单片机电子琴编程中各个音的频率的确定

Question

要求用单片机控制喇叭的频率设计电子琴，但是不知道对应的频率，能不能给个数，要三个音阶。

Answer 1

//此程序在硬件上调试通过
//本程序的单片机晶振采用11.0592M
#include
<reg51.h>
sbit
speaker=P1^2;
unsigned
char
timer0h,timer0l,time;
//世上只有妈妈好数据表
code
unsigned
char
sszymmh[]={
6,2,3,
5,2,1,
3,2,2,
5,2,2,
1,3,2,
6,2,1,
5,2,1,
6,2,4,
3,2,2,
5,2,1,
6,2,1,
5,2,2,
3,2,2,
1,2,1,
6,1,1,
5,2,1,
3,2,1,
2,2,4,
2,2,3,
3,2,1,
5,2,2,
5,2,1,
6,2,1,
3,2,2,
2,2,2,
1,2,4,
5,2,3,
3,2,1,
2,2,1,
1,2,1,
6,1,1,
1,2,1,
5,1,6,
0,0,0
};
//
音阶频率表
高八位
code
unsigned
char
FREQH[]={
0xF2,0xF3,0xF5,0xF5,0xF6,0xF7,0xF8,
0xF9,0xF9,0xFA,0xFA,0xFB,0xFB,0xFC,0xFC,
//1,2,3,4,5,6,7,8,i
0xFC,0xFD,0xFD,0xFD,0xFD,0xFE,
0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFF,
}
;
//
音阶频率表
低八位
code
unsigned
char
FREQL[]={
0x42,0xC1,0x17,0xB6,0xD0,0xD1,0xB6,
0x21,0xE1,0x8C,0xD8,0x68,0xE9,0x5B,0x8F,
//1,2,3,4,5,6,7,8,i
0xEE,0x44,
0x6B,0xB4,0xF4,0x2D,
0x47,0x77,0xA2,0xB6,0xDA,0xFA,0x16,
};
void
delay(unsigned
char
t)
{
unsigned
char
t1;
unsigned
long
t2;
for(t1=0;t1<t;t1++)
{
for(t2=0;t2<8000;t2++)
{
;
}
}
TR0=0;
}
void
t0int()
interrupt
1
{
TR0=0;
speaker=!speaker;
TH0=timer0h;
TL0=timer0l;
TR0=1;
}
void
song()
{
TH0=timer0h;
TL0=timer0l;
TR0=1;
delay(time);
}
void
main(void)
{
unsigned
char
k,i;
TMOD=1;
//置CT0定时工作方式1
EA=1;
ET0=1;//IE=0x82
//CPU开中断,CT0开中断
while(1)
{
i=0;
while(i<100){
//音乐数组长度
，唱完从头再来
k=sszymmh[i]+7*sszymmh[i+1]-1;
timer0h=FREQH[k];
timer0l=FREQL[k];
time=sszymmh[i+2];
i=i+3;
song();
}
}
《世上只有妈妈好》乐谱