235 lines
10 KiB
C
235 lines
10 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Nick Moore
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* Copyright (c) 2021 Jonathan Hogg
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// This file is never compiled standalone, it's included directly from
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// extmod/machine_adc.c via MICROPY_PY_MACHINE_ADC_INCLUDEFILE.
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#include "py/mphal.h"
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#include "adc.h"
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#include "driver/adc.h"
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#define ADCBLOCK1 (&madcblock_obj[0])
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#define ADCBLOCK2 (&madcblock_obj[1])
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#if CONFIG_IDF_TARGET_ESP32
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_9BIT), MP_ROM_INT(9) }, \
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_10BIT), MP_ROM_INT(10) }, \
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_11BIT), MP_ROM_INT(11) },
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#else
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11
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#endif
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#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_12BIT), MP_ROM_INT(12) },
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#else
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12
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#endif
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#if CONFIG_IDF_TARGET_ESP32S2
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_13BIT), MP_ROM_INT(13) },
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#else
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13
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#endif
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS \
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{ MP_ROM_QSTR(MP_QSTR_ATTN_0DB), MP_ROM_INT(ADC_ATTEN_DB_0) }, \
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{ MP_ROM_QSTR(MP_QSTR_ATTN_2_5DB), MP_ROM_INT(ADC_ATTEN_DB_2_5) }, \
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{ MP_ROM_QSTR(MP_QSTR_ATTN_6DB), MP_ROM_INT(ADC_ATTEN_DB_6) }, \
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{ MP_ROM_QSTR(MP_QSTR_ATTN_11DB), MP_ROM_INT(ADC_ATTEN_DB_11) }, \
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MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
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MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
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MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
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STATIC const machine_adc_obj_t madc_obj[] = {
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#if CONFIG_IDF_TARGET_ESP32
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_36},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_37},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_38},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_39},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_32},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_33},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_34},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_35},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_4},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_0},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_2},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_15},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_13},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_12},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_14},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_27},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_25},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_26},
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#elif CONFIG_IDF_TARGET_ESP32C3
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_5},
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_1},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_2},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_3},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_4},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_5},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_6},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_7},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_8},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_8, GPIO_NUM_9},
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{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_9, GPIO_NUM_10},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_11},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_12},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_13},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_14},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_15},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_16},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_17},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_18},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_19},
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{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_20},
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#endif
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};
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// These values are initialised to 0, which means the corresponding ADC channel is not initialised.
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// The madc_atten_get/madc_atten_set functions store (atten+1) here so that the uninitialised state
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// can be distinguished from the initialised state.
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STATIC uint8_t madc_obj_atten[MP_ARRAY_SIZE(madc_obj)];
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static inline adc_atten_t madc_atten_get(const machine_adc_obj_t *self) {
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uint8_t value = madc_obj_atten[self - &madc_obj[0]];
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return value == 0 ? ADC_ATTEN_MAX : value - 1;
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}
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static inline void madc_atten_set(const machine_adc_obj_t *self, adc_atten_t atten) {
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madc_obj_atten[self - &madc_obj[0]] = atten + 1;
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}
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const machine_adc_obj_t *madc_search_helper(machine_adc_block_obj_t *block, adc_channel_t channel_id, gpio_num_t gpio_id) {
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for (int i = 0; i < MP_ARRAY_SIZE(madc_obj); i++) {
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const machine_adc_obj_t *adc = &madc_obj[i];
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if ((block == NULL || block == adc->block) && (channel_id == -1 || channel_id == adc->channel_id) && (gpio_id == -1 || gpio_id == adc->gpio_id)) {
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return adc;
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}
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}
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return NULL;
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}
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STATIC void mp_machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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const machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "ADC(Pin(%u), atten=%u)", self->gpio_id, madc_atten_get(self));
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}
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STATIC void madc_atten_helper(const machine_adc_obj_t *self, mp_int_t atten) {
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esp_err_t err;
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if (self->block->unit_id == ADC_UNIT_1) {
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err = adc1_config_channel_atten(self->channel_id, atten);
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} else {
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err = adc2_config_channel_atten(self->channel_id, atten);
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}
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if (err != ESP_OK) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid atten"));
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}
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madc_atten_set(self, atten);
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}
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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) {
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enum {
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ARG_atten,
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};
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_atten, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_pos_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_int_t atten = args[ARG_atten].u_int;
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if (atten != -1) {
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madc_atten_helper(self, atten);
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} else if (madc_atten_get(self) == ADC_ATTEN_MAX) {
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madc_atten_helper(self, ADC_ATTEN_DB_0);
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}
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}
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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) {
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madc_init_helper(self, n_pos_args, pos_args, kw_args);
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}
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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) {
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mp_arg_check_num(n_pos_args, n_kw_args, 1, MP_OBJ_FUN_ARGS_MAX, true);
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gpio_num_t gpio_id = machine_pin_get_id(args[0]);
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const machine_adc_obj_t *self = madc_search_helper(NULL, -1, gpio_id);
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if (!self) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid pin"));
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}
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if (self->block->width == -1) {
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madcblock_bits_helper(self->block, self->block->bits);
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}
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw_args, args + n_pos_args);
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madc_init_helper(self, n_pos_args - 1, args + 1, &kw_args);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC mp_obj_t mp_machine_adc_block(machine_adc_obj_t *self) {
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return MP_OBJ_FROM_PTR(self->block);
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}
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STATIC mp_int_t mp_machine_adc_read(machine_adc_obj_t *self) {
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mp_int_t raw = madcblock_read_helper(self->block, self->channel_id);
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return raw;
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}
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STATIC mp_int_t mp_machine_adc_read_u16(machine_adc_obj_t *self) {
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mp_uint_t raw = madcblock_read_helper(self->block, self->channel_id);
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// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
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mp_int_t bits = self->block->bits;
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mp_uint_t u16 = raw << (16 - bits) | raw >> (2 * bits - 16);
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return u16;
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}
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STATIC mp_int_t mp_machine_adc_read_uv(machine_adc_obj_t *self) {
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adc_atten_t atten = madc_atten_get(self);
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return madcblock_read_uv_helper(self->block, self->channel_id, atten);
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}
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STATIC void mp_machine_adc_atten_set(machine_adc_obj_t *self, mp_int_t atten) {
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madc_atten_helper(self, atten);
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}
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STATIC void mp_machine_adc_width_set(machine_adc_obj_t *self, mp_int_t width) {
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madcblock_bits_helper(self->block, width);
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}
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