lesson 5_3.c

有51单片机C语言基础后在较短时间内学会51单片机C。

#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar num,temp,temp1,i,row;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delay(uint z);
void initial();
void display();
void jianche();
void jianzhi();
void main()
{
    initial();
	while(1)
	{

		P3=0xf0;
		temp=P3;
		if(temp!=0xf0)		//判断是否有键按下
		{	
			P3=0xfe; row=0xfe;	 //扫描第一行
			jianche();
		
			P3=0xfd; row=0xfd;	 //扫描第二行
			jianche();
		
			P3=0xfb; row=0xfb;	 //扫描第三行
			jianche();
		
			P3=0xf7; row=0xf7;	  //扫描第四行
			jianche();
		 }         
	   
	}
}

void initial()
{
	num=0;
	temp=0;

	temp1=0xc0;
	P1=temp1;

	wela=1;
	P0=0xfe;
	wela=0;
	
	dula=1;
	P0=0x00;
	dula=0;	
}

void display()
{
	dula=1;
	P0=table[num];
	dula=0;

	temp1=_crol_(temp1,1);
	P1=temp1;
}

void jianche()
{
			temp=P3;
			temp=temp&0xf0;
			if(temp!=0xf0)		//判断是否有键按下
			{
				delay(5);		//去抖动
				temp=P3;
			    temp=temp&0xf0;
				if(temp!=0xf0)	 //再判断是否真的键按下
				{

				    jianzhi();

					temp=P3; //必须从新读P3,否则显示乱码
				    while(P3!=row);  //判断是否松手
					delay(5);		   //松手后去抖动
					display();
				 }
			}
}

void jianzhi()
{
	switch(temp)
	{
		case 0xe0: {if(row==0xfe) num=0;
				   if(row==0xfd) num=4;
				   if(row==0xfb) num=8;
				   if(row==0xf7) num=12;} 
        	       break;
		case 0xd0: {if(row==0xfe) num=1;
				   if(row==0xfd) num=5;
				   if(row==0xfb) num=9;
				   if(row==0xf7) num=13;} 
        	       break;
		case 0xb0: {if(row==0xfe) num=2;
				   if(row==0xfd) num=6;
				   if(row==0xfb) num=10;
				   if(row==0xf7) num=14;} 
        	       break;
		case 0x70: {if(row==0xfe) num=3;
				   if(row==0xfd) num=7;
				   if(row==0xfb) num=11;
				   if(row==0xf7) num=15;} 
        	       break;
	}
}

void delay(uint z)
{
	uint x,y;
	for(x=z;x>0;x--)
		for(y=110;y>0;y--);
}