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Add support for simple gpio-beepers.
Note that unlike with PWM buzzers, GPIO buzzers can't be controlled
in frequency and thus it doesn't make much sense to use the multiple
argument version of beep with them.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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This driver can be used to drive a piezo-buzzer attached to a PWM.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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SDL 2.0.4 features SDL_QueueAudio, which we could use to just queue
buffers for audio playback. Use it to implement the new sound API for
the sandbox architecture.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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For beeping on PCM sound cards, barebox will need to synthesize samples.
Add basic sine and square wave synthesizers to achieve this.
Client code can either call __synth_F to explicitly select synth F or
synth_F, which depending on CONFIG_SYNTH_SQUARES may expand to either
__synth_F or a gain-adjusted __synth_generate_square.
The latter is mainly useful for slow systems that can't synthesize
enough sine samples in a poller without impacting boot performance.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Add driver core boilerplate for sound support in barebox. Using the
provided API in <sound.h>, consumers can play beeps for a fixed duration
of time.
Playing beeps is not blocking and new beeps can be enqueued while one
is already playing. They will be played in succession by a poller, which
will also turn off the sound card when the beep tune is over.
API is also available for blocking until all beeps are played and for
cancelling an underway beep tune.
The API could be later extended for arbitrary PCM audio, should the
need arise.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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