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标题: 实验22-按键发音 [打印本页]

作者: 张衍波 时间: 2015-5-5 16:23
标题: 实验22-按键发音
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int

sbit BEEP = P1^4;
sbit K1 = P1^0;
sbit K2 = P1^1;
sbit K3 = P1^2;
sbit K4 = P1^3;

void DelayMS(uint x)
{
uchar t;
while(x--)
{
     for(t=0;t<120;t++);
}
}

void Play(uchar t)
{
uchar i;
for(i=0;i<100;i++)
{
     BEEP = ~BEEP;
DelayMS(t);
}
BEEP = 0;
}

void main()
{
P1 = 0xff;
while(1)
{
     if(K1==0) Play(1);
if(K2==0) Play(2);
if(K3==0) Play(3);
if(K4==0) Play(4);
}
}
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