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pin mapping in LCD.C

 
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giopic



Joined: 26 Aug 2009
Posts: 4
Location: Padova - Italy

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pin mapping in LCD.C
PostPosted: Wed Aug 26, 2009 1:29 am     Reply with quote
I'm trying to use LCD.C driver with a LCD module connected to a PIC16F876 with the following connections:
Quote:
LCD <---> micro
D4 <---> RB0
D5 <---> RB1
D6 <---> RB2
D7 <---> RB3
E <---> RB4
RS <---> RB5
R / W <---> ground


I edit LCD.C driver in this way:
Quote:
// Un-comment the following define to use port B
#define use_portb_lcd TRUE


struct lcd_pin_map {
int data : 4; // assegna le linee dati del LCD ai pin RB0 - RB3
BOOLEAN enable; // assegna ENABLE al pin RB4
BOOLEAN rs; // assegna RS (dati/istruzioni) al pin RB5
// BOOLEAN rw; // RW a massa
BOOLEAN unused1; // lascia libero il pin RB6
BOOLEAN unused2; // lascia libero il pin RB7
} lcd;

and I comment 3 lines with " lcd.rw = 0;"

This is the simple test program I'm using:
Quote:
#include <16F876.h> //richiama il file di impostazioni per il PIC16F876

#use delay(clock=4000000) //questa spam è necessaria perché LCD_DEMO.C usa delay_us()

#include <LCD_DEMO.C> //edited version of LCD.C


void main() {

lcd_init();
lcd_gotoxy(1,1);
lcd_putc("PRIMA spam");

}
but I don't see any character in the screen. It seems (not sure) that LCD is initialized.

May be the problem is in the line with " int data : 4;" ?
Is there an alternative way to specify the data lines of LCD ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 26, 2009 1:43 am     Reply with quote
Use the flex driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
Edit the #define statements at the top of the driver to match the pins that
you're using, and comment out this line in the driver:
Quote:
// #define USE_LCD_RW 1

Make sure your contrast voltage is set correctly. A good starting point
is about 0.5 volts.
giopic



Joined: 26 Aug 2009
Posts: 4
Location: Padova - Italy

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PostPosted: Wed Aug 26, 2009 10:05 am     Reply with quote
It works and it's easy to configure. Thank you very much.
Just to know would it possible to use LCD.c for the same application ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 26, 2009 11:40 am     Reply with quote
Quote:

Just to know would it possible to use LCD.c for the same application ?

Read this thread and the link in it.
http://www.ccsinfo.com/forum/viewtopic.php?p=45146
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