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Volume Control (Autonomous mode)

Farhad Gholami
Prodigy 50 points
Other Parts Discussed in Thread: CC8520

Hello

I like to have a pair of CC8520 operate in Autonomus mode except for volume control.

A small  MCU  in Tx side should be able to change local volume (Master) and Slaves volumes for a wireless subwoofer.

How can we do it?

 Thanks,

  • 0
    TI__Expert 6825 points

    Farhad,

    As it is today, that is not possible. You have to use it in host-controlled operation to change the volume using EHIF.

    When using the CC8520 in autonomous mode you can have your MCU "emulate" a button. However, this does not give the same capabilities for reading out the volume

  • 0
    Prodigy 210 points

    Farhad, implementing the host controll is not a big deal, but what can you do with 20ms delay (latency) in the subwoofer channel?

  • 0 in reply to Alto
    TI__Expert 6825 points

    Hi Alto,

    What do mean by "what can you do with 20ms delay in sub channel"?

    Cheers,

    Pelle

  • 0 in reply to Per H
    Prodigy 210 points

    I mean latency:

    Latency between I2S interface on audio source
    and I2S interface on audio sink. Uncompressed
    16 bit. Audio latency is programmable using the
    PPW Configurator [1].

    min 768 max 2048 samples

     

    As I understand from swru250a.pdf  2.3.2.3 - minimum latency is  ~17ms at 48kHz.

  • 0
    TI__Prodigy 50 points

    Hi Farhad,

    One solution could be to program the slave with an autonomous image and the master with a host controlled image. Since you already decided to have a small MCU on the master side, you only need to activate the network on the master and link the slave as in normal autonomous mode.

    This will enable you to control the input volume on the master side through the host control interface which will have an effect on the output volume on all slaves.This of course requires, that you are using a codec with I2C controlled input volume on the master side.

    Christian