按键调试.c

对按键的程序实例

#include <reg51.h>
#define uchar unsigned char;
#define uint unsigned int;
sbit LED1 = P1^0;
sbit LED2 = P1^1;
sbit LED3 = P1^2;
sbit LED4 = P1^3;
sbit LED5 = P1^4;
sbit LED6 = P1^5;
sbit LED7 = P1^6;
sbit LED8 = P1^7;
sbit KEY1 = P2^0;
sbit KEY2 = P2^1;
sbit KEY3 = P2^2;
sbit KEY4 = P2^3;
sbit KEY5 = P2^4;
sbit KEY6 = P2^5;
sbit KEY7 = P2^6;
sbit KEY8 = P2^7;
uchar keynumber = 0;
void delay();

main()
{
	LED1 = 0;
	LED2 = 0;
	LED3 = 0;
	LED4 = 0;
	LED5 = 0;
	LED6 = 0;
	LED7 = 0;
	LED8 = 0;
	while(1)
	{
		if(KEY1 == 0)
		{
			delay();
			if(KEY1 == 0)
			{
				while(KEY1==0) ;
				keynumber ++;
				if(keynumber==0x10)
				{
					keynumber = 0x00;
				}	
			}
	    }
		P1 = keynumber;
		
    }
}
void delay()
{
	char i,j;
	for(i = 0;i < 50; i ++)
	{
		for(j = 0;j< 80;j ++) ;
	}
}