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More flexible LCD driver file can be used for PICDEM2

 
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Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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More flexible LCD driver file can be used for PICDEM2
PostPosted: Tue Aug 10, 2004 8:01 am     Reply with quote

Here is a driver file that will allow you to move the control and data lines around a bit. I modified the CCS for someone a while back and here it is.

Code:

////////////////////////////////////////////////////////////////////////////
////                             LCDD.C                                 ////
////                 Driver for common LCD modules                      ////
////                                                                    ////
////  lcd_init()   Must be called before any other function.            ////
////                                                                    ////
////  lcd_putc(c)  Will display c on the next position of the LCD.      ////
////                     The following have special meaning:            ////
////                      \f  Clear display                             ////
////                      \n  Go to start of second line                ////
////                      \b  Move back one position                    ////
////                                                                    ////
////  lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1)     ////
////                                                                    ////
////  lcd_getc(x,y)   Returns character at position x,y on LCD          ////
////                                                                    ////
////////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,1997 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.                                ////
////////////////////////////////////////////////////////////////////////////

// This structure is overlayed onto the data ports so that you may use
// whatever ports you desire
struct lcd_pin_map

  BOOLEAN dummy;      // PinA0 is not used
  BOOLEAN enable;     // PinA1
  BOOLEAN rw;         // PinA2
  BOOLEAN rs;         // PinA3
  int unusedA  : 4;   // The rest of portA
  int unusedB;        // portB is not used
  int unusedC;        // portC is not used
  int     data : 4;   // lower nibble of portD is used for data lines
  int unusedD  : 4;   // The rest of portD
} lcd;
#if defined(__PCH__)
  #locate lcd = 0xF80
#else
  #locate lcd = 5
#endif

struct lcd_tris_map
{
  BOOLEAN dummy;      // PinA0 is not used
  int control  : 3;
  int unusedA  : 4;   // The rest of portA
  int unusedB;        // portB is not used
  int unusedC;        // portC is not used
  int data     : 4;   // lower nibble of portD is used for data lines
  int unusedD  : 4;   // The rest of portD
} lcdtris;

#if defined(__PCH__)
  #locate lcdtris = 0xF92
#else
  #locate lcdtris = 0x85
#endif

#define set_tris_lcd(x) lcdtris.data = (x); lcdtris.control = 0;



#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.

#define LCD_WRITE    0       // For write mode all pins are out
#define LCD_READ     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);
}

sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Fri Feb 03, 2006 4:25 am     Reply with quote

may I know the serial number of LCD i can use this code with???
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Fri Feb 03, 2006 7:29 am     Reply with quote

HD44780 compatiable
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Fri Feb 03, 2006 9:03 am     Reply with quote

Mark any example code to write in main program?? thx Smile


and what is t pin out connection between PIC and LCD???
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Fri Feb 03, 2006 9:28 am     Reply with quote

Quote:
Mark any example code to write in main program?? thx

No, but CCS provides some.

This is actually CCS's LCD driver where I just changed the declaration section to allow control and data lines to be on different ports. It is set up to work with a PICDEM 2 PLUS board. Refer to that schematic or just look at the declaration section.
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Fri Feb 03, 2006 11:23 am     Reply with quote

Mark wrote:
Quote:
Mark any example code to write in main program?? thx

No, but CCS provides some.

This is actually CCS's LCD driver where I just changed the declaration section to allow control and data lines to be on different ports. It is set up to work with a PICDEM 2 PLUS board. Refer to that schematic or just look at the declaration section.


Mark....what is the pin to pin connection between PIC and LCD,,,according to your driver???

I am using PIC 18F2525 and I have RB0 to RB5 free....and would like to connect to the LCD using those pins...

so how can I make your driver works for the connection I suggested??/





thx
sonic
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