marlin/Marlin/src/feature/dac/stepper_dac.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 <https://www.gnu.org/licenses/>.
 *
 */

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

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

#if HAS_MOTOR_CURRENT_DAC

#include "stepper_dac.h"

bool dac_present = false;
constexpr xyze_uint8_t dac_order = DAC_STEPPER_ORDER;
xyze_uint_t dac_channel_pct = DAC_MOTOR_CURRENT_DEFAULT;

StepperDAC stepper_dac;

int StepperDAC::init() {
  #if PIN_EXISTS(DAC_DISABLE)
    OUT_WRITE(DAC_DISABLE_PIN, LOW);  // set pin low to enable DAC
  #endif

  mcp4728.init();

  if (mcp4728.simpleCommand(RESET)) return -1;

  dac_present = true;

  mcp4728.setVref_all(DAC_STEPPER_VREF);
  mcp4728.setGain_all(DAC_STEPPER_GAIN);

  if (mcp4728.getDrvPct(0) < 1 || mcp4728.getDrvPct(1) < 1 || mcp4728.getDrvPct(2) < 1 || mcp4728.getDrvPct(3) < 1) {
    mcp4728.setDrvPct(dac_channel_pct);
    mcp4728.eepromWrite();
  }

  return 0;
}

void StepperDAC::set_current_value(const uint8_t channel, uint16_t val) {
  if (!(dac_present && channel < LOGICAL_AXES)) return;

  NOMORE(val, uint16_t(DAC_STEPPER_MAX));

  mcp4728.analogWrite(dac_order[channel], val);
  mcp4728.simpleCommand(UPDATE);
}

void StepperDAC::set_current_percent(const uint8_t channel, float val) {
  set_current_value(channel, _MIN(val, 100.0f) * (DAC_STEPPER_MAX) / 100.0f);
}

static float dac_perc(int8_t n) { return mcp4728.getDrvPct(dac_order[n]); }
static float dac_amps(int8_t n) { return mcp4728.getValue(dac_order[n]) * 0.125 * RECIPROCAL(DAC_STEPPER_SENSE * 1000); }

uint8_t StepperDAC::get_current_percent(const AxisEnum axis) { return mcp4728.getDrvPct(dac_order[axis]); }
void StepperDAC::set_current_percents(xyze_uint8_t &pct) {
  LOOP_LOGICAL_AXES(i) dac_channel_pct[i] = pct[dac_order[i]];
  mcp4728.setDrvPct(dac_channel_pct);
}

void StepperDAC::print_values() {
  if (!dac_present) return;
  SERIAL_ECHO_MSG("Stepper current values in % (Amps):");
  SERIAL_ECHO_START();
  LOOP_LOGICAL_AXES(a) {
    SERIAL_CHAR(' ', IAXIS_CHAR(a), ':');
    SERIAL_ECHO(dac_perc(a));
    SERIAL_ECHOPGM_P(PSTR(" ("), dac_amps(AxisEnum(a)), PSTR(")"));
  }
  #if HAS_EXTRUDERS
    SERIAL_ECHOLNPGM_P(SP_E_LBL, dac_perc(E_AXIS), PSTR(" ("), dac_amps(E_AXIS), PSTR(")"));
  #endif
}

void StepperDAC::commit_eeprom() {
  if (!dac_present) return;
  mcp4728.eepromWrite();
}

#endif // HAS_MOTOR_CURRENT_DAC