Trigonometry functions returning 16-bit integer values

Defines
#define	TRIGINT_SIN16_STATIC_TABLE   1
	Compile time macro that can be used to disable the static (compile-time) lookup table.
Functions
int16_t	trigint_sin16 (trigint_angle_t angle)
	Returns the sine of angle as signed 16-bit integer.
int	trigint_sin16_table_size ()
	Returns the size of the lookup table used for signed 16-bit integers.
int16_t	trigint_sin16_table_lookup (int index)
	Lookup a specific table entry for the given index.
void	trigint_sin16_init ()
	Initialize the dynamic table.

---

Define Documentation

#define TRIGINT_SIN16_STATIC_TABLE   1

Compile time macro that can be used to disable the static (compile-time) lookup table.

This can be used to reduce compiled code size at the expense of requiring a call to trigint_sin16_init() at runtime.

---

Function Documentation

int16_t trigint_sin16

(

trigint_angle_t

angle

)

Returns the sine of angle as signed 16-bit integer.

It is scaled to an amplitude of 32,767, thus values will range from -32,767 to +32,767.

Parameters:

angle

the angle to compute the sine of

Returns:

the sine value, as a signed 16-bit integer

int trigint_sin16_table_size

(

)

Returns the size of the lookup table used for signed 16-bit integers.

Returns:

the size of the lookup table used for signed 16-bit integers

Note:

This is generally only needed for debugging purposes.

int16_t trigint_sin16_table_lookup

(

int

index

)

[inline]

Lookup a specific table entry for the given index.

Parameters:

index

a table index

Returns:

the 16-bit signed value at the table entry

Note:

This is generally only needed for debugging purposes.

void trigint_sin16_init

(

)

Initialize the dynamic table.

Must be called before any calls to trigint_sin16(). This is only necessary and available if the TRIGINT_SIN16_STATIC_TABLE macro is set to 0.