RGB LED predefined colours

See the code in action on Tinkercad

//https://www.best-microcontroller-projects.com/arduino-digitalwrite.html
#if defined(ARDUINO_AVR_UNO)
  #define setPin(b) ( (b)<8 ? PORTD |=(1<<(b)) : PORTB |=(1<<(b-8)) )
  #define clrPin(b) ( (b)<8 ? PORTD &=~(1<<(b)) : PORTB &=~(1<<(b-8)) )
  #define tstPin(b) ( (b)<8 ? (PORTD &(1<<(b)))!=0 : (PORTB &(1<<(b-8)))!=0 )
#elif defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
  #define setPin(b) ( (b)<8 ? PORTH |=(1<<(b)) : PORTB |=(1<<(b-8)) )
  #define clrPin(b) ( (b)<8 ? PORTH &=~(1<<(b)) : PORTB &=~(1<<(b-8)) )
  #define tstPin(b) ( (b)<8 ? (PORTH &(1<<(b)))!=0 : (PORTB &(1<<(b-8)))!=0 )
#else
    #error Unsupported board selection.
#endif

//#define PIN_TST 13
const uint8_t PinOn13  = 13;

static uint8_t FRED[3]   = {1, 0, 0};
static uint8_t FGREEN[3] = {0, 1, 0};
static uint8_t FBLUE[3]  = {0, 0, 1};

static uint8_t RED[3] = {255, 0, 0};
static uint8_t GREEN[3] = {0, 255, 0};
static uint8_t BLUE[3] = {0, 0, 255};
static uint8_t MAGENTA[3] = {255, 0, 255};
static uint8_t CYAN[3] = {0, 255, 255};
static uint8_t YELLOW[3] = {255, 255, 0};
static uint8_t WHITE[3] = {255, 255, 255};
static uint8_t OFF[3] = {0, 0, 0};

const uint8_t REDLED    = 10;     //180 Ohm Resistor RGB LED (higher resistance to compensate for Red LED being brighter)
const uint8_t GREENLED  = 9;      //100 Ohm Resistor RGB LED
const uint8_t BLUELED   = 8;      //100 Ohm Resistor RGB LED
const uint8_t RDBTNLED  = 6;      //220 Ohm Resistor Red Button LED
const uint8_t GRBTNLED  = 5;      //220 Ohm Resistor Green Button LED

static uint8_t BTNRED[2]   = {1, 0};    //Only RED Button ON
static uint8_t BTNGREEN[2] = {0, 1};    //Only GREEN Button ON
static uint8_t BTNON[2]    = {1, 1};    //Both Buttons ON
static uint8_t BTNOFF[2]   = {0, 0};    //Both Buttons OFF

/*
static uint8_t BTNRED[2]   = {255, 0};    //Only RED Button ON
static uint8_t BTNGREEN[2] = {0, 255};    //Only GREEN Button ON
static uint8_t BTNON[2]    = {255, 255};  //Both Buttons ON
static uint8_t BTNOFF[2]   = {0, 0};      //Both Buttons OFF
*/

void setup () {
 	pinMode(REDLED, OUTPUT);
	pinMode(GREENLED, OUTPUT);
	pinMode(BLUELED, OUTPUT);
    pinMode(RDBTNLED, OUTPUT);
    pinMode(GRBTNLED, OUTPUT);
    pinMode(13, OUTPUT);
}

void loop () {
    setPin(PinOn13);       //Turn ON pin 13 Built-in LED
    // Set color to red
	setColour(RED);
    setBtnRed();
	delay(2000);

  	// Set color to green
	setColour(GREEN);
    setBtnGreen();
	delay(2000);

    // Set color to blue
	setColour(BLUE);
    setBtnBoth();
	delay(2000);

    // Set color to Off
	setColour(OFF);
    clrBtnBoth();
    clrPin(PinOn13);       //Turn OFF pin 13 Built-in LED
	delay(2000);
}

void setColour(uint8_t rgb[3]) {
	colour(rgb[0], rgb[1], rgb[2]);
}

void colour(uint8_t red, uint8_t green, uint8_t blue) {
		analogWrite(REDLED, red);
		analogWrite(GREENLED, green);
		analogWrite(BLUELED, blue);
}

void setBtnRed() {
  setPin(RDBTNLED);
  clrPin(GRBTNLED);
}

void setBtnGreen() {
  setPin(GRBTNLED);
  clrPin(RDBTNLED);
}

void setBtnBoth() {
  setPin(GRBTNLED);
  setPin(RDBTNLED);
}

void clrBtnBoth() {
  clrPin(GRBTNLED);
  clrPin(RDBTNLED);
}

/*
void setBtnColour(uint8_t rgb[2]) {
	btnColour(rgb[0], rgb[1]);
}

void btnColour(uint8_t red, uint8_t green) {
		analogWrite(RDBTNLED, red);
		analogWrite(GRBTNLED, green);
}
*/