When in an ISR, no task can interrupt you; the CPU is in interrupt context and will only go back to running tasks when your ISR ends. I understand no actual FreeRTOS task can interrupt my ISR but seeing how the ESP32 supports interrupt levels/priorities could my ISR be interrupted by a higher prior...

I have set up an external interrupt on a pin successfully, I use a FreeRTOS queue to queue some data which is fetched in the main loop(). This works well but I also have to access a variable from both the loop() and the ISR. It is my understanding that my only option is a critical section using port...