Hardware timer in counting mode. nRF Connect SDK.

[SerhiiR]

Hi,

Is there any example that demonstrates how I can use the Zephyr API to use a hardware timer/counter in counting mode?

I need to count pulses on one of the nRF52840 pins, but I couldn't find an example that could guide me in solving this problem.

[runsiv]

Hi, 

I think the nrfx driver for the GPIOE would be a better option for you https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfx/drivers/gpiote/driver.html

I would take a look at examples mentioned in this question for a place to start  RE: nRF5340 GPIOE 

Regards

Runar

[SerhiiR]

runsiv Thanks for the quick response.

I will look into it in more detail, but on a quick look, I did not see the use of a timer.

In my application, the timer is needed to eventually get the frequency at which the pulses come to the nRF52840 pin.

[runsiv]

Hi, 

I understand, do you know the maximum frequency? 

A similar question was once posted and given this explanation  Frequency Measurement  

This was however using the nrf5 SDK, I will see I can find any better explanations however it will give you a idea of what to do. 

Regards

Runar

[SerhiiR]

Thank you runsiv 

The maximum frequency depends on what electrical components will be put in the node responsible for generating pulses, now I can not tell you a specific frequency.

I will study the link above, and will also look forward to perhaps a more recent example(or information) using Zephyr and the nRF Connect SDK.

[runsiv]

Hi Serhii 

I have managed to dig up this example created by one of my coworkers which should do most of what you are after. I think the only this missing in converting the count to frequency. And its running on NCS. 

https://github.com/too1/ncs-nrfx-pulse-count-example/blob/master/src/main.c

Just a disclaimer: Beware that this code/configuration is not fully tested or qualified and should be considered provided “as-is”. Please test it with your application and let me know if you find any issues

Cheers

Runar

[SerhiiR]

Hi runsiv 

Thank you, this is really an example that can help me solve my problem.
I checked it and it works.

I have one question about it, I'm sure I can figure it out on my own, but maybe I can get a quick answer from you.

In the example, the pin on which the pulses will be coming is set by the function pulse_count_init(pin);

This pin belongs to port gpio0, is there any way to set the pin which belongs to port gpio1?

[runsiv]

Hi, it should be as easy as changing the value in "pulse_count_init(11);" in the main function

Regards
Runar 

[SerhiiR]

Okay, thanks for your help!