USB Bootloader.

[ardhuru]

Success at last!

Walter, I have to thank you for this.

BTW, the 2 files are not quite the same; the names do look identical, but then I noticed the first one was for 18F4450 and the second for 18F4550. In fact that gave me a clue; my device was a 18F4455, and I was using the firmware for 18F4550. Works, but gives the error I kept referring to.

Swapping in an 18F4550 completely solved all problems.

So, on to the next task. Once I figure out how to generate a hex file for the 18F4455, I'd be a truly happy camper.

Will update this thread soon as I do the above!

Thanks again,

Anand

[Bruce]

Hi Anand,

See if the attached works on your 18F4455. I've include default config settings, and a note
on switching between load/run modes, interrupts, etc in the text file.

[ardhuru]

Bingo!

Bruce, it worked flawlessly.

How exactly did you generate it?

Thanks a lot, that was the last obstacle that you removed!

Anand

[Bruce]

Hi Anand,

I compiled the original loader for your 18F4455. If you have C18, and want to change it yourself, here's how;

1. Open the project in MPLAB.
2. Remove the 18F4550 linker.
3. Add the 18F4455 linker. (be sure to use the modified versions in the same folder)
4. Select the 18F4455 under Configure > Select Device (almost forgot this one)
5. Include the 18F4455 in the section shown below in main.c.

Original looks like this;

#if defined(PIC18F4550_PICDEM_FS_USB)		// Configuration bits for PICDEM FS USB Demo Board
 	#if defined(__18F4550) || defined(__18F4553)

Change it to;

#if defined(PIC18F4550_PICDEM_FS_USB)		// Configuration bits for PICDEM FS USB Demo Board
 	#if defined(__18F4550) || defined(__18F4553) || defined(__18F4455)

Then compile. This forces it to use the config options below the #if defined section, and you definitely need the 18F4455 linker due to the difference in codespace.

[HenrikOlsson]

Guys,
I haven't had time to play any more with this and it will have to wait a little longer still. However, I'd like to take the oportunity to thank all of you for the last couple of days worth of posts in this thread!

/Henrik.

[ardhuru]

Bruce, thanks for the procedure to create new .hex bootload files. Do I understand the situation right, that one necessarily requires the C18 compiler to do this?

And, I second Henrik's statement, thank you to all who helped.

Regards,

Anand

[Bruce]

Hi Anand,

Yes. You will need the C18 compiler to make changes.