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DA16200 Full-Duplex SPI

wenkai

Hello,

I’m using DA16200’s SPI HAL to talk to an Intan RHD2132 (which requires a 16-bit full-duplex transfer: MOSI sends a command while MISO returns 16-bit data). The current examples show only half-duplex (write-then-read), and this mode limits my maximum sampling rate.

  1. Does the DA16200 SPI hardware support true full-duplex? If so, which SPICR/SPIFCR bits must be set (e.g., equivalent of “full-duplex mode”)?

  2. Are there any sample code or register settings to drive simultaneous TX/RX (CPOL=0, CPHA=1) for a single 16-bit transaction?

  3. If the HAL does not support full-duplex, what’s the recommended way to modify spi_transfer() (or related driver code) to assert TX and RX at the same time?

Any concise guidance or code snippets would be greatly appreciated. Thank you!

  • 0

    Hi There,

    Thank you for posting your question online.
    I need to check on this and I will get back to you as soon as possible.

    Best Regards,
    OV_Renesas

  • 0 in reply to OV_Renesas

    Thank you for your prompt response. To clarify the issue further, I am referring to the UM-WI-002 user manual’s description of SPI_WRITE_READ():

    SPI write and read operation (write before read. This function will run in concatenation mode internally.)

    Although the documentation states that full-duplex is supported, the “write-before-read” concatenation mode effectively behaves like half-duplex: it performs the entire write phase first, then immediately switches to a read phase using a separate sequence of clock pulses. In other words, MOSI and MISO are not active simultaneously on the same clock edges—this appears as a write-then-read operation rather than true full-duplex transfer.

    Could you please confirm whether there is a way to force a single 16-bit SPI transaction where MOSI and MISO are both active on the same clock edges? If so, which API calls or register settings should be used instead of SPI_WRITE_READ() to achieve true full-duplex behavior?

    Thank you for your assistance.

  • 0

    Hi Wenkai,

    I have reached out to you directly with a Private Message.
    Please check your inbox.

    Best Regards,
    OV_Renesas

  • 0 in reply to wenkai

    Hi Wenkai,

    Apologies for the delay.
    Could you please clarify if you want the DA16200 in Master or Slave for SPI?

    Best Regards,
    OV_Renesas