Hello!

Can I configure MMU in a such way so I can write to a IRAM? What I want is to enable writing to the instruction ram, and then inject some binary code at the beggining of FreeRTOS task creation function to hook onto it.

Is this doable?

imply just use one 2M resistor between the battery and the analog pin. Yes many people do like this. However the discharge curve of cell batteries are very flat until they are almost discharged. So unlikely you can get something like 90%, 75%, 52%.. It will be sort of 100%, 100%, 100%, and then sud...

Your Task2 (protocol handling) is not alone on Core#1 . Arduino also runs on Core#1. Try to switch cores for your protocol generation, let the protocol part to be on Core#0. Just an idea.