Problem with startup of self developed USB device...how to debug ? Without USB hardware analyzer...

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

I would think that, when developing USB devices, one of the first sane things 
to do, is to get a USB analyzer...


"Martin Maurer" <Martin.Maurer@clibb.de> schreef in bericht 
news:42ec9c6f$0$40024$892e7fe2@authen.white.readfreenews.net...
> 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
>
> 

Hi Martin,


> i have a self developed device (USB 2.0, full speed) ...

Which chip and manufacturer?

> Any tricks how to start to debug with such bugs ?

How to start:
Made a simple sample with the chip on bredboard, based on a 
manufacturers application note.

For myself I build one with a PIC 18F2550 + crystal, 2 LED, 3 jumper, 1 
poti and some C and R. With the sample code I made my 1st steps in 
shortest time.


Michael