Marlin_Firmware/Marlin/src/feature/controllerfan.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "../inc/MarlinConfig.h"

#if ENABLED(USE_CONTROLLER_FAN)

#include "../module/stepper/indirection.h"
#include "../module/temperature.h"

uint8_t controllerfan_speed;

void controllerfan_update() {
  static millis_t lastMotorOn = 0, // Last time a motor was turned on
                  nextMotorCheck = 0; // Last time the state was checked
  const millis_t ms = millis();
  if (ELAPSED(ms, nextMotorCheck)) {
    nextMotorCheck = ms + 2500UL; // Not a time critical function, so only check every 2.5s

    const bool xory = X_ENABLE_READ() == bool(X_ENABLE_ON) || Y_ENABLE_READ() == bool(Y_ENABLE_ON);

    // If any of the drivers or the bed are enabled...
    if (xory || Z_ENABLE_READ() == bool(Z_ENABLE_ON)
      #if HAS_HEATED_BED
        || thermalManager.temp_bed.soft_pwm_amount > 0
      #endif
      #if HAS_X2_ENABLE
        || X2_ENABLE_READ() == bool(X_ENABLE_ON)
      #endif
      #if HAS_Y2_ENABLE
        || Y2_ENABLE_READ() == bool(Y_ENABLE_ON)
      #endif
      #if HAS_Z2_ENABLE
        || Z2_ENABLE_READ() == bool(Z_ENABLE_ON)
      #endif
      #if HAS_Z3_ENABLE
        || Z3_ENABLE_READ() == bool(Z_ENABLE_ON)
      #endif
      #if HAS_Z4_ENABLE
        || Z4_ENABLE_READ() == bool(Z_ENABLE_ON)
      #endif
      #if E_STEPPERS
        #define _OR_ENABLED_E(N) || E##N##_ENABLE_READ() == bool(E_ENABLE_ON)
        REPEAT(E_STEPPERS, _OR_ENABLED_E)
      #endif
    ) {
      lastMotorOn = ms; //... set time to NOW so the fan will turn on
    }

    // Fan off if no steppers have been enabled for CONTROLLERFAN_SECS seconds
    controllerfan_speed = (!lastMotorOn || ELAPSED(ms, lastMotorOn + (CONTROLLERFAN_SECS) * 1000UL)) ? 0 : (
      #ifdef CONTROLLERFAN_SPEED_Z_ONLY
        xory ? CONTROLLERFAN_SPEED : CONTROLLERFAN_SPEED_Z_ONLY
      #else
        CONTROLLERFAN_SPEED
      #endif
    );

    // Allow digital or PWM fan output (see M42 handling)
    WRITE(CONTROLLER_FAN_PIN, controllerfan_speed);
    analogWrite(pin_t(CONTROLLER_FAN_PIN), controllerfan_speed);
  }
}

#endif // USE_CONTROLLER_FAN