mirror of
https://github.com/micropython/micropython.git
synced 2026-04-30 04:40:13 +02:00
Daniël van de Giessen
99 lines
3.5 KiB
C
99 lines
3.5 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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#include "py/mphal.h"
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#include "py/mperrno.h"
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#include "adc.h"
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#include "esp_adc/adc_oneshot.h"
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#include "esp_adc/adc_cali_scheme.h"
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static esp_err_t ensure_adc_calibration(machine_adc_block_obj_t *self, adc_atten_t atten);
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void adc_is_init_guard(machine_adc_block_obj_t *self) {
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if (!self->handle) {
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mp_raise_OSError(MP_EPERM);
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}
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}
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esp_err_t apply_self_adc_channel_atten(const machine_adc_obj_t *self, uint8_t atten) {
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adc_is_init_guard(self->block);
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adc_oneshot_chan_cfg_t config = {
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.atten = atten,
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.bitwidth = self->block->bitwidth,
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};
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esp_err_t ret = adc_oneshot_config_channel(self->block->handle, self->channel_id, &config);
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return ret;
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}
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mp_int_t madcblock_read_helper(machine_adc_block_obj_t *self, adc_channel_t channel_id) {
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adc_is_init_guard(self);
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int reading = 0;
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check_esp_err(adc_oneshot_read(self->handle, channel_id, &reading));
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return reading;
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}
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/*
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During testing, it turned out that the function `adc_cali_raw_to_voltage` does not account for the lower resolution,
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instead it expects the full resolution value as an argument, hence the scaling applied here
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*/
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mp_int_t madcblock_read_uv_helper(machine_adc_block_obj_t *self, adc_channel_t channel_id, adc_atten_t atten) {
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int raw = madcblock_read_helper(self, channel_id);
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int uv = 0;
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check_esp_err(ensure_adc_calibration(self, atten));
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check_esp_err(adc_cali_raw_to_voltage(self->calib[atten], (raw << (ADC_WIDTH_MAX - self->bitwidth)), &uv));
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return (mp_int_t)uv * 1000;
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}
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static esp_err_t ensure_adc_calibration(machine_adc_block_obj_t *self, adc_atten_t atten) {
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if (self->calib[atten] != NULL) {
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return ESP_OK;
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}
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esp_err_t ret = ESP_OK;
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#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
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adc_cali_curve_fitting_config_t cali_config = {
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.unit_id = self->unit_id,
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.atten = atten,
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.bitwidth = self->bitwidth,
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};
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ret = adc_cali_create_scheme_curve_fitting(&cali_config, &self->calib[atten]);
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#else
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adc_cali_line_fitting_config_t cali_config = {
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.unit_id = self->unit_id,
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.atten = atten,
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.bitwidth = self->bitwidth,
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};
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ret = adc_cali_create_scheme_line_fitting(&cali_config, &self->calib[atten]);
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#endif
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return ret;
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}
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