When the ESP32S2 is in deep-Sleep the ULP/FSM instruction "adc" return alsways 0x1FFF (8191). It's look like the ADC is internally not powered or not working properly in deep-sleep. The example works fine for ESP32, but do not work for ESP32S2:
https://github.com/espressif/esp-idf/tree/master ...

The raw value return by the ULP/FSM assembler instruction ADC is wrong.
I try to get this example running. It works fine for the ESP32, but didn't work for the ESP32S2:
https://github.com/espressif/esp-idf/tree/master/examples/system/ulp_fsm/ulp_adc

Pin GPIO7 (ADC1_CH6) is connected to ground, but ...