//define the look up table to have 2^12 entries
#define lookUpTableBits		(12)
#define lookUpTableEntries	(1 << lookUpTableBits)

//function prototypes
void initSine();
void initSquare();
void initSaw();
void initTriang();
void initScintilla();

void initDDS();

void outputNextDDSSample();

volatile uint32_t M;				//DDS magic number
volatile uint16_t currentSignal;	//index for the current DDS signal
volatile uint32_t currentAmplitude;	//amplitude index