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AM623: Configuring MCASP for S/PDIF TX using Linux

Jason Reeder
Genius 10440 points
Part Number: AM623

Customer would like to configure the MCASP as an S/PDIF transmitter. I see support in the mcasp Linux driver but can't find any documentation in our SDK documentation or devicetree examples.

Any pointers would be appreciated.

  • 0
    TI__Mastermind 28235 points

    Hi Jason,

    The S/PDIF format is supported by the DIT (Digital Audio Interface Transmitter) - transfer mode of the MCASP. 

    Please refer section: 12.1.1.2.2.5S/PDIF Coding Format  

    And section 12.1.1.4.4.1.2 DIT Mode Transmission Data Alignment Settings provides more details in TRM.

    From a software perspective, the first and foremost thing that needs to be done is set the op_mode as DAVINCI_MCASP_DIT_MODE as the driver does support this internally.

    Hope this helps.

    Best Regards,

    Suren

  • 0 in reply to Suren Porwar
    TI__Genius 10440 points

    Suren,

    Understand that the TRM spikes it out and have seen some of the configuration in the MCASP Linux driver.

    Any more help you can give beyond the op_mode? Have we ever shown this mode working under Linux so that I can look at that as an example?

    Jason

  • 0 in reply to Jason Reeder
    TI__Mastermind 28235 points

    Jason,

    I am checking internally with the SW team. Will get back to you with a response early next week.

    Best Regards,

    Suren

  • 0 in reply to Suren Porwar
    TI__Mastermind 28235 points

    Hi Jason,

    Heard back from the SW team, we haven't verified DIT or S/PDIF on any of the newer SOCs. 

    From upstream, we see one omap soc using DIT mode (omap4-l4-abe.dtsi). Please check the OMAP4 boards using DIT mode for more details.

    The only change needed is op_mode specifying DIT as mentioned earlier.

    Best Regards,

    Suren