View source for Neo Freerunner audio subsystem

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Return to Neo Freerunner audio subsystem.

Retrieved from "http://wiki.openmoko.org/wiki/Neo_Freerunner_audio_subsystem"
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The Neo Freerunner inherited the audio subsystem from its older brother the Neo 1973. However, there are a few small differences. This page tries to show and explain the differences and points you to the Neo 1973 page whenever it touches the common points (but there may be overlaps for the sake of usability). It is maintained by the Community and therefore it may contain errors and omissions.

Differences from Neo 1973

  • There is only 1 (mono) built-in loud speaker instead of 2 (stereo).
  • Don't know for sure, but the Bluetooth chip seems to be wired differently to the Wolfson Codec.

Possible sound connections through the Wolfson Codec

  • "Yes" = Confirmed, alsa state file exists.
  • "No" = Not possible / not desirable.
  • "Should" = Should be possible, not confirmed yet.
  • "?" = Have no idea.
GSM  ?
Bluetooth  ? Yes
Wired Speaker Should Should  ?
Wired Mic Should Should  ?
Body Earpiece Should Yes  ?
Body Speaker Yes Should  ?
Body Mic Should Yes  ?
- CPU GSM Bluetooth

Alsamixer channel controls

  1. State: GSM <-> Built-in Handset
    1. Possibly working state files: to be defined
    2. Mic volume:
      • Control 48: "Mic2 Capture Volume"
      • Control 12: "Mono Sidetone Playback Volume"
      • Control 5: "Mono Playback Volume"
    3. Speaker volume:
      • Control 6: "Bypass Playback Volume"
      • Control 4: "Speaker Playback Volume"
  2. State: GSM <-> Built-in Handsfree
    1. Possibly working state files: to be defined
    2. Mic volume:
      • to be defined
    3. Speaker volume:
      • to be defined
  3. State: GSM <-> Wired Headset
    1. Possibly working state files: to be defined
    2. Mic volume:
      • Control 49: "Mic1 Capture Volume"
      • Control 12: "Mono Sidetone Playback Volume"
      • Control 5: "Mono Playback Volume"
    3. Speaker volume:
      • Control 6: "Bypass Playback Volume"
      • Control 3: "Headphone Playback Volume"
  4. State: GSM <-> Bluetooth Headset
    1. Possibly working state files: [1]
    2. Mic volume:
      • Control 13: "Mono Voice Playback Volume"
      • Control 5: "Mono Playback Volume"

Specific Software

Angus Ainslie has written a simple python volume control using some of these settings.