So I need to execute a function at a constant time interval. I don't think Ticker works because it doesn't take any input for the function. What happen if i want to execute a function with an argument at a fix time interval?

Where's the input coming from? (thinking "Ticker", what would you expect the Ticker to pass to you when it calls back?)

Thanks for a quick responds. It is a function that controls the stepper motor

The function has only input. But isn't it if i use the Ticker, there won't be any input or outputs?

Ticker timer;

function header void stepper_next_step (char mode);

timer.attach(&stepper_next_step,0.02);

it doesn't work.

Make a small wrapper and pass it to the Timer:

void step_1()
{
  stepper_next_step(1);
}

ticker.attach(&step_1, 0.02);

Thanks, Igor. That works! I never know or thought of doing such thing.

Now the next thing is whether i can change the period in real time? This is probably a lot harder to do on mbed, right?

And if it works, I'm pretty sure that's a completely different function, isn't it?

Do detach, then attach with new interval.

Awesome! This is wonderful! Thanks again, Igor!