PulseIn function

Hey everyone,

I have a project with a LM555 timer and need to calculate how much time it takes for an input to go from LOW to HIGH and then to LOW again.

Basically, I want to know the period of a square wave generated by the LM555 timer.

I did it with Arduino using the function Pulseln. But I need to do this using a Beaglebone and programming in C++ (Using QtCreator).

Is there a way to "open" the function PulseIn so I know what it does? Moreover, do you guys have any piece of code that might help me?

Thank you in advance.

Andypugh, thank you for the answer.

I need a resolution of about a few microseconds.

I have tried translating the code from arduino to C++ but as you said, it uses many of other arduino "built-in" functions.

Thank you all for the great answers. I believe that the best way will be through PRU. But I was thinking, what if I used PWM reading libraries (black lib for example) on this square wave?

Any thoughts?

Yeah, maybe.

Thank you anyway Andypugh