text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2017 Nick Moore
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  
  #include <stdio.h>
  
  #include "py/runtime.h"
  #include "py/mphal.h"
  #include "modmachine.h"
  
  #if MICROPY_PY_MACHINE_DAC
  
  #include "driver/gpio.h"
  #include "driver/dac.h"
  
  typedef struct _mdac_obj_t {
      mp_obj_base_t base;
      gpio_num_t gpio_id;
      dac_channel_t dac_id;
  } mdac_obj_t;
  
  STATIC const mdac_obj_t mdac_obj[] = {
      #if CONFIG_IDF_TARGET_ESP32
      {{&machine_dac_type}, GPIO_NUM_25, DAC_CHANNEL_1},
      {{&machine_dac_type}, GPIO_NUM_26, DAC_CHANNEL_2},
      #else
      {{&machine_dac_type}, GPIO_NUM_17, DAC_CHANNEL_1},
      {{&machine_dac_type}, GPIO_NUM_18, DAC_CHANNEL_2},
      #endif
  };
  
  STATIC mp_obj_t mdac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw,
      const mp_obj_t *args) {
  
      mp_arg_check_num(n_args, n_kw, 1, 1, true);
      gpio_num_t pin_id = machine_pin_get_id(args[0]);
      const mdac_obj_t *self = NULL;
      for (int i = 0; i < MP_ARRAY_SIZE(mdac_obj); i++) {
          if (pin_id == mdac_obj[i].gpio_id) {
              self = &mdac_obj[i];
              break;
          }
      }
      if (!self) {
          mp_raise_ValueError(MP_ERROR_TEXT("invalid Pin for DAC"));
      }
  
      esp_err_t err = dac_output_enable(self->dac_id);
      if (err == ESP_OK) {
          err = dac_output_voltage(self->dac_id, 0);
      }
      if (err == ESP_OK) {
          return MP_OBJ_FROM_PTR(self);
      }
      mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
  }
  
  STATIC void mdac_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
      mdac_obj_t *self = self_in;
      mp_printf(print, "DAC(Pin(%u))", self->gpio_id);
  }
  
  STATIC mp_obj_t mdac_write(mp_obj_t self_in, mp_obj_t value_in) {
      mdac_obj_t *self = self_in;
      int value = mp_obj_get_int(value_in);
      if (value < 0 || value > 255) {
          mp_raise_ValueError(MP_ERROR_TEXT("value out of range"));
      }
  
      esp_err_t err = dac_output_voltage(self->dac_id, value);
      if (err == ESP_OK) {
          return mp_const_none;
      }
      mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
  }
  MP_DEFINE_CONST_FUN_OBJ_2(mdac_write_obj, mdac_write);
  
  STATIC const mp_rom_map_elem_t mdac_locals_dict_table[] = {
      { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mdac_write_obj) },
  };
  
  STATIC MP_DEFINE_CONST_DICT(mdac_locals_dict, mdac_locals_dict_table);
  
  const mp_obj_type_t machine_dac_type = {
      { &mp_type_type },
      .name = MP_QSTR_DAC,
      .print = mdac_print,
      .make_new = mdac_make_new,
      .locals_dict = (mp_obj_t)&mdac_locals_dict,
  };
  
  #endif // MICROPY_PY_MACHINE_DAC
  