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ivanseidel / DueTimer

⏳ Timer Library fully implemented for Arduino DUE
MIT License
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Calling setFrequency() with timer active causes callback to stop running #64

Closed fergu closed 3 years ago

fergu commented 6 years ago

I have a program where I want to adjust a frequency of the timer on the fly with the output active. Essentially, I am generating a sine wave and need to sweep through a range of frequencies.

An example code would be:

Timer0.setFrequency(someFreq);
Timer0.start(); // Output looks good
Timer0.setFrequency(someOtherFreq); // Output stops
Timer0.stop();
Timer0.start(); // Output looks good with correct new frequency

As a general rule, someFreq and someOtherFreq are close to each other (Within 1 hz), and both of them are in the 10-50 Hz range.

I'm not sure if changing frequency with the timer active is just unsupported, but I imagine it should be possible since all that is changing is the overflow counter as I understand it. It's possible that I'm doing something boneheaded as well.

henriksod commented 3 years ago

I also need help with this. I am trying to control the speed of stepper motors by using setFrequency on the fly.

fergu commented 3 years ago

@henriksod I ended up doing this by stopping the timer, adjusting the frequency, and restarting the timer like I showed above. It seems to work just fine.

Closing this as that's pretty much the solution I found that worked best.