ESP32 Forum

Basically this issue:
https://github.com/espressif/esp-idf/issues/10055

The ESP32S2 stalls every 2 seconds for 5ms.
This is very annoying when using it for a quadcopter with 2ms cycle time.

ESP32 and ESP8266 do not have that issue.

Without actual code demonstrating the issue, nobody is going to be able to help you. This is very likely a priority issue. Loop task runs at priority 1. Start a new task at priority 6 and put the led flash in that.

The actual code is in the git link. It's: The same code works glitch-free on the old esp32.
Could this be an internal usb thing?

Edit:
I did test moving it to "task1" at priority 1. No 5ms gaps there.
I do not understand it.
Is there a source where i can see the code calling loop() ?

PepeTheGreat wrote: ↑

Thu Mar 28, 2024 9:02 pm

Is there a source where i can see the code calling loop() ?

Yes: https://github.com/espressif/arduino-es ... in.cpp#L69
As you can see, the 'yieldIfNecessary()' is only used on single-core ("UNICORE") ESPs/builds, like the S2.

TY
Explains it.
In the main Arduino loop, above loop() function, in the file cores/esp32/main.cpp we see yieldIfNecessary() function. It works on ESP32-S2 for example as it only has one core. Function adds a 5ms delay every two seconds. Under some specific circumstances, this causes problem with loop() execution time.

https://github.com/espressif/arduino-esp32/issues/6119

Edit:
Works perfectly since i moved the code to another priority 1 task.