// Bit positions - 0 is LSB
#define LED_RED_BIT_NUM   3
#define LED_GREEN_BIT_NUM 0
#define LED_BLUE_BIT_NUM  1

// Bit values
#define LED_RED_BIT    (1<<LED_RED_BIT_NUM)
#define LED_GREEN_BIT  (1<<LED_GREEN_BIT_NUM)
#define LED_BLUE_BIT   (1<<LED_BLUE_BIT_NUM)

variable = LED_RED_BIT | LED_GREEN_BIT | LED_BLUE_BIT;   // RGB lit
variable = LED_RED_BIT |                 LED_BLUE_BIT;   // R_B lit