Need help on ht-picc lcd routine

[arash]

Hi all.
In Ht-picc ther is a lcd sample that i want to make a little change in it.I change the data

port to portb .but when i change the rs and rw pin to RB4 & RB5 the lcd doesn't work and i

must make all pins to one port.
What shall i do now?

[Zaphod Beeblebrox]

Hi Arash,
I don't fully understand your problem, more description is needed. Anyway, here is my sample code that I succesfully implemented using Hi-Tech PICC 8.05 PL2. The configuration is as follows:
MCU: PIC16F877A
RD0-RD3: LCD DB4-DB7 (LCD in 4-bit mode)
RD5: LCD RS
RD6: LCD R/W
RD7: LCD EN

Fragments of my code:
 

Code:

/* LCD bit definition */
static bit LCD_RS	@ ((unsigned) &PORTD * 8 + 5);	// Register select
static bit LCD_RW     @ ((unsigned) &PORTD * 8 + 6);	// Read / Write
static bit LCD_EN	@ ((unsigned) &PORTD * 8 + 7);	// Enable


/* MCU init sequence */
TRISD = 0b00010000;  // LCD data port init
DelayMs(100);
PORTD = 0x00;
DelayMs(100);

/* LCD init sequence */
LCD_RW = 0;		// write to LCD mode
LCD_EN = 0;
LCD_RS = 0;		 // write control bytes
DelayMs(30);		// power on delay
PORTD = 0x3; 	  // Write LCD mode
lcd_strobe();
DelayMs(5);
lcd_strobe();
DelayUs(100);
lcd_strobe();
DelayMs(5);
PORTD = 0x2;	   // Set 4-bit mode
lcd_strobe();
DelayUs(40);
lcd_write(0x28);	// Function Set - 4 bit mode, 1/16 duty, 5x8 font
lcd_write(0x08);	// display off
/* Display Control => 00001DCB: D - Display ON/IFF, C - Cursor ON/OFF, B - Blink Cursor ON/OFF */
lcd_write(0b00001100);	// display on, blink curson on
lcd_write(0x06);	// entry mode

This code is working just fine for me. It should work properly if you change the code to accept port B.
Good luck.

[Cortex]

check that you have the RB4 & RB5 as output
regards

[arash]

Hi Zaphod Beeblebrox, can you share your full project.

[Zaphod Beeblebrox]

Sorry pal, the code I gave you is a part of a commercial project I work on. I can't share whole project and to be honest it's a rather large amount of code.

I can help you with your code anyway.

[BLK]

Hi Arash, put your code to see wath not work

[manuelroin]

put your code to try help u !