HID Bootloader + CDC

ljunior · Joined: 26 Apr 2011 Posts: 4 Location: Brazil

Hi,

I developed a board using Microchip HID Bootloader and now I'm trying to implement a CDC in this board using CCS CDC example. The CDC code is working right.

The problem I had is that the computer recognize the CDC device but I can't communicate. I just tried an echo code.

Is it possible to implement a CDC over the Microchip HID Bootloader?

Thanks

fkl · Joined: 20 Nov 2010 Posts: 44

temtronic · Posted: Sun May 26, 2013 5:13 am

PIC101

1) which PIC

2) which compiler

3) which version of compiler

4) from what you've said(CDC working) then your PC understood the PIC code fine(PIC OK, wiring,PC software)....so your bootloader code is faulty(not loading the CDC program correctly or once the PIC is rebooted,fails to run correctly)

I'd examine the burned PIC to check the CDC pgm code and compare to your known good,running CDC code.Easy to do ,just read the PIC,save the code,twice, then open both files and see what's different.

hth
jay

fkl · Joined: 20 Nov 2010 Posts: 44

Ttelmah · Joined: 11 Mar 2010 Posts: 19545

One thing. Remember that the bootloader, will not program the fuse settings. It can't, since they need to be 'right for it' for it to work.
If your fuses in the CDC, do not match those used in the bootloader, the clock rate being selected may not be the same, and then then the code won't run once loaded with the booloader.
Load the bootloader into MPLAB, and check what it's fuse settings are.
Then change those in the CDC to match, and if necessary change the [spam] statement to match, and recompile.
Also (obviously), the CDC needs to be compiled to load with it's load address set to match what the bootloader expects. #build. A version built to load and run from a programmer, won't run if loaded with a bootloader.

Best Wishes

fkl · Joined: 20 Nov 2010 Posts: 44