Objective Development Forums

I solve problem. I call usbPoll() function too rarely. I just add usbPoll() calls into my long funclions, and all works fine. Thanks for help.

I check in addition two machines (with USB 1.1 and 2.0), result is same. I used USB 1.1 cable, maybe USB 2.0 cable will help?

Do you have a scope (storage scope would be ideal) to check the wave forms and levels on D+ and D-? Yes, i have simple scope. I check waveforms on D+ and D-, it's looks different. On usb 1.1 machine waveforms have visually ideal fronts, and on usb 2.0 machine fronts are more longer. Levels in both c...

Hi. I have built device on Mega32. It's work fine on old machines with USB 1.1 controller . But on new machines with USB 2.0 controller, WinXP says "usb device not recognized". My device powered from 3.3 V source (i have same result with Vcc from 3.0 to 3.6 Volts). I've used 68 ohm resisto...