text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2017 Nick Moore
   * Copyright (c) 2018 LoBo (https://github.com/loboris)
   *
   * 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 "esp_log.h"
  
  #include "driver/gpio.h"
  #include "driver/touch_pad.h"
  
  #include "py/runtime.h"
  #include "py/mphal.h"
  #include "modmachine.h"
  #include "modmachine.h"
  
  
  typedef struct _mtp_obj_t {
      mp_obj_base_t base;
      gpio_num_t gpio_id;
      touch_pad_t touchpad_id;
  } mtp_obj_t;
  
  STATIC mtp_obj_t touchpad_obj[] = {
      {{&machine_touchpad_type}, GPIO_NUM_4, TOUCH_PAD_NUM0},
      {{&machine_touchpad_type}, GPIO_NUM_0, TOUCH_PAD_NUM1},
      {{&machine_touchpad_type}, GPIO_NUM_2, TOUCH_PAD_NUM2},
      {{&machine_touchpad_type}, GPIO_NUM_15, TOUCH_PAD_NUM3},
      {{&machine_touchpad_type}, GPIO_NUM_13, TOUCH_PAD_NUM4},
      {{&machine_touchpad_type}, GPIO_NUM_12, TOUCH_PAD_NUM5},
      {{&machine_touchpad_type}, GPIO_NUM_14, TOUCH_PAD_NUM6},
      {{&machine_touchpad_type}, GPIO_NUM_27, TOUCH_PAD_NUM7},
      {{&machine_touchpad_type}, GPIO_NUM_33, TOUCH_PAD_NUM8},
      {{&machine_touchpad_type}, GPIO_NUM_32, TOUCH_PAD_NUM9},
  };
  
  static int initialized = 0;
  static uint16_t threshold[10] = {0};
  
  
  //------------------------------------------------------------------------------------
  STATIC void mtp_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind)
  {
      mtp_obj_t *self = self_in;
      mp_printf(print, "Touchpad (Pin=%u, TP=%d, Threshold=%u)", self->gpio_id, self->touchpad_id, threshold[self->touchpad_id]);
  }
  
  //-------------------------------------------------------------------------------------------------------
  STATIC mp_obj_t mtp_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_gpio(args[0]);
      const mtp_obj_t *self = NULL;
  
      for (int i = 0; i < MP_ARRAY_SIZE(touchpad_obj); i++) {
          if (pin_id == touchpad_obj[i].gpio_id) {
          	self = &touchpad_obj[i];
          	break;
          }
      }
      if (!self) mp_raise_ValueError("invalid pin for touchpad");
  
      if (!initialized) {
          touch_pad_init();
          initialized = 1;
      }
      threshold[self->touchpad_id] = 0;
      esp_err_t err = touch_pad_config(self->touchpad_id, 0);
      if (err != ESP_OK) {
      	mp_raise_ValueError("Touch pad config error");
      }
      return MP_OBJ_FROM_PTR(self);
  }
  
  //-------------------------------------------------------------
  STATIC mp_obj_t mtp_config(mp_obj_t self_in, mp_obj_t value_in)
  {
      mtp_obj_t *self = self_in;
      uint16_t value = mp_obj_get_int(value_in);
  
      esp_err_t err = touch_pad_config(self->touchpad_id, value);
      if (err != ESP_OK) {
      	mp_raise_ValueError("Touch pad config error");
      }
      threshold[self->touchpad_id] = value;
      return mp_const_none;
  }
  MP_DEFINE_CONST_FUN_OBJ_2(mtp_config_obj, mtp_config);
  
  //----------------------------------------
  STATIC mp_obj_t mtp_read(mp_obj_t self_in)
  {
      mtp_obj_t *self = self_in;
      uint16_t value;
  
      esp_err_t err = touch_pad_read(self->touchpad_id, &value);
      if (err != ESP_OK) {
      	mp_raise_ValueError("Touch pad read error");
      }
      return MP_OBJ_NEW_SMALL_INT(value);
  }
  MP_DEFINE_CONST_FUN_OBJ_1(mtp_read_obj, mtp_read);
  
  
  //========================================================
  STATIC const mp_rom_map_elem_t mtp_locals_dict_table[] = {
      // instance methods
      { MP_ROM_QSTR(MP_QSTR_config),	MP_ROM_PTR(&mtp_config_obj) },
      { MP_ROM_QSTR(MP_QSTR_read),	MP_ROM_PTR(&mtp_read_obj) },
  };
  STATIC MP_DEFINE_CONST_DICT(mtp_locals_dict, mtp_locals_dict_table);
  
  //-------------------------------------------
  const mp_obj_type_t machine_touchpad_type = {
      { &mp_type_type },
      .print = mtp_print,
      .name = MP_QSTR_TouchPad,
      .make_new = mtp_make_new,
      .locals_dict = (mp_obj_t)&mtp_locals_dict,
  };
  