s

_30_arduSerie_ATTiny85_three_PWM_output_.ino

const int Red = 0;
const int Green = 1;
const int Blue = 2;

volatile uint8_t* Port[] = {&OCR0A, &OCR0B, &OCR1B};

void setup() {

  DDRB  |= (1 << DDB4) | (1 << DDB1) | (1 << DDB0);

  TCCR0A = 3 << COM0A0 | 3 << COM0B0 | 3 << WGM00;

  TCCR0B = 0 << WGM02 | 3 << CS00;

  TCCR1 = 0 << PWM1A | 3 << COM1A0 | 7 << CS10;

  GTCCR = 1 << PWM1B | 3 << COM1B0;
}

void SetColour (int colour, int intensity) {
  *Port[colour] = 255 - intensity;
}

void loop() {
  for (int colour = 0; colour < 3; colour++) {
    SetColour((colour + 2) % 3, 0);
    for (int i = 0; i <= 255; i++) {
      SetColour((colour + 1) % 3, i);
      SetColour(colour, 255 - i);
      delay(1);
    }
  }
}