marlin/Marlin/stepper_dac.cpp

/*
  stepper_dac.cpp - To set stepper current via DAC

  Part of Marlin

  Copyright (c) 2016 MarlinFirmware

  Marlin 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.

  Marlin 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 Marlin.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "Marlin.h"

#if ENABLED(DAC_STEPPER_CURRENT)

  #include "stepper_dac.h"

  bool dac_present = false;
  const uint8_t dac_order[NUM_AXIS] = DAC_STEPPER_ORDER;

  int dac_init() {
    mcp4728_init();

    if (mcp4728_simpleCommand(RESET)) return -1;

    dac_present = true;

    mcp4728_setVref_all(DAC_STEPPER_VREF);
    mcp4728_setGain_all(DAC_STEPPER_GAIN);

    return 0;
  }

  void dac_current_percent(uint8_t channel, float val) {
    if (!dac_present) return;

    NOMORE(val, 100);

    mcp4728_analogWrite(dac_order[channel], val * DAC_STEPPER_MAX / 100);
    mcp4728_simpleCommand(UPDATE);
  }

  void dac_current_raw(uint8_t channel, uint16_t val) {
    if (!dac_present) return;

    NOMORE(val, DAC_STEPPER_MAX);

    mcp4728_analogWrite(dac_order[channel], val);
    mcp4728_simpleCommand(UPDATE);
  }

  static float dac_perc(int8_t n) { return 100.0 * mcp4728_getValue(dac_order[n]) / DAC_STEPPER_MAX; }
  static float dac_amps(int8_t n) { return ((2.048 * mcp4728_getValue(dac_order[n])) / 4096.0) / (8.0 * DAC_STEPPER_SENSE); }

  void dac_print_values() {
    if (!dac_present) return;

    SERIAL_ECHO_START;
    SERIAL_ECHOLNPGM("Stepper current values in % (Amps):");
    SERIAL_ECHO_START;
    SERIAL_ECHOPAIR(" X:",  dac_perc(0));
    SERIAL_ECHOPAIR(" (",   dac_amps(0));
    SERIAL_ECHOPAIR(") Y:", dac_perc(1));
    SERIAL_ECHOPAIR(" (",   dac_amps(1));
    SERIAL_ECHOPAIR(") Z:", dac_perc(2));
    SERIAL_ECHOPAIR(" (",   dac_amps(2));
    SERIAL_ECHOPAIR(") E:", dac_perc(3));
    SERIAL_ECHOPAIR(" (",   dac_amps(3));
    SERIAL_ECHOLN(")");
  }

  void dac_commit_eeprom() {
    if (!dac_present) return;
    mcp4728_eepromWrite();
  }

#endif // DAC_STEPPER_CURRENT