c语言门铃程序,基于AT89C2051做的音乐门铃 附程序

以下是基于AT89C2051单片机的C语言门铃程序，可以实现音乐门铃的功能：

#include <REGX51.H>

#define T0 0
#define T1 1

unsigned char code music[] = {0x0e,0x0e,0x0f,0x0f,0x10,0x10,0x0f,0x0f,0x0e,0x0e,0x0d,0x0d,0x0c,0x0c,0x0b,0x0b,0x0a,0x0a,0x09,0x09,0x08,0x08,0x07,0x07,0x06,0x06,0x05,0x05,0x04,0x04,0x03,0x03,0x02,0x02,0x01,0x01,0x00};

unsigned char cur_music = 0;
unsigned char cur_time = 0;

void timer0_interrupt() interrupt 1
{
    TH0 = 0xff;
    TL0 = 0x85;
    cur_time++;
}

void timer1_interrupt() interrupt 3
{
    unsigned char cur_note = music[cur_music];
    if(cur_note == 0x0f)
        P1 = 0x00;
    else if(cur_note == 0x0e)
        P1 = 0xff;
    else
        P1 = cur_note;
    cur_music++;
    if(cur_music >= 32)
        cur_music = 0;
}

void main()
{
    TMOD = 0x11;
    TH0 = 0xff;
    TL0 = 0x85;
    TR0 = 1;
    ET0 = 1;
    TH1 = 0xfd;
    TL1 = 0xfd;
    TR1 = 1;
    ET1 = 1;
    EA = 1;
    while(1)
    {
        if(cur_time >= 50)
        {
            cur_time = 0;
            cur_music = 0;
        }
    }
}

该程序使用了AT89C2051单片机的两个定时器，其中定时器0用于计时，定时器1用于控制门铃发声。门铃的音乐数据保存在一个数组中，每个元素表示一个音符。程序中使用定时器0来控制播放速度，每50个定时器0的中断即为一次门铃的播放。