51单片机实现简易升降调电子琴

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51单片机实现简易升降调电子琴

//========================================================= // 电子琴，4x4矩阵按键 //========================================================= #include "reg52.h" #include #define uchar unsigned char #define uint unsigned int #define KEY_PORT P1 //矩阵键盘端口 sbit LSA=P2^2; //138译码器引脚 sbit LSB=P2^3; sbit LSC=P2^4; sbit buzz=P2^5; //蜂鸣器 uchar key; //键值 uchar tone=0; //音符 uchar scale=2; //音阶 uchar index; //序号 uchar code tab[]={ //共阴数码管段码表 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; uint code table[]={ //这个数组里存放的是1-7的音调的初始值 // 1 2 3 4 5 6 7 //音符 0xf88c,0xf95c,0xfa14,0xfa6c,0xfb04,0xfb90,0xfc0c, 0xfc44,0xfcab,0xfd09,0xfd34,0xfd82,0xfdc8,0xfe06, 0xfe22,0xfe56,0xfe8c,0xfe9a,0xfec1,0xfee4,0xff03 }; //=========================函数声明======================== void delayms(uint t); //延时函数 void Timer_Init(); //定时器初始化函数 void display(); //数码管显示函数 void keyscan(); //矩阵按键扫描函数 //==========================主函数========================= void main(void) { LSA=LSB=LSC=0; Timer_Init(); //定时器初始化 while(1) //主循环 { keyscan(); //矩阵按键扫描 } } //=======================延时函数=========================== void delayms(uint t) { uchar i; while(t--)for(i=0;i<120;i++); } //===================定时器初始化函数====================== void Timer_Init() { TMOD=0x11; //定时器T0和T1都是工作方式1 TH0=0xf8; //定时器T0初值 TL0=0xcd; //11.0592MHz，2ms定时 EA=1; //允许总中断 ET0=1; //允许定时器T0中断 TR0=1; //启动定时器T0 TH1=TL1=0; //定时器T1初值 ET1=1; //允许定时器T1中断 TR1=0; //暂不启动定时器T1 } //===================定时器T0中断函数===================== void T0_ISR() interrupt 1 { TH0=0xf8; //重装初值 TL0=0xcd; //2ms定时 display(); //数码管扫描 } //===================定时器T1中断函数===================== void T1_ISR() interrupt 3 { TH1=table[index]>>8; //按当前音符装载定时器数据，高8位 TL1=table[index]; //低8位 buzz=~buzz; //蜂鸣器取反以驱动无源蜂鸣器发声 } //======================数码管显示函数===================== void display() { static uchar t=0; P0=0; LSC=t; if(t==0)P0=tab[tone]; //显示音符 else P0=tab[scale]; //显示音阶 t=(t+1)%2; //切换下一位 } //====================矩阵按键扫描函数==================== void keyscan() { uchar key=0; KEY_PORT=0x0f; if(KEY_PORT!=0x0f) { delayms(10); //延时消抖 if(KEY_PORT!=0x0f) { //列扫描 KEY_PORT=0x0f; switch(KEY_PORT) { case(0x07): key=1;break; case(0x0b): key=2;break; case(0x0d): key=3;break; case(0x0e): key=4;break; } //行扫描 KEY_PORT=0xf0; switch(KEY_PORT) { case(0x70): key=key;break; case(0xb0): key=key+4;break; case(0xd0): key=key+8;break; case(0xe0): key=key+12;break; } if(key>=1 && key<=7) { tone=key; //记录音符 index=(scale-1)*7+key-1; //按当前音阶和音符取频率值的序号 TH1=table[index]>>8; //定时器赋初值取音符对应的数据高字节 TL1=table[index]; //取低字节 TR1=1; //启动定时器T1发音 } else if(key==13) //降调 { if(scale>1)scale--; } else if(key==14) //升调 { if(scale<3)scale++; } while(KEY_PORT!=0xf0); //等待按键松开 TR1=0; //停止定时器T1 buzz=1; //关闭蜂鸣器 } } }

资源文件列表:

电子琴.zip 大约有8个文件

电子琴/
电子琴/Listings/
电子琴/main.c 5.62KB
电子琴/main.uvgui.lenovo 88.08KB
电子琴/main.uvopt 4.92KB
电子琴/main.uvproj 13.93KB
电子琴/Objects/
电子琴/Objects/main.hex 1.88KB