Time/timer function

Technical C/C++
1

Hello,

I am trying to include a time/timer function so that in a while loop I can keep track of how long it has been and still being able to run other code.

Also I would like to use it so that when I press a joystick button, the button is disable for say 1 second (so that it only registers 1 press and not registering from consistent pressing).

Could demonstrate how this function works?

Thanks,
Davis

2

The boolean expression

(button_is_pressed && button_was_not_pressed_in_previous_iteration)

does what you want.

It’s true only in the iteration immediately after the button is pressed, and doesn’t become true again until the button is released and pressed again.

3

Thanks, that helps a lot!

Although I am still interested in learning how to use the time/timer feature.

I’m not sure if there is a specific function that can be used as a timer, or if I have to get the time off the cRIO (if possible) and do my own math.

Thanks!

4

I use this macro.


#define GetMsecTime()           (GetFPGATime()/1000)
5

So i just add the #define up with the includes and use the function wherever I need to and do the math from there.

Thanks.

6

That’s right. Typically, it looks like this:


UINT32 startTime = GetMsecTime();
//
// Do something that you want to time.
//
printf("Elapsed time = %d msec
", GetMsecTime() - startTime);
7

There is also a Timer class, but I don’t like it much. Remember to call the Start() method if you use it.