Auduino and IllutronB

Using Arduino Audio
#1

I would like to have both Auduino and IllutronB on the same device, and use the same pin for audio out.
The synths will not be running at the same time, so no mixing, but I only have one pin available.

IllutronB uses Timer 0, on pin 6 (and 5 for separated channels)
Auduino uses Timer 2, on pin 3

Has anyone tried to change this?

My device now has audio out on pin 6, for the IllutronB, so the best for me would be to "move" Auduino to that pin.
I have little understanding of Timer interrupts, but since they are both 8 bit timers, could I change the Auduino code to use
Timer 0 A, in stead of the TImer 2 B it uses originally?

Change this:

#define PWM_PIN       3
#define PWM_VALUE     OCR2B
#define LED_PIN       13
#define LED_PORT      PORTB
#define LED_BIT       5
#define PWM_INTERRUPT TIMER2_OVF_vect

To this?

#define PWM_PIN       6
#define PWM_VALUE     OCR0A
#define LED_PIN       13
#define LED_PORT      PORTB
#define LED_BIT       5
#define PWM_INTERRUPT TIMER0_OVF_vect

I understand that I can just try it, but was wondering if anyone had tried it, or if there's anything that can go wrong.

There is also this.
What would I have to do here?

void audioOn() {
  // Set up PWM to 31.25kHz, phase accurate
  TCCR2A = _BV(COM2B1) | _BV(WGM20);
  TCCR2B = _BV(CS20);
  TIMSK2 = _BV(TOIE2);
}

Cheers

#2

I have tried some different ways now
I thought I got it right, but I get a compile error

void audioOn() {
  // Set up PWM to 31.25kHz, phase accurate
  TCCR0A = _BV(COM0A1) | _BV(COM0B1) | _BV(WGM00);
  TCCR0B = _BV(CS00);
  TIMSK0 = _BV(TOIE0);
}

As far as I can see, this is the way to set phase accurate on Timer0
But I get the error:
core.a(wiring.c.o): In function __vector_16': C:\Program Files\arduino-1.0.5\hardware\arduino\cores\arduino/wiring.c:49: multiple definition of __vector_16’
Auduino_pin6.cpp.o:C:\Program Files\arduino-1.0.5/Auduino_pin6.ino:138: first defined here

As I understand, it doesn’t like me using Timer0

What does this line do?
#define PWM_INTERRUPT TIMER0_OVF_vect
because if I change it to …Timer0_OVF_vect, it compiles

#3

I have looked at it closer, and it looks like IllutronB uses both Timer1 and 0
Timer0 is used for PWM output, so I guess it doesn't come in conflict with the Delay()

Would it be possible to use Timer0 as output for Auduino as well?
That way I can have the same audio output pin6 for both in the hardware

What do you think DuaneB?

#4

It would be very simple to put the auduino code inside the illutron and switch between the two using a push button.

The Auduino does not know or care which pin its output goes to so just use whichever one the illutron uses.

The easiest way to do this would be to have

Loop()
If auduino pin is high
Auduinoloop
Esle
Illutronloop

And do the same in the isr

Isr
If auduino pin is high
Auduinoisr // change the output pin to match illutron
Else
Illutronisr

This way you have very little code to change, you can even keep the setup function exactly as it is on the illutron, this will work provided you remember to change the auduino isr to use the same pin as illutron

Rushed explanation, getting family ready to go camping, hopefully makes some sense to you ?

Duane B

#5