marlin/Marlin/src/feature/spindle_laser.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2019 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/>.
 *
 */

/**
 * feature/spindle_laser.cpp
 */

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

#if HAS_CUTTER

#include "spindle_laser.h"

SpindleLaser cutter;

cutter_power_t SpindleLaser::power; // = 0

void SpindleLaser::init() {
  OUT_WRITE(SPINDLE_LASER_ENA_PIN, !SPINDLE_LASER_ACTIVE_HIGH); // Init spindle to off
  #if ENABLED(SPINDLE_CHANGE_DIR)
    OUT_WRITE(SPINDLE_DIR_PIN, SPINDLE_INVERT_DIR ? 255 : 0);   // Init rotation to clockwise (M3)
  #endif
  #if ENABLED(SPINDLE_LASER_PWM) && PIN_EXISTS(SPINDLE_LASER_PWM)
    SET_PWM(SPINDLE_LASER_PWM_PIN);
    analogWrite(SPINDLE_LASER_PWM_PIN, SPINDLE_LASER_PWM_INVERT ? 255 : 0);  // set to lowest speed
  #endif
}

#if ENABLED(SPINDLE_LASER_PWM)

  /**
   * ocr_val_mode() is used for debugging and to get the points needed to compute the RPM vs ocr_val line
   *
   * it accepts inputs of 0-255
   */
  void SpindleLaser::set_ocr(const uint8_t ocr) {
    WRITE(SPINDLE_LASER_ENA_PIN, SPINDLE_LASER_ACTIVE_HIGH); // turn spindle on (active low)
    #if ENABLED(SPINDLE_LASER_PWM)
      analogWrite(SPINDLE_LASER_PWM_PIN, (SPINDLE_LASER_PWM_INVERT) ? 255 - ocr : ocr);
    #endif
  }

#endif

void SpindleLaser::update_output() {
  const bool ena = enabled();
  #if ENABLED(SPINDLE_LASER_PWM)
    if (ena) {
      constexpr float inv_slope = RECIPROCAL(SPEED_POWER_SLOPE),
                      min_ocr = (SPEED_POWER_MIN - (SPEED_POWER_INTERCEPT)) * inv_slope,  // Minimum allowed
                      max_ocr = (SPEED_POWER_MAX - (SPEED_POWER_INTERCEPT)) * inv_slope;  // Maximum allowed
      int16_t ocr_val;
           if (power <= SPEED_POWER_MIN) ocr_val = min_ocr;                               // Use minimum if set below
      else if (power >= SPEED_POWER_MAX) ocr_val = max_ocr;                               // Use maximum if set above
      else ocr_val = (power - (SPEED_POWER_INTERCEPT)) * inv_slope;                       // Use calculated OCR value
      set_ocr(ocr_val & 0xFF);                                                            // ...limited to Atmel PWM max
    }
    else {                                                                                // Convert RPM to PWM duty cycle
      WRITE(SPINDLE_LASER_ENA_PIN, !SPINDLE_LASER_ACTIVE_HIGH);                         // Turn spindle off (active low)
      analogWrite(SPINDLE_LASER_PWM_PIN, SPINDLE_LASER_PWM_INVERT ? 255 : 0);             // Only write low byte
    }
  #else
    WRITE(SPINDLE_LASER_ENA_PIN, ena ? SPINDLE_LASER_ACTIVE_HIGH : !SPINDLE_LASER_ACTIVE_HIGH);
  #endif
  power_delay(ena);
}

#if ENABLED(SPINDLE_CHANGE_DIR)

  void SpindleLaser::set_direction(const bool reverse) {
    const bool dir_state = (reverse == SPINDLE_INVERT_DIR); // Forward (M3) HIGH when not inverted
    #if ENABLED(SPINDLE_STOP_ON_DIR_CHANGE)
      if (enabled() && READ(SPINDLE_DIR_PIN) != dir_state) disable();
    #endif
    WRITE(SPINDLE_DIR_PIN, dir_state);
  }

#endif

#endif // HAS_CUTTER