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Robert Durkacz robert.durkacz at gmail.comIt looks like this answers my question. The libusb documentation at http://www.libusb.org/wiki/windows_backend also points to Zadig as the way to control what driver is used. Thanks. On Thu, Jan 17, 2013 at 3:12 PM, Moses <moses.mason at gmail.com> wrote: > I'm using Zadig (http://sourceforge.net/projects/libwdi/files/zadig/) > to replace the driver comes with the device with the WinUSB driver, > which is very easy to use and works fine for me. At the end of my > replacing, it maybe pop a error message box indicates the replacing is > failed, but in fact, after checking the hardware manager, the driver > is installed correctly and works very well. > > > On Sat, Jan 12, 2013 at 12:03 PM, Robert Durkacz > <robert.durkacz at gmail.com> wrote: >> Hello, >> >> I am using cygwin with Windows XP but I do not have a good >> understanding of the Windows OS. I could do with some advice about how >> the usb driver for the RTL2832U device is meant to be located by the >> rtl_sdr.c program using the libusb library. >> >> For me this program fails with a libusb_open() error of -12. Using the >> debugger I can see this is due to no driver being found for the >> RTL2832U device. >> >> When the function get_api_type() in windows_usb.c is called it >> consults the registry for a driver name for the device. In my case it >> finds RTL2832UUSB and RTL2832UBDA but I suppose this just depends on >> what is sitting in the registry. Subsequently the program checks to >> see if the driver name is WINUSB or USBCCGP. Because it is not the >> program cannot work. >> >> Am I meant to ensure either WINUSB or USBGCCP drivers are installed on >> my computer and must the registry entry for the RTL2832U device point >> to one of these? If so, is there a recommended procedure to do that? >> >> Thanks for any advice >> Robert Durkacz >> > > > > -- > "I may not agree with what you say but I will defend to the death your > right to say it"