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LCD, keypad & 18f452

 
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pixie



Joined: 14 Dec 2004
Posts: 3

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LCD, keypad & 18f452
PostPosted: Fri Dec 17, 2004 12:45 pm     Reply with quote
Hello, I am new in PIC tecnology and I need to implement and LCD controlled by a keypad with a 18F452. I have tried with the libraries included in the CCS and with another ones that I have found on the forum and the web and it don't work.

If some one could put in the forum a complet example (all the code, and the schema) of this I will be very grateful for you.

Thank you very much.
pixie



Joined: 14 Dec 2004
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PostPosted: Fri Dec 17, 2004 12:47 pm     Reply with quote
The LCD are based in the hd44780.

Thanks.
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Fri Dec 17, 2004 1:42 pm     Reply with quote
Here is a complete and working program to test the LCD.
Code:

#include <18F452.h>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#include "lcd.c"

void main()
{
  lcd_init();
  printf(lcd_putc,"First Line");
  printf(lcd_putc,"\nSecond Line");
  while(1);
}
asmallri



Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia

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PostPosted: Fri Dec 17, 2004 7:08 pm     Reply with quote
Quote:
Here is a complete and working program to test the LCD.


To be complete it would have to define the target specific pin mappings somewhere. Ideally you don't want to do this in the generic driver file so instead you would need to include a target specific header file that contains the mapping
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Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Sat Dec 18, 2004 12:10 am     Reply with quote
Well he didn't list any. I have a demo board that uses the ones spelled out in lcd.c so this is a complete and working test program Razz
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