[SOLVED] Pic lcd interface not working

[burrow]

Well, i ran into a problem which many other beginners face while interfacing pic with lcd. i googled and checked solution given in all forums and i cant still get it to work.

Iam using pic18f4520.
The lcd iam using is JHD162A.

My Mikroc program to check lcd is

sbit LCD_RS at RC2_bit;
sbit LCD_EN at RD2_bit;
sbit LCD_D4 at RD0_bit;
sbit LCD_D5 at RC5_bit;
sbit LCD_D6 at RC0_bit;
sbit LCD_D7 at RC1_bit;
sbit LCD_RS_Direction at TRISC2_bit;
sbit LCD_EN_Direction at TRISD2_bit;
sbit LCD_D4_Direction at TRISD0_bit;
sbit LCD_D5_Direction at TRISC5_bit;
sbit LCD_D6_Direction at TRISC0_bit;
sbit LCD_D7_Direction at TRISC1_bit;

void main() {

TRISB=0b00000000;

Delay_ms(100); 
Delay_ms(100);   
Delay_ms(100);
 
Delay_ms(100);
Delay_ms(100);
 Delay_ms(100);

 Lcd_Init(); // Initialize LCD

 Delay_ms(100);        
 Delay_ms(100);
Delay_ms(100);

 Lcd_Cmd(_LCD_CLEAR); // Clear display


    Delay_ms(100);
    PORTB=0b11111111;
    
    

            while(1)
            {
     Lcd_Out(1,3,"Helllooooo");

      PORTB=0b00000000;
 Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
   Delay_ms(100);
      Delay_ms(100);         Delay_ms(100);

       PORTB=0b11111111;
            Delay_ms(100);         Delay_ms(100);
      Delay_ms(100);


}
}

I tried with many combination of delays etc.
Wiring is okay, i checked the connection twice or thrice . Connection sees alright.
but i see only boxes.

iam using pic internal oscillator, and frequency iam using is 4mhz
I am using pot for contrast pin.

And yea lcd is working with other pic.

 

[milan.rajik]

For PIC18F you have to use LATx instead of PORTx.

Changes to

---

Code C - [expand]
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sbit LCD_RS at LATC2_bit;
sbit LCD_EN at LATD2_bit;
sbit LCD_D4 at LATD0_bit;
sbit LCD_D5 at LATC5_bit;
sbit LCD_D6 at LATC0_bit;
sbit LCD_D7 at LATC1_bit;

---

 

[burrow]

For PIC18F you have to use LATx instead of PORTx.

Changes to

---

Code C - [expand]
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sbit LCD_RS at LATC2_bit;
sbit LCD_EN at LATD2_bit;
sbit LCD_D4 at LATD0_bit;
sbit LCD_D5 at LATC5_bit;
sbit LCD_D6 at LATC0_bit;
sbit LCD_D7 at LATC1_bit;

---

Ok i will try that.
But u know, my code works in proteus..

 

[nagkiller]

Is works!!!

Try it:

 

[burrow]

Ok i will try that.
But u know, my code works in proteus..

Tried your suggestions too.. still not working.
tried changing ports
still no use..
what else could go wrong ?

any problem with internal oscilator ?

 

[burrow]

I just changed ports and started using port D, and it seems to work now, Not sure if port was causing the problem

 

[milan.rajik]

If the pins used for LCD also have analog (ADC) functions then disable them using ANSELx or ADCONx registers.

 

[burrow]

I had disabled all other functions on that pins, anyway i guess i should try with previous pin setup again and trouble shoot what was wrong