esp-idf/components/efuse/esp32c3/include/esp_efuse_rtc_calib.h

// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at",
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License

#include <esp_types.h>
#include <esp_err.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Get the RTC calibration efuse version
 *
 * @return Version of the stored efuse
 */
int esp_efuse_rtc_calib_get_ver(void);

/**
 * @brief Get the init code in the efuse, for the corresponding attenuation.
 *
 * @param version Version of the stored efuse
 * @param atten  Attenuation of the init code
 * @return The init code stored in efuse
 */
uint16_t esp_efuse_rtc_calib_get_init_code(int version, int atten);

/**
 * @brief Get the calibration digits stored in the efuse, and the corresponding voltage.
 *
 * @param version Version of the stored efuse
 * @param atten         Attenuation to use
 * @param out_digi      Output buffer of the digits
 * @param out_vol_mv    Output of the voltage, in mV
 * @return
 *      - ESP_ERR_INVALID_ARG: If efuse version or attenuation is invalid
 *      - ESP_OK: if success
 */
esp_err_t esp_efuse_rtc_calib_get_cal_voltage(int version, int atten, uint32_t* out_digi, uint32_t* out_vol_mv);

#ifdef __cplusplus
}
#endif