51单片机简易电子琴代码

以下是一个简单的51单片机电子琴代码：

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit beep=P1^7; //定义P1.7口为发声口

uchar code table[]={0xe7,0xe5,0xe3,0xe2,0xdf,0xdc,0xda,0xd8,0xd7,0xd5,0xd4,0xd2,0xd1,0xcf,0xcd,0xcc,0xca,0xc9,0xc7,0xc6,0xc5,0xc4,0xc3,0xc2,0xc1,0xc0,0xbf,0xbe,0xbe,0xbd,0xbc,0xbc,0xbb,0xba,0xba,0xb9,0xb8,0xb8,0xb7,0xb6,0xb6,0xb5,0xb4,0xb4,0xb3,0xb2,0xb2,0xb1,0xb0,0xb0,0xaf,0xae,0xae,0xad,0xac,0xac,0xab,0xaa,0xaa,0xa9,0xa8,0xa8,0xa7,0xa6,0xa6,0xa5,0xa4,0xa4,0xa3,0xa2,0xa2,0xa1,0xa0,0xa0,0x9f,0x9e,0x9e,0x9d,0x9c,0x9c,0x9b,0x9a,0x9a,0x99,0x98,0x98,0x97,0x96,0x96,0x95,0x94,0x94,0x93,0x92,0x92,0x91,0x90,0x90,0x8f,0x8e,0x8e,0x8d,0x8c,0x8c,0x8b,0x8a,0x8a,0x89,0x88,0x88,0x87,0x86,0x86,0x85,0x84,0x84,0x83,0x82,0x82,0x81,0x80}; //定义音符频率表

void delay(uint t) //延时函数
{
    uint i,j;
    for(i=0;i<t;i++)
        for(j=0;j<125;j++);
}

void main()
{
    uchar i;
    while(1)
    {
        for(i=0;i<100;i++) //循环演奏100个音符，可根据需要修改
        {
            beep=1; //发声
            P0=table[i]; //输出音符频率
            delay(2); //持续时间，可根据需要修改
            beep=0; //停止发声
            delay(2); //发声间隔，可根据需要修改
        }
    }
}

这个代码使用P1.7口作为发声口，通过P0口输出音符频率，使用table数组存储了88个钢琴键的频率，控制发声时长和发声间隔的时间可以根据需要进行修改。