Hi Alex,
Yes, I have hidapi, but it does not include a HID report parser.
It's easy to use hidapi for a device like the funcube because you know
the format of the data that it sends. Making a HID interface work with
controllers you've never seen before is more difficult.
The HID report is an arbitrary structure which fits in maximum 64 bytes.
Your button presses and joystick values, etc., are at entirely arbitrary
locations in there. Where the switch bits that I am looking for are is
up to the implementor. To pick the bits out in a /generic /fashion
rather than a device-specific one, you have to parse the HID
descriptors. These are data structures the developer wrote into ROM
(meaning that the device doesn't understand them, it just sends them to
the driver). They tell the driver in a generic way what the data is and
where it is. Below is an example. The tutorial at
http://eleccelerator.com/tutorial-about-usb-hid-report-descriptors/
tells you how to parse it. There is also some difficult-to-wade-through
documentation at the USB organization site.
There doesn't seem to be a good portable parser for these. If I have to,
I'll write one and dual-license it.
Thanks
Bruce
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x04, // Usage (Joystick)
0xA1, 0x01, // Collection (Physical)
0xA1, 0x02, // Collection (Application)
0x85, 0x01, // Report ID (1)
0x75, 0x08, // Report Size (8)
0x95, 0x01, // Report Count (1)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x81, 0x03, // Input (Const,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position)
0x75, 0x01, // Report Size (1)
0x95, 0x13, // Report Count (19)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x35, 0x00, // Physical Minimum (0)
0x45, 0x01, // Physical Maximum (1)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (0x01)
0x29, 0x13, // Usage Maximum (0x13)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position)
0x75, 0x01, // Report Size (1)
0x95, 0x0D, // Report Count (13)
0x06, 0x00, 0xFF, // Usage Page (Vendor Defined 0xFF00)
0x81, 0x03, // Input (Const,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x01, // Usage (Pointer)
0xA1, 0x00, // Collection (Undefined)
0x75, 0x08, // Report Size (8)
0x95, 0x04, // Report Count (4)
0x35, 0x00, // Physical Minimum (0)
0x46, 0xFF, 0x00, // Physical Maximum (255)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x09, 0x32, // Usage (Z)
0x09, 0x35, // Usage (Rz)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position)
0xC0, // End Collection
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x75, 0x08, // Report Size (8)
0x95, 0x27, // Report Count (39)
0x09, 0x01, // Usage (Pointer)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position)
0x75, 0x08, // Report Size (8)
0x95, 0x30, // Report Count (48)
0x09, 0x01, // Usage (Pointer)
0x91, 0x02, // Output (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position,Non-volatile)
0x75, 0x08, // Report Size (8)
0x95, 0x30, // Report Count (48)
0x09, 0x01, // Usage (Pointer)
0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position,Non-volatile)
0xC0, // End Collection
0xA1, 0x02, // Collection (Application)
0x85, 0x02, // Report ID (2)
0x75, 0x08, // Report Size (8)
0x95, 0x30, // Report Count (48)
0x09, 0x01, // Usage (Pointer)
0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position,Non-volatile)
0xC0, // End Collection
0xA1, 0x02, // Collection (Application)
0x85, 0xEE, // Report ID (238)
0x75, 0x08, // Report Size (8)
0x95, 0x30, // Report Count (48)
0x09, 0x01, // Usage (Pointer)
0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position,Non-volatile)
0xC0, // End Collection
0xA1, 0x02, // Collection (Application)
0x85, 0xEF, // Report ID (239)
0x75, 0x08, // Report Size (8)
0x95, 0x30, // Report Count (48)
0x09, 0x01, // Usage (Pointer)
0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred
State,No Null Position,Non-volatile)
0xC0, // End Collection
0xC0, // End Collection
// 148 bytes
On 03/22/2014 02:28 AM, Alexandru Csete wrote:
Hi Bruce, I'm not sure this is what you are looking for but for the
Funcube Dongle driver we used the hidapi package to handle all HID
specific transactions
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