LCD initialization problem with PIC

[jab99407]

Hi all,
I’ve connected a LCD display 16x2 with PIC16F877A . I 've written code for 8 bit mode When i run the code, the LCD powers up, I see the top row of the LCD with all black square. I did continuity test with multimeter all connection looks okay. It proves there is problem with LCD initialization

// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = ON        // Watchdog Timer Enable bit (WDT enabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF        // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#define _XTAL_FREQ 20000000 //Specify the XTAL crystal FREQ

#include <xc.h>

//LCD GND - to PIC GND
//LCD VCC - to PIC 5V
//LCD  CONT - to  POT

#define RS           RB1
#define RW           RB2
#define EN           RB3

#define LCD_Port     PORTD

/* Make all PORTD pins low and Configured PORT pins as Output*/
void  Port_Initialize (void)
{
   PORTA = 0;
   PORTB = 0;
   PORTC = 0;
   PORTD = 0;
   PORTE = 0;

   TRISA = 0b00000000;
   TRISB = 0b00000000;
   TRISC = 0b00000000;
   TRISD = 0b00000000;
   TRISE = 0b00000000;
}

/* Function to send command instruction to LCD */
void LCD_Command(unsigned char Command)
{
    LCD_Port = Command;
    RS=0;
    RW=0;
    EN=1;
    __delay_ms(2);
    EN=0;
}

/*LCD Initialize*/
void LCD_Initialize (void)
{
    __delay_ms(40); // wait 40 milliseconds
    LCD_Command(0x30);  // 8-bit interface data, 1-line display, 5 × 8 dot character font
    __delay_ms(5);
    LCD_Command(0x30);
    __delay_us(100);
    LCD_Command(0x30);
    __delay_us(40);
    LCD_Command(0x01); //Clears display
    __delay_us(40);
    LCD_Command(0x0F);  //display on, cursor on, cursor blink on
    __delay_us(40);
}


/*Function to send message to LCD */
void LCD_Data(unsigned char Message)
{
    LCD_Port = Message;
    RS=1;
    RW=0;
    EN=1;
   __delay_ms(2);
    EN=0;
}


void Messagebuffer( unsigned char *pointer)
{

    while (*pointer != '\0')
    {
      LCD_Data(*pointer);
  
        pointer++;
    }
}

void main(void)
{

  unsigned char string []= {"Project"};

  Port_Initialize ();
  LCD_Initialize ();

  Messagebuffer(string);

  while(1);

}

Display datasheet attached. Please help

 

[Ian Rogers]

You are missing a step in your LCD_Initialize ()

Function set 0x30, after three inits..

send 0x30 three times
then 0x30 ( or 0x20 for 4 bit )

Then set parmeters..

void LCD_Initialize (void)
{
    __delay_ms(40); // wait 40 milliseconds
    LCD_Command(0x30);
    __delay_ms(5);
    LCD_Command(0x30);
    __delay_us(100);
    LCD_Command(0x30);
    __delay_us(40);
   LCD_Command(0x30);  // 8-bit interface data, 1-line display, 5 × 8 dot character font
    __delay_us(40);
    LCD_Command(0x01); //Clears display
    __delay_us(40);
    LCD_Command(0x0F);  //display on, cursor on, cursor blink on
    __delay_us(40);
}

I would add cursor to increment as well... Personal requirement though..

 

[jab99407]

You are missing a step in your LCD_Initialize ()

Function set 0x30, after three inits..

send 0x30 three times
then 0x30 ( or 0x20 for 4 bit )

I would add cursor to increment as well... Personal requirement though..

I tried this way but still black square shows on display. don't see "Project" on display