82066163-7050-ab49-b8cc-b3855e8d221f

Extension Unit for UVC_GUID_LOGITECH_USER_HW_CONTROL

Known selectors selectors: Bits 0 to 7 represent the LED mode. Currently, the following modes are available: - 0: Off. The LED is never illuminated, whether or not the device is streaming video. - 1: On. The LED is always illuminated, whether or not the device is streaming video. - 2: Blinking. The LED blinks, whether or not the device is streaming video. - 3: Auto. The LED is in control of the device. Typically this means that means that is is illuminated when streaming video and off when not streaming video.
 * 0 - XU_HW_CONTROL_LED1. Allows control over the state of the first LED.

Bits 16 to 23 represent the LED frequency. The frequency value only influences the 'Blinking' mode. It is expressed in units of 0.05 Hz and sets the blink frequency f. The blink interval T = 1/f is defined as the time between two adjoining rising edges (or two adjoining falling edges). The following table illustrates the relation between the LED frequency value used in bits 16 to 23, the physical blink frequency, and the physical blink interval. +---++--+ | Frequency value 20f [0.05 Hz] | Blink frequency f [Hz] | Blink interval T [s] | +---++--+ | 1                             | 0.05                   | 20                   |  | 2                             | 0.1                    | 10                   |  | 10                            | 0.5                    | 2                    |  | 20                            | 1                      | 1                    |  | 50                            | 2.5                    | 0.4                  |  | 100                           | 5                      | 0.2                  |  +---++--+