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How do I open, close, and then reopen a device driver?

Posted on 2009-07-16
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Last Modified: 2013-12-14
I have WinUSB installed as the driver for a USB device and everything seems to work fine the first time I access the device, I can read and write to the device. Once I close the device handles (bResult=WinUsb_Free(myDevInfo.winUsbHandle); and bResult=CloseHandle(myDevInfo.deviceHandle);), run my open routine, which worked the first time, I can not read from the device any more. bResult in both of the above statements returns TRUE, so the resources for WinUSB should have been released. Am I missing something, why can I not open the device, close the device and then open it again? I am writing the code in VC++ 6.0.
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Question by:Eric_Braun
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5 Comments
 
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Expert Comment

by:jkr
ID: 24886284
Are you calling 'WinUsb_Initialize()' (http://msdn.microsoft.com/en-us/library/aa476455.aspx) again after reopening the device?
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by:trinitrotoluene
ID: 24887845
you need to pass the device interface to the initialize routine...so each time an enumeration has to be done so that you get the list of device interfaces.

Are you doing this in your intialize routine?
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Eric_Braun earned 0 total points
ID: 24984525
Sorry for not responding to any of these comments. Everytime I went to view the comments all I would get was a blank screen, think I had a bad cookie or something. Anyways that aside, I have solved this issue, worked around, all though I still am not sure why I had the issue to start with. Yes, I do 'WinUsb_Initialize()' after reopening the device and I do set and read the device interfaces. What I had to do to get this to work was after running WinUsb setup routines, loading the device firmware,  I had to issue a WinUsb_ResetPipe on the IN and OUT pipes. This takes the pipes out of any stall that may have happened, which is what seems to be happening for some reason when the device is reopened, but not the first time it is opened.
Eric
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