Error code -12 when opening Novint Falcon

[agirault]

I am working on making libusb1 the default USB communication library for LibNifalcon on Windows:
libnifalcon/libnifalcon#46. So far libftd2xx was used for Windows and libusb1 for Unix and Mac only.

I built against libusb-1.0.20.

I manage to get the device list with libusb_get_device_list, loop through it to find the Novint Falcon (vendorId = 1027, productId = 52040) using the libusb_get_device_descriptor, but libusb_open returns -12.

Here is what the libusb_device gives me in the debugger:

falconDevice    0x00000000003af720  libusb_device *
    lock    0x0000000000000124  void *
    refcnt  1   int
    ctx 0x000000000037ec70 {debug=0 debug_fixed=0 event_pipe=0x000000000037ec78 {0, 0} ...} libusb_context *
    bus_number  2 '\x2' unsigned char
    port_number 1 '\x1' unsigned char
    parent_dev  0x00000000003b5a80 {lock=0x0000000000000120 refcnt=3 ctx=0x000000000037ec70 {debug=0 debug_fixed=0 event_pipe=...} ...} libusb_device *
    device_address  3 '\x3' unsigned char
    num_configurations  1 '\x1' unsigned char
    speed   LIBUSB_SPEED_FULL (2)   libusb_speed
    list    {prev=0x00000000003b60d0 {prev=0x00000000003b6780 {prev=0x00000000003b6f40 {prev=0x000000000037ec80 {...} ...} ...} ...} ...}   list_head
    session_data    841 unsigned long
    device_descriptor   libusb_device_descriptor
        bLength 18 '\x12'   unsigned char
        bDescriptorType 1 '\x1' unsigned char
        bcdUSB  512 unsigned short
        bDeviceClass    0 '\0'  unsigned char
        bDeviceSubClass 0 '\0'  unsigned char
        bDeviceProtocol 0 '\0'  unsigned char
        bMaxPacketSize0 8 '\b'  unsigned char
        idVendor    1027    unsigned short
        idProduct   52040   unsigned short
        bcdDevice   1024    unsigned short
        iManufacturer   1 '\x1' unsigned char
        iProduct    2 '\x2' unsigned char
        iSerialNumber   3 '\x3' unsigned char
        bNumConfigurations  1 '\x1' unsigned char
    attached    1   int
    os_priv 0x00000000003af77c "\x1\x1\x1"  unsigned char[0]

Any idea?

Thank you.

[mcuee]

In order to use libusb under Windows, you have to use a supported driver -- WinUSB for example and not FTDI vendor driver.

[mcuee]

Closing this issue since this is not a libusb issue.