audio_datapath_tone_play()

int audio_datapath_tone_play	(	uint16_t	freq,
		uint16_t	dur_ms,
		float	amplitude )

Mixes a tone into the I2S TX stream.

Parameters

freq	Tone frequency [Hz]
dur_ms	Tone duration [ms]. 0 = forever
amplitude	Tone amplitude [0, 1]

Returns

0 if successful, error otherwise