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  1. #1
    Junior Member
    Join Date
    Dec 2020
    Posts
    3

    Touch SPDIF with EDO and poweroff behavior

    hi ,

    i recently installed the enhanced Digital Output app to connect my touch to nupro A-500 SPDIF.
    The nupro supports a standby function and monitors itís digital inputs.
    Unfortunately the standby function does not work with the SPDIF output from the touch even if the touch is power off from the display.

    I tried to find something here in the forum on the behavior of the SPDIF output when touch is powered off. Unfortunately I was not really successful in finding something.

    Does the EDO and kernel driver allow to switch off the SPDIF when touch is powered off?

    thx

  2. #2
    Senior Member
    Join Date
    Jan 2010
    Location
    Hertfordshire
    Posts
    8,927
    Quote Originally Posted by kreutpet View Post
    hi ,

    i recently installed the enhanced Digital Output app to connect my touch to nupro A-500 SPDIF.
    The nupro supports a standby function and monitors itís digital inputs.
    Unfortunately the standby function does not work with the SPDIF output from the touch even if the touch is power off from the display.

    I tried to find something here in the forum on the behavior of the SPDIF output when touch is powered off. Unfortunately I was not really successful in finding something.

    Does the EDO and kernel driver allow to switch off the SPDIF when touch is powered off?

    thx
    My Touch is connected to a Topping E30 via coax and it also doesn't allow the DAC to enter standby when the Touch is powered off.

    Sent from my Pixel 3a using Tapatalk

  3. #3
    Junior Member
    Join Date
    Dec 2020
    Posts
    3
    I was able to logon to the touch device with ssh

    a dmesg shows that we have alsa :
    Code:
    ALSA device list:
      #0: MXC Freescale with SPDIF
      #1: fab4 (ak4420)
      #2: fab4 (wm8974)
    Code:
    # amixer contents
    numid=1,iface=MIXER,name='IEC958 Playback Default'
      ; type=IEC958,access=rw------,values=1
      : values=[AES0=0x04 AES1=0x02 AES2=0x00 AES3=0x00]
    numid=2,iface=PCM,name='IEC958 Capture Default',device=1
      ; type=IEC958,access=r-------,values=1
    amixer: Control default element read error: Resource temporarily unavailable
    
    numid=4,iface=PCM,name='IEC958 Q-subcode Capture Default',device=1
      ; type=BYTES,access=r-------,values=12
    amixer: Control default element read error: Resource temporarily unavailable
    
    numid=3,iface=PCM,name='IEC958 Subcode Capture Default',device=1
      ; type=IEC958,access=r-------,values=1
    amixer: Control default element read error: Resource temporarily unavailable
    
    numid=7,iface=PCM,name='IEC958 USyncMode CDText',device=1
      ; type=BOOLEAN,access=rw------,values=1
      : values=off
    numid=5,iface=PCM,name='IEC958 V-Bit Errors',device=1
      ; type=BOOLEAN,access=r-------,values=1
      : values=off
    numid=6,iface=PCM,name='RX Sample Rate',device=1
      ; type=INTEGER,access=r-------,values=1,min=16000,max=96000,step=0
      : values=0
    before i mess around, the follwoing command should switch off the SPDIF output.
    Code:
    amixer -c 0 cset name='IEC958 Playback Default' on
    does somebody have experiences with this?
    could a power off on the touch tigger such a command and also on power on?

    thx

  4. #4
    Junior Member
    Join Date
    Dec 2020
    Posts
    3
    i checked now if the following command
    Code:
    amixer -c 0 cset name='IEC958 Playback Default' off
    can be used.

    unfortunately it does not create the expected result. The SPDIF seems to be still on.

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