独立按键C语言编程

#include<reg52.h>

#define uchar unsigned char

#define uint unsigned int

uchar code table[]=

{

0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f,

}

sbit key1=P3^4

uchar num=0

void delay(uint z)

void main()

{

while(1)

{

P2=0xfe

P0=table[num]

delay(50)

if(key1==0)

{

while(!key1)

num++

}

if(num==10)

{

num=0

}

}

}

void delay(uint z)

{

while(z--)

}

sbit KEY = P0^1

sbit LED = P0^2

int keyscan(void)

{

bit keyval=0

if(KEY)

{

delay(30)//延时消抖

if(KEY)

{

keyval = ~keyval//值取反

if(keyval )

{

LED = 1//led亮

}

else

{

LED = 0//led灭

}

}

}

}

---