I need to be able to count pulses that are incoming on a GPIO. What is the best way to do this? Timers?

[NChal.1]

I have an application where I need to count the total number of pulses coming in from a fuel flow sensor. I then take the total number of pulses to display a readout of the total amount of fuel that has flowed through the sensor since the counter began. What would be the best way to do this? Timer? Regular EXTI?

Thanks!

[S.Ma]

how about a tmer which clock input is the sensor's? no interrupts required.

[berendi]

Check out timer external clock modes in the reference manual. Use a 32 bit timer or handle overflows carefully if there going to be more than 65535 pulses.​

[NChal.1]

Thanks for the help. I am trying to use the 32 bit timer 2 for my application. In the ioc application, this is the settings that I am using. Does this look alright? Also, what is the proper way to read the counter of the timer when I am in the main function?

[TDK · Accepted solution]

Looks fine to me. Make sure your period is set to max, if that's what you want.

Proper way to read the timer counter is to read the TIMx->CNT register. TIM2->CNT in this instance. You can read this directly or use the __HAL_TIM_GET_COUNTER macro.

[NChal.1]

I got the timer working the way that I wanted. Thanks for the help!!!