C++ (Cpp) CLEDController::leds示例

示例#1

文件： power_mgt.cpp 项目： 0x15e/FastLED

// sets brightness to
//  - no more than target_brightness
//  - no more than max_mW milliwatts
uint8_t calculate_max_brightness_for_power_mW( uint8_t target_brightness, uint32_t max_power_mW)
{
    uint32_t total_mW = gMCU_mW;

    CLEDController *pCur = CLEDController::head();
	while(pCur) {
        total_mW += calculate_unscaled_power_mW( pCur->leds(), pCur->size());
		pCur = pCur->next();
	}

#if POWER_DEBUG_PRINT == 1
    Serial.print("power demand at full brightness mW = ");
    Serial.println( total_mW);
#endif

    uint32_t requested_power_mW = ((uint32_t)total_mW * target_brightness) / 256;
#if POWER_DEBUG_PRINT == 1
    if( target_brightness != 255 ) {
        Serial.print("power demand at scaled brightness mW = ");
        Serial.println( requested_power_mW);
    }
    Serial.print("power limit mW = ");
    Serial.println( max_power_mW);
#endif

    if( requested_power_mW < max_power_mW) {
#if POWER_LED > 0
        if( gMaxPowerIndicatorLEDPinNumber ) {
            digitalWrite(gMaxPowerIndicatorLEDPinNumber, LOW);   // turn the LED off
        }
#endif
#if POWER_DEBUG_PRINT == 1
        Serial.print("demand is under the limit");
#endif
        return target_brightness;
    }

    uint8_t recommended_brightness = (uint32_t)((uint8_t)(target_brightness) * (uint32_t)(max_power_mW)) / ((uint32_t)(requested_power_mW));
#if POWER_DEBUG_PRINT == 1
    Serial.print("recommended brightness # = ");
    Serial.println( recommended_brightness);

    uint32_t resultant_power_mW = (total_mW * recommended_brightness) / 256;
    Serial.print("resultant power demand mW = ");
    Serial.println( resultant_power_mW);

    Serial.println();
#endif

#if POWER_LED > 0
    if( gMaxPowerIndicatorLEDPinNumber ) {
        digitalWrite( gMaxPowerIndicatorLEDPinNumber, HIGH);   // turn the LED on
    }
#endif

    return recommended_brightness;
}