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Streaming audio processor load using WL1271 and OMAP3

Steven Blachman
Prodigy 30 points
Other Parts Discussed in Thread: WL1271

I am considering adding the WL1271 (really the TIWI-R2) to an OMAP 3530-based system under Linux so that I can stream audio over Bluetooth and for wireless network connectivity of course.  I am wondering if adding the streaming audio application might overload the processor.  Does anyone have any idea how much of a processing load this will entail?  I have watched the demo videos doing this but I can't tell from that how stressed the OMAP is.

  • 0
    Expert 1585 points

    Hi Steven, 

    You can configure the BT to output A2DP directly to BT PCM lines. So the host application processor won't be overload at all. There are some other options like via HCI packets, and more, depending on your application.

    Do you want to receive audio or transmit audio?

    Elad

  • 0 in reply to Elad Raz92038
    Prodigy 30 points

    I only want to transmit audio over Bluetooth.  If I understand you then, the OMAP can drive the AUD_IN of the module with a PCM signal.  I gather that the processor load to generate this PCM output is low.  Won't there have to be an audio codec running to generate this or is this all supported by the OMAP McBSP peripheral?

    Thanks for your help!

  • 0 in reply to Steven Blachman
    TI__Genius 9240 points

    Hi Steven,

    To perform Audio streaming over PCM bus is the best option as far as CPU load, however we don’t have that offering as part of our catalog offering.

    However we do have A2DP Audio streaming over UART (UART is connected between the Host processor and the WL127x chip), what is the target CPU load that you would like to have?

    Regards,

    Eyal

  • 0 in reply to Eyal a
    Prodigy 30 points

    I am not sure what you mean by saying that PCM is not part of the catalog.  Can you explain this?

    My understanding is that the PCM interface would give me simple voice at 8-64 kbps.  I believe this is the Bluetooth hands-free protocol (HFP) or headset protocol (HSP) that would run over SCO.

    If f I want A2DP then I have to use the HCI UART interface.  I believe that this what you are referring to.  My guess is that this is a much larger CPU load.

    Thanks,

    Steven

  • 0 in reply to Steven Blachman
    Expert 1585 points

    Hi Steven,

    The configuration of the PCM/HCI lines is done using BTS file. The BTS are given as a binary, and that's why i think it's not "catalog". 

    I think you can use external design house (such as our design house) to change the default configuration.

    - Elad