XLCD-18F4525 not working !! - Electronic Circuits Projects Diagrams Free

loup-garou · 10th May 2008, 06:23 PM

Hi there,

I used XLCD library in my C code, to display a message on LCD Display (2x16, with HD44780 LCD controller) using the PIC18F4525, I compilled the programm successfully, and made a schematic on ISIS in order to simulte it but, I failed to get anything to display !!!

besides the PORTA0 which is configurated as DATA PORT remaind in low level during simulation, on the other hand PORTB (which is not used in my application) had varied level in its outputs (see joined picture).

what is the resaon of this abnormality ?
I have another question, does the ISIS LCD display include the HD44780 LCD controller , or should I add it from the libray the scheme?, if it's the cas how will I display ??

I joined my project compiled+ISIS simulation file+ a prints screen of ISIS schematic.

thanks in advance.

richard.c · 10th May 2008, 07:41 PM

Hi,

Not into C so cannot help you with the code, but the attached file does display correctly.

No need to connect pins 1,2,3 - lcd pin5 R/W, if unused, is taken directly to 0v and not connected to the Pic.

The display is the standard Isis library item.

hth

richard.c · 10th May 2008, 07:47 PM

Ops,

Should have said that the standard Isis lcd does include the HD44780 controller.

loup-garou · 10th May 2008, 07:54 PM

Quote:

Originally Posted by richard.c

Hi,

Not into C so cannot help you with the code, but the attached file does display correctly.

No need to connect pins 1,2,3 - lcd pin5 R/W, if unused, is taken directly to 0v and not connected to the Pic.

The display is the standard Isis library item.

hth

Hi Richard.c

thanks for answering me,

I disconnected pins 1, 2, 3 (why doing this ?) and R/W from PIC, but nothing has changed !!

richard.c · 10th May 2008, 08:24 PM

Hi,

Pins 1,2,3 are taken care of by Isis as a standard connection.

The Isis design should work - but not knowing C cannot help directly.
From my experiences with assembler LCD code, the slightest error and nothing works - its always a difficult routine to set up.

Do a search on this forum for 'C and LCD' for previous similar questions.

Also, give it a few more hours for the Earth to spin around - sure others will soon help you with this problem

arhi · 10th May 2008, 08:26 PM

here is the isis schematic with hex file that works

it is standard text lcd

as for the code .. I use mikroC mostly and it has libraries for lcd etc..

Code:

void main(){

  Lcd_Init(&PORTD);

  Lcd_Cmd(Lcd_CLEAR);

  Lcd_Cmd(Lcd_CURSOR_OFF);

  Lcd_Out(1, 1, "LCD Test");

  Lcd_Out(2, 1, "1234567890123456");

  while(1){ asm {nop} }

}

loup-garou · 10th May 2008, 08:44 PM

Quote:

Originally Posted by richard.c

Hi,

Pins 1,2,3 are taken care of by Isis as a standard connection.

The Isis design should work - but not knowing C cannot help directly.
From my experiences with assembler LCD code, the slightest error and nothing works - its always a difficult routine to set up.

Do a search on this forum for 'C and LCD' for previous similar questions.

Also, give it a few more hours for the Earth to spin around - sure others will soon help you with this problem

thank you for your advices richard.c

loup-garou · 10th May 2008, 08:47 PM

Quote:

Originally Posted by arhi

here is the isis schematic with hex file that works

it is standard text lcd

as for the code .. I use mikroC mostly and it has libraries for lcd etc..

Code:

void main(){

  Lcd_Init(&PORTD);

  Lcd_Cmd(Lcd_CLEAR);

  Lcd_Cmd(Lcd_CURSOR_OFF);

  Lcd_Out(1, 1, "LCD Test");

  Lcd_Out(2, 1, "1234567890123456");

  while(1){ asm {nop} }

}

hi arth,

firstly, thank tou for helping me with this code + simulation file

secondly, it seems to be much less complicated than XLCD library and files, but I can't change from it cause I'm using MPLAB enviorement and hence C18 compiler of Microchip for beter compatibilty.

arhi · 10th May 2008, 08:57 PM

Quote:

Originally Posted by loup-garou

it seems to be much less complicated than XLCD library and files, but I can't change from it cause I'm using MPLAB enviorement and hence C18 compiler of Microchip for beter compatibilty.

I believe C18 might be better in many ways (not only compatibility) then other compilers, but as I usually have to work with 12(F|C)* and 16F* so I use PICC and mikroC .. Never tried C18 so cannot compare it to others.

Look for some LCD examples in C18, and get them to work first. ISIS is a big help there as it can simulate the whole circuit .. attach a graph to whole PORTD and run your software, maybe you connected it wrong (maybe you should use D4-D7 and not D0-D3 )

loup-garou · 10th May 2008, 09:11 PM

Quote:

Originally Posted by arhi

I believe C18 might be better in many ways (not only compatibility) then other compilers, but as I usually have to work with 12(F|C)* and 16F* so I use PICC and mikroC .. Never tried C18 so cannot compare it to others.

Look for some LCD examples in C18, and get them to work first. ISIS is a big help there as it can simulate the whole circuit .. attach a graph to whole PORTD and run your software, maybe you connected it wrong (maybe you should use D4-D7 and not D0-D3 )

thank you for advices arth, but the problem is somewhere else I think.

Concerning ISIS, this soft does not simulate corretly with some components/circuits, here is an exemple I've faced and you can try it by yourself:

the ULN2083 seems to be a faulty component, I tried several times to command relays with it, but despite the circuits were correct I wasn't able to excite the coil and turn on the relay.

arhi · 10th May 2008, 09:15 PM

I do not have ULN2083 in ISIS, only ULN2001/2002/2003/2004 so I cannot try ... and those 4 simulate ok.

loup-garou · 10th May 2008, 09:23 PM

Quote:

Originally Posted by arhi

I do not have ULN2083 in ISIS, only ULN2001/2002/2003/2004 so I cannot try ... and those 4 simulate ok.

sorry, I mean ULN2803.

I'll be very pleased, if you send me the simulation file of one of those ULN !

bryan · 10th May 2008, 11:52 PM

Hello;

I had the same problems, I will upload a C18 LCD project that should get you back on track , but can't do it right know. Check back later or tomorrow.

-=Bryan=-

Quote:

Originally Posted by loup-garou

Hi there,

I used XLCD library in my C code, to display a message on LCD Display (2x16, with HD44780 LCD controller) using the PIC18F4525, I compilled the programm successfully, and made a schematic on ISIS in order to simulte it but, I failed to get anything to display !!!

besides the PORTA0 which is configurated as DATA PORT remaind in low level during simulation, on the other hand PORTB (which is not used in my application) had varied level in its outputs (see joined picture).

what is the resaon of this abnormality ?
I have another question, does the ISIS LCD display include the HD44780 LCD controller , or should I add it from the libray the scheme?, if it's the cas how will I display ??

I joined my project compiled+ISIS simulation file+ a prints screen of ISIS schematic.

thanks in advance.

arhi · 11th May 2008, 12:01 AM

Quote:

Originally Posted by loup-garou

sorry, I mean ULN2803.
I'll be very pleased, if you send me the simulation file of one of those ULN !

No ULN2803 neither in my ISIS

arhi · 11th May 2008, 12:16 AM

Quote:

Originally Posted by loup-garou

I'll be very pleased, if you send me the simulation file of one of those ULN !

Attached circuit with ULN2004A, but we are going too much off topic. If you have further problems with ULN2* please open separate thread for them (and not in uC section)

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10th May 2008, 07:47 PM	(permalink)
richard.c	Ops, Should have said that the standard Isis lcd does include the HD44780 controller.

10th May 2008, 08:24 PM	(permalink)
richard.c	Hi, Pins 1,2,3 are taken care of by Isis as a standard connection. The Isis design should work - but not knowing C cannot help directly. From my experiences with assembler LCD code, the slightest error and nothing works - its always a difficult routine to set up. Do a search on this forum for 'C and LCD' for previous similar questions. Also, give it a few more hours for the Earth to spin around - sure others will soon help you with this problem

10th May 2008, 09:15 PM	(permalink)
arhi	I do not have ULN2083 in ISIS, only ULN2001/2002/2003/2004 so I cannot try ... and those 4 simulate ok. __________________ http://www.it4um.com