PIC microprocessor USB
How to connect a PIC microprocessor to a computer’s USB interface.
Links:
Microchip forums
a PIC USB project
a PIC USB library
Microchip forum on a Nuts ‘n Volts article on PIC USB using the SDCC compiler
PUF: PIC USB Framework
Nuts ‘n Volts HID demo Rebuilt
SDCC – Small Device C Compiler