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+/**
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+ * Marlin 3D Printer Firmware
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+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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+ *
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+ * Based on Sprinter and grbl.
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+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+#include "../inc/MarlinConfig.h"
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+
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+#if ENABLED(USE_CONTROLLER_FAN)
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+
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+void controllerfan_update() {
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+ static millis_t lastMotorOn = 0, // Last time a motor was turned on
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+ nextMotorCheck = 0; // Last time the state was checked
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+ const millis_t ms = millis();
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+ if (ELAPSED(ms, nextMotorCheck)) {
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+ nextMotorCheck = ms + 2500UL; // Not a time critical function, so only check every 2.5s
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+ if (X_ENABLE_READ == X_ENABLE_ON || Y_ENABLE_READ == Y_ENABLE_ON || Z_ENABLE_READ == Z_ENABLE_ON || thermalManager.soft_pwm_amount_bed > 0
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+ || E0_ENABLE_READ == E_ENABLE_ON // If any of the drivers are enabled...
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+ #if E_STEPPERS > 1
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+ || E1_ENABLE_READ == E_ENABLE_ON
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+ #if HAS_X2_ENABLE
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+ || X2_ENABLE_READ == X_ENABLE_ON
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+ #endif
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+ #if E_STEPPERS > 2
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+ || E2_ENABLE_READ == E_ENABLE_ON
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+ #if E_STEPPERS > 3
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+ || E3_ENABLE_READ == E_ENABLE_ON
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+ #if E_STEPPERS > 4
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+ || E4_ENABLE_READ == E_ENABLE_ON
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+ #endif // E_STEPPERS > 4
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+ #endif // E_STEPPERS > 3
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+ #endif // E_STEPPERS > 2
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+ #endif // E_STEPPERS > 1
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+ ) {
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+ lastMotorOn = ms; //... set time to NOW so the fan will turn on
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+ }
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+
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+ // Fan off if no steppers have been enabled for CONTROLLERFAN_SECS seconds
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+ uint8_t speed = (!lastMotorOn || ELAPSED(ms, lastMotorOn + (CONTROLLERFAN_SECS) * 1000UL)) ? 0 : CONTROLLERFAN_SPEED;
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+
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+ // allows digital or PWM fan output to be used (see M42 handling)
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+ WRITE(CONTROLLER_FAN_PIN, speed);
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+ analogWrite(CONTROLLER_FAN_PIN, speed);
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+ }
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+}
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+
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+#endif // USE_CONTROLLER_FAN
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