Hello,
i have a self developed device (USB 2.0, full speed) which seem to make problems during connecting. WinXP tells me unknown device, VID and PID are both 0. I tried to monitor exchanged frames SnoopyPro seems to capture only frames when a valid VID/PID is available, not before... Because i have no access to a CATC or other hardware monitor, what posibilities are there to track down this error ? Is there any program which can monitor more of startup phase ?
When i connect the device to my WinXP machine with USB 2.0 (and same at Win2K laptop with USB 1.1), i see three times a GET_STATUS request to device and a USB_EVENT_IN to endpoint 0, which i perhaps not answer correctly, than it is silent, no more requests. WinXP tells me unknown device. When i reconnect, same again, three status requests and the USB_EVENT_IN. .
Any tricks how to start to debug with such bugs ?
Regards,
Martin