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