by luke on Sun May 29, 2005 12:06 am
i'm not sure if this will help you, but:
in my case, the usb was recognized, but a couple of the pins were not connected correctly. i can only assume that means that the a couple of the pins are necessary for communication but not for detection.
you should also check the frequencies of your crystals. also, the inductor bead is not listed in the directions as a part needed for the USB system, but it is in the schematic. have you soldered that in?
as a last check, I like to go in with a multimeter and check for connectivity between places that should be connected (i.e. each pin on the PIC and its end point. for example, pin 24 and 25 on the FTDI chip (RX,TX) and pin 43 & 44 on the PIC). Go through each connection used in the necessary system and ensure connectivity.