CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support
help with keypad change

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
Guest
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
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group