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https://github.com/espressif/esp-idf.git
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114 lines
4.7 KiB
C
114 lines
4.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2022 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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#pragma once
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#include <stdint.h>
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#include "sdkconfig.h"
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#include "esp_err.h"
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#include "hal/adc_types.h"
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#include "driver/adc_types_legacy.h"
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#include "esp_adc_cal_types_legacy.h"
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#if !CONFIG_ADC_SUPPRESS_DEPRECATE_WARN
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#warning "legacy adc calibration driver is deprecated, please migrate to use esp_adc/adc_cali.h and esp_adc/adc_cali_scheme.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
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/**
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* @brief Checks if ADC calibration values are burned into eFuse
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*
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* This function checks if ADC reference voltage or Two Point values have been
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* burned to the eFuse of the current ESP32
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*
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* @param value_type Type of calibration value (ESP_ADC_CAL_VAL_EFUSE_VREF or ESP_ADC_CAL_VAL_EFUSE_TP)
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* @note in ESP32S2, only ESP_ADC_CAL_VAL_EFUSE_TP is supported. Some old ESP32S2s do not support this, either.
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* In which case you have to calibrate it manually, possibly by performing your own two-point calibration on the chip.
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*
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* @return
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* - ESP_OK: The calibration mode is supported in eFuse
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* - ESP_ERR_NOT_SUPPORTED: Error, eFuse values are not burned
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* - ESP_ERR_INVALID_ARG: Error, invalid argument (ESP_ADC_CAL_VAL_DEFAULT_VREF)
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*/
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esp_err_t esp_adc_cal_check_efuse(esp_adc_cal_value_t value_type);
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/**
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* @brief Characterize an ADC at a particular attenuation
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*
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* This function will characterize the ADC at a particular attenuation and generate
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* the ADC-Voltage curve in the form of [y = coeff_a * x + coeff_b].
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* Characterization can be based on Two Point values, eFuse Vref, or default Vref
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* and the calibration values will be prioritized in that order.
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*
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* @note
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* For ESP32, Two Point values and eFuse Vref calibration can be enabled/disabled using menuconfig.
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* For ESP32s2, only Two Point values calibration and only ADC_WIDTH_BIT_13 is supported. The parameter default_vref is unused.
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*
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*
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* @param[in] adc_num ADC to characterize (ADC_UNIT_1 or ADC_UNIT_2)
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* @param[in] atten Attenuation to characterize
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* @param[in] bit_width Bit width configuration of ADC
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* @param[in] default_vref Default ADC reference voltage in mV (Only in ESP32, used if eFuse values is not available)
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* @param[out] chars Pointer to empty structure used to store ADC characteristics
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*
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* @return
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* - ESP_ADC_CAL_VAL_EFUSE_VREF: eFuse Vref used for characterization
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* - ESP_ADC_CAL_VAL_EFUSE_TP: Two Point value used for characterization (only in Linear Mode)
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* - ESP_ADC_CAL_VAL_DEFAULT_VREF: Default Vref used for characterization
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*/
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esp_adc_cal_value_t esp_adc_cal_characterize(adc_unit_t adc_num,
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adc_atten_t atten,
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adc_bits_width_t bit_width,
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uint32_t default_vref,
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esp_adc_cal_characteristics_t *chars);
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/**
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* @brief Convert an ADC reading to voltage in mV
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*
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* This function converts an ADC reading to a voltage in mV based on the ADC's
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* characteristics.
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*
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* @note Characteristics structure must be initialized before this function
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* is called (call esp_adc_cal_characterize())
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*
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* @param[in] adc_reading ADC reading
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* @param[in] chars Pointer to initialized structure containing ADC characteristics
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*
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* @return Voltage in mV
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*/
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uint32_t esp_adc_cal_raw_to_voltage(uint32_t adc_reading, const esp_adc_cal_characteristics_t *chars);
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/**
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* @brief Reads an ADC and converts the reading to a voltage in mV
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*
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* This function reads an ADC then converts the raw reading to a voltage in mV
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* based on the characteristics provided. The ADC that is read is also
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* determined by the characteristics.
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*
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* @note The Characteristics structure must be initialized before this
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* function is called (call esp_adc_cal_characterize())
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*
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* @param[in] channel ADC Channel to read
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* @param[in] chars Pointer to initialized ADC characteristics structure
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* @param[out] voltage Pointer to store converted voltage
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*
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* @return
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* - ESP_OK: ADC read and converted to mV
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* - ESP_ERR_INVALID_ARG: Error due to invalid arguments
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* - ESP_ERR_INVALID_STATE: Reading result is invalid. Try to read again.
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*/
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esp_err_t esp_adc_cal_get_voltage(adc_channel_t channel, const esp_adc_cal_characteristics_t *chars, uint32_t *voltage);
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#endif //#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
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#ifdef __cplusplus
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}
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#endif
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