mirror of
https://github.com/espressif/esp-idf.git
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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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/*
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* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdint.h>
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#include <string.h>
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#include "esp_types.h"
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#include "esp_err.h"
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#include "esp_log.h"
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#include "driver/adc.h"
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#include "hal/adc_types.h"
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#include "esp_adc_cal.h"
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#define ADC_CAL_CHECK(cond, ret) ({ \
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if(!(cond)){ \
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return ret; \
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} \
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})
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const __attribute__((unused)) static char *TAG = "ADC_CALI";
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esp_err_t esp_adc_cal_get_voltage(adc_channel_t channel,
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const esp_adc_cal_characteristics_t *chars,
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uint32_t *voltage)
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{
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// Check parameters
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ADC_CAL_CHECK(chars != NULL, ESP_ERR_INVALID_ARG);
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ADC_CAL_CHECK(voltage != NULL, ESP_ERR_INVALID_ARG);
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esp_err_t ret = ESP_OK;
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int adc_reading;
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if (chars->adc_num == ADC_UNIT_1) {
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ADC_CAL_CHECK(channel < SOC_ADC_CHANNEL_NUM(0), ESP_ERR_INVALID_ARG);
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adc_reading = adc1_get_raw(channel);
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} else {
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ADC_CAL_CHECK(channel < SOC_ADC_CHANNEL_NUM(1), ESP_ERR_INVALID_ARG);
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ret = adc2_get_raw(channel, chars->bit_width, &adc_reading);
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}
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if (ret == ESP_OK) {
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*voltage = esp_adc_cal_raw_to_voltage((uint32_t)adc_reading, chars);
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}
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return ret;
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}
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