Which is the right way to start a one-shot timer?

[jefftenney (Jeff)]

I don’t know about intended behavior, but it is explainable behavior that xTimerStartFromIsr() and xTimerResetFromIsr() behave as you observed in tickless idle.

The forum has a couple of different threads that explain. Here is a good one where I managed to save all of humanity:

Timer callback executes immediately after start/reset of timer

I’m using SiliconLabs Gecko SDK v4.1.2 which comes with FreeRTOS Kernel V10.4.3. I’m using FreeRTOS timer to trigger messages to another task after 5 seconds. My code starts/resets the timer when the button is pressed, and stops the timer when released. If I hold the button for 5 seconds, the callback function is called as expected. The problem i’m having is if I press the button (start/reset timer) and release the button (stop timer), then wait 5 seconds, and press the button again (start/…