16 bit PWM on a mega

Question

I have two Arduinos, a nano and a mega. I want to output 16 bit PWM, but can seem to only get it working on the nano. I'm adapting the code from this website: http://www.ofrecordings.com/2014/03/16/how-to-set-up-16-bit-pwm-with-an-arduino-uno-atmega328/

void setup() {
 // Set PB1/2 as outputs.
 DDRB |= (1 << DDB1) | (1 << DDB2);
 TCCR1A =
 (1 << COM1A1) | (1 << COM1B1) |
 // Fast PWM mode.
 (1 << WGM11);
 TCCR1B =
 // Fast PWM mode.
 (1 << WGM12) | (1 << WGM13) |
 // No clock prescaling (fastest possible
 // freq).
 (1 << CS10);
 OCR1A = 0;
 // Set the counter value that corresponds to
 // full duty cycle. For 15-bit PWM use
 // 0x7fff, etc. A lower value for ICR1 will
 // allow a faster PWM frequency.
 ICR1 = 0xffff;
}
void loop() {
 // Use OCR1A and OCR1B to control the PWM
 // duty cycle. Duty cycle = OCR1A / ICR1.
 // OCR1A controls PWM on pin 9 (PORTB1).
 // OCR1B controls PWM on pin 10 (PORTB2).
 OCR1A = 0x0000;
 delay(500);
 OCR1A = 0x8000;
 delay(500);
 OCR1A = 0xffff;
 delay(500);
}

That code works on the nano, but not on the mega. I expect that it output PWM on pins 11 and 12, but no luck. Care to explain how I can get it working? It's an entirely different microprocessor, and I'm not sure which parts of the code to change.

Answer 1

Change first line:

 // Set PB1/2 as outputs.
 DDRB |= (1 << DDB1) | (1 << DDB2);`

to the

 // Set PB5/6 as outputs. [**Digital pin 11,12 on Arduino Mega!**]
 DDRB |= (1 << DDB5) | (1 << DDB6);

Now your PWM should work, but on digital pins 11 & 12 [Arduino Mega].

Answer 2

According to this chart: http://arduino.cc/en/Hacking/PinMapping2560

The mega does not support PWM on those digital pins. It looks like 14 of the 54 pins do, use the chart to find which pins to use.