How Arduino tone() was created?

Question

I am trying to understand how tone function works. seems like I can use tone function in a non-PWM channel as well. can you please explain how tome() function was written? If a timer was used then how that was implemented?

You can check out the source code of `tone`: https://github.com/arduino/ArduinoCore-avr/blob/master/cores/arduino/Tone.cpp — CherryDT, Aug 12 '20 at 06:52

score 1 · Accepted Answer · answered Aug 12 '20 at 07:16

The function uses timer interrupts to toggle an output pin.

The timer is set up using the frequency parameter. In the toneBegin function

The pin is toggled for a number of times that is calculated from duration and frequency.

https://github.com/arduino/ArduinoCore-avr/blob/master/cores/arduino/Tone.cpp

How Arduino tone() was created?

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