Hello,
I have spent hours now trying to get communication working with a custom
USB device on Windows using libusbx. I have communication working through a
virtual com port so I believe the device is functioning as expected.
My device reports that it has 3 interfaces (0, 1, 2) and a total of 5 open
pipes (see below for the complete output). However my calls to
libusb_claim_interface return -12 for all interfaces except 2 which is
HID. I am able to get two way communication over HID, but the USB device
i'm using only supports minimal functionality over HID (or atleast thats my
understanding). I'm not sure if this is due to some driver configuration,
bugs in my code, bugs in windows backend etc. My code is as follows:
r = libusb_init(&ctx);//Success
libusb_set_debug(ctx, 3);
dev_handle = libusb_open_device_with_vid_pid(ctx, 0x04D8, 0x00DF);//Success
r = libusb_claim_interface(dev_handle, interface_number);//Returns -12 for
interfaces 0 and 1,
usbview output:
Interface Descriptor:
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x01
bInterfaceClass: 0x02
bInterfaceSubClass: 0x02
bInterfaceProtocol: 0x01
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x82 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0008 (8)
bInterval: 0x02
Interface Descriptor:
bInterfaceNumber: 0x01
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0x0A
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x03 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0020 (32)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x83 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0040 (64)
bInterval: 0x00
Interface Descriptor:
bInterfaceNumber: 0x02
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0x03 (HID)
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x00
HID Descriptor:
bcdHID: 0x0111
bCountryCode: 0x00
bNumDescriptors: 0x01
bDescriptorType: 0x22
wDescriptorLength: 0x001D
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0010 (16)
bInterval: 0x01
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Interrupt
wMaxPacketSize: 0x0010 (16)
bInterval: 0x01
------------------------------------------------------------------------------
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