ports/esp32/machine_adc.c - lite/micropython - Linaro Git Browser

 /*
  * This file is part of the MicroPython project, http://micropython.org/
  *
  * The MIT License (MIT)
  *
  * Copyright (c) 2017 Nick Moore
  * Copyright (c) 2021 Jonathan Hogg
  *
  * 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.
  */

 // This file is never compiled standalone, it's included directly from
 // extmod/machine_adc.c via MICROPY_PY_MACHINE_ADC_INCLUDEFILE.

 #include "py/mphal.h"
 #include "adc.h"
 #include "esp_adc/adc_oneshot.h"

 #define ADCBLOCK1 (&madcblock_obj[0])
 #define ADCBLOCK2 (&madcblock_obj[1])

 #if SOC_ADC_RTC_MIN_BITWIDTH <= 9 && SOC_ADC_RTC_MAX_BITWIDTH >= 11
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
     { MP_ROM_QSTR(MP_QSTR_WIDTH_9BIT), MP_ROM_INT(9) }, \
     { MP_ROM_QSTR(MP_QSTR_WIDTH_10BIT), MP_ROM_INT(10) }, \
     { MP_ROM_QSTR(MP_QSTR_WIDTH_11BIT), MP_ROM_INT(11) },
 #else
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11
 #endif

 #if SOC_ADC_RTC_MIN_BITWIDTH <= 12 && SOC_ADC_RTC_MAX_BITWIDTH >= 12
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
     { MP_ROM_QSTR(MP_QSTR_WIDTH_12BIT), MP_ROM_INT(12) },
 #else
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12
 #endif

 #if SOC_ADC_RTC_MIN_BITWIDTH <= 13 && SOC_ADC_RTC_MAX_BITWIDTH >= 13
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
     { MP_ROM_QSTR(MP_QSTR_WIDTH_13BIT), MP_ROM_INT(13) },
 #else
 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13
 #endif

 #define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS \
     { MP_ROM_QSTR(MP_QSTR_ATTN_0DB), MP_ROM_INT(ADC_ATTEN_DB_0) }, \
     { MP_ROM_QSTR(MP_QSTR_ATTN_2_5DB), MP_ROM_INT(ADC_ATTEN_DB_2_5) }, \
     { MP_ROM_QSTR(MP_QSTR_ATTN_6DB), MP_ROM_INT(ADC_ATTEN_DB_6) }, \
     { MP_ROM_QSTR(MP_QSTR_ATTN_11DB), MP_ROM_INT(ADC_ATTEN_DB_11) }, \
     MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
     MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
     MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \

 static const machine_adc_obj_t madc_obj[] = {
     #if CONFIG_IDF_TARGET_ESP32
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_36},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_37},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_38},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_39},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_32},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_33},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_34},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_35},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_4},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_0},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_2},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_15},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_13},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_12},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_14},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_27},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_25},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_26},
     #elif CONFIG_IDF_TARGET_ESP32C3
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_5},
     #elif CONFIG_IDF_TARGET_ESP32C6
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_5},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_6},
     #elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_1},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_2},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_3},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_4},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_5},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_6},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_7},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_8},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_8, GPIO_NUM_9},
     {{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_9, GPIO_NUM_10},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_11},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_12},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_13},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_14},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_15},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_16},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_17},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_18},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_19},
     {{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_20},
     #endif
 };

 static uint8_t madc_obj_atten[MP_ARRAY_SIZE(madc_obj)];

 const machine_adc_obj_t *madc_search_helper(machine_adc_block_obj_t *block, adc_channel_t channel_id, gpio_num_t gpio_id) {
     for (int i = 0; i < MP_ARRAY_SIZE(madc_obj); i++) {
         const machine_adc_obj_t *adc = &madc_obj[i];
         if ((block == NULL || block == adc->block) && (channel_id == -1 || channel_id == adc->channel_id) && (gpio_id == -1 || gpio_id == adc->gpio_id)) {
             return adc;
         }
     }
     return NULL;
 }

 static void mp_machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
     const machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
     mp_printf(print, "ADC(Pin(%u), atten=%u)", self->gpio_id, mp_machine_adc_atten_get_helper(self));
 }

 void madc_init_helper(const machine_adc_obj_t *self, size_t n_pos_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     enum {
         ARG_atten,
     };

     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_atten, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
     };

     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_pos_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);


     if (!self->block->handle) {
         adc_oneshot_unit_init_cfg_t init_config = {
             .unit_id = self->block->unit_id
         };
         check_esp_err(adc_oneshot_new_unit(&init_config, &self->block->handle));
     }

     mp_int_t atten = args[ARG_atten].u_int;
     mp_machine_adc_atten_set_helper(self, atten != -1 ? atten : ADC_ATTEN_MAX);
     mp_machine_adc_block_width_set_helper(self->block, ADC_WIDTH_MAX);
     apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));

 }

 static void mp_machine_adc_init_helper(machine_adc_obj_t *self, size_t n_pos_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     madc_init_helper(self, n_pos_args, pos_args, kw_args);
 }

 static void mp_machine_adc_deinit(machine_adc_obj_t *self) {
     if (self->block->handle) {
         check_esp_err(adc_oneshot_del_unit(self->block->handle));
         self->block->handle = NULL;
     }
 }

 static mp_obj_t mp_machine_adc_make_new(const mp_obj_type_t *type, size_t n_pos_args, size_t n_kw_args, const mp_obj_t *args) {
     mp_arg_check_num(n_pos_args, n_kw_args, 1, MP_OBJ_FUN_ARGS_MAX, true);
     gpio_num_t gpio_id = machine_pin_get_id(args[0]);
     const machine_adc_obj_t *self = madc_search_helper(NULL, -1, gpio_id);
     if (!self) {
         mp_raise_ValueError(MP_ERROR_TEXT("invalid pin"));
     }

     mp_map_t kw_args;
     mp_map_init_fixed_table(&kw_args, n_kw_args, args + n_pos_args);
     madc_init_helper(self, n_pos_args - 1, args + 1, &kw_args);

     return MP_OBJ_FROM_PTR(self);
 }

 static mp_obj_t mp_machine_adc_block(machine_adc_obj_t *self) {
     return MP_OBJ_FROM_PTR(self->block);
 }

 static mp_int_t mp_machine_adc_read(machine_adc_obj_t *self) {
     mp_int_t raw = madcblock_read_helper(self->block, self->channel_id);
     return raw;
 }

 static mp_int_t mp_machine_adc_read_u16(machine_adc_obj_t *self) {
     mp_uint_t raw = madcblock_read_helper(self->block, self->channel_id);
     // Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
     mp_int_t bits = mp_machine_adc_width_get_helper(self);
     mp_uint_t u16 = raw << (16 - bits) | raw >> (2 * bits - 16);
     return u16;
 }

 static mp_int_t mp_machine_adc_read_uv(machine_adc_obj_t *self) {
     return madcblock_read_uv_helper(self->block, self->channel_id, mp_machine_adc_atten_get_helper(self));
 }

 mp_int_t mp_machine_adc_atten_get_helper(const machine_adc_obj_t *self) {
     uint8_t value = madc_obj_atten[self - &madc_obj[0]];
     return value == 0 ? ADC_ATTEN_MAX : value - 1;
 }

 void mp_machine_adc_atten_set_helper(const machine_adc_obj_t *self, mp_int_t atten) {
     if (atten < ADC_ATTEN_MIN || atten > ADC_ATTEN_MAX) {
         mp_raise_ValueError(MP_ERROR_TEXT("invalid attenuation"));
     }

     madc_obj_atten[self - &madc_obj[0]] = atten + 1;
 }

 static void mp_machine_adc_atten_set(machine_adc_obj_t *self, mp_int_t atten) {
     mp_machine_adc_atten_set_helper(self, atten);
     apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));
 }

 mp_int_t mp_machine_adc_width_get_helper(const machine_adc_obj_t *self) {
     return self->block->bitwidth;
 }

 void mp_machine_adc_block_width_set_helper(machine_adc_block_obj_t *self, mp_int_t width) {
     if (width < ADC_WIDTH_MIN || width > ADC_WIDTH_MAX) {
         mp_raise_ValueError(MP_ERROR_TEXT("invalid bit-width"));
     }

     self->bitwidth = width;
 }

 static void mp_machine_adc_width_set(machine_adc_obj_t *self, mp_int_t width) {
     mp_machine_adc_block_width_set_helper(self->block, width);
     apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));
 }
	/*
	* This file is part of the MicroPython project, http://micropython.org/
	*
	* The MIT License (MIT)
	*
	* Copyright (c) 2017 Nick Moore
	* Copyright (c) 2021 Jonathan Hogg
	*
	* 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.
	*/

	// This file is never compiled standalone, it's included directly from
	// extmod/machine_adc.c via MICROPY_PY_MACHINE_ADC_INCLUDEFILE.

	#include "py/mphal.h"
	#include "adc.h"
	#include "esp_adc/adc_oneshot.h"

	#define ADCBLOCK1 (&madcblock_obj[0])
	#define ADCBLOCK2 (&madcblock_obj[1])

	#if SOC_ADC_RTC_MIN_BITWIDTH <= 9 && SOC_ADC_RTC_MAX_BITWIDTH >= 11
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
	{ MP_ROM_QSTR(MP_QSTR_WIDTH_9BIT), MP_ROM_INT(9) }, \
	{ MP_ROM_QSTR(MP_QSTR_WIDTH_10BIT), MP_ROM_INT(10) }, \
	{ MP_ROM_QSTR(MP_QSTR_WIDTH_11BIT), MP_ROM_INT(11) },
	#else
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11
	#endif

	#if SOC_ADC_RTC_MIN_BITWIDTH <= 12 && SOC_ADC_RTC_MAX_BITWIDTH >= 12
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
	{ MP_ROM_QSTR(MP_QSTR_WIDTH_12BIT), MP_ROM_INT(12) },
	#else
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12
	#endif

	#if SOC_ADC_RTC_MIN_BITWIDTH <= 13 && SOC_ADC_RTC_MAX_BITWIDTH >= 13
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
	{ MP_ROM_QSTR(MP_QSTR_WIDTH_13BIT), MP_ROM_INT(13) },
	#else
	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13
	#endif

	#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS \
	{ MP_ROM_QSTR(MP_QSTR_ATTN_0DB), MP_ROM_INT(ADC_ATTEN_DB_0) }, \
	{ MP_ROM_QSTR(MP_QSTR_ATTN_2_5DB), MP_ROM_INT(ADC_ATTEN_DB_2_5) }, \
	{ MP_ROM_QSTR(MP_QSTR_ATTN_6DB), MP_ROM_INT(ADC_ATTEN_DB_6) }, \
	{ MP_ROM_QSTR(MP_QSTR_ATTN_11DB), MP_ROM_INT(ADC_ATTEN_DB_11) }, \
	MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
	MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
	MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \

	static const machine_adc_obj_t madc_obj[] = {
	#if CONFIG_IDF_TARGET_ESP32
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_36},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_37},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_38},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_39},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_32},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_33},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_34},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_35},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_4},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_0},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_2},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_15},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_13},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_12},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_14},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_27},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_25},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_26},
	#elif CONFIG_IDF_TARGET_ESP32C3
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_5},
	#elif CONFIG_IDF_TARGET_ESP32C6
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_5},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_6},
	#elif CONFIG_IDF_TARGET_ESP32S2 \|\| CONFIG_IDF_TARGET_ESP32S3
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_1},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_2},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_3},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_4},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_5},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_6},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_7},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_8},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_8, GPIO_NUM_9},
	{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_9, GPIO_NUM_10},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_11},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_12},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_13},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_14},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_15},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_16},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_17},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_18},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_19},
	{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_20},
	#endif
	};

	static uint8_t madc_obj_atten[MP_ARRAY_SIZE(madc_obj)];

	const machine_adc_obj_t madc_search_helper(machine_adc_block_obj_t block, adc_channel_t channel_id, gpio_num_t gpio_id) {
	for (int i = 0; i < MP_ARRAY_SIZE(madc_obj); i++) {
	const machine_adc_obj_t *adc = &madc_obj[i];
	if ((block == NULL \|\| block == adc->block) && (channel_id == -1 \|\| channel_id == adc->channel_id) && (gpio_id == -1 \|\| gpio_id == adc->gpio_id)) {
	return adc;
	}
	}
	return NULL;
	}

	static void mp_machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
	const machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
	mp_printf(print, "ADC(Pin(%u), atten=%u)", self->gpio_id, mp_machine_adc_atten_get_helper(self));
	}

	void madc_init_helper(const machine_adc_obj_t self, size_t n_pos_args, const mp_obj_t pos_args, mp_map_t *kw_args) {
	enum {
	ARG_atten,
	};

	static const mp_arg_t allowed_args[] = {
	{ MP_QSTR_atten, MP_ARG_KW_ONLY \| MP_ARG_INT, {.u_int = -1} },
	};

	mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
	mp_arg_parse_all(n_pos_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);


	if (!self->block->handle) {
	adc_oneshot_unit_init_cfg_t init_config = {
	.unit_id = self->block->unit_id
	};
	check_esp_err(adc_oneshot_new_unit(&init_config, &self->block->handle));
	}

	mp_int_t atten = args[ARG_atten].u_int;
	mp_machine_adc_atten_set_helper(self, atten != -1 ? atten : ADC_ATTEN_MAX);
	mp_machine_adc_block_width_set_helper(self->block, ADC_WIDTH_MAX);
	apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));

	}

	static void mp_machine_adc_init_helper(machine_adc_obj_t self, size_t n_pos_args, const mp_obj_t pos_args, mp_map_t *kw_args) {
	madc_init_helper(self, n_pos_args, pos_args, kw_args);
	}

	static void mp_machine_adc_deinit(machine_adc_obj_t *self) {
	if (self->block->handle) {
	check_esp_err(adc_oneshot_del_unit(self->block->handle));
	self->block->handle = NULL;
	}
	}

	static mp_obj_t mp_machine_adc_make_new(const mp_obj_type_t type, size_t n_pos_args, size_t n_kw_args, const mp_obj_t args) {
	mp_arg_check_num(n_pos_args, n_kw_args, 1, MP_OBJ_FUN_ARGS_MAX, true);
	gpio_num_t gpio_id = machine_pin_get_id(args[0]);
	const machine_adc_obj_t *self = madc_search_helper(NULL, -1, gpio_id);
	if (!self) {
	mp_raise_ValueError(MP_ERROR_TEXT("invalid pin"));
	}

	mp_map_t kw_args;
	mp_map_init_fixed_table(&kw_args, n_kw_args, args + n_pos_args);
	madc_init_helper(self, n_pos_args - 1, args + 1, &kw_args);

	return MP_OBJ_FROM_PTR(self);
	}

	static mp_obj_t mp_machine_adc_block(machine_adc_obj_t *self) {
	return MP_OBJ_FROM_PTR(self->block);
	}

	static mp_int_t mp_machine_adc_read(machine_adc_obj_t *self) {
	mp_int_t raw = madcblock_read_helper(self->block, self->channel_id);
	return raw;
	}

	static mp_int_t mp_machine_adc_read_u16(machine_adc_obj_t *self) {
	mp_uint_t raw = madcblock_read_helper(self->block, self->channel_id);
	// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
	mp_int_t bits = mp_machine_adc_width_get_helper(self);
	mp_uint_t u16 = raw << (16 - bits) \| raw >> (2 * bits - 16);
	return u16;
	}

	static mp_int_t mp_machine_adc_read_uv(machine_adc_obj_t *self) {
	return madcblock_read_uv_helper(self->block, self->channel_id, mp_machine_adc_atten_get_helper(self));
	}

	mp_int_t mp_machine_adc_atten_get_helper(const machine_adc_obj_t *self) {
	uint8_t value = madc_obj_atten[self - &madc_obj[0]];
	return value == 0 ? ADC_ATTEN_MAX : value - 1;
	}

	void mp_machine_adc_atten_set_helper(const machine_adc_obj_t *self, mp_int_t atten) {
	if (atten < ADC_ATTEN_MIN \|\| atten > ADC_ATTEN_MAX) {
	mp_raise_ValueError(MP_ERROR_TEXT("invalid attenuation"));
	}

	madc_obj_atten[self - &madc_obj[0]] = atten + 1;
	}

	static void mp_machine_adc_atten_set(machine_adc_obj_t *self, mp_int_t atten) {
	mp_machine_adc_atten_set_helper(self, atten);
	apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));
	}

	mp_int_t mp_machine_adc_width_get_helper(const machine_adc_obj_t *self) {
	return self->block->bitwidth;
	}

	void mp_machine_adc_block_width_set_helper(machine_adc_block_obj_t *self, mp_int_t width) {
	if (width < ADC_WIDTH_MIN \|\| width > ADC_WIDTH_MAX) {
	mp_raise_ValueError(MP_ERROR_TEXT("invalid bit-width"));
	}

	self->bitwidth = width;
	}

	static void mp_machine_adc_width_set(machine_adc_obj_t *self, mp_int_t width) {
	mp_machine_adc_block_width_set_helper(self->block, width);
	apply_self_adc_channel_atten(self, mp_machine_adc_atten_get_helper(self));
	}