IOUSBDevice->DeviceRequest( ) times out

• Subject: IOUSBDevice->DeviceRequest( ) times out
• From: "Brian Jorgage" <email@hidden>
• Date: Mon, 28 Mar 2005 18:12:44 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I am testing my driver to see if it can run through all the standard 
device requests supported by IOUSBDevice->DeviceRequest().  I am 
running into problems with "bRequest=GET_DESCRIPTOR".  Return code 
keeps coming back as 0xE0004051 - "transaction timed out".  I get the 
same result whether I am querying a device descriptor or a 
configuration descriptor.

Does anyone know how to fix this ?  Is it an issue w/the device 
state ?  Is it a synchronous/asynchronous issue ?  Just as an FYI, 
IOUSBDevice->GetConfigurationDescriptor() works fine.

Brian Jorgage


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