USB Serial port communication for pic18f2550

nando88 · Joined: 25 Aug 2013 Posts: 28

I was able to make my application work with the help I received in this forum, but that was when I was using the pic 18f4550.
Now I'm using a dev board with the pic18f2550, and I changed the include in my code, but when I install the driver, I get error code 28.
If someone could please help me fix this problem, I would be so grateful.
I will leave the code I'm using in this link:
http://www.mediafire.com/download/igswpdai4padduk/Working_Code_-_Pic18f4550.zip
This is the code that I used to get my app working with the pic18f4550.
I just need to be able to use this same code, but with pic18f2550.
The only thing is that in order for me to upload this code to my dev board, the hex file can't have any comments in it, so I have to erase the last 2 lines in this file. I really don't know if this makes any difference.
Thanks.

temtronic · Posted: Thu Dec 25, 2014 6:27 pm

First is the HARDWARE correct? 2550 is a 28 pin device not a 40 , so be sure you've got the right pins going to the correct places !!

Second, your 'working code'... does NOT have the first line such as ...
#include <18f2550.h> //PIC header MUST be 1st line in program

... without this, compiler will halt as it doesn't know which PIC you're using !

Since the ONLY differences i can easily see are these two items, try them and see

recode/recompile/retest/report back

hth
jay

nando88 · Joined: 25 Aug 2013 Posts: 28

I know what you mean, when you say there is no include in the main file, but the thing is that it worked fine with the pic18f4550 dev board. I think its because I'm importing the usb_desc_cdc, and the ex_usb_common.
I tried changing the includes in those files, so that I could get this code working for this other dev board, but I get error code 28, when I install the driver.
I'll have to change the output pins, but that is all I can think of.

Ttelmah · Joined: 11 Mar 2010 Posts: 19520

Not quite.

It's because the usb_common file you have has been modified.

There is an option in this, just after the initial 'remarks', to have a number of different processors selected - section marked 'Begin User Configuration'. You remove the 'rem' for the processor you want to use for a number of 'standard' configurations. The first one, selects the 4550:

nando88 · Joined: 25 Aug 2013 Posts: 28

I made the changes you suggested, but I still get the error, when installing the driver provided by ccs.
I get error code 28.
Here is the code:
http://www.mediafire.com/download/8ib2nz7tzq97wgt/Pic18f2550.zip
Any help will be greatly appreciated.

temtronic · Posted: Fri Dec 26, 2014 12:04 pm

Please post the text surrounding the 'error 28' that you're getting. I downloaded your zip file, and the .err file only has 2 WARNINGs no errors.
CCS list the errors as text in the manual,not by error number so I can't xref 28.

edit: OK I googled ccs c compiler error 28 and got this...
*** Error 28 "C:\Users\Orazio\AppData\Roaming\PICC\Projects\TCPIP Stack\GenericTypeDefs.h" Line 64(28,29): Expecting an identifier
...
So I'm assuming you got something similar
Error 28....*** Error...... Expecting an identifier

???

jay

nando88 · Joined: 25 Aug 2013 Posts: 28

The problem I had was with the os. It did not allow me to install any drivers.
I just fixed the problem and got my app working thanks to you guys.