RTOS/CC2642R: How to set counter timer

Part Number:CC2642R

Tool/software: TI-RTOS

Hello,

Im using CC26x2 MCU with SDK 2.10.0.44.

In my project I should connect sensor of gas rate and the data output given by pulse. IO want to count that pulse.

I want to connect the output line of the sensor to DIO and connect the DIO as timer input. By that I will get the tick every 1 sec.

Can anyone guide me how to configure timer, set the timer clock (input) as DIO ? and how to get the ticks ?

How can i set GPTM ??

Thanks!