uC seems to be communicating then stops

[ScherzkeCks]

Hi there,

I am new to V-USB and build up this circuit:


I am just trying to turn on and off an LED (basically the first example project).

Now if I look with an Oscilloscope at D+ and D- I see the following for about half a minute:



after that D- (yellow) just goes to 3.12V and D+ to 0V

At no time the device shows up in my Systeminfo.

I probably should mention that my host machine is a Mac and I am trying to access my Device using libusb but I don't even get that far because my System doesn't recognize my uC.


Greetings
Stefan

[declan smith]

Hi Stefan,
Please post the full schematics of the AVR example project that you worked with, I'll try to post the hexfile to make sure there's no hardware issues.

Troubleshooting according to V-USB website:
http://vusb.wikidot.com/troubleshooting

[ScherzkeCks]

Thank you very much, but I just found it.

I accidentaly put the usbPoll() before my main-Loop. It's embarrasing...

Thanks for your offer

Greetings

Stefan