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The number of paring slave devices

Nobuyoshi Arai44
Expert 2575 points

Hello PurePath wireless team,

 

We have a question about the specification of PPW configuration firmware.

Would you please check the following question and give any comment?

 

[Block Diagram of this question]

Sound IN ---> [Master A] ---> Connected ---> [Slave A] --- Sound OUT

                                  |

                                  -------> (Start Paring)----> [Slave B]

 

[Initial condition] : Master A and Slave A are connected. Sound is input to Master A and output from Slave A.

 

Basically the relation of PurePath Wireless Master-Slave is 1 by 1 (peer to peer) in our customer’s product.

However, while Master A and Slave A are connected, if they try to change the paring with Master A and Slave B, it looks Master A remembers both Slave A and Slave B.

As a result, Master A is trying to connect both Slave A and Slave B depending on the power condition of Salve A or Slave B.

(If Slave A is on and Slave B is off, Mater A connects with Slave A but if Slave A is off and Slave B is on, Master A connects with Slave B).

 

Thus, we would like to ask you two questions below.

Q1) This is a specification of PurePath Wireless and even if we configure the relation between Master-Slave to 1 by 1 (peer-to-peer), we cannot avoid this condition above easily. Is this correct? Or please give us your opinion of this phenomenon.

 

Q2) Even if we configure the relation between Master-Slave to 1 by 1, after that, can we add more slave devices simultaneously (Slave B, C D and etc…)? (but the actual connection is only 1 by 1 and Master can connect one slave device which the power is on).

If we can add more slave devices, is there any restriction of the number of the paring slave devices can be memorized? If so, what is the maximum number of the paring Slave devices can be memorized?

 

It would be helpful if you can give any comment to this question.

 

Best Regards,

 

Nobu Arai

  • 0
    TI__Expert 3240 points
    Hi,

    Whenever the master is set into "pairing mode" it will allow any slave to connect and to it. It is however possible to add some filtering of devices by using Manufacturer and Product ID. When a slave connects to the master, the slave will save the network ID on its internal flash (possible to have 4 32-bits words saved a once i.e. 4 network IDs). The master does not save any information about what slaves it has paired to.

    When the master starts the network it is a first come, first served mechanism that lets the first available slave device to join the network.
    That means that any slave that has the network ID save, i.e. paired with the master, can potentially join the network.

    If you want to have a strict 1-to-1 relation between a master an a slave, you can pre-pair the devices by writing the network ID for the master into the flash of the slave at configuration. Then you never need to set the master into pairing mode and only the pre-paired slave device has the possibility to join this network.

    Regards,
    Johan