is there some sample code showing how to count external events with TIM3 or TIM4 (with or without interrupt)? I'm using a STM32F429Idisc with HAL library and system workbench.

[TDK]

I don't see any in the Cube repo. Shouldn't be hard to generate an example with CubeMX. You want a timer in external clock mode.

[Tesla DeLorean]

The mechanics here shouldn't be that hard to replicate in HAL. You can set the count period/total for the counter, and don't need to interrupt.

https://community.st.com/s/question/0D53W00000COHcsSAH/is-there-a-sample-code-showing-how-to-count-external-events-on-a-stm32f429i-discovery-using-timer-3-thanks-piero