micropython/ports/esp32/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.
*/
#include "py/mphal.h"
#include "adc.h"
#include "driver/adc.h"
#define DEFAULT_VREF 1100
void madcblock_bits_helper(machine_adc_block_obj_t *self, mp_int_t bits) {
switch (bits) {
#if CONFIG_IDF_TARGET_ESP32
case 9:
self->width = ADC_WIDTH_BIT_9;
break;
case 10:
self->width = ADC_WIDTH_BIT_10;
break;
case 11:
self->width = ADC_WIDTH_BIT_11;
break;
#endif
#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
case 12:
self->width = ADC_WIDTH_BIT_12;
break;
#endif
#if CONFIG_IDF_TARGET_ESP32S2
case 13:
self->width = ADC_WIDTH_BIT_13;
break;
#endif
default:
mp_raise_ValueError(MP_ERROR_TEXT("invalid bits"));
}
self->bits = bits;
if (self->unit_id == ADC_UNIT_1) {
adc1_config_width(self->width);
}
for (adc_atten_t atten = ADC_ATTEN_DB_0; atten < ADC_ATTEN_MAX; atten++) {
if (self->characteristics[atten] != NULL) {
esp_adc_cal_characterize(self->unit_id, atten, self->width, DEFAULT_VREF, self->characteristics[atten]);
}
}
}
mp_int_t madcblock_read_helper(machine_adc_block_obj_t *self, adc_channel_t channel_id) {
int raw;
if (self->unit_id == ADC_UNIT_1) {
raw = adc1_get_raw(channel_id);
} else {
check_esp_err(adc2_get_raw(channel_id, self->width, &raw));
}
return raw;
}
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);
esp_adc_cal_characteristics_t *adc_chars = self->characteristics[atten];
if (adc_chars == NULL) {
adc_chars = malloc(sizeof(esp_adc_cal_characteristics_t));
esp_adc_cal_characterize(self->unit_id, atten, self->width, DEFAULT_VREF, adc_chars);
self->characteristics[atten] = adc_chars;
}
mp_int_t uv = esp_adc_cal_raw_to_voltage(raw, adc_chars) * 1000;
return uv;
}