keypad.c

OMAP1030 处理器的ARM 侧硬件测试代码 OMAP1030 是TI的双核处理器

//=====================================================================  
//       TEXAS INSTRUMENTS INCORPORATED PROPRIETARY INFORMATION             
// Property of Texas Instruments -- For Unrestricted Internal Use Only   
// Unauthorized reproduction and/or distribution is strictly prohibited  
// This product is protected under copyright law and trade secret law as 
// an unpublished work.Created 1987,(C) Copyright 1997 Texas Instruments.
// All rights reserved.                                                  
//=====================================================================  
// Description    	: keypad interface
//
// Project        	: Helen    
//
// Author         	: Laurent Delahaye (STUDIEL)
//===============================================================================

#include "global_types.h"
#include "armio32.h"

extern UWORD32  loop_wait;

#define KP_ROWS	5
#define KP_COLS	6

const char keypad[KP_ROWS][KP_COLS]=
{                          // Electrical & physical
  {'c','-',' ','^',' ',' '},    // row 0 (highest)
  {'1','2','*','3',' ',' '},    // row 1
  {'7','8','0','9',' ',' '},    // row 2
  {'4','5','#','6',' ',' '},    // row 3
  {'<','>',' ','v',' ',' '},    // row 4 (lowest)
};


char KEYP_KeypadRead(void)
{
UWORD8 row;
UWORD8 col;
UWORD8 row_number;
UWORD8 col_number;
UWORD8 save_row;
UWORD8 read_row;
UWORD8 col_value=0x01;

   save_row = (ARMIO_GET_ALL_KBROW() & 0x1F);

   // Row identification
   for (row_number=0 ; row_number<KP_ROWS ; row_number++)
   {
      if (ARMIO_GET_BIT_KBROW(row_number) == 0)
      {
         row = row_number;
      }
   }

   // Column identification
   for (col_number=0 ; col_number<KP_COLS ; col_number++)
   {
      ARMIO_SET_ALL_KBCOL(~(col_value << col_number)); // Write a 0 on the processed columns and a 1 on the others
      for(loop_wait=0; loop_wait<0x10; loop_wait++); // Wait for stable status

      read_row = (ARMIO_GET_ALL_KBROW() & 0x1F); // Read rows status  

      if (read_row == save_row) // Rows status is the same than the beginning ?
      {  
         col = col_number;
      }
   }

   // Set ouput colums to 0
   ARMIO_SET_ALL_KBCOL(0x00);

   return(keypad[row][col]);
}