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DM6467T and S/PDIF

James Kinnersley
Prodigy 10 points
Other Parts Discussed in Thread: TMS320DM6467T

Hi,

I'm having trouble getting S/PDIF audio output to work on a DM6467T EVM.

I have patched the kernel so that I can at least write a wav file to the device using aplay. However, the sound comes out as a hiss.

Is this a known problem and is there a work around (kernel/driver patch)?

Any help or information would be much appreciated.

JamesK

  • 0
    TI__Mastermind 30160 points

    >>>>>Brief description of your request: We have purchased several TI TMS320DM6467T EVM boards but S/PDIF audio output does not seem to work.
    Can you tell us if there is a software/operating system patch or workaround for this?
    We are running DVSDK Version 3.10

    a) Regarding the HW interface:
    - The DM6467T McASP peripherals supports S/PDIF receive so theorically you can receive S/PDIF.
    - For the EVM, Spectrum Digital does provide low level tests (none OS based) in order to diagnose the EVM HW.
    There is an SPDIF C example provided too as part of the Target content SW package:
    http://support.spectrumdigital.com/boards/evmdm6467t/revc/
    Those code example Assume that you use CCS and a JTAG emulator to load the code in the target.

    b) Linux support for S/PDIF?
    - As mentionned in the DM6467T PSP docs the SPDIF is not tested:
    http://processors.wiki.ti.com/index.php/DaVinci_%28ARM9%29_PSP_Releases#DM6467.2FDM6467T
    May be some code is present for S/PDIF but it is not tested.

    Also it seems that there have been number of E2E posts for using S/PDIF with Linux on TI processors but there has not been much answers on the topic.
    PCM and I2S are likely to be supported by the Alsa driver already.But if you need true S/PDIF support then I would think that you will need to have a closer look and probably had the S/PDIF support by yourself (or may be with help of third party).

    Hope it helps.

    Anthony