ESP32 timer and hw_timer_t timer structure

[fanfanlatulipe26]

A classical way to setup a timer is for eample

Code: Select all

hw_timer_t *My_timer = NULL;

My_timer = timerBegin(0, 80, true);
timerAttachInterrupt(My_timer, &onTimer, true);
timerAlarmWrite(My_timer, 1000000, true);
timerAlarmEnable(My_timer);

If this code is in a small init function, do we need to declare My_timer as a global variable or can it be local.
I have a running code where it is local but I am not confortable with that.
I can't find the answer in the doc.

[ESP_Sprite]

It depends. My_timer is only a variable that holds a pointer to the actual timer object. C doesn't do garbage collection, so if that variable goes out of scope, nothing will happen to the timer object itself; there's just no way you can reference it anymore in the rest of your code, but it'll keep on working. That can be acceptable if you never need to modify the timer afterwards anymore.

[fanfanlatulipe26]

Perfectly clear. Thank You for the explanation.