Stops detecting movement when dynamically changing CPU clock

[jmcazaux]

Hi,
first things first, this library is great and as a beginner in the world of ESP32 / embedded / etc., I really appreciate the simplicity.

I am probably in a fairly niche use case, but for my project I need to dynamically change the CPU speed in a pretty extreme way.
Without going too much into details, this is an audio system with a DAB shield and Bluetooth. The DAB shield needs low frequency as the controller is too "radio-magnetically loud" at high frequency and jams signal reception when the bluetooth can only work above 80Mhz.

I am able to switch between 240 and 80MHz, but when trying to go to 10Mhz, the ror-tary encoder stops changing value.
The code can be seen here.

Do you see any obvious reason whey it fails?
Is there a sort of updateCpuClock a little bit like Serial.upodateBaudRate()?

Many thanks in advance if you have any tip!
🙏

[jmcazaux]

For avoidance of doubt:

• I am using PlatformIO
• If I make a test sketch in ArduinoIDE selecting 10Mhz in the UI as clock speed, it works like a charm.
  It seems like this is really due to the switching.

[jmcazaux]

I was able to find a sweet spot (40Mhz where both my DAB shield and RotaryEncoder work.
Please disregard this unless it is useful for you.