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Application Level Access to Sync Counter on Slave Device

Al Slamecka
Prodigy 40 points

Hello -

I am curious to know if there is any way to expose / convert the timing reference counters on the slave devices such that they can be accessed via an application.  The purpose would be to associate and capture a synchronized counter with the audio stream at each slave device.

Thanks!

Al

  • 0
    TI__Expert 7160 points

    Hi Al,

    I'm not sure I understand completely.. Do you want to retrieve a counter over EHIF (External Host Interface over SPI between MCU and CC85xx)?

    -Kristoffer

  • 0 in reply to Kristoffer S
    Prodigy 40 points

    Hi Kristoffer - 

    If that method were available I believe that would be fine.  My question assumed that was not possible via EHIF so I asked it a bit more open-endedly in case there were other mechanisms to retrieve the slave counter that is used for clock synchronization.  Being able to have a sync'd precise reference time that I can associate with the audio stream is necessary for my application.

    Hope this is a bit clearer.

    Al

  • 0 in reply to Al Slamecka
    TI__Expert 7160 points

    Al,

    Can you use the WCLK output on the slaves directly? Here's info from the Wireless Clock Distribution chapter in the CC85xx Family User's Guide:

    "The counter values have sufficient precision that low-jitter replication of the reference clock is possible. The
    resulting clock distribution ensures that the latency variation across the wireless audio network, as seen on
    the pins on the audio serial interfaces, will be less than ±1 sample for an audio input clock with low to
    moderate jitter."

    -Kristoffer

  • 0 in reply to Kristoffer S
    Prodigy 40 points

    Let me check if that is a workable solution and get back to you.  Thanks for the good suggestion!

    Al