Get focal length (a.k.a. zoom) info via BLE?

Hi,

is there a chance to get the focal length of a (non motorized) zoom lens via BLE?

I checked the source code of BlueMagic32, but I think that this will always return 0.00.
https://github.com/schoolpost/BlueMagic ... roller.cpp

Code: Select all

void BlueMagicCameraController::zoom(float zoom)
{
  if (zoom < 0 && zoom > 1)
    return;

  uint16_t val = mapFloat(zoom);

  uint8_t xlow = val & 0xff;
  uint8_t xhigh = (val >> 8);

  uint8_t data[10] = {255, 6, 0, 0, 0, 8, 128, 0, xlow, xhigh};
  _cameraControl->writeValue(data, 10, true);
}

float BlueMagicCameraController::getZoom()
{
  return 0.0;
}

The BMD manual talks at least about setting the focal length:
https://documents.blackmagicdesign.com/ ... 0005210000

BMD_BLE_Zoom.png (127.21 KiB) Viewed 2135 times

Anyone able and willing to help?

Thank you in advance!
Chris

You get zoom value by listening to the BLE notifications. Works for me(tm)