text: /**
   * 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 HAS_USER_THERMISTORS
  
  #include "../gcode.h"
  #include "../../module/temperature.h"
  
  /**
   * M305: Set (or report) custom thermistor parameters
   *
   *   P[index]  Thermistor table index
   *   R[ohms]   Pullup resistor value
   *   T[ohms]   Resistance at 25C
   *   B[beta]   Thermistor "beta" value
   *   C[coeff]  Steinhart-Hart Coefficient 'C'
   *
   *   Format: M305 P[tbl_index] R[pullup_resistor_val] T[therm_25C_resistance] B[therm_beta] C[Steinhart_Hart_C_coeff]
   *
   * Examples: M305 P0 R4700 T100000 B3950 C0.0
   *           M305 P0 R4700
   *           M305 P0 T100000
   *           M305 P0 B3950
   *           M305 P0 C0.0
   */
  void GcodeSuite::M305() {
    const int8_t t_index = parser.intval('P', -1);
    const bool do_set = parser.seen("BCRT");
  
    // A valid P index is required
    if (t_index >= (USER_THERMISTORS) || (do_set && t_index < 0)) {
      SERIAL_ECHO_START();
      SERIAL_ECHOLNPAIR("!Invalid index. (0 <= P <= ", int(USER_THERMISTORS - 1), ")");
    }
    else if (do_set) {
      if (parser.seen('R')) // Pullup resistor value
        if (!thermalManager.set_pull_up_res(t_index, parser.value_float()))
          SERIAL_ECHO_MSG("!Invalid series resistance. (0 < R < 1000000)");
  
      if (parser.seen('T')) // Resistance at 25C
        if (!thermalManager.set_res25(t_index, parser.value_float()))
          SERIAL_ECHO_MSG("!Invalid 25C resistance. (0 < T < 10000000)");
  
      if (parser.seen('B')) // Beta value
        if (!thermalManager.set_beta(t_index, parser.value_float()))
          SERIAL_ECHO_MSG("!Invalid beta. (0 < B < 1000000)");
  
      if (parser.seen('C')) // Steinhart-Hart C coefficient
        if (!thermalManager.set_sh_coeff(t_index, parser.value_float()))
          SERIAL_ECHO_MSG("!Invalid Steinhart-Hart C coeff. (-0.01 < C < +0.01)");
    }                       // If not setting then report parameters
    else if (t_index < 0) { // ...all user thermistors
      LOOP_L_N(i, USER_THERMISTORS)
        thermalManager.log_user_thermistor(i);
    }
    else                    // ...one user thermistor
      thermalManager.log_user_thermistor(t_index);
  }
  
  #endif // HAS_USER_THERMISTORS
  