#include<reg51.h>
#defineuint unsigned int
#defineuchar unsigned char
sbitspeaker = P2^7;
sbit key0 =P1^0;
sbit key1 =P1^1;
sbit key2 =P1^2;
sbit key3 =P1^3;
sbit key4 =P1^4;
sbit key5 =P1^5;
sbit key6 =P1^6;
sbit key7 =P1^7;
ucharled[8]={0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80};
voiddelay_1ms(uint t)
{
uchar m,n;
for(m=t;m>0;m--)
for(n=330;n>0;n--);
}
bitiskeyinput() //判断是否有按键闭合
{
if((P1 & 0xff) ==0xff ) //屏蔽高4位(列线),只检测低4位(行线)
return 0; //没有键闭合，返回0
else
return 1; //有键闭合，返回1
}
ucharkey_identify() //识别键号
{
uchar key;
if( key0==0 )key=0;
if(key1==0 )key=1;
if( key2==0 )key=2;
if( key3==0 )key=3;
if( key4==0 )key=4;
if( key5==0 )key=5;
if( key6==0 )key=6;
if( key7==0 )key=7;
return key; //输出键号
}
voidkeyprocess(uchar keynum)
{
uint i;
P0 = led[keynum];
i=500;
while(i--)
{
speaker = 0;
delay_1ms(10);
speaker = 1;
}
}
void main()
{
uchar keynum;
P0 = 0xFF;
while(1)
{
while (!iskeyinput() ); //如果没有键，则等待
delay_1ms(10); //去除键抖动
if(iskeyinput() ) //当前有按键，需要识别按键并且等待键盘松开
{
keynum= key_identify(); //识别键号
keyprocess(keynum);
while(1); //等待复位
}
}
}
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