Difference between revisions of "DESK-MX6-L/Peripherals/Audio"

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! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History
 
! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History
 
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date
 
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date
 
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
 
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
 
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{oldid|14107|1.0.0}}
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Oct 2020
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First DESK release
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{oldid|16994|2022/03/03}}
 
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |2023/04/07
 
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |DESK-MX6-L 4.0.0 release
 
 
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Feb 2022
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK 3.0.0 release
 
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<section end="History" />
 
<section end="History" />
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...
 
...
 
...
 
...
−
[    4.408197] fsl-ssi-dai 2028000.ssi: No cache defaults, reading back from HW
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[    5.071782] fsl-ssi-dai 2028000.ssi: No cache defaults, reading back from HW
 
...
 
...
 
...
 
...
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[    4.964996] ALSA device list:
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[    5.624473] ALSA device list:
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[    4.971421]  #0: sbcx-audio-tlv320aic3100
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[    5.635031]  #0: sbcx-audio-tlv320aic3100
 
</pre>
 
</pre>
  
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</pre>
 
</pre>
  
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====Usage [https://alsa-project.org/wiki/SoundcardTesting speaker-test (from alsa-utils)] ====
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====Usage [https://alsa-project.org/wiki/Documentation alsa-utils] ====
  
 
<pre class="workstation-terminal">
 
<pre class="workstation-terminal">
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root@desk-mx6:~# speaker-test -t sine
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root@desk-mx6:~# aplay /home/root/rootfs/unit_tests/ASRC/audio8k16S.wav
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Playing WAVE '/home/root/rootfs/unit_tests/ASRC/audio8k16S.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo
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speaker-test 1.2.6
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</pre>In order to unmute the speaker the <code>alsamixer</code> utility can be used.
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Playback device is default
 
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Stream parameters are 48000Hz, S16_LE, 1 channels
 
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Sine wave rate is 440.0000Hz
 
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Rate set to 48000Hz (requested 48000Hz)
 
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Buffer size range from 3840 to 5760
 
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Period size range from 1920 to 1920
 
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Using max buffer size 5760
 
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Periods = 4
 
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was set period_size = 1920
 
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was set buffer_size = 5760
 
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0 - Front Left
 
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Time per period = 2.889438
 
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...
 
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...
 
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</pre>
 
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In order to unmute the speaker the <code>alsamixer</code> utility can be used.
 
  
 
=== Additional information ===
 
=== Additional information ===

Revision as of 16:23, 3 March 2022

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History
Version Issue Date Notes

1.0.0

Oct 2020 First DESK release
2.0.0 Feb 2022 DESK 3.0.0 release


Peripheral Audio[edit | edit source]

Access to the audio interface is provided by ALSA (Advanced Linux Sound Architecture), which consists in a kernel driver and a users space library for application developers. A set of standard tools (alsa-utils) can be used for simple management of the audio codec.

Device tree configuration[edit | edit source]

Here below an example of device tree configuration used on standard DAVE's kit for the AXEL Lite SOM:

From imx6qdl-sbcx-revb-common.dtsi it is possible to find the codec SSI interface configuration: 

    sound {
        compatible = "fsl,imx-audio-tlv320aic31xx";
        model = "sbcx-audio-tlv320aic3100";
        ssi-controller = <&ssi1>;
        audio-codec = <&codec>;
        audio-routing =
            "Speaker", "SPK",
            "Headphone Jack", "HPL",
            "Headphone Jack", "HPR",
            "MIC1LP", "Line In",
            "MIC1LM", "Line In",
            "MIC1RP", "Mic Jack",
            "Mic Jack", "MICBIAS";
        mux-int-port = <1>;
        mux-ext-port = <3>;
        status = "okay";
    };
...
...
&audmux {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_tlv320aic3x_1>;
    status = "okay";
};

&ssi1 {
    status = "okay";
};
...
...
&iomuxc {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_hog_sbcx &pinctrl_hog_sbcx_one_piece>;
...
...
    tlv320aic3x {
        pinctrl_tlv320aic3x_1: tlv320aic3x_codecgrp-1{
            fsl,pins = <
                MX6QDL_PAD_CSI0_DAT5__AUD3_TXD 0x130b0
                MX6QDL_PAD_CSI0_DAT6__AUD3_TXFS 0x130b0
                MX6QDL_PAD_CSI0_DAT7__AUD3_RXD 0x130b0
                MX6QDL_PAD_CSI0_DAT4__AUD3_TXC 0x130b0
                MX6QDL_PAD_GPIO_3__XTALOSC_REF_CLK_24M 0x130b0

                MX6QDL_PAD_GPIO_4__GPIO1_IO04 0x130b0
            >;
        };
    };

Accessing the peripheral[edit | edit source]

Access to the audio interface is provided by ALSA (Advanced Linux Sound Architecture), which consists in a kernel driver and a users space library for application developers. A set of standard tools alsa-utils can be used for simple management of the audio codec.

Linux messages at boot time[edit | edit source]

...
...
[    5.071782] fsl-ssi-dai 2028000.ssi: No cache defaults, reading back from HW
...
...
[    5.624473] ALSA device list:
[    5.635031]   #0: sbcx-audio-tlv320aic3100

To list the audio sound cards just use the aplay utility: 

root@desk-mx6:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sbcxaudiotlv320 [sbcx-audio-tlv320aic3100], device 0: HiFi tlv320aic31xx-hifi-0 [HiFi tlv320aic31xx-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Usage alsa-utils[edit | edit source]

root@desk-mx6:~# aplay /home/root/rootfs/unit_tests/ASRC/audio8k16S.wav
Playing WAVE '/home/root/rootfs/unit_tests/ASRC/audio8k16S.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo

In order to unmute the speaker the alsamixer utility can be used.

Additional information[edit | edit source]

Information about alsa-utils can be found on ALSA project wiki pages


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