Is there a way to reset the internal prescaler counter in input capture mode?

[SCamp.1041]

My timer setup in input capture mode. The ICPrescaler value is set to TIM_ICPSC_DIV2, meaning a capture event will occur on the falling edge of every second pulse.

 

I need to handle an edge case where I need to "reset" the whole input capture system. If I need to handle a reset in-between the first and second triggers, then the internal prescaler counter will be at 1 when I reset/reconfigure, and then the very next input edge will trigger a capture instead of waiting for the full prescaler count of 2

 

 

In order to handle this edge case I need a way to "reset" the internal prescaler counter, however I don't think there is a HAL function to do this.

[TDK]

There's always the nuclear option:

__HAL_RCC_TIMx_FORCE_RESET();
__HAL_RCC_TIMx_RELEASE_RESET();

You can try disabling/reenabling the timer but I don't think it'll reset what you want.

[SCamp.1041]

It doesn't look like these functions exist in my version of the HAL. This is for the F446RE MCU. 

[TDK]

They have existed in the F4 HAL for at least 6 years, likely longer.

stm32f4xx-hal-driver/Inc/stm32f4xx_hal_rcc.h at b6f0ed3829f3829eb358a2e7417d80bba1a42db7 · STMicroelectronics/stm32f4xx-hal-driver

[SCamp.1041]

Ah yes, there they are.

However I can't say calling these has solved my issue. Could you help me understand the intention?

I am guessing I need to trigger the input capture interrupt via software. Triggering an interrupt will consequently clear/reset the capture counter back to 0. Is this the idea?