keyboard.c

ucos-II2.51在S3C44B0X上的移植 开发环境：SDT2.50 实验板：ES44BO

/*
 *************************************************************************
 * Copyright (c) 2003, The Lab of Embedded System and Net Security,WHUT..
 * All rights reserved. 
 *
 * Filename:    keyboard.c
 * Discription: This file deals with keyboard input and output.
 * 
 * version:            1.0
 * Author:             Qiu Yanfei <[e-mail]>
 * Accomplished Date:  2004/5/8 18:26:00
 *************************************************************************
*/
#include "..\cpu\def.h"
#include "..\cpu\44breg.h"
#include "..\cpu\44blib.h"
#include "..\uart\uart.h"
#include "..\interrupt\interrupt.h"
#include "keyboard.h"

static U8 ScanKey(void);
U8 get_key(void);
extern S8 *KeyMap[MAX_KEY_NUM] = {"S46", "S47", "S48", "S49", "S50", "S51", "S52", "S53",
            "S54", "S55", "S56", "S57", "S58", "S59", "S60", "S61"};


void key_init(void)
{    
  rPCONC &= (~0xff);		//configure GPC0-3 as Input port.	
 	rPCONC |= 0x00;	   
 	rPUPC |= 0x0f; 	
 	rPDATC &= (~0xff); 
 	
 	rPCONE=0x15569;         //configure GPE4-7 as Output port,
 	rPDATE=0x10f;
 	rPUPE=0x6;
}

static U8 ScanKey(void)
{
	U8 row;
	
	rPDATE |= 0x1ff;
	
	for(row=0; row<MAX_LINE_NUM; row++)
	{	    
	    rPDATE &= (~(1<<(row+4)));	    
	    if((~rPDATC)&0xf)
	        break;  
	}
	
	return row;
} 

U8 get_key(void)
{
  U8 row,rank,key,temp;
  temp=(~rPDATC)&0x0f;
  if(temp)
  {
      rank=temp;
      rank=rank/2;
      if(rank==4)
	   rank=3;
      row=ScanKey();	  
      if(row<MAX_LINE_NUM)
	{        
	  key=rank*MAX_LINE_NUM+row;
           return key;  
          }
  }
	
}