Gamebuino sound output

[cyberic]

Hello!

I'd like to know which pin is used for sound output.
Is this documented somewhere?

And another question:
Does Gamebuino library use Timer1 and Timer2?

I'd like to use a library that use them as well, so is there a risk of confilct?

Thanks
Eric

[Sorunome]

As far as I know the gamebuino library uses all of Timer1 through Timer4 for various things, including sounds and other.

You can find the schematics of the gamebuino here: http://gamebuino.com/wiki/index.php?title=Hardware

[cyberic]

You can find the schematics of the gamebuino here: http://gamebuino.com/wiki/index.php?title=Hardware

Ha yes sorry I overlooked the document.

As far as I know the gamebuino library uses all of Timer1 through Timer4 for various things, including sounds and other.

Thanks
Is it documented somewhere or should I look at the source code?

[Sorunome]

You can find the schematics of the gamebuino here: http://gamebuino.com/wiki/index.php?title=Hardware

Ha yes sorry I overlooked the document.

As far as I know the gamebuino library uses all of Timer1 through Timer4 for various things, including sounds and other.

Thanks
Is it documented somewhere or should I look at the source code?

I am not sure about this, but you'll probably find answers in the gamebuino library source.

[rodot]

The buzzer is connected to the pin PD3/INT1/OC2B/PCINT19 of the Atmega328, which is the Arduino pin 3 (pwm).

All the atmega328 timers are used by both Arduino and the Gamebuino library:
Timer 0 is for Arduino functions like delay(), millis() and micros(), which are used by the Gamebuino library for timing (framerate regulation and alike).
Timer 1 is used to generate interruptions to update the sound waveform at about 57Khz (it might seem high but it's to manage accurate sound frequency and not to be off-tune)
Timer 2 is used to generate 30Khz PWM output to the pin 3 as a DAC of sound generation
More info about arduino, timers and interruptions : http://letsmakerobots.com/content/arduino-101-timers-and-interrupts

If you disable the sound engine by changing

Code: Select all

#define NUM_CHANNELS 1

to

Code: Select all

#define NUM_CHANNELS 0

in the file settings.c in the Gamebuino library folder, you should be able to use libraries that require timer 1 or 2.

You're not asking for it, but some people might be interested by the Sound page of the wiki which explains how the sound library works (but there is no composer yet...)