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Synchronize Rx and Tx Streams on McBSP

Dhar Kurban
Intellectual 960 points
Other Parts Discussed in Thread: OMAPL138

I'm trying to configure the McBSP on the OMAPL138 and I would like to synchronize the Rx and Tx streams.

Is there a way I can use the DIO driver that allows me to Sync the streams?

Note: the hardware configuration prevents me from using an external loopback on the clock pins.

 

The library function is:

SIO_Handle SIO_create(String name, Int mode, size_t size, SIO_Attrs *attrs);

where mode is either SIO_INPUT or SIO_OUTPUT and when this function executes that channel is started.

So how do I start both streams at the same time?

 

Thanks

 

 

  • 0
    TI__Genius 14545 points

    When you my synchronize the streams, do you mean that you need the McBSP to be Transmitting/Receiving with the clocks aligned using some sort of software alignment? Can you explain in detail what you are trying to do at hardware level?

  • 0 in reply to dabuan
    Intellectual 960 points

    Hi

    Yes this is correct.

    On the Omap L138 Eval card I synchronize the streams by having an external loopback on the clock and frame signals.

    By starting the clocks at the same time (after calling the functions as shown above) I am sure the streams are synchronized.

    Without the option of an external loopback I don't see a way to make sure the streams start at the same time.