Data types and constants

Defines
#define	TRIGINT_ANGLES_PER_CYCLE   0x4000
	The number of angle units per sine wave cycle.
#define	TRIGINT_ANGLE_MAX   0x3FFF
	The maximum angle value, before rolling over to the next cycle.
Typedefs
typedef uint16_t	trigint_angle_t
	A 14-bit angle, 0 - 0x3FFFF.

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Define Documentation

#define TRIGINT_ANGLES_PER_CYCLE   0x4000

The number of angle units per sine wave cycle.

In other words, the number of angle units in a circle.

#define TRIGINT_ANGLE_MAX   0x3FFF

The maximum angle value, before rolling over to the next cycle.

Can be used as a mask to keep the angle within the nominal values:

 trigint_angle_t angle = ... ;
 angle += phaseOffset;
 angle &= TRIGINT_ANGLE_MAX;

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Typedef Documentation

typedef uint16_t trigint_angle_t

A 14-bit angle, 0 - 0x3FFFF.

This divides the circle into 16,384 angle units, instead of the standard 360 degrees. Thus:

• 1 angle unit =~ 360/16384 =~ 0.0219727 degrees
• 1 angle unit =~ 2*M_PI/16384 =~ 0.0003835 radians