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07arunsharma
Joined: 05 Mar 2012
Posts: 18
Location: India
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| LCD Interfacing Problem with PIC16F877A |
 Posted: Mon Mar 05, 2012 9:13 pm |
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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");
}
}
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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...
_________________
Arun Sharma |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Mar 05, 2012 10:21 pm |
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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
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07arunsharma
Joined: 05 Mar 2012
Posts: 18
Location: India
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| Posted: Tue Mar 06, 2012 9:34 am |
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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..
:-)
_________________
Arun Sharma |
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07arunsharma
Joined: 05 Mar 2012
Posts: 18
Location: India
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| Posted: Tue Mar 06, 2012 10:37 am |
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%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);
}
}
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This is not working means Arun Sharma is not displaying on Second line..
_________________
Arun Sharma |
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temtronic
Joined: 01 Jul 2010
Posts: 9134
Location: Greensville,Ontario
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| Posted: Tue Mar 06, 2012 11:52 am |
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...
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) |
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07arunsharma
Joined: 05 Mar 2012
Posts: 18
Location: India
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| Posted: Tue Mar 06, 2012 12:30 pm |
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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
_________________
Arun Sharma |
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gpsmikey
Joined: 16 Nov 2010
Posts: 588
Location: Kirkland, WA
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| Posted: Tue Mar 06, 2012 12:33 pm |
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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
_________________
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 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 06, 2012 2:33 pm |
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| 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. |
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jeremiah
Joined: 20 Jul 2010
Posts: 1320
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| Posted: Tue Mar 06, 2012 5:28 pm |
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| 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. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 06, 2012 5:47 pm |
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| Yes, it clears the display and puts the cursor in home position (1, 1). |
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