key-and-led-display.c

本程序是检测矩阵键盘

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit x=P2^0;

uchar code table[]={
0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,
0xa7,0xA1,0x86,0x8e};
uchar temp,num;
delay(uchar);
display(uchar);
void main()
{
	while(1)
	{
		P0=0xfe;
		temp=P0;
		temp=temp&0xf0;
		if(temp!=0xf0)
		 {
			delay(50);
			if(temp!=0xf0)
			 {
				switch(temp)
				{
					case 0xe0: num=0;
						break;
					case 0xd0: num=1;
						break;
					case 0xb0: num=2;
						break;
					case 0x70: num=3;
						break;
				
				}
			 }
		 }

		P0=0xfd;
		temp=P0;
		temp=temp&0xf0;
		if(temp!=0xf0)
		 {
			delay(50);
			if(temp!=0xf0)
			 {
				switch(temp)
				{
					case 0xe0: num=4;
						break;
					case 0xd0: num=5;
						break;
					case 0xb0: num=6;
						break;
					case 0x70: num=7;
						break;
				
				}
			 }
		 }

		P0=0xfb;
		temp=P0;
		temp=temp&0xf0;
		if(temp!=0xf0)
		 {
			delay(50);
			if(temp!=0xf0)
			 {
				switch(temp)
				{
					case 0xe0: num=8;
						break;
					case 0xd0: num=9;
						break;
					case 0xb0: num=10;
						break;
					case 0x70: num=11;
						break;
				
				}
			 }
		 }

		P0=0xf7;
		temp=P0;
		temp=temp&0xf0;
		if(temp!=0xf0)
		 {
			delay(50);
			if(temp!=0xf0)
			 {
				switch(temp)
				{
					case 0xe0: num=12;
						break;
					case 0xd0: num=13;
						break;
					case 0xb0: num=14;
						break;
					case 0x70: num=15;
						break;
				
				}
			 }
		 }
     display(num);
	}
}

delay(uchar x)
{
	uchar a,b;
	for(a=x;a>0;a--)
	 for(b=200;b>0;b--);
}
display(uchar num1)
{
	P1=table[num1];
    x=0;

}