#define BUFFER_SIZE 4



// DEBUG LEDS
#define DEBUG_LED0 0x1
#define DEBUG_LED1 0x2
#define DEBUG_LED2 0x4
#define DEBUG_LED3 0x8
#define DEBUG_LED4 0x10

#define DEBUG_MASK ~(DEBUG_LED0|DEBUG_LED1|DEBUG_LED2)
#define DEBUG_PORT PORTB
#define DEBUG_PORT_DDR DDRB