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LCD Interfacing Problem with PIC16F877A

 
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07arunsharma



Joined: 05 Mar 2012
Posts: 18
Location: India

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LCD Interfacing Problem with PIC16F877A
PostPosted: Mon Mar 05, 2012 9:13 pm     Reply with quote
Hello everyone i am new to CCS Compiler.
I write a simple code to to display some text on LCD.
But it not works.

Here is my CODE

Code:
#include<16f877a.h>

#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP

#include <lcd.c>

/*#define LCD_ENABLE_PIN  PIN_C0                                    ////
#define LCD_RS_PIN      PIN_C1                                    ////
#define LCD_RW_PIN      PIN_C2                                    ////
#define LCD_DATA4       PIN_D4                                    ////
#define LCD_DATA5       PIN_D5                                    ////
#define LCD_DATA6       PIN_D6                                    ////
#define LCD_DATA7       PIN_D7*/

void main()
{
   set_tris_d(0x00);
   set_tris_c(0x00);
   lcd_init();
    Delay_ms(100);
   while(1)
   {
      lcd_gotoxy(1,1);
      Delay_ms(1000);
      lcd_putc("\fReady...\n");
   }
}


after asking several forums on internet,
someone has given me a file flex_lcd.c

i write the code for that as follow:
Code:

#include<16f877a.h>

#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP

#include "flex_lcd.c"

void main()
{
   set_tris_d(0x00);
   set_tris_c(0x00);
   lcd_init();
    Delay_ms(100);
   while(1)
   {
      lcd_gotoxy(1,1);
      Delay_ms(1000);
      lcd_putc("\fReady...\n");
   }
}


and changed the pin configuration for that, and my lcd program starts working,
so i want to know why the file provided with ccs pic c i.e lcd.c is not working for me...
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Arun Sharma
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Mar 05, 2012 10:21 pm     Reply with quote
You need to place the pin assignment statements above the #include line
for lcd.c. Also, the #define statements must not be commented out.
Example:
Code:

#define LCD_ENABLE_PIN  PIN_C0                                   
#define LCD_RS_PIN      PIN_C1                                     
#define LCD_RW_PIN      PIN_C2                                   
#define LCD_DATA4       PIN_D4                                     
#define LCD_DATA5       PIN_D5                                     
#define LCD_DATA6       PIN_D6                                     
#define LCD_DATA7       PIN_D7

#include <lcd.c>  // This line must go here
 
07arunsharma



Joined: 05 Mar 2012
Posts: 18
Location: India

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PostPosted: Tue Mar 06, 2012 9:34 am     Reply with quote
Thank You very Much,

It works, i was halted at this problem from last 2 month.
today i got solution..
:-)

what is the meaning of "%f"


Thanks alot..
:-)
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Arun Sharma
07arunsharma



Joined: 05 Mar 2012
Posts: 18
Location: India

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PostPosted: Tue Mar 06, 2012 10:37 am     Reply with quote
%f is used to clear the LCD Screen,

what if i want to go to a particular line,
i use statement lcd_gotoxy(1,1);
it means 1st row and 1st columns

while
lcd_gotoxy(2,1);
second row first column not working

Can you tell me why it is so.


Code:

#include<16f877a.h>

#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP

#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,parity=N,bits=8,ERRORS)

#define LCD_ENABLE_PIN PIN_C0
#define LCD_RS_PIN PIN_C1
#define LCD_RW_PIN PIN_C2
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7

#include <lcd.c>

void main()
{
   set_tris_d(0x00);
   set_tris_c(0x00);
   lcd_init();
    Delay_ms(100);
   while(1)
   {
      lcd_gotoxy(2,1);
      Delay_ms(1000);
      lcd_putc("\fArun Sharma");   // /f clears the display
      Delay_ms(1000);
      printf("Serial Communication\n\r");
      Delay_ms(1000);
   }
}


This is not working means Arun Sharma is not displaying on Second line..
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Arun Sharma
temtronic



Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario

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PostPosted: Tue Mar 06, 2012 11:52 am     Reply with quote
...
lcd_gotoxy(2,1);
second row first column not working
..
Have a read of the LCD driver comments at the beginning...

(1,2) not (2,1)
07arunsharma



Joined: 05 Mar 2012
Posts: 18
Location: India

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PostPosted: Tue Mar 06, 2012 12:30 pm     Reply with quote
I have tried all combination..
and it is not written in driver file,

Quote:
///////////////////////////////////////////////////////////////////////////////
//// LCD.C ////
//// Driver for common LCD modules ////
//// ////
//// lcd_init() Must be called before any other function. ////
//// ////
//// lcd_putc(c) Will display c on the next position of the LCD. ////
//// The following have special meaning: ////
//// \f Clear display ////
//// \n Go to start of second line ////
//// \b Move back one position ////
//// ////
//// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) ////
//// ////
//// lcd_getc(x,y) Returns character at position x,y on LCD


This is written,,
Anyways thanks for ur reply,
but still it doesn't works..


Code:
#include<16f877a.h>

#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP

#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,parity=N,bits=8,ERRORS)

#define LCD_ENABLE_PIN PIN_C0
#define LCD_RS_PIN PIN_C1
#define LCD_RW_PIN PIN_C2
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7

#include <lcd.c>

void main()
{
   set_tris_d(0x00);
   set_tris_c(0x00);
   lcd_init();
    Delay_ms(100);
   while(1)
   {
      lcd_gotoxy(1,2);
      Delay_ms(1000);
      lcd_putc("\fArun Sharma");   // /f clears the display
      Delay_ms(1000);
      printf("Serial Communication\n\r");
      Delay_ms(1000);
   }
}


Not working,
Any suggestion pls
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Arun Sharma
gpsmikey



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Posts: 588
Location: Kirkland, WA

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PostPosted: Tue Mar 06, 2012 12:33 pm     Reply with quote
Been a while since I looked at the LCD specs (and they all vary), but I thought there had to be a delay after a "\f" (form-feed / clear display) before you sent it more text ?

mikey
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mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3
PCM programmer



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Posts: 21708

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PostPosted: Tue Mar 06, 2012 2:33 pm     Reply with quote
Quote:
I thought there had to be a delay after a "\f" (form-feed / clear display)
before you sent it more text

It's all handled by the lcd driver. Check the source code in the CCS
Code Library forum.
jeremiah



Joined: 20 Jul 2010
Posts: 1346

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PostPosted: Tue Mar 06, 2012 5:28 pm     Reply with quote
I've not dealt with LCD's much, but does the clear screen in lcd_putc("\fArun Sharma") also reset the position? If so, the lcd_gotoxy(1,2) would be meaningless.
PCM programmer



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Posts: 21708

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PostPosted: Tue Mar 06, 2012 5:47 pm     Reply with quote
Yes, it clears the display and puts the cursor in home position (1, 1).
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