Exceptions about powermate HOT 5 OPEN

I'm not sure what that error is about, sorry. Both USB and PowerMate are pretty terrible. All I can say is that it was working with my knob and software config, so the writeInterrupt call should be correct:
https://github.com/EsotericSoftware/powermate/blob/master/src/powermate/PowerMate.java#L146

Are you sure you are using the libusb-win32 driver via Zadig? Described here:
https://github.com/EsotericSoftware/powermate#installation

I've since given up on the PowerMate knob, now I use a Zoom UAC-2, which is a nice looking DAC that has both a big system volume knob and a small headphones volume knob. I don't use the two instrument inputs.

from powermate.

Thanks for your response! I am indeed using the libusb-win32 driver (I wouldn't presume rotation control functions without it). I'm curious where you found the documentation for interfacing with the Powermate USB knob. The only reference I can find online is the open source (but unofficial) Linux drivers written in C.

from powermate.

It's been a while, I honestly can't remember. You might check here:
http://thammer.net/?p=374

To directly control the LED brightness, you can use the WriteReport method of the HidDevice class. Like this:

byte[] data = new byte[2];
data[0] = 0;
data[1] = (byte)brightness;
HidReport report = new HidReport(2, new HidDeviceData(data,    HidDeviceData.ReadStatus.Success));
device.WriteReport(report);

If that is similar to what I'm doing, you could try adding a 0:

dev.writeInterrupt(2, new byte[] {0, (byte)(0xff * brightness)}, 1, brightnessTimeout, false);

from powermate.

I figured out that there might be two versions of the PowerMate, the newer (version 2), is what I have. I managed to scoop up some documentation online, and got the following code to work:

public void setBrightness (int brightness) {
		if (dev == null) return;
		if (brightness < 0 || brightness > 255) {
			throw new IllegalArgumentException("Illegal brightness: " + brightness);
		}

		try {
			dev.controlMsg(
					// Request type
					USB.REQ_TYPE_DIR_HOST_TO_DEVICE
					| USB.REQ_TYPE_RECIP_INTERFACE 
					| USB.REQ_TYPE_TYPE_VENDOR,

					// Request
					0x01,

					// Value = command type
					0x0001,

					// Index = brightness
					brightness,
					
					// Data (dummy buffer)
					new byte[0],

					// Length
					0,

					// Timeout (ms)
					BRIGHTNESS_TIMEOUT,

					// Reopen on timeout
					true);
		} catch (USBTimeoutException ex) {
			return;
		} catch (USBException ex) {
			// TODO: This seems to always throw, disable for now
			//LOGGER.log(Level.SEVERE, "Error setting brightness", ex);
		}

		this.brightness = brightness;

This still throws exceptions (as can be seen above), but the brightness is set correctly.

I still have one more question before closing this. What do you use to build this project into an executable? I have installed ResourceHacker and JSmooth already. I think I just need to build the project.yaml file now.

Thanks for your help!

from powermate.

Good find! If you want to make a PR so it works with both PowerMate versions, I'd merge it.

I build it using Scar:
https://github.com/EsotericSoftware/scar
It's a trivial build though and could be done with Gradle or whatever.

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