Problem using LCD on PortA and PortE with MiKroC - Electronic Circuits Projects Diagrams Free

Nizar · 5th February 2009, 04:00 AM

Every thing works OK when I'm using Proteus with but in the reality when I make my circuit nothing appears on the LCD I'm using PIC18F4550 und LMB162A LCD my Cristal is 8MHZ
I think the problem is by using PortA or PortE when I use PortB or PortD every thing is OK.
Thank You all
This is my Code:

Code:

char *text = "Hello World";

void main()
{
  CMCON |= 0x07;             // turn off comparators
  ADCON1 |= 0x0F;           // turn off analog inputs

  TRISA = 0x00;
  TRISE = 0x00;                        // PORTB is output
  TRISB = 0x00;
  
  Lcd_Custom_Config(&PORTA,3,2,1,0,&PORTE,2,1,0);  // Initialize LCD on PORTB
  Lcd_Custom_Cmd(Lcd_CURSOR_OFF);           // Turn off cursor
  Lcd_Custom_Cmd(LCD_CLEAR);
  Lcd_Custom_Out(1, 1, text);
  
  PORTB.F2 = 1;
  
  while(1)
  {
    Delay_ms(250);  // One second pause
    Lcd_Custom_Cmd(LCD_SHIFT_RIGHT);
    PORTB.F2 = ~PORTB.F2;
  }

}

This is my circuit:

yatoof · 5th February 2009, 10:28 AM

pull up all data lines d4-d7 with 4.7k resistor to 5v.

mister_e · 5th February 2009, 02:56 PM

change this

Code:

  CMCON |= 0x07;             // turn off comparators
  ADCON1 |= 0x0F;           // turn off analog inputs

to this

Code:

  CMCON = 7;             // turn off comparators
  ADCON1 = 0x0F;           // turn off analog inputs

and see what happen

Nizar · 5th February 2009, 04:07 PM

I think this is the problem
Thank You very much

ROKE2009 · 6th February 2009, 02:58 AM

Thank You very much

Nizar · 7th February 2009, 07:01 AM

I put putt-up res. but I get nothing.
So, when do LED test on PortA and PortE (without putt-up res.)I get sometning unblieveable: LEDs RA0 and RA1 blink but RA2 and RA3 light without blinking.
On PortE, I get RE0 and RE1 blinked but RE2 does nothing.
But the programm works good on Proteus
This is the Code:

Code:

//CPU Clock 48MHZ
//PIC18F4550
void main()
{
  CMCON = 0x07;             // turn off comparators
  ADCON1 = 0xFF;           // turn off analog inputs

  TRISA = 0x00;               // PORTA is output
  TRISE = 0x00;                // PORTE is output
  
  PORTA = 0xFF;
  PORTE = 0xFF;
  
  while(1)
  {
    Delay_ms(500);          /* 0.5 second pause */
    PORTA = ~PORTA;
    PORTE = ~PORTE;
  }
}

Circuit on Proteus:

Pommie · 7th February 2009, 07:11 AM

Try changing all your port reads to latch reads,
so
PORTA = ~PORTA;
becomes
LATA = ~LATA;

Mike.

Nizar · 8th February 2009, 04:49 AM

I got it due to Your help:
The Problem is that I used PORT instead of LAT
So, thanks for your help special Pommie.
The New code:

Code:

char *text = "Hello World";

void main()
{
  CMCON = 0x07;             // turn off comparators
  ADCON1 = 0xFF;           // turn off analog inputs

  TRISA = 0x00;                         // PORTA is output
  TRISB = 0x00;                         // PORTB is output
  TRISE = 0x00;                         // PORTE is output
  
  Lcd_Custom_Config(&LATA,3,2,1,0,&LATE,2,1,0);  // Initialize LCD on PORTB
  Lcd_Custom_Cmd(Lcd_CURSOR_OFF);                 // Turn off cursor
  Lcd_Custom_Cmd(LCD_CLEAR);
  Lcd_Custom_Out(1, 16, text);
  
  PORTB.F2 = 1;
  
  while(1)
  {
    Delay_ms(300);               // 0.3 second pause
    Lcd_Custom_Cmd(LCD_SHIFT_LEFT);
    PORTB.F2 = ~LATB.F2;
  }
}

ahd71 · 4th June 2009, 08:38 PM

Hi,

I just wanted to say thankyou for the LAT/PORT hint.

I have been troubleshooting this issue for two long evening/nights now looking for soft and hard errors.... !

thankyou / Ahd71

kalindusri · 15th November 2009, 02:09 AM

Thanks it is working.

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5th February 2009, 10:28 AM	#2
yatoof	pull up all data lines d4-d7 with 4.7k resistor to 5v.

5th February 2009, 02:56 PM	#3
mister_e	change this Code: CMCON \|= 0x07; // turn off comparators ADCON1 \|= 0x0F; // turn off analog inputs to this Code: CMCON = 7; // turn off comparators ADCON1 = 0x0F; // turn off analog inputs and see what happen __________________ Steve

5th February 2009, 04:07 PM	#4
Nizar	Thanks, I will try it I think this is the problem Thank You very much

7th February 2009, 07:01 AM	#6
Nizar	Sorry It doesn't work I put putt-up res. but I get nothing. So, when do LED test on PortA and PortE (without putt-up res.)I get sometning unblieveable: LEDs RA0 and RA1 blink but RA2 and RA3 light without blinking. On PortE, I get RE0 and RE1 blinked but RE2 does nothing. But the programm works good on Proteus This is the Code: Code: //CPU Clock 48MHZ //PIC18F4550 void main() { CMCON = 0x07; // turn off comparators ADCON1 = 0xFF; // turn off analog inputs TRISA = 0x00; // PORTA is output TRISE = 0x00; // PORTE is output PORTA = 0xFF; PORTE = 0xFF; while(1) { Delay_ms(500); /* 0.5 second pause */ PORTA = ~PORTA; PORTE = ~PORTE; } } Circuit on Proteus: Attached Thumbnails

7th February 2009, 07:11 AM	#7
Pommie	Try changing all your port reads to latch reads, so PORTA = ~PORTA; becomes LATA = ~LATA; Mike.

4th June 2009, 08:38 PM	#9
ahd71	Hi, I just wanted to say thankyou for the LAT/PORT hint. I have been troubleshooting this issue for two long evening/nights now looking for soft and hard errors.... ! thankyou / Ahd71

15th November 2009, 02:09 AM	#10
kalindusri	Thanks it is working.