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This version is outdated by a newer approved version.DiffThis version (09 May 2011 21:47) is a draft.
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Table of Contents

Adding Audio to the Kernel (AD1835A)

Adding Kernel Support - As a module

To add support for the built-in codec AD183X of BF5XX to the kernel build system, a few things must be enabled properly for things to work.The configuration is as following: 

Linux Kernel Configuration
  Device Drivers  ---> 
    Sound  ---> 
      <M> Sound card support
        Advanced Linux Sound Architecture  --->
          <M> Advanced Linux Sound Architecture
          < > Sequencer support
          <M> OSS Mixer API 
          <M> OSS PCM (digital audio) API
          <M>   ALSA for SoC audio support  --->
              <M>   SoC I2S(TDM mode) Audio for the ADI BF5xx chip
              <M>   SoC AD183X Audio support for BF5xx

Doing this will create modules (outside the kernel). The modules will be inserted automatically when it is needed. You can also build sound driver into kernel.

Testing the built in kernel driver

If audio is configured as modules, skip this section. If audio is built into kernel and you have booted the kernel, there are a few things to check to ensure audio is working:

  1. Check the boot messages to see if you have booted the correct kernel. During kernel boot, it should print out:
      Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC).
      ASoC version 0.13.1
      dma rx:3 tx:4, err irq:45, regs:
      asoc: AD183X <-> bf5xx-tdm mapping ok
      ALSA device list:
        #0: bf5xx_ad183x (AD183X)

Testing the audio module

root:/> modprobe snd-ad183x
dma rx:3 tx:4, err irq:45, regs:ffc00800
asoc: AD183X <-> bf5xx-tdm mapping ok
root:/> modprobe snd-pcm-oss
root:/> lsmod
Module                  Size  Used by
snd_pcm_oss            28414  0
snd_mixer_oss          10215  1 snd_pcm_oss
snd_ad183x               801  0
snd_bf5xx_tdm           1857  1 snd_ad183x
snd_soc_ad183x          8033  1 snd_ad183x
snd_soc_bf5xx_tdm       2157  1 snd_ad183x
snd_soc_bf5xx_sport     9392  2 snd_bf5xx_tdm,snd_soc_bf5xx_tdm
snd_soc_core           33839  4 snd_ad183x,snd_bf5xx_tdm,snd_soc_ad183x,snd_soc_bf5xx_tdm
snd_pcm                44936  3 snd_pcm_oss,snd_bf5xx_tdm,snd_soc_core
snd_page_alloc          2753  1 snd_pcm
snd_timer              12412  1 snd_pcm
snd                    32171  5 snd_pcm_oss,snd_mixer_oss,snd_soc_core,snd_pcm,snd_timer
input_core             15713  1 snd
soundcore               3591  1 snd

root:~> tone
TONE: generating sine wave at 1000 Hz...

Testing Audio

  1. Check the output 

root:~> tone
TONE: generating sine wave at 1000 Hz...
You should hear something out of the headphone Jack.

  1. Check and set the audio mixer:

root:/> amixer
Simple mixer control 'Playback Deemphasis',0
  Capabilities: enum
  Items: 'None' '44.1kHz' '32kHz' '48kHz'
  Item0: '48kHz'
Simple mixer control 'ADC High Pass Filter',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'ADC1',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'ADC2',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'DAC1',0
  Capabilities: volume pswitch
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 1023
  Front Left: 1023 [100%] Playback [on]
  Front Right: 1023 [100%] Playback [on]
Simple mixer control 'DAC2',0
  Capabilities: volume pswitch
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 1023
  Front Left: 1023 [100%] Playback [on]
  Front Right: 1023 [100%] Playback [on]
Simple mixer control 'DAC3',0
  Capabilities: volume pswitch
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 1023
  Front Left: 1023 [100%] Playback [on]
  Front Right: 1023 [100%] Playback [on]
  
root:/> amixer sset 'DAC3' 200
Simple mixer control 'DAC3',0
  Capabilities: volume pswitch
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 1023
  Front Left: 200 [20%] Playback [on]
  Front Right: 200 [20%] Playback [on]
Also you can run “alsamixer” to get graphic configuration interface, OSS-based “mixer” can work too.

  1. Check to make sure mp3s work (assuming you have built mp3play),
    1. The first step is to download a mp3 file onto the platform. The wget command assumes that networking is properly configured (you have an IP number, the default gateway is set, and DNS servers can be accessed), and working. See the network setup page for more info. 
      root:/> cd /var
root:/var> wget http://www.radiocrazy.com/shows/A/AbbottCostello/ABCOWhosOnFirstclip.mp3
    2. Next, play it with mp3play: 
      root:/var> mp3play ABCOWhosOnFirstclip.mp3
  2. You can play it in one step with: 
    root:~> mp3play http://www.radiocrazy.com/shows/A/AbbottCostello/ABCOWhosOnFirstclip.mp3
http://www.radiocrazy.com/shows/A/AbbottCostello/ABCOWhosOnFirstclip.mp3: MPEG2-III (0 ms)
  3. Optionally check to make sure the mic and headphone are working properly: 
    root:~> arecord -d 10 test.wav
Recording WAVE "test.wav" : Unsigned 8 bit, Rate 8000 Hz, Mono
root:~> aplay test.wav
    This should record 10 seconds of whatever is on the Line, and then play it back over the output.
  4. You should also be able to do a “talkthrough”, and hear on the speakers anything you put on the line. 
    root:~> arecord | aplay
resources/tools-software/linux-drivers/sound/ad1835a.1304970462.txt.gz · Last modified: 09 May 2011 21:47 by andyr

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