK = P2 ^ 5; // 数码管K

uchar code table[] = { // 数码管显示0~9
    0xc0, 0xf9, 0xa4, 0xb0, 0x99,
    0x92, 0x82, 0xf8, 0x80, 0x90
};

uchar code music[] = { // 内置8首歌曲
    0x01, 0x02, 0x03, 0x04,
    0x05, 0x06, 0x07, 0x08
};

uchar time[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; // 时间数组
uchar music_index = 0; // 当前播放的歌曲索引
bit music_play = 0; // 是否正在播放音乐

void delay(uint z) { // 延时函数
    uint x, y;
    for (x = z; x > 0; x--)
        for (y = 110; y > 0; y--);
}

void display_time() { // 显示时间
    uchar i;
    for (i = 0; i < 8; i++) {
        switch (i) {
            case 2:
            case 5:
                P0 = table[10];
                break;
            default:
                P0 = table[time[i]];
                break;
        }
        switch (i) {
            case 0:
                LSA = 0;
                LSB = 0;
                LSC = 0;
                break;
            case 1:
                LSA = 1;
                LSB = 0;
                LSC = 0;
                break;
            case 2:
                LSA = 0;
                LSB = 1;
                LSC = 0;
                break;
            case 3:
                LSA = 1;
                LSB = 1;
                LSC = 0;
                break;
            case 4:
                LSA = 0;
                LSB = 0;
                LSC = 1;
                break;
            case 5:
                LSA = 1;
                LSB = 0;
                LSC = 1;
                break;
            case 6:
                LSA = 0;
                LSB = 1;
                LSC = 1;
                break;
            case 7:
                LSA = 1;
                LSB = 1;
                LSC = 1;
                break;
        }
        delay(1);
        LSK = 0;
        delay(1);
        LSK = 1;
    }
}

void play_music() { // 播放音乐
    music_play = 1;
    while (music_play) {
        P1 = music[music_index];
        delay(500);
        P1 = 0x00;
        delay(500);
    }
}

void main() {
    EA = 1; // 开启总中断
    TMOD = 0x01; // 定时器0工作在模式1
    TH0 = 0x4c; // 定时器0初值
    TL0 = 0x00;
    ET0 = 1; // 开启定时器0中断
    TR0 = 1; // 启动定时器0
    while (1) {
        if (!K1) { // 按键1设置时间
            time[0]++;
            if (time[0] == 24)
                time[0] = 0;
            while (!K1);
        }
        if (!K2) { // 按键2设置时间
            time[1]++;
            if (time[1] == 60)
                time[1] = 0;
            while (!K2);
        }
        if (!K3) { // 按键3播放音乐
            music_play = !music_play;
            if (music_play)
                play_music();
            while (!K3);
        }
        if (!K4) { // 按键4切换歌曲
            music_index++;
            if (music_index == 8)
                music_index = 0;
            while (!K4);
        }
    }
}

void timer0() interrupt 1 { // 定时器0中断
    TH0 = 0x4c;
    TL0 = 0x00;
    time[7]++;
    if (time[7] == 100) {
        time[7] = 0;
        time[6]++;
        if (time[6] == 60) {
            time[6] = 0;
            time[5]++;
            if (time[5] == 60) {
                time[5] = 0;
                time[4]++;
                if (time[4] == 24) {
                    time[4] = 0;
                    time[3]++;
                    if (time[3] == 60) {
                        time[3] = 0;
                        time[2]++;
                        if (time[2] == 60) {
                            time[2] = 0;
                            time[1]++;
                            if (time[1] == 60) {
                                time[1] = 0;
                                time[0]++;
                                if (time[0] == 24)
                                    time[0] = 0;
                            }
                        }
                    }
                }
            }
        }
    }
    display_time();
}