Re: [Pyusb-users] Timer Expired

[Santiago P. Sanchez-M. <sp...@gm...>]

I think you need to release (de-claim) the device before closing your app.
handle.close() maybe ... long time since I programmed with the lib


On Mon, Dec 15, 2008 at 2:24 PM, Christopher Moore
<chr...@bn...>wrote:

> Please forgive the cross-post with libusb, but I was wondering if there
> was a specific pyUSB solution to my problem.
>
> Hey everyone,
>
> I'm encountering a problem with my script (it's Python) that causes my
> program to crash, probably mid-transfer between the program and the usb
> device (in my case this is a usb phone).
>
> When I try to re-launch my program, it gives me the following error:
>
> handle.getDescriptor(usb.DT_REPORT,0,0x9c,usb.ENDPOINT_OUT)
> usb.USBError: error sending control message: Timer expired
>
> Basically, when my program starts, it tries to find the device, via a for
> loop through the usb busses.  It verifies what it finds against a
> vendor/product ID and then tries to get a report descriptor from the
> device (as seen above).
>
> If I try to re-launch my program, I always get this error and the only way
> around this is to physically re-plug my device.
>
> I've tried to "re-claim" the interface and also do a "reset" on the
> device, but neither work.
>
> below is a snippet of the relevant code:
>
> --------------------
>
> def phone_INITIALIZE():
>        """this function initializes and takes control of the phone so we
> can
> communicate with it"""
>
>        global handle
>        global endpoint
>
>        # linksys CIT200 Device Info
>        vendor_id = 5041
>        product_id = 29
>
>        buses = usb.busses()
>
>        for bus in buses :
>          for device in bus.devices :
>            if device.idVendor == vendor_id :
>              if device.idProduct == product_id :
>                # found the CIT200
>                print "Found Linksys Device ..."
>                linksys = device
>
>        # open device
>        handle = linksys.open()
>
>        # setup interface and configs ... there are 4 interfaces for this
> device...
>        config = linksys.configurations[0]
>        interface = config.interfaces[3][0]
>        endpoint = interface.endpoints[0]
>
>        try:
>                # claim and set the interface
>                handle.claimInterface(interface)
>                handle.setAltInterface(interface)
>        except usb.USBError:
>                # detach the hid interface
>                handle.detachKernelDriver(3)
>
>        # get device descriptor
>        handle.getDescriptor(usb.DT_REPORT,0,0x9c,usb.ENDPOINT_OUT)
>
>        # send idle message
>        handle.controlMsg(0x21,0x0a,0,0,0x03)
>
> --------------------
>
> Any help would be appreciated.
>
> Thanks
>
> Christopher
>
>
>
> ------------------------------------------------------------------------------
> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada.
> The future of the web can't happen without you.  Join us at MIX09 to help
> pave the way to the Next Web now. Learn more and register at
>
> http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/
> _______________________________________________
> Pyusb-users mailing list
> Pyu...@li...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>