adc_key.c

Zoran V966 DVD 解码 Soc芯片的源程序

/* **************************************************************************************
 *  Copyright (c) 2002 ZORAN Corporation, All Rights Reserved
 *  THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF ZORAN CORPORATION
 *
 *  File: $Workfile: adc_key.c $             
 *
 * Description:
 * ============
 *
 * 
 * Log:
 * ====
 * $Revision: 3 $
 * Last Modified by $Author: Dingming $ at $Modtime: 03-04-23 18:52 $
 ****************************************************************************************
 * Updates:
 ****************************************************************************************
 * $Log: /SourceCode/I64_Common/I64_Reference/FP/ADC_KeyScan/adc_key.c $
 * 
 * 3     03-04-23 19:06 Dingming
  **************************************************************************************** */

#include "Config.h"		// Global Configuration - do not remove!
#ifdef ADC_KEY_SCAN	//DM042103
#include "FP\fp_ll.h"
#include "fp\ADC_KeyScan\adc_key.h" 
#include "Playcore\PS\ps.h"

static BYTE p_keycode[1];

/****************************************************************************/
BYTE ADC_LL_ReadKeyScan( BYTE*** Key_Code )
{

    BYTE i,counter =0;
    BYTE  temp;
    UINT8 ad_value=0;
    WORD p_keycode_total =0;

    for(i=1;i<=WORD_USED_TO_GET_AVERAGE;i++)
     {
            if(!DEC_ADC_read( ADCIN7, &ad_value))
            {  
                continue;
            }
            if(counter>0)
            {
             	 temp = p_keycode_total/counter;
                if((temp>=ad_value )&&((temp-ad_value)>0x05))
                    { return 0;}
                else if((temp<=ad_value) &&((ad_value-temp)>0x05))
                    { return 0;}
                else
                    { p_keycode_total+=ad_value;
                      counter++;
                    }
            }
     	      else if (ad_value>=0x0a)//threshold for idle.
               { p_keycode_total+=ad_value;
     	           counter++;
     	         }
	         else ;


     }//for
    if (counter<2)  return  0;
   
   p_keycode_total/=counter;
   counter =0;    //initialize to 0 for invalid return key.
//   for (i=0; i<key_count; i++)
//   {
//       if(IS_KEY_VALID(p_keycode_total,i)) DM042303 Transfer to FP_LUT because of customization
//          {
          p_keycode[0] = p_keycode_total;//DM042303 AD_KEY_MAP[i][2];
          counter =1 ;
//          break;
//          }
//   }
  **Key_Code = p_keycode;
  return counter; 
}
#endif