I have the smaller slower version of the MK22F chip set on my custom board the MK22F12810 chip. I'd like to get a USB stack running on this chip, but there isn't a usb platform build for this chip. I've successfully used the FRDM-K22F board and ran a simple keyboard hid usb application. Is there a way I can modify the MK22F51212 platform, so I can build and run the same keyboard demo on the MK22F12810 chip? Or is there another approach I should be doing to get this kind of application running?