USB and I2C Wont work at that same time.

[Guest]

Yes 'Aargh' is the polite version. Its was a bit more animated than that!

again,Thanks for all your help.

Gary

[Dimlow]

Just thought id give a little update and some info for people that may get stuck with this them self's.

In my main code, not the test code i was still having trouble with the usb, where on some compiles the usb would work and on others is would not. all i had to do was to add one line of code and the usb would stop working. this line of code could be completely unrelated to the usb. for example printf. i was really pulling my hair out over this one.

anyway it turns out that all along it was an interrupt handler i had for my keypad that was doing the damage. this code has been used many times before and i have had no reason to suspect that it would give me troubles. I think the various code optimizations that the compiler does, was somtimes making it faster, and somtimes not. On some occasions it was taking to much time, just long enough for it to stop the usb interrupt from working! the pc would then inform me that it found an unknown device and i lost more hair! In the end,i have stopped using interrupt for the keypad and its all working very well now, During the past week i must have gone through every bit of code in the program, found a few unrelated bugs and made things much smoother now.

The i2c problems i was having was not related to my usb problem, they just both poped their heads up at the same time witch just made things worse!

Right time for some real coding seems all i have been doing lately is debug debug debug.

Gary