Function rtc_calib_cal_code 

pub fn rtc_calib_cal_code(
    _unit: AdcCalibUnit,
    atten: Attenuation,
) -> Option<u16>

Available on crate feature unstable only.

Returns the ADC reference point digital code for specified attenuation.

See https://github.com/espressif/esp-idf/blob/027613140/components/efuse/esp32c6/esp_efuse_rtc_calib.c#L98

Stability

This API is marked as unstable and is only available when the unstable crate feature is enabled. This comes with no stability guarantees, and could be changed or removed at any time.