Anyone try using the puck as a USB HID Joystick?

Awesome tips -thx! Responses:

Is OpenEmu running on the same Mac you're developing with?

yup!

Maybe try NRF.sendHIDReport([buttons, x, y], () => { inside a try { ... } catch...

Done

I'd remove the print statements.

Ahh - didn't realize that could cause issues. Removed.

You could add a little LED flash in your code so you can see if update is still executing correctly

Done - great suggestion. I have it flashing blue when it starts the sendHID function, red when NRF.sendHIDReport() is successful, and green when it's sending a button press.

With those changes it does expose something weird. When I connect via the IDE, I can flash the device and see both the red and blue LEDs blinking. When I disconnect from the IDE and only connect via the mac bluetooth menu, I only ever see the blue led blinking. So NRF.sendHIDReport() never seems to be successful, unless I connect via the IDE...

Does that add up to anything obviously incorrect?

//https://github.com/espruino/BangleApps/blob/master/apps/boot/hid_info.txt
var joystick_report = new Uint8Array([
  0x05, 0x01,       // Usage Page (Generic Desktop)
  0x09, 0x04,       // Usage (Joystick)
  0xA1, 0x01,       // Collection (Application)
	0x09, 0x01,       // Usage (Pointer)
	0xA1, 0x00,       // Collection (Physical)
  // Buttons
  0x05, 0x09,       // Usage Page (Buttons)
  0x19, 0x01,       // Usage Minimum (1)
  0x29, 0x05,       // Usage Maximum (5)
  0x15, 0x00,       // Logical Minimum (0)
  0x25, 0x01,       // Logical Maximum (1)
  0x95, 0x05,       // Report Count (5)
  0x75, 0x01,       // Report Size (1)
  0x81, 0x02,       // Input (Data, Variable, Absolute)

  // padding bits
  0x95, 0x03,       // Report Count (3)
  0x75, 0x01,       // Report Size (1)
  0x81, 0x03,       // Input (Constant)

  // Stick
  0x05, 0x01,       // Usage Page (Generic Desktop)
  0x09, 0x30,       // Usage (X)
  0x09, 0x31,       // Usage (Y)
  0x15, 0x81,       // Logical Minimum (-127)
  0x25, 0x7f,       // Logical Maximum (127)
  0x75, 0x08,       // Report Size (8)
  0x95, 0x02,       // Report Count (2)
  0x81, 0x02,       // Input (Data, Variable, Absolute)
	0xC0,              // End Collection (Physical)
  0xC0              // End Collection (Application)
]);

NRF.setServices(undefined, { hid : joystick_report });

Puck.accelOn(); // default is 12.5Hz, with gyro

var sendInProgress = false; // Only send one message at a time, do not flood
const sendHid = function (x, y, btn1, btn2, btn3, btn4, btn5, cb) {
  try {
    const buttons = (btn5<<4) | (btn4<<3) | (btn3<<2) | (btn2<<1) | (btn1<<0);
    if (!sendInProgress) {
      sendInProgress = true;
      try {
        NRF.sendHIDReport([buttons, x, y], () => 
        {
          sendInProgress = false;
          //print ([buttons, x, y]);
          digitalPulse(LED1,1,1);
          if (buttons == 1) {
            digitalPulse(LED2,1,1);
          }
        }
        );
      } catch(e) {
        print(e);
      }
    }
  } catch(e) {
    print(e);
  }
};

function update() {
  const btn1 = BTN1.read();
  const accel = Puck.accel();
  var x = accel.acc.x/128000;
  var y = accel.acc.y/128000;
  
  // rescale to approximately [-127:127]
  x *= 10;
  y *= 10;
  // I assume the joystick requires ints
  x = Math.floor( x * 127 );
  y = Math.floor( y * 127); 
  
  // check limits
  if (x > 127) x = 127;
  else if (x < -127) x = -127;
  if (y > 127) y = 127;
  else if (y < -127) y = -127;
  
  sendHid(x & 0xff, y & 0xff, btn1, false, false, false, false);
  //print ("x", x, "y", y, "btn1", btn1);
}

setInterval(update, 100); // 10 Hz