adc2_vref_to_gpio cause 3.6V on GPIO pin

[nitski]

Hi all,

I used the code

Code: Select all

    status = adc2_vref_to_gpio(GPIO_NUM_27);
    if (status == ESP_OK){
        printf("v_ref routed to GPIO\n");
    }else{
        printf("failed to route v_ref\n");
    }

to measure Vref on GPIO 25-27. I got 3.6V on multimeter. What's wrong with that?
I checked couple esp32-bit chips. And multimeter is OK.