CODEWITHSUNDEEP
arduinoarduino-c++atmega16
Rag
Rag

Reputation: 11

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?

Upvotes: 0

Views: 1342

Answers (1)

Piglet
Piglet

Reputation: 28974

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

Upvotes: 2

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