单片机八键电子琴源程序

ID:169534 · 发表于 2020-7-8 04:48

#include <reg52.H>

sbit SPEAKER  = P3^7;
#define KEY  P1
unsigned char MUSIC;
unsigned char STH0;
unsigned char STL0;
unsigned int code tab[]={
64021,64103,64260,64400,//低音3开始
64524,64580,64684,64777,
64820,64898,64968,65030,
65058,65110,65157,65178
};

void main(void){
      TMOD=0x01;
      ET0=1;
      EA=1;
      KEY = 0xff;
      while(1){
            if(KEY != 0xff){
            switch (~KEY){//显示的列位置
                              case 0x01://
                                    MUSIC = 7;
                                    break;//
                              case 0x02://
                                    MUSIC = 6;
                                    break;//
                              case 0x04://
                                    MUSIC = 5;
                                    break;//
                              case 0x08://
                                    MUSIC = 4;
                                    break;//
                              case 0x10://
                                    MUSIC = 3;
                                    break;//
                              case 0x20://
                                    MUSIC = 2;
                                    break;//
                              case 0x40://
                                    MUSIC = 1;
                                    break;//
                              case 0x80://
                                    MUSIC = 0;
                                    break;//
            }

                  STH0=tab[MUSIC]/256;
                  STL0=tab[MUSIC]%256;
                  TR0=1;
            }else{
                  SPEAKER = 1;
                     TR0=0;
            }
}
}
void t0(void) interrupt 1 using 0{
  TH0=STH0;
  TL0=STL0;
  SPEAKER=~SPEAKER;
}

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