es9257.h File Reference

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API Description

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Data Structures
struct	_es9257_context

Functions
es9257_context	es9257_init (int32_t pin, int32_t min_pulse_width, int32_t max_pulse_width)
void	es9257_halt (es9257_context dev)
upm_result_t	es9257_set_angle (es9257_context dev, int32_t angle)
upm_result_t	es9257_calc_pulse_travelling (const es9257_context dev, int32_t *ret_val, int32_t value)
void	es9257_set_min_pulse_width (es9257_context dev, int width)
void	es9257_set_max_pulse_width (es9257_context dev, int width)
int	es9257_get_min_pulse_width (es9257_context dev)
int	es9257_get_max_pulse_width (es9257_context dev)

Macros
#define	ES9257_MIN_PULSE_WIDTH   475
#define	ES9257_MAX_PULSE_WIDTH   2100
#define	ES9257_PERIOD   20000
#define	ES9257_MAX_ANGLE   180.0

Typedefs
typedef struct _es9257_context *	es9257_context

Function Documentation

es9257_context es9257_init	(	int32_t	pin,
		int32_t	min_pulse_width,
		int32_t	max_pulse_width
	)

Instantiates a the servo at the given pin

Parameters

pin	Servo pin number
minPulseWidth	Minimum pulse width, in microseconds
maxPulseWidth	Maximum pulse width, in microseconds

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void es9257_halt

(

es9257_context

dev

)

Halts PWM for this servo and allows it to move freely.

upm_result_t es9257_set_angle	(	es9257_context	dev,
		int32_t	angle
	)

Sets the angle of the servo engine.

Parameters

angle

Number between 0 and 180

Returns

0 if successful, non-zero otherwise

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void es9257_set_min_pulse_width	(	es9257_context	dev,
		int	width
	)

Sets the minimum pulse width

Parameters

width

Minimum HIGH signal width

void es9257_set_max_pulse_width	(	es9257_context	dev,
		int	width
	)

Sets the maximum pulse width

Parameters

width

Maximum HIGH signal width

int es9257_get_min_pulse_width

(

es9257_context

dev

)

Returns the minimum pulse width

Returns

Minimum pulse width

int es9257_get_max_pulse_width

(

es9257_context

dev

)

Returns the maximum pulse width

Returns

Maximum pulse width