pprz_chirp.h File Reference

#include "std.h"

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Data Structures
struct	chirp_t
	Initialize with chirp_init. More...

Functions
void	chirp_init (struct chirp_t *chirp, float f0_hz, float f1_hz, float length_s, float current_time_s, bool exponential_chirp, bool fade_in)
	Allocate and initialize a new chirp struct.
void	chirp_reset (struct chirp_t *chirp, float current_time_s)
	Reset the time of the chirp.
bool	chirp_is_running (struct chirp_t *chirp, float current_time_s)
	Return if the current_time is within the chirp manoeuvre.
float	chirp_update (struct chirp_t *chirp, float current_time_s)
	Calculate the value at current_time_s and update the struct with current frequency and value.

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Data Structure Documentation

chirp_t

struct chirp_t

Initialize with chirp_init.

Definition at line 59 of file pprz_chirp.h.

Data Fields
float	current_frequency_hz
float	current_time_s
float	current_value
bool	exponential_chirp
float	f0_hz
float	f1_hz
bool	fade_in
float	length_s
float	percentage_done
float	start_time_s
float	total_length_s

Function Documentation

chirp_init()

void chirp_init	(	struct chirp_t *	chirp,
		float	f0_hz,
		float	f1_hz,
		float	length_s,
		float	current_time_s,
		bool	exponential_chirp,
		bool	fade_in
	)

Allocate and initialize a new chirp struct.

set start_time to the current time

Parameters

f0_hz	Minimum frequency of the chirp in Hz
f1_hz	Maximum frequency of the chirp in Hz
length_s	Time interval in s (starting from start_time_s) in which the chirp should be carried out, excluding fade-in time
current_time_s	Current time in s, starting point of the chirp
exponential_chirp	If true, use exponential-time chirp, otherwise use linear-time chirp (see wikipedia)
fade_in	If true, begin the chirp with 2 wavelengths of the lowest frequency, with increasing amplitude

Definition at line 34 of file pprz_chirp.c.

References chirp, chirp_t::current_frequency_hz, chirp_t::current_value, chirp_t::exponential_chirp, chirp_t::f0_hz, chirp_t::f1_hz, chirp_t::fade_in, chirp_t::length_s, chirp_t::percentage_done, chirp_t::start_time_s, and chirp_t::total_length_s.

Referenced by sys_id_chirp_activate_handler(), and sys_id_chirp_init().

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chirp_is_running()

bool chirp_is_running	(	struct chirp_t *	chirp,
		float	current_time_s
	)

Return if the current_time is within the chirp manoeuvre.

Definition at line 65 of file pprz_chirp.c.

References chirp, foo, chirp_t::start_time_s, and chirp_t::total_length_s.

Referenced by chirp_update(), and sys_id_chirp_run().

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chirp_reset()

void chirp_reset	(	struct chirp_t *	chirp,
		float	current_time_s
	)

Reset the time of the chirp.

Parameters

chirp	The chirp struct pointer to reset
current_time_s	The time to set the chirp start at

Definition at line 56 of file pprz_chirp.c.

References chirp, chirp_t::current_frequency_hz, chirp_t::current_time_s, chirp_t::current_value, chirp_t::percentage_done, and chirp_t::start_time_s.

Referenced by start_chirp(), and stop_chirp().

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chirp_update()

float chirp_update	(	struct chirp_t *	chirp,
		float	current_time_s
	)

Calculate the value at current_time_s and update the struct with current frequency and value.

Returns

Current value chirp->current_value

Definition at line 71 of file pprz_chirp.c.

References chirp, CHIRP_C1, CHIRP_C2, chirp_is_running(), chirp_t::current_frequency_hz, chirp_t::current_time_s, chirp_t::current_value, chirp_t::exponential_chirp, chirp_t::f0_hz, chirp_t::f1_hz, chirp_t::fade_in, foo, K, chirp_t::length_s, Min, chirp_t::percentage_done, chirp_t::start_time_s, and chirp_t::total_length_s.

Referenced by sys_id_chirp_run().

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