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uma
Joined: 17 Apr 2014
Posts: 29
Location: chennai
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| Problem with 16f877a code writing for lcd interface |
 Posted: Thu Apr 17, 2014 11:30 pm |
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Error msg: cannot change device type this far into the code. (line2)
| Code: |
#include <pgm1.h>
#include <16F877A.h>
//#fuses XT,NOWDT
#use delay(clock=20000000)
#include <lcd.c>
#define lcd_RD4 PIN_RD0
#define lcd_RD5 PIN_RD1
#define lcd_RD6 PIN_RD2
#define lcd_RD7 PIN_RD3
#define lcd_E PIN_RB1
#define lcd_RS PIN_RB2
void main()
{
set_tris_d(0x00);
set_tris_b(0x00);
output_d(0x00);
output_b(0x00);
delay_ms(1500);
lcd_init();
delay_ms(500);
//lcd_cursor_on(1,TRUE);
//for(;;)
while(TRUE)
{
lcd_gotoxy(1,1);
Printf(lcd_putc,"/f welcome to ETPL");
delay_ms(500);
lcd_gotoxy(1,2);
Printf(lcd_putc,"/n LCD interface");
delay_ms(500);
}
}
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_________________
uma
Application Engineer,
ETPL |
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Apr 18, 2014 1:48 am |
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The error message is telling you what to do.
Try putting
| Code: | | #include <16F877A.h> |
as the first line, rather than second.
Mike |
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uma
Joined: 17 Apr 2014
Posts: 29
Location: chennai
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| Posted: Fri Apr 18, 2014 3:13 am |
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I tried that too as you said, and i have made little changes also,even then it is showing errr.
| Code: |
#include <16F877.h>
#include <pgm1.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#define lcd_DATA4 PIN_D0
#define lcd_DATA5 PIN_D1
#define lcd_DATA6 PIN_D2
#define lcd_DATA7 PIN_D3
#define lcd_ENABLE_PIN PIN_B1
#define lcd_RS_PIN PIN_B2
#include <lcd.c>
void main()
{
set_tris_d(0x00);
set_tris_b(0x00);
output_d(0x00);
output_b(0x00);
delay_ms(1500);
lcd_init();
delay_ms(500);
while(TRUE)
printf(lcd_putc,"/f welcome to ETPL");
delay_ms(500);
lcd_gotoxy(1,2);
Printf(lcd_putc,"/n LCD interface");
delay_ms(500);
}
|
how to attach the error screen shot with this?
_________________
uma
Application Engineer,
ETPL |
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Apr 18, 2014 4:33 am |
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You can copy and paste to show error messages.
What is the error you are now getting?
Your code is not complete and compilable.
I don't have your pgm1.h file
Therefore, I can't readily test your code on my system.
At this stage you are making me second guess what you have done.
If you want help, you need to make it easy for us.
Mike |
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uma
Joined: 17 Apr 2014
Posts: 29
Location: chennai
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| i have simplified the code and now no result in simulation. |
| Posted: Fri Apr 18, 2014 5:11 am |
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| Code: | #include<16f877a.h>
#use delay(clock=20000000)
#fuses HS,NOWDT,NOPROTECT,NOLVP
#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(1,1);
Delay_ms(1000);
lcd_putc("\f Hello ETPL...\n");
}
} |
Here is the link of screen shot of simulation:
http://www.2shared.com/photo/aQY7aQyF/proteus_disp.html
http://www.2shared.com/photo/tOFGqXrt/warning_msg.html
_________________
uma
Application Engineer,
ETPL |
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uma
Joined: 17 Apr 2014
Posts: 29
Location: chennai
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| solved,mstke is connection. |
| Posted: Fri Apr 18, 2014 5:53 am |
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connected the D4,D5,D6,D7 PIN of MCU to D0,D1,D2,D3 is the problem.
Again i connected it to D4,D5,D6,D7 pin of LCD and grounded the upper nibble.
_________________
uma
Application Engineer,
ETPL |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Apr 18, 2014 8:40 am |
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I refuse to deal with Proteus/ISIS issues.
Come back when you are using real hardware.
This line deals with the pin connections
You therefore don't need these
| 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 |
You don't need these lines. The CCS compiler deals with I/O's
| Code: | set_tris_d(0x00);
set_tris_c(0x00); |
The list goes on ..........................
Your link to the screen shot was a waste of my time and effort.
Mike |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Fri Apr 18, 2014 10:36 am |
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to begin with... if you wired up the project according to your schematic..it'll never work !!!
1) no xtal or caps on PIC clk pins.
2) no power to PIC
3) not supposed to ground LCD data pins...
3 strikes and I'm out.
Happy to help but come back with real hardware.....
jay |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Apr 18, 2014 1:33 pm |
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Connect your LCD according to this schematic:
http://2.bp.blogspot.com/-8xC4RgF8scM/TxlLYKaSFaI/AAAAAAAAACk/7FODBf0jvRo/s1600/Schematic.png
Compile and run this test program below, and it should work.
This program uses the CCS lcd.c driver, and it defaults to using PortD for
the lcd. The schematic in the link above uses PortD, exactly as required
by the CCS lcd.c driver.
| Code: |
#include <16F877A.h>
#fuses XT, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)
#include <lcd.c>
//==========================================
void main()
{
delay_ms(500);
lcd_init();
printf(lcd_putc, "\fHello World");
while(1);
} |
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uma
Joined: 17 Apr 2014
Posts: 29
Location: chennai
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| RE: problem of lcd interface |
| Posted: Sat Apr 19, 2014 12:22 am |
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Thanks for everyone who replied, sorry if anyone of you feel that i have wasted your time.
I am struggling because i am new to this field,so i am working from basic.
_________________
uma
Application Engineer,
ETPL |
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