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Keypad Problem in 18F8720

 
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cfernandez



Joined: 18 Oct 2003
Posts: 145

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Keypad Problem in 18F8720
PostPosted: Tue Mar 23, 2004 2:41 pm     Reply with quote
In my circuit I connect a keypad (4x3) on PORT E and not is possible to work.

The pinout is:

E0 NC
E1 COL0
E2 COL1
E3 COL2
E4 ROW0
E5 ROW1
E6 ROW2
E7 ROW3

In the circuit i connect pull up resistor the 10 k value.

Is possible that the PORT E is not use for this job?? or which is the solution for my problem.


Thank you very much
mystery
Guest
port e
PostPosted: Tue Mar 23, 2004 3:14 pm     Reply with quote
having looked at the datasheet, port e is the data bus for external memory.

if you want to use port e as normal pins you need to:

set bit 7 of memcon register!!!!!!!!!
picker



Joined: 07 Sep 2003
Posts: 19
Location: South Africa

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Keypad and 18F8720
PostPosted: Wed Mar 24, 2004 11:20 am     Reply with quote
Did you use the CCS driver for a keypad? If you did, you have run into the same problem that I had some months ago. It has something to do with the driver. I ended up writing a much simpler driver which might use more program memory but it works!

Picker
cfernandez



Joined: 18 Oct 2003
Posts: 145

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PostPosted: Wed Mar 24, 2004 5:59 pm     Reply with quote
Hi,

I modify KBD.C from CCS drivers and put in the kbd_init() set_bit( MEMCOM, 7), previous declare #byte MEMCOM= 0xF9C and not WORK!!

This the KBD.C code

Code:

///////////////////////////////////////////////////////////////////////////
////                             KBDD.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.                        ////
////                                                                   ////
///////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,2003 Custom Computer Services           ////
//// This source code may only be used by licensed users of the CCS C  ////
//// compiler.  This source code may only be distributed to other      ////
//// licensed users of the CCS C compiler.  No other use, reproduction ////
//// or distribution is permitted without written permission.          ////
//// Derivative programs created using this software in object code    ////
//// form are not restricted in any way.                               ////
///////////////////////////////////////////////////////////////////////////

////////////////// The following defines the keypad layout on port D

// Un-comment the following define to use port B
// #define use_portb_kbd TRUE

// Make sure the port used has pull-up resistors (or the LCD) on
// the column pins


#byte kbd = 0xF84                   // This puts the entire structure
#byte MEMCOM = 0xF9C
#define set_tris_kbd(x) set_tris_e(x)



//Keypad connection:   (for example column 0 is B2)
//                Bx:

#ifdef blue_keypad  ///////////////////////////////////// For the blue keypad
#define COL0 (1 << 2)
#define COL1 (1 << 3)
#define COL2 (1 << 6)

#define ROW0 (1 << 4)
#define ROW1 (1 << 7)
#define ROW2 (1 << 1)
#define ROW3 (1 << 5)

#else ////////////////////////////////////////////////// For the black keypad
#define COL0 (1 << 5)
#define COL1 (1 << 6)
#define COL2 (1 << 7)

#define ROW0 (1 << 1)
#define ROW1 (1 << 2)
#define ROW2 (1 << 3)
#define ROW3 (1 << 4)

#endif

#define ALL_ROWS (ROW0|ROW1|ROW2|ROW3)
#define ALL_PINS (ALL_ROWS|COL0|COL1|COL2)

// 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() {

   bit_set( MEMCOM, 7)
}

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   : set_tris_kbd(ALL_PINS&~COL0);
                    kbd=~COL0&ALL_PINS;
                    break;
         case 1   : set_tris_kbd(ALL_PINS&~COL1);
                    kbd=~COL1&ALL_PINS;
                    break;
         case 2   : set_tris_kbd(ALL_PINS&~COL2);
                    kbd=~COL2&ALL_PINS;
                    break;
       }

       if(kbd_down) {
         if((kbd & (ALL_ROWS))==(ALL_ROWS)) {
           kbd_down=FALSE;
           kchar=last_key;
           last_key='\0';
         }
       } else {
          if((kbd & (ALL_ROWS))!=(ALL_ROWS)) {
             if((kbd & ROW0)==0)
               row=0;
             else if((kbd & ROW1)==0)
               row=1;
             else if((kbd & ROW2)==0)
               row=2;
             else if((kbd & ROW3)==0)
               row=3;
             last_key =KEYS[row][col];
             kbd_down = TRUE;
          } else {
             ++col;
             if(col==3)
               col=0;
          }
       }
      kbd_call_count=0;
   }
  set_tris_kbd(ALL_PINS);
  return(kchar);
}


ANY SOLUTION????????? Smile

Thanks,
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