hi,
We have simulated a DSF device which supports all four possible types of transfers in USB.
The interrupt and bulk transfers are working fine but we just cannot seem to get the isoch. thing working.
We tried using the usbsamp driver which was provided with WDK KMDF samples but it fails when it tries to send a request to the device( status: INVALID_PARAMETER). Our device has only a single interface with no alternate settings.
Plz advice me on what I could be doing wrong.
xxxxx@wipro.com wrote:
We have simulated a DSF device which supports all four possible types of transfers in USB.
The interrupt and bulk transfers are working fine but we just cannot seem to get the isoch. thing working.
We tried using the usbsamp driver which was provided with WDK KMDF samples but it fails when it tries to send a request to the device( status: INVALID_PARAMETER). Our device has only a single interface with no alternate settings.
You MUST use alternate settings to use an isochronous pipe. Alternate
setting 0 cannot include an isoch pipe (well, it can include one but
only with 0 bandwidth). The other alternate setting(s) will have the
isochronous pipe with bandwidth reservations.
–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.
Thank you for the info Tim… Appreciate it.