音乐发生器 keil代码

ID:782260 · 发表于 2021-3-26 13:20

#include <reg51.h>
#define uint  unsigned int
#define uchar unsigned char
#define output P1 //P1口做输出接口
#define input  P1    //P1口做输入接口

unsigned int code Soundtab[] = { 64580,64684,64777,64820,64898,64968,65030,65058,};  //设置T值
uint SoundTemp;       //用来存储T值
sbit Sound = P3^7;    //扬声器，接P3.7口

void delayms(uint xms) //延时x毫秒
{
uint x,y;
   for(x=xms;x>0;x--)
   for(y=110;y>0;y--);
}

void T0_INT(void) interrupt 1    //中断程序
{
   Sound = ~Sound;    //电平取反，发音
   TH0 = SoundTemp/256;    //除以256
   TL0 = SoundTemp;                //载入定时半周期的初始值

}

void main()
{
TMOD = 0X01;       //定时器T0设置为方式1
EA = 1;
ET0 = 1;       //使能 T0 中断
TR0 = 0; //关闭T0定时器
while(1) //循环
  {

   uint n;
   uchar L,H;          //临时保存读取的行或者列
   output = 0x0f;
      L = input; //读取列
   if(0x0f != L)    //如果按键按下
{
delayms(5);       //延时，用于消除抖动
L = input; //再读取列
if(0x0f != L) //说明按键按下
{
L = L & 0x0f;          //保留低4位
output = 0xf0; //准备读取行
delayms(1);          //延时
H = input;       //读取行
H = H & 0xf0;         //保留高4位
L = L | H;             //将列和行的值合并
}
}

if(L==0xee)
{ //P1=11101110  P1^0与P1^4输入低电平    说明是按键1按下
   n=0;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0xde)
{ //P1=11011110  P1^0与P1^5输入低电平    说明是按键2按下
   n=1;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0xbe)
{ //说明是按键3按下
   n=2;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0x7e)
{ //说明是按键4按下
   n=3;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0xed)
{ //说明是按键5按下
   n=4;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0xdd)
{ //说明是按键6按下
   n=5;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0xbd)
{ //说明是按键7按下
   n=6;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
if(L==0x7d)
{ //说明是按键8按下
   n=7;
   SoundTemp = Soundtab[n];      //读取音调的简谱码T值
      TR0 = 1;             //启动中断
   while(0xf0 != output);       //检测按键松开
      TR0 = 0;
   Sound = 1 ;
}
  }
}

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