calculate_max_brightness_for_power_mW() [1/2]

uint8_t calculate_max_brightness_for_power_mW	(	const CRGB *	ledbuffer,
		uint16_t	numLeds,
		uint8_t	target_brightness,
		uint32_t	max_power_mW )

Determines the highest brightness level you can use and still stay under the specified power budget for a given set of LEDs.

Parameters

ledbuffer	the LED data to check
numLeds	the number of LEDs in the data array
target_brightness	the brightness you'd ideally like to use
max_power_mW	the max power draw desired, in milliwatts

Returns

a limited brightness value. No higher than the target brightness, but may be lower depending on the power limit.

Definition at line 95 of file power_mgt.cpp.

                                                                                                                                         {
    uint32_t total_mW = calculate_unscaled_power_mW( ledbuffer, numLeds);
 
    uint32_t requested_power_mW = ((uint32_t)total_mW * target_brightness) / 256;
 
    uint8_t recommended_brightness = target_brightness;
    if(requested_power_mW > max_power_mW) { 
        recommended_brightness = (uint32_t)((uint8_t)(target_brightness) * (uint32_t)(max_power_mW)) / ((uint32_t)(requested_power_mW));
    }
 
    return recommended_brightness;
}

References calculate_unscaled_power_mW().

Referenced by calculate_max_brightness_for_power_vmA(), and CFastLED::setMaxPowerInMilliWatts().

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