Hi
I'm developing using the USB setup using an 18F4550 using a 20MHz xtal, to run a number of SPI devices. I have both the USB and SPI running in seperate programs to ensure their operation, however, when I merge the programs and extend the command set in user.c, when I access any SPI commands, teh device locks up and is no longer recognised as a USB device - one of the LEDs flashes rapidly.
I have simplified the code, only writing one byte on the SPI - added to one of teh existing command codes, and the device still ocks up. Is there something I might be missing - does the SPI module have any impact on the operation of the USB module in the PIC.
Your help would be appreciated.
Thanks
JohnL
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