tone_gen()

int tone_gen	(	int16_t *	tone,
		size_t *	tone_size,
		uint16_t	tone_freq_hz,
		uint32_t	smpl_freq_hz,
		float	amplitude )

#include <include/tone.h>

Generates one full pulse-code modulation (PCM) period of a tone with the given parameters.

Note

The returned frequency of the tone is the quotient of the sample_freq_hz divided by the tone_freq_hz.

Parameters

tone	User provided buffer. Must be large enough to hold the generated PCM tone, depending on settings.
tone_size	Resulting tone size in bytes.
tone_freq_hz	The desired tone frequency in the range [100..10000] Hz.
smpl_freq_hz	Sampling frequency.
amplitude	Amplitude in the range [0..1].

Return values

0	Tone generated.
-ENXIO	If tone or tone_size is NULL.
-EINVAL	If smpl_freq_hz == 0 or tone_freq_hz is out of range.
-EPERM	If amplitude is out of range.