//-----------------------------------------------------------------------------
//實(shí)驗(yàn)?zāi)康?熟悉2*2鍵盤(pán)操作.按鍵后會(huì)在液晶屏上
//顯示所按下的鍵號(hào),如按S1鍵,在液晶上顯示S1.
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f350.h>                
#include <INTRINS.H>
#include <stdio.h>
sbit	key1=P1^1;        
sbit	key2=P1^3;
sbit	key3=P1^4;
sbit	key4=P1^5;
unsigned long q;

//--------------------------------
void YJ_Init(void);
void Write_CHAR(unsigned char yjchar);
unsigned char key_in(void);
//-----------------------------------------------------
void delay(void)
{
	int a=1000;
	while(a!=0)
	{
		a--;
	}
}

/*----------------------------------------------------*/
//按鍵連接到p1.1、p1.3、p1.4、P1.5,均為開(kāi)漏輸出
unsigned char key_in(void)
{ XBR0 = 0x00;	
  P1=0xff;
   
//	P1=0x72;
	if(key1==0)
	{
		key1=1;
		delay();//延時(shí)
		if(key1==0)
		{

			while(key1==0);
            XBR0 = 0x02;
			return(0x31);//返回字符"1"表示按鍵S1按下
		}
	}

	if(key2==0)
	{
		key2=1;
		delay();//延時(shí)
		if(key2==0)
		{
			while(key2==0);
            XBR0 = 0x02;
			return(0x32);//返回字符"2"表示按鍵S2按下
		}
	}

	if(key3==0)
	{
		key3=1;
		delay();//延時(shí)
		if(key3==0)
		{
			while(key3==0);
            XBR0 = 0x02;
			return(0x33);//返回字符"3"表示按鍵S3按下
		}
	}

	if(key4==0)
	{
		key4=1;
		delay();//延時(shí)
		if(key4==0)
		{
			while(key4==0);
            XBR0 = 0x02;
			return(0x34);//返回字符"4"表示按鍵S4按下
		}
	}
    XBR0 = 0x02;
	return(0);//返回0,表示沒(méi)有按鍵按下
}

//---------------------------------------------
void main(void) 
{	
	unsigned char data1;

   PCA0MD &= ~0x40; // WDTE = 0 (watchdog timer enable bit)
   OSCICN |= 0x03; // Set internal oscillator to highest
                   // setting (24500000)
	P0SKIP    = 0x7E;
                 

    XBR0 = 0x00; // XBAR0: Initial Reset value
    XBR1 = 0x40; // XBAR1: Initial Reset value

   
   
	while(1)
	{
		data1=key_in();						//讀按鍵
		if(data1!=0)						//有按鍵按下,顯示對(duì)應(yīng)的按鍵
		{
			YJ_Init();                     //LCD初始化
                                           //準(zhǔn)備送數(shù)據(jù)
			for(q=0;q<1000;q++);
			Write_CHAR(0x53);	
			Write_CHAR(data1);		                 	//控制LCD	
			for(q=0;q<1000;q++);

		}
	}

}