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help with keypad change

 
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help with keypad change
PostPosted: Mon Dec 11, 2006 2:46 pm     Reply with quote
Hi PCM & All

I need your help to modify the Flexible Keypad Driver to work as follows
when you pressed a key for the character to be displayed instead of how it works now where when you press a key the character is only displaced when you release your finger from the switch.
I know its a stupid request its only that when i was given this task to do the user just want to press a switch then activity takes place only for me to find out that they ony want to use 3 switches SW1,SW2 & SW3 as just normally open contacts were when the contacts is closed then activity takes place .
( Note i have not got access to the hardware if not i would have just made some hardware changes like putting 3 pull-down resistors on 3 port pins
then use his contact to pull the voltage up to +5v but i can do that as
i am not allowed to make any hardware changes.


Please Help

Amina
so please i need some help from you


I AM USING THE EXAMPLE BELOW


Code:

Code:

//=============================

//Keypad connection:
#define row0 PIN_B4
#define row1 PIN_B5
#define row2 PIN_B6
#define row3 PIN_B7
#define col0 PIN_B0
#define col1 PIN_B1
#define col2 PIN_B2
#define col3 PIN_B3

// Keypad layout:
char const KEYS[4][4] =
{{'1','2','3','A'},
 {'4','5','6','B'},
 {'7','8','9','C'},
 {'*','0','#','D'}};


#define KBD_DEBOUNCE_FACTOR 33 // Set this number to apx n/333 where
// n is the number of times you expect
// to call kbd_getc each second

void kbd_init()
{
//set_tris_b(0xF0);
//output_b(0xF0);
port_b_pullups(true); 
}

short int ALL_ROWS (void)
{
if(input (row0) & input (row1) & input (row2) & input (row3))
   return (0);
else
   return (1);
}



char kbd_getc()
{
static byte kbd_call_count;
static short int kbd_down;
static char last_key;
static byte col;

byte kchar;
byte row;

kchar='\0';

if(++kbd_call_count>KBD_DEBOUNCE_FACTOR)
  {
   switch (col)
     {
      case 0:
        output_low(col0);
        output_high(col1);
        output_high(col2);
        output_high(col3);
        break;
   
      case 1:
        output_high(col0);
        output_low(col1);
        output_high(col2);
        output_high(col3);
        break;

      case 2:
        output_high(col0);
        output_high(col1);
        output_low(col2);
        output_high(col3);
        break;

      case 3:
        output_high(col0);
        output_high(col1);
        output_high(col2);
        output_low(col3);
        break;
      }

   if(kbd_down)
     {
      if(!ALL_ROWS())
        {
         kbd_down=false;
         kchar=last_key;
         last_key='\0';
        }
     }
   else
     {
      if(ALL_ROWS())
        {
         if(!input (row0))
            row=0;
         else if(!input (row1))
            row=1;
         else if(!input (row2))
            row=2;
         else if(!input (row3))
            row=3;

         last_key =KEYS[row][col];
         kbd_down = true;
        }
      else
        {
         ++col;
         if(col==4)
            col=0;
        }
     }
   kbd_call_count=0;
  }
return(kchar);
}

//===========================
void main()
{
char k;

kbd_init();

printf("\r\Starting ...");

while(TRUE)
  {
   k=kbd_getc();
   if(k!=0)
     {
      if(k=='*')
         printf("%c", '*');
      else
         printf("%c", k);
         if (k=='1')
           {
             Do sw1;
           }
          if (k=='2')
             {
              Do sw2;
             }
          if (k=='3')
           {
             Do sw3;
           }

           

     }
  }

}
BOB_SANTANA



Joined: 16 Oct 2006
Posts: 110
Location: HOVE, EAST SUSSEX

View user's profile Send private message

PostPosted: Tue Dec 12, 2006 4:51 pm     Reply with quote
Hi Amina

If you only want to use just SW1 -Sw3
you can do it without portb change interupt
you can something like this


1. Enable PORTB pull-ups

2. Set PORTB lines low to read buttons
3. Set TRISB to 0xf0 ' Enable all buttons

Code:

   
while (1)
{
        ' Then just Check any button pressed
        If (! input(PIN_B4)   //sw1
           {
              delay_ms(50); // debounce
              If (! input(PIN_B4)   //sw1
               {
                  DO SW1;
                }
           }

         If (! input(PIN_B5)   //sw2
           {
              delay_ms(50); // debounce
              If (! input(PIN_B5)   //sw2
               {
                  DO SW2;
                }
           }

         If (! input(PIN_B6)   //sw3
           {
              delay_ms(50); // debounce
              If (! input(PIN_B8)   //sw3
               {
                  DO SW3;
                }
           }

     
}
   
Smile
_________________
BOB_Santana Smile
Guest
PostPosted: Wed Dec 13, 2006 9:54 am     Reply with quote
Thanks Bob

I didn't think it would work but its working

Amina
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