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Keypad And LCD So Far........

 
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zogbog



Joined: 02 Jun 2004
Posts: 16

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Keypad And LCD So Far........
PostPosted: Fri Jul 09, 2004 3:12 pm     Reply with quote
First of all thanks to everyone who has helped me over the past few weeks.

I am using a 16F877 to drive a keypad and an LCD. the drivers that i am using are lcd.c and kbd.c I have had great success in driving both the LCD and the keypad on port b. However i really need to drive them off port d freeing up port b for other things.

Code:


lcd.c

// As defined in the following structure the pin connection is as follows:
//     D0  enable
//     D1  rs
//     D2  rw
//     D4  D4
//     D5  D5
//     D6  D6
//     D7  D7
//
//   LCD pins D0-D3 are not used and PIC D3 is not used.

// Un-comment the following define to use port B
// #define use_portb_lcd TRUE //THIS COMENTED OUT


struct lcd_pin_map {                 // This structure is overlayed
           boolean enable;           // on to an I/O port to gain
           boolean rs;               // access to the LCD pins.
           boolean rw;               // The bits are allocated from
           boolean unused;           // low order up.  ENABLE will
           int     data : 4;         // be pin B0.
        } lcd;



#if defined(__PCH__)
#if defined use_portb_lcd
   #byte lcd = 0xF81                   // This puts the entire structure
#else
   #byte lcd = 0xF83                   // This puts the entire structure
#endif
#else
#if defined use_portb_lcd
   #byte lcd = 6                  // on to port B (at address 6)
#else
   #byte lcd = 8                 // on to port D (at address 8)
#endif
#endif

#if defined use_portb_lcd
   #define set_tris_lcd(x) set_tris_b(x)
#else
   #define set_tris_lcd(x) set_tris_d(x)
#endif



#define lcd_type 2           // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40    // LCD RAM address for the second line


byte CONST LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
                             // These bytes need to be sent to the LCD
                             // to start it up.


                             // The following are used for setting
                             // the I/O port direction register.

STRUCT lcd_pin_map const LCD_WRITE = {0,0,0,0,0}; // For write mode all pins are out
STRUCT lcd_pin_map const LCD_READ = {0,0,0,0,15}; // For read mode data pins are in




byte lcd_read_byte() {
      byte low,high;
      set_tris_lcd(LCD_READ);
      lcd.rw = 1;
      delay_cycles(1);
      lcd.enable = 1;
      delay_cycles(1);
      high = lcd.data;
      lcd.enable = 0;
      delay_cycles(1);
      lcd.enable = 1;
      delay_us(1);
      low = lcd.data;
      lcd.enable = 0;
      set_tris_lcd(LCD_WRITE);
      return( (high<<4) | low);
}


void lcd_send_nibble( byte n ) {
      lcd.data = n;
      delay_cycles(1);
      lcd.enable = 1;
      delay_us(2);
      lcd.enable = 0;
}


void lcd_send_byte( byte address, byte n ) {

      lcd.rs = 0;
      while ( bit_test(lcd_read_byte(),7) ) ;
      lcd.rs = address;
      delay_cycles(1);
      lcd.rw = 0;
      delay_cycles(1);
      lcd.enable = 0;
      lcd_send_nibble(n >> 4);
      lcd_send_nibble(n & 0xf);
}


void lcd_init() {
    byte i;
    set_tris_lcd(LCD_WRITE);
    lcd.rs = 0;
    lcd.rw = 0;
    lcd.enable = 0;
    delay_ms(15);
    for(i=1;i<=3;++i) {
       lcd_send_nibble(3);
       delay_ms(5);
    }
    lcd_send_nibble(2);
    for(i=0;i<=3;++i)
       lcd_send_byte(0,LCD_INIT_STRING[i]);
}


void lcd_gotoxy( byte x, byte y) {
   byte address;

   if(y!=1)
     address=lcd_line_two;
   else
     address=0;
   address+=x-1;
   lcd_send_byte(0,0x80|address);
}

void lcd_putc( char c) {
   switch (c) {
     case '\f'   : lcd_send_byte(0,1);
                   delay_ms(2);
                                           break;
     case '\n'   : lcd_gotoxy(1,2);        break;
     case '\b'   : lcd_send_byte(0,0x10);  break;
     default     : lcd_send_byte(1,c);     break;
   }
}

char lcd_getc( byte x, byte y) {
   char value;

    lcd_gotoxy(x,y);
    lcd.rs=1;
    value = lcd_read_byte();
    lcd.rs=0;
    return(value);
}

//***end of lcd.c**//

kbd.c

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

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

#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



//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() {
}

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);
}

//**end of kbd.c**//

MAIN PROGRAM

#if defined(__PCB__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=4000000)

#elif defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=4000000)

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOPROTECT
#use delay(clock=4000000)
#endif
//#define use_portb_kbd True //THIS COMENTED OUT
#include <lcd.c>
#include <kbd.c>


main()
{


   char k;
   //port_b_pullups(TRUE);
   lcd_init();
   kbd_init();

   lcd_putc("\fReady...\n");

   while (TRUE) {
      k=kbd_getc();
      if(k!=0)
        if(k=='*')
          lcd_putc('\f');
        else
          lcd_putc(k);
   }
}



these are the CCS drivers/examples and as far as i can tell i have commented out in all the right places??? Ihave also tried 10K pull ups on the colomn lines but no joy. The lcd driver works fine on port d and b but the keypad will only work on port b and not on port d (with or without the lcd in parallel.). As i am new to the programming side of things am i missing something in the cinfig of port d???

Any help is as always much appreciated
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jul 09, 2004 10:31 pm     Reply with quote
Quote:
I have also tried 10K pull ups on the column lines but no joy.


Add pullups to the Row pins on Port D.
zogbog



Joined: 02 Jun 2004
Posts: 16

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Keypad And LCD So Far........
PostPosted: Mon Jul 12, 2004 2:18 pm     Reply with quote
great stuff it works! i now have the keypad and the lcd working on port d on a pic dem 2+ board. i will tidy up my code and post it for anyone else who may be in the same position as me. Once again thanks for all the help

Laughing
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Wed Jul 14, 2004 7:43 am     Reply with quote
Yes, I'd like to read that code

put it in the code library
[url]
http://www.ccsinfo.com/forum/viewforum.php?f=2
[/url]
cxiong



Joined: 09 Sep 2003
Posts: 52

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PostPosted: Wed Aug 25, 2004 12:26 pm     Reply with quote
I use the exact code you post in here on my PIC DEMO 2 Plus and I always have the " Ready...! " message display on the LCD and when I press any key on the key pad, it does nothing more.

I have the black 4X3 keypad.

Here is my connection
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 25, 2004 12:48 pm     Reply with quote
Get rid of those pull-down resistors and enable the Port B pull-ups.
Use this CCS function to do that:

port_b_pullups(TRUE);
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