4x4

4x4矩阵按键控制

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar  code  key_scan[4] = {0xfe,0xfd,0xfb,0xf7};
uchar  code  key_value[16] = {0xee,0xde,0xbe,0x7e,
							  0xed,0xdd,0xbd,0x7d,
						      0xeb,0xdb,0xbb,0x7b,
						      0xe7,0xd7,0xb7,0x77,};
							  
uchar code seven_seg[] = {0xc0,0xf9,0xa4,0xb0,0x99,
                          0x92,0x82,0xf8,0x80,0x90};
sbit beep=P1^7; 
sbit k1=P2^5;
sbit k2=P2^6;
//sbit k3=P2^7;

uchar k =88;

//毫秒延时函数 
void delay(uint x)
{
	while(x--);
}
void display1(uchar x)
{
	P0 = 0xff;                 //仿真时消隐
	P0 = seven_seg[x % 10];
	P2 = 0xfe;delay(1000);
	P0 = 0xff; 	               //仿真时消隐
	P0 = seven_seg[x / 10];
	P2 = 0xfd;delay(1000);
}
//按键控制
void main(void)
{
	   	uchar i = 0,j;
	while(1)
	{
	   
  	    beep=1;
		P3 = key_scan[i];
		if(P3 != key_scan[i])
		{
			delay(200);
			
			for(j = 0;j <= 16;j++)
			{			   
				if(P3 == key_value[j])
				k =j ; 
			}  
		   beep=0;
		}
		
		display1(k);
		i++;
		if(i >= 4)
		i = 0;
  
	}
}