key.c

基于keil C开发环境的ARM 2119液晶显示程序开发。

/******************************************************************************/
/*  This file is part of the uVision/ARM development tools                    */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                                  */
/******************************************************************************/
/*                                                                            */
/*  																		  */
/*  KEY.C:  KEY              Example                                          */
/*                                                                            */
/*																			  */
/* 	KEY_SUB  		0x13;			  //00010011							  */
/* 	KEY_RETURN  	0x23;			  //00100011							  */
/* 	KEY_DOWN        0x43;			  //01000011							  */
/* 	KEY_LEFT        0x83;			  //10000011							  */
/* 	KEY_OK          0x15;			  //00010101							  */
/* 	KEY_PULS        0x25;			  //00100101							  */
/* 	KEY_RIGHT       0x45;			  //01000101							  */
/* 	KEY_UP          0x85;			  //10000101							  */
/* 	KEY_F4  		0x16;			  //00010110							  */
/* 	KEY_F3  		0x26;			  //00010110							  */
/* 	KEY_F2  		0x46;			  //00010110							  */
/* 	KEY_F1  		0x86;			  //00010110							  */
/*																			  */
/******************************************************************************/

#include <LPC2294.H>              /* LPC21xx definitions                      */


extern void putstr(char *p);
extern void puthex (int hex);

unsigned char bKeyDown,bKey_p,bKey_m;  
unsigned char KeyNum;
unsigned long KeyOut[4] = {0x00080000,0x00100000,0x00200000,0x00400000};

//获得按键
void Get_Key(void)    
{
unsigned char  i;	
unsigned long  InputKeyTemp;
unsigned char  KeyCodeTemp;
unsigned char  InputKey2; 

	IOCLR0 =0x00780000;      					 //P0.19:22 =0000;
	InputKeyTemp = IOPIN0;        				 //InputKey=P27:29;
	InputKey2 = (unsigned char )(InputKeyTemp >> 27) & 0x07;

    if (InputKey2 == 0x07)  					 //no key push down  
    {
    	bKey_m = 0;   	bKey_p = 0;
    	return;
    }
    else
    {
		if (bKey_m == 0)  	
		{
			bKey_m = 1;	return;
		}
    	else if (bKey_m==1 && bKey_p==0)
    	{ 
			for(i=0;i<4;i++)
			{
				IOSET0 = 0x00780000 - KeyOut[i]; //P0.19:22
				IOCLR0 = KeyOut[i] ;      		 //P0.19:22
				InputKeyTemp = IOPIN0;    		 //InputKey=P27:29;

				if (InputKey2 != 0x07) 
			    {
					KeyCodeTemp = (unsigned char)((KeyOut[i]>>15)+ InputKey2);
					bKeyDown = 1;
					KeyNum = KeyCodeTemp;
	   		 		bKey_p=1;
					break;
			    }
	   		} 	
    	}
    }
}