Function veml6030::calculate_raw_threshold_value

pub fn calculate_raw_threshold_value(
    it: IntegrationTime, 
    gain: Gain, 
    lux: f32
) -> u16

Calculate raw value for threshold applying compensation if necessary.

For values higher than 1000 lx and 1/4 or 1/8 gain, the inverse of the compensation formula is applied. This involves quite some math so it may be interesting to calculate the threshold values ahead of time.