arduinoarduino-c++atmega16

How Arduino tone() was created?

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?

Solution

  • 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