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Working LCD.c driver for Samsung based chip

 
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sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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Working LCD.c driver for Samsung based chip
PostPosted: Thu Feb 09, 2006 11:13 am     Reply with quote

I am using PIC18F2525 with a 2x16 matric LCD based on S6A0069 and works well so far...(thx to PCM programmer for his helps)



This is my lcdmod.c
Code:

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);
}


//Modified code to fit S6A0069 chip based LCD
void lcd_send_nibble( BYTE n ) {
      lcd.data = n;
      delay_cycles(1);
      lcd.enable = 1;
      delay_us(2);
      lcd.enable = 0;
}


//Orignal LCD format
/*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);
}

//Modified code to fit S6A0069 chip based LCD
void lcd_init() {
    set_tris_lcd(LCD_WRITE);
    lcd.rs = 0;
    lcd.rw = 0;
    lcd.enable = 0;
    delay_ms(30);
   lcd_send_nibble(0x02);
   delay_us(1);
    lcd_send_nibble(0x02);
    delay_us(1);
    lcd_send_nibble(0x0C);
    delay_us(45);
    lcd_send_nibble(0x00);
    delay_us(1);
    lcd_send_nibble(0x0F);
    delay_us(45);
    lcd_send_nibble(0x00);
    delay_us(1);
    lcd_send_nibble(0x01);
    delay_ms(2);
    lcd_send_nibble(0x00);
    delay_us(1);
    lcd_send_nibble(0x06);
    delay_ms(2);

}

//Orignal LCD format
/*
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;
   }
}


Last edited by sonicdeejay on Fri Feb 24, 2006 5:21 pm; edited 1 time in total
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Mon Feb 20, 2006 7:19 pm     Reply with quote

In my main program..



Code:
#include <18F2525.h> // Call for PIC18F2525 Driver
#device ICD=TRUE
#device ADC=10 // Use 10bits ADC
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=16000000) // 16Mhz Crystal is Used
#use rs232(baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8)  // RS232 Configuration for COM Port Communication



#define use_portb_lcd TRUE // Using Port B for LCD Display
#include <lcdmod.c>  // This is Where I call for lcdmod.c



#byte PORTB = 0xf81
#byte PORTC = 0xf82

#include <stdlib.h>
#include <math.h>
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Sun Feb 26, 2006 6:29 am     Reply with quote

My physical connection is ...

Code:
  LCD  -   PIC18F2525

 VSS   -   GND
 VDD   -   5V
 V0    -    O/P from variable ressitor (20KOhm)

 R/S   -  PORT_B1
 R/W   -  PORT_B2
 E     -  PORT_B0

 DB0   -   NC (not connected)
 DB1   -   NC (not connected)
 DB2   -   NC (not connected)
 DB3   -   NC (not connected)
 DB4   -  PORT_B4
 DB5   -  PORT_B5
 DB6   -  PORT_B6
 DB7   -  PORT_B7



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