esp_adc_cal_check_efuse() function

Checks if ADC calibration values are burned into eFuse This function checks if ADC reference voltage or Two Point values have been burned to the eFuse of the current ESP32

Syntax

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Summary

Declaration

Definition

from esp_adc_cal.h:40

esp_err_t esp_adc_cal_check_efuse(esp_adc_cal_value_t value_type);

Implemented in esp_adc_cal_legacy.c:269

Arguments

Argument

Description

value_type

Type of calibration value (ESP_ADC_CAL_VAL_EFUSE_VREF or ESP_ADC_CAL_VAL_EFUSE_TP)

source

Return value

- ESP_OK: The calibration mode is supported in eFuse - ESP_ERR_NOT_SUPPORTED: Error, eFuse values are not burned - ESP_ERR_INVALID_ARG: Error, invalid argument (ESP_ADC_CAL_VAL_DEFAULT_VREF)

Notes

in ESP32S2, only ESP_ADC_CAL_VAL_EFUSE_TP is supported. Some old ESP32S2s do not support this, either. In which case you have to calibrate it manually, possibly by performing your own two-point calibration on the chip.