Query regarding HAL_GetTick() - what happens when SysTick timer rolls over through zero?

[John123]

Hi - I'm using HAL_GetTick(), and then subtracting one value from another to determine a GPIO input pulse width.

What happens if I happen to to call HAL_GetTick() around the point where the SysTick timer rolls over through zero.

Do I need to watch out for this situation generally?

Regards, John.

[Peter BENSCH]

Yes, you have to consider this problem. Typically, this is only used to determine time differences to a previously saved value, which eliminates the problem, as discussed here, for example.

Hope that helps?

Regards
/Peter

[John123]

Many thanks.