ESP32-S2 pin won't hold during deepsleep

[kjm1102]

I'm in the Pins & GPIO section of https://docs.micropython.org/en/latest/esp32/quickref.html trying to figure out how to hold an esp32-S2 pin during deepsleep. The code runs, I can see pin 34 go low on the multimeter during the 5s sleep,

>>> modpwr=Pin(34, Pin.OUT, value=0, hold=True); modpwr(); sleep(5); modpwr(); deepsleep(30)
0
0

but the pin seems to float as soon as the deepsleep starts and the lte modem power pullup drags it up to 5v. Can some knowledgeable soul please explain what I need to do to get pin34 to hold low during deepsleep?

[davefes]

Found this somewhere on the internet:
GPIO during deepsleep.docx
Maybe pin 34 is a bad choice?

[kjm1102]

According to the datasheet pin34 on the S2 is in the VDD3P3_CPU / VDD_SPI power domain so your esp32.gpio_deep_sleep_hold(True) for a non rtc pin should have worked?

[davefes]

Sorry, I have never tried to hold GPIO in deepsleep.
https://forum.micropython.org/viewtopic.php?t=7470

Only the pins in the RTC power domain can hold during deep sleep because the cpu power domain, which includes the "digital I/O" pins, is turned off. Those latter pins continue the hold when power comes back on.

#8283

Finally found where I got it from ... Deepsleep in the QuickRef !!

[kjm1102]

The 'Only the pins in the RTC power domain can hold during deep sleep' statement is wrong. The 'configuration of non-RTC pins - including output level - can be retained by enabling pad hold on the pin and enabling GPIO pad hold during deep-sleep by calling esp32.gpio_deep_sleep_hold(True):' from your original doc is true. I did

Pin(34, Pin.OUT, value=0, hold=1); esp32.gpio_deep_sleep_hold(1)

and the pin held low through & after deepsleep. So got there finally but I can't find that doc you sent me in the Deepsleep quick ref. Do you have a link I could follow?

[davefes]

https://docs.micropython.org/en/latest/esp32/quickref.html

[kjm1102]

much obliged