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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"
#include "esp_adc/adc_cali_scheme.h"
#define DEFAULT_VREF 1100
void madcblock_bits_helper(machine_adc_block_obj_t *self, mp_int_t bits) {
if (bits < SOC_ADC_RTC_MIN_BITWIDTH && bits > SOC_ADC_RTC_MAX_BITWIDTH) {
// Invalid value for the current chip, raise exception in the switch below.
bits = -1;
}
switch (bits) {
case 9:
self->width = ADC_BITWIDTH_9;
break;
case 10:
self->width = ADC_BITWIDTH_10;
break;
case 11:
self->width = ADC_BITWIDTH_11;
break;
case 12:
self->width = ADC_BITWIDTH_12;
break;
case 13:
self->width = ADC_BITWIDTH_13;
break;
default:
mp_raise_ValueError(MP_ERROR_TEXT("invalid bits"));
}
self->bits = bits;
if (self->unit_id == ADC_UNIT_1) {
adc1_config_width(self->width);
}
}
mp_int_t madcblock_read_helper(machine_adc_block_obj_t *self, adc_channel_t channel_id) {
int raw = 0;
if (self->unit_id == ADC_UNIT_1) {
raw = adc1_get_raw(channel_id);
} else {
#if (SOC_ADC_PERIPH_NUM >= 2)
check_esp_err(adc2_get_raw(channel_id, self->width, &raw));
#endif
}
return raw;
}
static esp_err_t ensure_adc_calibration(machine_adc_block_obj_t *self, adc_atten_t atten) {
if (self->handle[atten] != NULL) {
return 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->width,
};
return adc_cali_create_scheme_curve_fitting(&cali_config, &self->handle[atten]);
#else
adc_cali_line_fitting_config_t cali_config = {
.unit_id = self->unit_id,
.atten = atten,
.bitwidth = self->width,
};
return adc_cali_create_scheme_line_fitting(&cali_config, &self->handle[atten]);
#endif
}
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;
check_esp_err(ensure_adc_calibration(self, atten));
check_esp_err(adc_cali_raw_to_voltage(self->handle[atten], raw, &uv));
return (mp_int_t)uv * 1000;
}
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