51单片机 C语言电子琴

左手的ㄟ右手 2022-08-20 01:24 267阅读 0赞

题目链接：[http://zhidao.baidu.com/question/1573774496307517420.html][http_zhidao.baidu.com_question_1573774496307517420.html]

\#include<reg52.h>

sbit spk = P3^7;        //扬声器接口

unsigned int tab\[\] = \{

64580,64684,64777,64820,64898,64968,65030,65058\};

unsigned char  k, k1, k2;

//-------------------------------------

void keyscan()

if(P1 != 0xff)  \{   //P1 外接 8 个按键

k = 8;

if(P1 == 0xfe)  k = 0;

if(P1 == 0xfd)  k = 1;

if(P1 == 0xfb)  k = 2;

if(P1 == 0xf7)  k = 3;

if(P1 == 0xef)  k = 4;

if(P1 == 0xdf)  k = 5;

if(P1 == 0xbf)  k = 6;

if(P1 == 0x7f)  k = 7;

if (k < 8) \{

k1 = tab\[k\] / 256;

k2 = tab\[k\] % 256;

TR0 = 1;

else  TR0 = 0;

//-------------------------------------

void main()

TMOD = 0x01;

ET0 = 1;

EA = 1;

while(1)  keyscan();

//-------------------------------------

void time() interrupt 1

TH0 = k1;

TL0 = k2;

spk = ~spk;

//-------------------------------------

追问：2014-05-07 17:13

顺带问下，题目里要和求不同频率的声音，请问给出的代码中如何修改？

回答：2014-05-07 19:09

参考：

[http://hi.baidu.com/do\_sermon/item/8cff22baf5142245bb0e1247][http_hi.baidu.com_do_sermon_item_8cff22baf5142245bb0e1247]

[http://hi.baidu.com/do\_sermon/item/d6f155da37a70fe93dc2cbc1][http_hi.baidu.com_do_sermon_item_d6f155da37a70fe93dc2cbc1]

提问者评价：谢谢!

[http_zhidao.baidu.com_question_1573774496307517420.html]: http://zhidao.baidu.com/question/1573774496307517420.html
[http_hi.baidu.com_do_sermon_item_8cff22baf5142245bb0e1247]: http://hi.baidu.com/do_sermon/item/8cff22baf5142245bb0e1247
[http_hi.baidu.com_do_sermon_item_d6f155da37a70fe93dc2cbc1]: http://hi.baidu.com/do_sermon/item/d6f155da37a70fe93dc2cbc1