ALSA - Revision history

JulienB: /* Hardware */

2018-07-30T16:09:46Z

‎Hardware

2015-03-26T09:15:19Z

‎First tries

2015-03-26T09:13:55Z

‎Introduction

2015-03-25T08:42:23Z

‎First tries

2015-03-25T08:40:52Z

‎First tries

2015-03-25T08:20:59Z

2015-03-25T08:05:28Z

‎Hardware

2014-02-26T16:53:31Z

‎Usage

2013-02-19T15:32:52Z

‎APF51

2013-02-17T20:48:18Z

‎APF51

@@ Line 9: / Line 9: @@
 # 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
-# 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
 Sound acquisition (on [[TSC2101]], WM8960 and SGTL5000) is done in the reverse way.

@@ Line 176: / Line 176: @@
 # aplay -D "default:CARD=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 APF with Mic Input only) (connect your microphone first ;-) ):
 <pre class="apf">
 # arecord /tmp/foo.wav

@@ Line 3: / Line 3: @@
 ==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 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==

@@ Line 172: / Line 172: @@
 '''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">
-# 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>
 * To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):

@@ Line 170: / Line 170: @@
 </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)
 * To record a test sound (on [[APF27Dev]] or [[APF51Dev]] only) (connect your microphone first ;-) ):
 <pre class="apf">

@@ 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==

@@ Line 18: / Line 18: @@
 ==Usage==
 * Load the ALSA drivers:
-** On APF9328/APF27
+{| cellspacing="20"
 <pre class="apf">
   # modprobe snd-imx-alsa-tsc2102
@@ Line 24: / Line 26: @@
   TSC210x detected
 </pre>
-** On APF51:
+||
 <pre class="apf">
 # modprobe snd-soc-imx-fiq
@@ Line 30: / Line 33: @@
 # modprobe snd-soc-apf51dev-wm8960
 </pre>
 * If you want OSS support (optional):

@@ Line 225: / Line 225: @@
 <source lang="bash">
 #!/bin/sh
-−
 modprobe snd-soc-imx-fiq
 modprobe snd-soc-wm8960