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Flexible Keypad Driver
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Ahmed



Joined: 07 Mar 2006
Posts: 19

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Flexible Keypad Driver
PostPosted: Mon Mar 13, 2006 3:48 pm     Reply with quote

This is a modification of CCS keypad driver (KBDD.c) with flexible pins connections.

Code:
///////////////////////////////////////////////////////////////////////////
////                             Flex_KBD.C                            ////
////                  Generic keypad scan driver                       ////
////                                                                   ////
////  kbd_init()   Must be called before any other function.           ////
////                                                                   ////
////  c = kbd_getc(c)  Will return a key value if pressed or /0 if not ////
////                   This function should be called frequently so as ////
////                   not to miss a key press.                        ////
////                                                                   ////
///////////////////////////////////////////////////////////////////////////



//Keypad connection: 

#define col0 PIN_E1
#define col1 PIN_A5
#define col2 PIN_C0
#define row0 PIN_E0
#define row1 PIN_C2
#define row2 PIN_C1
#define row3 PIN_E2

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

#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() {
}


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);
                    break;
         case 1   : output_high(col0);
               output_low(col1);
               output_high(col2);
                    break;
         case 2   : output_high(col0);
               output_high(col1);
               output_low(col2);
                    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==3)
               col=0;
          }
       }
      kbd_call_count=0;
   }
  return(kchar);
}
jruibarroso



Joined: 07 Jan 2006
Posts: 64
Location: Braga

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Anyone can modify this excellent flex code to 4x4 keyboard ?
PostPosted: Thu Oct 05, 2006 7:03 am     Reply with quote

Anyone can modify this excellent flex code to 4x4 keyboard ?

#device <All_Members>
#include <Thank_you>
PCM programmer



Joined: 06 Sep 2003
Posts: 19953

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PostPosted: Thu Oct 05, 2006 11:59 am     Reply with quote

This has already been done. It's at this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=28022&start=14
jruibarroso



Joined: 07 Jan 2006
Posts: 64
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Can you separate this code in "driver" code and &q
PostPosted: Sun Oct 08, 2006 9:02 am     Reply with quote

Can you separate this code in "driver" code and "main" code

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 19953

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PostPosted: Sun Oct 08, 2006 10:27 am     Reply with quote

In the link given above, the driver is all the code between the two
dashed lines:

Code:

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

// driver code is in here.

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


The main() code is above and below the dashed lines.
40inD



Joined: 30 Jul 2007
Posts: 104
Location: Moscow, Russia

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PostPosted: Wed Aug 01, 2007 3:07 am     Reply with quote

I suggest to output_float the "row" pins in the end of scan procedure if you use this driver in interrupt routine. In some cases interrupt works only 1 time w/out this.
ankur_rustagi12



Joined: 29 Mar 2009
Posts: 3

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PostPosted: Fri Apr 03, 2009 6:31 am     Reply with quote

I changed the pin config to B0 to B6

but when i am running the above programme it is showing the following
errors:

Warning [361] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 27.5 function declared implicit int
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 27.12 undefined identifier "PIN_C3"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 27.29 undefined identifier "PIN_C4"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 27.46 undefined identifier "PIN_C5"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 27.63 undefined identifier "PIN_C6"
Warning [361] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 47.10 function declared implicit int
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 47.21 undefined identifier "PIN_C0"
Warning [361] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 48.1 function declared implicit int
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 48.13 undefined identifier "PIN_C1"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 49.13 undefined identifier "PIN_C2"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 63.10 undefined identifier "false"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 69.12 undefined identifier "PIN_C3"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 71.17 undefined identifier "PIN_C4"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 73.17 undefined identifier "PIN_C5"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 75.17 undefined identifier "PIN_C6"
Error [192] C:\Documents and Settings\Ankur\Desktop\Ankur\pic\keypad.c; 78.12 undefined identifier "true"


help me out...
PCM programmer



Joined: 06 Sep 2003
Posts: 19953

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PostPosted: Fri Apr 03, 2009 11:44 am     Reply with quote

You're using the Hi-Tech C compiler. Code on this forum will not work
with that compiler. Please go to the Hi-Tech forum and use their sample code:
http://forum.htsoft.com/all/ubbthreads.php
ankur_rustagi12



Joined: 29 Mar 2009
Posts: 3

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PostPosted: Fri Apr 03, 2009 11:03 pm     Reply with quote

yup..that may be the reason..
So if i uninstall the hi-tech compiler and install ccs compiler and compile in mplab ide environment...then will this program work???...will it work???
Scythe



Joined: 05 Mar 2010
Posts: 5

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PostPosted: Fri May 28, 2010 11:31 am     Reply with quote

I need to ask something. I read a lot about this code but I understand if you use this library with port_b_pullups(true), you don't need additional resistors for pull up the rows. You can directly connect rows and cols to b port. Am I wrong ?
PCM programmer



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Posts: 19953

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PostPosted: Fri May 28, 2010 12:08 pm     Reply with quote

That's correct.
GabrielVinicios



Joined: 27 May 2011
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PostPosted: Fri Sep 13, 2013 5:28 pm     Reply with quote

My library for doing this follow below:

Code:

/*    gv_teclado.c
My library can be used in keypads 3x4 with those numbers:

1 2 3
4 5 6
7 8 9
* 0 #
But you can change those characters the way you want.

EXEMPLE OF USE:

char c;
do{
c=le_teclado();
}while (c=='\0');

The function returns '\0' when no key is pressed.

*/

#define COL1 PIN_B0
#define COL2 PIN_B1
#define COL3 PIN_B2
#define LIN1 PIN_B3
#define LIN2 PIN_B4
#define LIN3 PIN_B5
#define LIN4 PIN_B6

char le_teclado(){
//seleciona coluna1
output_high(COL1);
output_low(COL2);
output_low(COL3);

if (input(LIN1)==1){
   return '1';
}

if (input(LIN2)==1){
   return '4';
}


if (input(LIN3)==1){
   return '7';
}

if (input(LIN4)==1){
   return '*';
}




//seleciona coluna2
output_low(COL1);
output_high(COL2);
output_low(COL3);

if (input(LIN1)==1){
   return '2';
}

if (input(LIN2)==1){
   return '5';
}


if (input(LIN3)==1){
   return '8';
}

if (input(LIN4)==1){
   return '0';
}

//seleciona coluna3
output_low(COL1);
output_low(COL2);
output_high(COL3);

if (input(LIN1)==1){
   return '3';
}

if (input(LIN2)==1){
   return '6';
}


if (input(LIN3)==1){
   return '9';
}

if (input(LIN4)==1){
   return '#';
}

return '\0';


}
criss_m



Joined: 09 Mar 2006
Posts: 9
Location: Chile

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PostPosted: Tue May 20, 2014 3:02 am     Reply with quote

Its very strange:

i am trying to use the following pins in a SOIC 18F258:
i use flex LCD in same pins (plus PINC7)

#define COL1 PIN_A0
#define COL2 PIN_A1
#define COL3 PIN_A2

#define LIN1 PIN_C3
#define LIN2 PIN_C4
#define LIN3 PIN_C5
#define LIN4 PIN_C6

LCD seems to work fine , but keypad does not work ...
I tried putting pull up resistors in the rows ... but no luck either...

Any ideas ???
jacktaylor



Joined: 02 Sep 2017
Posts: 11

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PostPosted: Tue Sep 12, 2017 10:04 am     Reply with quote

This code helped me solve my problem.

I tried to modify the library KDB_LIB.C, but it did not work for ports_C_D, RD0 to RD3 and RE1, RE2, RE2, RC0, RC1, RC2. I believe that it is not enough just to modify from B to C and D, because in the code of this library the memory address of the PORTS_B and D is inserted plus a value of structure as copy of the library below:
Code:

#if defined (__ PCH__)
#if defined use_portb_kbd
   #byte kbd = 0xF81 // This puts the entire structure
#else
   #byte kbd = 0xF83 // This puts the entire structure
#endif
#else
#if defined use_portb_kbd
   #byte kbd = 6 // on to port B (at address 6)
#else
   #byte kbd = 8 // on to port D (at address 8)
#endif
#endif
#if defined use_portb_kbd
   #define set_tris_kbd (x) set_tris_b (x)
#else
   #define set_tris_kbd (x) set_tris_d (x)
#endif

I believe it's necessary to insert the port that I want to use by doing all the above modifications, I did not do it because I do not know what this structure command means:
Code:

   #byte kbd = 0xF81 // This puts the entire structure
   #byte kbd = 0xF83 // This puts the entire structure
PCM programmer



Joined: 06 Sep 2003
Posts: 19953

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PostPosted: Tue Sep 12, 2017 10:24 pm     Reply with quote

Jack,
Your post has nothing to do with Ahmed's flex keypad driver.
You shouldn't have posted it here.

I googled kbd_lib.c and Google says it doesn't exist:
Quote:
No results found for "KDB_LIB.C".

I think your posted code may pertain to the CCS driver file "kbd.c",
but it's totally unrelated to Ahmed's keypad driver.
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