ALSA - Revision history

JulienB: /* Hardware */

2018-07-30T16:09:46Z

Hardware

← Older revision		Revision as of 18:09, 30 July 2018
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	# the i.MX is connected to an audio CODEC (like the [[TSC2102]] on the [[APF9328DevFull]], the [[TSC2101]] on the [[APF27Dev]], the WM8960 on the [[APF51Dev]] or the SGTL5000 on the [[APF6Dev]]) through one of its SSI interfaces		# the i.MX is connected to an audio CODEC (like the [[TSC2102]] on the [[APF9328DevFull]], the [[TSC2101]] on the [[APF27Dev]], the WM8960 on the [[APF51Dev]] or the SGTL5000 on the [[APF6Dev]]) through one of its SSI interfaces
	# the i.MX takes PCM data (ALSA format) from memory and send them (through DMA) to the SSI module		# the i.MX takes PCM data (ALSA format) from memory and send them (through DMA) to the SSI module
	# this one converts the data to a serial ~~stream of bits~~ in [http://en.wikipedia.org/wiki/I%C2%B2S the I2S format] (or AC97). That stream is then sent to the CODEC		# this one converts the data to a serial bitstream in [http://en.wikipedia.org/wiki/I%C2%B2S the I2S format] (or AC97). That stream is then sent to the CODEC
	# the stream is converted by the CODEC's DAC to an analog sound		# the stream is converted by the CODEC's DAC to an analog sound
	Sound acquisition (on [[TSC2101]], WM8960 and SGTL5000) is done in the reverse way.		Sound acquisition (on [[TSC2101]], WM8960 and SGTL5000) is done in the reverse way.

JulienB: /* First tries */

2015-03-26T09:15:19Z

First tries

← Older revision		Revision as of 11:15, 26 March 2015
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	# aplay -D "default:CARD=name_of_card" /usr/share/sounds/alsa/Side_Left.wav		# aplay -D "default:CARD=name_of_card" /usr/share/sounds/alsa/Side_Left.wav
	</pre>		</pre>
	* To record a test sound (on ~~[[APF27Dev]] or [[APF51Dev]]~~ only) (connect your microphone first ;-) ):		* To record a test sound (on APF with Mic Input only) (connect your microphone first ;-) ):
	<pre class="apf">		<pre class="apf">
	# arecord /tmp/foo.wav		# arecord /tmp/foo.wav

JulienB: /* Introduction */

2015-03-26T09:13:55Z

Introduction

← Older revision		Revision as of 11:13, 26 March 2015
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	==Introduction==		==Introduction==
	ALSA stands for ''Advanced Linux Sound Architecture'' and provides audio and MIDI functionality to the Linux operating system. Everyone wanting to write portable & state of the art Linux applications dealing with sound should consider using ALSA.<br>		ALSA stands for ''Advanced Linux Sound Architecture'' and provides audio and MIDI functionality to the Linux operating system. Everyone wanting to write portable & state of the art Linux applications dealing with sound should consider using ALSA.<br>
	ALSA is composed of a low level part (target specific Linux drivers) and a userspace library (libasound) with a lot of tools (aplay, arecord, alsamixer).		ALSA is composed of a low level part (target specific Linux drivers) and a userspace library (''libasound'') with a lot of tools (''aplay, arecord, alsamixer, speaker-test'').

	==Hardware==		==Hardware==

JulienB: /* First tries */

2015-03-25T08:42:23Z

First tries

← Older revision		Revision as of 10:42, 25 March 2015
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	'''Note:''' the audio file ''Side_Left.wav'' can be copied from your Linux host (if not already on your rootfs)		'''Note:''' the audio file ''Side_Left.wav'' can be copied from your Linux host (if not already on your rootfs)

	If you have several sound cards, sound is played on the first one in previous list. To choose a given sound card, do:		If you have several sound cards, sound is played on the first one in [[ALSA#First_checks_.28optionnal.29\|previous list]]. To choose a given sound card, do:
	<pre class="apf">		<pre class="apf">
	# aplay -D "default:name_of_card" /usr/share/sounds/alsa/Side_Left.wav		# aplay -D "default:CARD=name_of_card" /usr/share/sounds/alsa/Side_Left.wav
	</pre>		</pre>
	* To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):		* To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):

JulienB: /* First tries */

2015-03-25T08:40:52Z

First tries

← Older revision		Revision as of 10:40, 25 March 2015
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	</pre>		</pre>

	Note: ~~the~~ ''audio file Side_Left.wav'' can be copied from your Linux host (if not already on your rootfs)		'''Note:''' the audio file ''Side_Left.wav'' can be copied from your Linux host (if not already on your rootfs)

			If you have several sound cards, sound is played on the first one in previous list. To choose a given sound card, do:
			<pre class="apf">
			# aplay -D "default:name_of_card" /usr/share/sounds/alsa/Side_Left.wav
			</pre>
	* To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):		* To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):
	<pre class="apf">		<pre class="apf">

JulienB at 08:20, 25 March 2015

2015-03-25T08:20:59Z

@@ Line 73: / Line 73: @@
 </pre>
-* To check if the [[TSC2102]]/[[TSC2101]] was detected as a sound chip:
+* To check if the CODEC was detected as a sound chip:
 <pre class="apf">
 # aplay -lL
 default:CARD=IMX-ALSA
@@ Line 92: / Line 97: @@
                        Freescale i.MX with TSC210x codec
 </pre>
 ==Setting playback and capture volume==

JulienB: /* Hardware */

2015-03-25T08:05:28Z

Hardware

← Older revision		Revision as of 10:05, 25 March 2015
Line 7:		Line 7:
	==Hardware==		==Hardware==
	On the i.MX family, used on the Armadeus boards, (good quality) sound can be produced that way:		On the i.MX family, used on the Armadeus boards, (good quality) sound can be produced that way:
	# the i.MX is connected to an audio CODEC (like the [[TSC2102]] on the [[APF9328DevFull~~\|APF9328~~]], the [[TSC2101]] on the [[~~APF27~~]] or the WM8960 on the [[APF51Dev]]) through one of its SSI interfaces		# the i.MX is connected to an audio CODEC (like the [[TSC2102]] on the [[APF9328DevFull]], the [[TSC2101]] on the [[APF27Dev]], the WM8960 on the [[APF51Dev]] or the SGTL5000 on the [[APF6Dev]]) through one of its SSI interfaces
	# the i.MX takes PCM data (ALSA format) from memory and send them (through DMA) to the SSI module		# the i.MX takes PCM data (ALSA format) from memory and send them (through DMA) to the SSI module
	# this one converts the data to a serial stream of bits in [http://en.wikipedia.org/wiki/I%C2%B2S the I2S format] (or AC97). That stream is then sent to the CODEC		# this one converts the data to a serial stream of bits in [http://en.wikipedia.org/wiki/I%C2%B2S the I2S format] (or AC97). That stream is then sent to the CODEC
	# the stream is converted by the CODEC's DAC to an analog sound		# the stream is converted by the CODEC's DAC to an analog sound
	Sound acquisition (on [[TSC2101]] & WM8960 ~~only~~) is done in the reverse way.		Sound acquisition (on [[TSC2101]], WM8960 and SGTL5000) is done in the reverse way.

	==Installation==		==Installation==

JulienB: /* Usage */

2014-02-26T16:53:31Z

Usage

← Older revision		Revision as of 18:53, 26 February 2014
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	==Usage==		==Usage==
	* Load the ALSA drivers:		* Load the ALSA drivers:
	** On APF9328/APF27		{\| cellspacing="20"
			\|\|
			* On APF9328/APF27:
	<pre class="apf">		<pre class="apf">
	# modprobe snd-imx-alsa-tsc2102		# modprobe snd-imx-alsa-tsc2102
Line 24:		Line 26:
	TSC210x detected		TSC210x detected
	</pre>		</pre>
	** On APF51:		\|\|
			* On APF51:
	<pre class="apf">		<pre class="apf">
	# modprobe snd-soc-imx-fiq		# modprobe snd-soc-imx-fiq
Line 30:		Line 33:
	# modprobe snd-soc-apf51dev-wm8960		# modprobe snd-soc-apf51dev-wm8960
	</pre>		</pre>
			\|\|
			* Other boards:
			not needed



			\|}

	* If you want OSS support (optional):		* If you want OSS support (optional):

Jorasse: /* APF51 */

2013-02-19T15:32:52Z

APF51

← Older revision		Revision as of 17:32, 19 February 2013
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	<source lang="bash">		<source lang="bash">
	#!/bin/sh		#!/bin/sh

	modprobe snd-soc-imx-fiq		modprobe snd-soc-imx-fiq
	modprobe snd-soc-wm8960		modprobe snd-soc-wm8960

Jorasse: /* APF51 */

2013-02-17T20:48:18Z

APF51

← Older revision		Revision as of 22:48, 17 February 2013
Line 226:		Line 226:
	#!/bin/sh		#!/bin/sh

	modprobe snd-imx-~~alsa~~-~~tsc2102~~		modprobe snd-soc-imx-fiq
			modprobe snd-soc-wm8960
			modprobe snd-soc-apf51dev-wm8960
	# default values for Audio out:		# default values for Audio out:
	amixer cset numid=40 on		amixer cset numid=40 on