Editing the MCHPFSUSB firmware for pic18f2455

Hi there. I've got an absolute ton of info on USB but it's all for the pic18f4550. I'm currently trying to edit the HID Mouse example in the MCHPFSUSB firmware pack but theres quite a bit to change. Additionally, there's alot of code concerning demo board kits (which i'm not using). Has anyone successfully got this or any of the USB examples working for the PIC18f2455 or any other undefined PIC? If so a point in the righ direction would be much appreciated!

Thanks.

PS: I'm using a ECIO28p module which has a bootlader already integrated onto the PIC (i also have the edited 18f2455 linker file to make room for the bootloader) but if this too complex to change for USB firmware code then i'll use a standard 2455 attached to a USB female plug.

Here are a few projects using the pic18f4550 and USB:

DAQ and PIC USB



PIC and USB Development


Hope these get you rolling!

Yes!

I have done lots of USB applications using PIC24FGBXXXX though.

The code stack is almost the same though... You need to change the hardware profile first. This is where all of the Inputs/outputs are mapped. OF course, it will complain, so modify all the functions using the changed pins to comply with your code. Doing this, you will probably find out how a frame is sent exactly too.


You don't need to change the pin map for USB, since the name is the same throughout the range (not remap-able)

Once this is done, you will need to redefine the usb_descriptor.c in order to fit your application. You will mainly need to change the class definition and the HID descriptor.

If you have more questions, don't hesitate.