[chuck-users] best way to read from HID device

Spencer Salazar ssalazar at CS.Princeton.EDU
Tue Jan 20 14:38:30 EST 2009

To limit the complexity of the internal implementation and external  
usage, ChucK HID only functions with devices that claim to be a  
joystick, keyboard, or mouse.  It appears that this device does not  
claim to be any of those device types.  But for future development, I  
like the idea of providing a complementary, more generic HID interface  
that would function with any USB HID.


On Jan 12, 2009, at 3:47 AM, Kassen wrote:

> Steve;
> > I don't know if anyone else has the same device as you, if it's DIY
> > you might try some generic HID program on Linux to at least make  
> sure
> > it reads as a normal joystick.
> That device is a commercial one, I looked at it (online) some time  
> back. It's a bit of a shame that products like that don't document  
> in what way they implement the standard. I've been eyeing several  
> products, mostly integrated DJ solutions with jog-dials, and they  
> tend to advertise that they come with software and that everything  
> will work magically when you plug it in. I'm sure this brings a lot  
> of joy to many people but it doesn't help us much in figuring out  
> whether it will work with ChucK which only supports keyboard, mouse  
> and joysticks.
> It would be nice to have a more general implementation for devices  
> like this and tablets, etc but I'm not sure how hard that would be.  
> I don't think ChucK reads USB/HID directly, I think it instead  
> depends on the OS to negotiate with the device about it's nature and  
> functionality but I'm not 100% sure of that, we'll have to ask  
> resident "hid-man" Spencer. This may also depend on the OS; I gather  
> the various OS's deal with this standard in rather different ways,  
> it's really quite convenient how all of that is abstracted away for  
> ChucKist use (except of course when we want something unusual). If  
> it's not a "normal joystick" then I'm quite sure we won't be able to  
> read it right now and the reverse holds true as well; I tried quite  
> a few devices and I've never seen anything that was considered a  
> joystick yet couldn't be read. I don't think there is anything that  
> prevents this device from claiming it's a "HID drumpad", to quote  
> from WikiPedia;
> Other devices
> The USB HID class specifications allow for myriad other devices  
> under the USB HID class. Some examples are automobile simulation  
> controllers, exercise machines, telephony devices, audio controls,  
> medical instrumentation, and even magic carpet simulators. Even  
> uninterruptible power supplies declare themselves under this class,  
> despite the fact they have no human interface at all. Any device can  
> be a USB HID class device as long as a designer meets the USB HID  
> class logical specifications. This is not to say that there is no  
> need to ship drivers for these devices, nor that an operating system  
> will immediately recognize the device. This only means that the  
> device can declare itself under the human interface device class.
> Yours,
> Kas. _______________________________________________
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