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Audio (SBC-i.MX51) - Versionsgeschichte
2026-05-13T12:46:51Z
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Peter: 1 Version importiert
2023-10-31T08:03:05Z
<p>1 Version importiert</p>
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Peter
https://becomwiki.live.md-websolutions.com/index.php?title=Audio_(SBC-i.MX51)&diff=25&oldid=prev
en>Peter: 1 Version importiert
2023-08-22T19:35:45Z
<p>1 Version importiert</p>
<p><b>Neue Seite</b></p><div>The SBC contains an audio codec to supply interfaces like a standard PC:<br />
* Headphone Stereo Out (<span style="color:#c7e3ca">'''green'''</span> 3,5mm jack)<br />
* Line In Stereo (<span style="color:#7bbdd7">'''blue'''</span> 3,5mm jack)<br />
* Mic In Mono (<span style="color:#f396b5">'''pink'''</span> 3,5mm jack)<br />
<br />
== Linux kernel configuration ==<br />
<br />
Device Drivers ---><br />
<*> I2C support ---><br />
<*> I2C device interface<br />
[*] Autoselect pertinent helper modules<br />
I2C Hardware Bus support ---><br />
<*> MXC I2C support<br />
<*> Sound card support ---><br />
<*> Advanced Linux Sound Architecture ---><br />
<*> OSS Mixer API<br />
<*> OSS PCM (digital audio) API<br />
[*] OSS PCM (digital audio) API - Include plugin system<br />
[*] Support old ALSA API<br />
[*] Verbose procfs contents<br />
<*> ALSA for SoC audio support ---><br />
<M> SoC Audio for the Freescale i.MX CPU<br />
[*] Locate Audio DMA playback buffers in IRAM<br />
<M> SoC Audio support for IMX - SGTL5000<br />
<br />
The OpenEmbedded Linux kernel recipe (''sbc-imx51-kernel_git.bb'') will take care that the following audio kernel modules are loaded at Linux boot.<br />
*snd-soc-sgtl5000<br />
*snd-soc-imx-3stack-sgtl5000<br />
*snd-soc-imx-ssi<br />
*snd-soc-imx<br />
<br />
== Test in Linux ==<br />
<br />
There are some ALSA utilities that you can easily test the sound card with:<br />
<br />
* List available playback devices:<br />
root@sbc-imx51:~# aplay -l<br />
**** List of PLAYBACK Hardware Devices ****<br />
card 0: imx3stack [imx-3stack], device 0: SGTL5000 SGTL5000-PCM-0 []<br />
Subdevices: 1/1<br />
Subdevice #0: subdevice #0<br />
root@sbc-imx51:~#<br />
<br />
* Play sound file on Headphone out:<br />
root@sbc-imx51:~# aplay sample.wav <br />
Playing WAVE 'sample.wav' : Unsigned 8 bit, Rate 8000 Hz, Stereo<br />
root@sbc-imx51:~#aplay sample.wav<br />
<br />
*List available capture devices:<br />
root@sbc-imx51:~# arecord -l<br />
**** List of CAPTURE Hardware Devices ****<br />
card 0: imx3stack [imx-3stack], device 0: SGTL5000 SGTL5000-PCM-0 []<br />
Subdevices: 1/1<br />
Subdevice #0: subdevice #0<br />
root@sbc-imx51:~#<br />
<br />
* Record from Mic in:<br />
alsamixer<br />
In alsamixer, for "ADC Mux", select "MIC_IN". Then start ''arecord'', hit {{sc|Ctrl+c}} to stop.<br />
root@sbc-imx51:~# arecord -D "hw:0,0" -t wav -c 2 -r 48000 -f S16_LE record.wav<br />
Recording WAVE 'record.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo<br />
^CAborted by signal Interrupt...<br />
root@sbc-imx51:~#<br />
<br />
* Record from Line in:<br />
<br />
NOTE: The signal of a microphone is too weak for reasonable results. Instead, connect your PC's Lineout to the SBC's Linein and play any audio signal on your PC.<br />
alsamixer<br />
In alsamixer, for "ADC Mux", select "LINE_IN".<br />
arecord -D "hw:0,0" -t wav -c 2 -r 48000 -f S16_LE record.wav<br />
<br />
[[Category:SBC-i.MX51]]<br />
[[Category:i.MX]]</div>
en>Peter