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SourceVuESP-IDF Framework and ExamplesESP-IDFadc_vref_to_gpio()

adc_vref_to_gpio() function

Output ADC1 or ADC2's reference voltage to ``adc2_channe_t``'s IO. This function routes the internal reference voltage of ADCn to one of ADC2's channels. This reference voltage can then be manually measured for calibration purposes.

Syntax

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Summary

Declaration

Definition

from adc.h:278

esp_err_t adc_vref_to_gpio(adc_unit_t adc_unit, gpio_num_t gpio);

Implemented in adc_legacy.c:615

Arguments

Argument

Description

adc_unit

ADC unit index

gpio

GPIO number (Only ADC2's channels IO are supported)

Return value

- ESP_OK: v_ref successfully routed to selected GPIO - ESP_ERR_INVALID_ARG: Unsupported GPIO

Notes

ESP32 only supports output of ADC2's internal reference voltage.

References

Code

Location

esp_err_t adc_vref_to_gpio(adc_unit_t adc_unit, gpio_num_t gpio)

adc_legacy.c:615

esp_err_t adc_vref_to_gpio(adc_unit_t adc_unit, gpio_num_t gpio);

adc.h:278

Call Tree

adc_vref_to_gpio() calls 5 functions:

adc_vref_to_gpio()

vPortEnterCritical()

vPortExitCritical()

adc_ll_vref_output()

adc_common_gpio_init()

sar_periph_ctrl_adc_oneshot_power_acquire()

Data Use

adc_vref_to_gpio() reads 4 variables:

adc_unit_t::ADC_UNIT_1

adc_unit_t::ADC_UNIT_2

adc2_channel_t::ADC2_CHANNEL_MAX

adc_channel_io_map

adc_vref_to_gpio()

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