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micropython/ports/esp32/machine_adc.c

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/*
* 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 "esp_log.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "py/mphal.h"
#include "machine_adc.h"
#define ADCBLOCK1 (&madcblock_obj[0])
#define ADCBLOCK2 (&madcblock_obj[1])
#if CONFIG_IDF_TARGET_ESP32
#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 CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
#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 CONFIG_IDF_TARGET_ESP32S2
#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_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
};
// These values are initialised to 0, which means the corresponding ADC channel is not initialised.
// The madc_atten_get/madc_atten_set functions store (atten+1) here so that the uninitialised state
// can be distinguished from the initialised state.
STATIC uint8_t madc_obj_atten[MP_ARRAY_SIZE(madc_obj)];
static inline adc_atten_t madc_atten_get(const machine_adc_obj_t *self) {
uint8_t value = madc_obj_atten[self - &madc_obj[0]];
return value == 0 ? ADC_ATTEN_MAX : value - 1;
}
static inline void madc_atten_set(const machine_adc_obj_t *self, adc_atten_t atten) {
madc_obj_atten[self - &madc_obj[0]] = atten + 1;
}
const machine_adc_obj_t *madc_search_helper(madcblock_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, madc_atten_get(self));
}
STATIC void madc_atten_helper(const machine_adc_obj_t *self, mp_int_t atten) {
esp_err_t err;
if (self->block->unit_id == ADC_UNIT_1) {
err = adc1_config_channel_atten(self->channel_id, atten);
} else {
err = adc2_config_channel_atten(self->channel_id, atten);
}
if (err != ESP_OK) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid atten"));
}
madc_atten_set(self, atten);
}
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);
mp_int_t atten = args[ARG_atten].u_int;
if (atten != -1) {
madc_atten_helper(self, atten);
} else if (madc_atten_get(self) == ADC_ATTEN_MAX) {
madc_atten_helper(self, ADC_ATTEN_DB_0);
}
}
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 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"));
}
if (self->block->width == -1) {
madcblock_bits_helper(self->block, self->block->bits);
}
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 = self->block->bits;
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) {
adc_atten_t atten = madc_atten_get(self);
return madcblock_read_uv_helper(self->block, self->channel_id, atten);
}
STATIC void mp_machine_adc_atten_set(machine_adc_obj_t *self, mp_int_t atten) {
madc_atten_helper(self, atten);
}
STATIC void mp_machine_adc_width_set(machine_adc_obj_t *self, mp_int_t width) {
madcblock_bits_helper(self->block, width);
}
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