Sorry for pushing this, but since we have to plan our next board revision, some additional hints would be quite helpful here. Would it be a problem if the oscillator runs all the time? [note: also during reboot, deep sleep, etc.] (When power consumption won't matter) If we want the osc to power down...

There is now a github issue regarding this bug:
https://github.com/espressif/esp-idf/issues/1131

Good to hear! You can for post an update in this thread when a fix appears in idf/docs. I will add it now to my main.
Do I delay/NOP between the calls?

When should these bugfix be applied, can you run it at every boot? Could it be integrated in idf or arduino-esp32 by default? How would a code snippet look like?

This problem was also hitting me a few times!

I am using sdkconfig with custom log output: UART1 on GPIO16 and GPIO17. Since a commit from a few days (sorry, can't pinpoint it down) it stopped logging anything after the bootloader. It seams, the output gets somehow disabled. I fixed it (using arduino as idf component) this way, after the first ...

Connect the external clock input to the XTAL_P pin. (This information is actually on page 9 of the datasheet, in the pin descriptions table.) Thanks for the info Angus! I have one question left though: I guess, when you use a crystal, the ESP32 does not allways oscillate this crystal to save power ...

Hey, I've noticed recently some strange behavior: (I am using a custom board with 40MHz and 32kHz crystals, this is also set in sdkconfig) 1. The ESP32 crashes because of a "StoreProhibited", caused by _gettimeofday_r . I call gettimeofday in an if-branch that should never be entered in the given ap...

Hello, could you maybe precise the question a bit? We are using the ESP32 in an industrial environment successfully. But we took some measures (e.g. galvanic isolation, power filtering etc.) to prevent the ESP32 from being disturbed. It all really depends on the application and whether you can keep ...

Do you have good connections on the bus (i.e. no loose wires, breadboard etc?). Also do you have external pullups? I have experienced I2C to be very very sensitive to all sorts of (known an unknown) issues on the esp32. There are a range of topics on the forum and on Github regarding this issue. (se...

I think several people have noticed such problems but so far I could not find any solution rather than just reset the ESP32. Also see: - https://esp32.com/viewtopic.php?f=2&t=2178&p=10265&hilit=i2c#p10265 - https://github.com/espressif/esp-idf/issues/680 - https://github.com/espressif/arduino-esp32/...