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MSP432P401R SPI questions

Tao Zhang
Expert 4155 points

I have a few SPI TI-RTOS driver/hardware related questions on MSP432P401R:

 

1. SPI_CS signal on boosterPack header J2

The schematics from MSP432P401R LaunchPad Development Kit documents shows that SPI_CS from J2 (P3.0_IO_J2.18) is connected to  P3.0/PM_UCA2STE, however other SPI signals on J2 are from UCB0(UCB0SIMO, UCB0SOMI)

It seems SPI_CS is not from the same SPI IP as other SPI signals. Is this correct?

 

2. Does SPI TI_RTOS driver supports SPI 4-wire option with CS? How to configure it?

3. Does SPI TI_RTOS driver provides timing configuration such as chipSelect-to-transmission delay or clock cycles between CS toggling?

Thanks,

Tao

  • 0
    TI__Guru 56685 points
    Tao,

    We will look into this and get back to you.

    For your first question though, my initial guess is that SPI_CS is being used just as a GPIO and not part of the SPI module itself. This was most likely done in order to conform to the Launchpad Standard.
  • 0
    TI__Mastermind 25045 points

    Hi Tao,

    Tao Zhang said:
    It seems SPI_CS is not from the same SPI IP as other SPI signals. Is this correct?

    Yes that is correct.

    Tao Zhang said:
    Does SPI TI_RTOS driver supports SPI 4-wire option with CS? How to configure it?

    No it does not. Please take a look at TI-RTOS 2.20 User's Guide - Texas Instruments section 5.11.7 Master/Slave Modes "Asserting on Chip Select".

    Regards,

    David

  • 0 in reply to DavidL
    TI__Expert 5805 points

    Hi David,


    I have a similar inquiry to Tao's. If the SPI_CS is not a SPI IP signal, does that mean that the lack of 4-wire support is a board design issue and not just a TI_RTOS driver issue?

    Is it possible to update TI_RTOS SPI driver  to support 4-wire (see SPI parameters below) by adding the fields into the structure below? Who may we contact in the TI RTOS team to discuss this?

    Kind regards,

    Javier

    /*!
     *  @brief SPI Parameters
     *
     *  SPI Parameters are used to with the SPI_open() call. Default values for
     *  these parameters are set using SPI_Params_init().
     *
     *  @sa         SPI_Params_init()
     */
    typedef struct SPI_Params {
        SPI_TransferMode    transferMode;       /*!< Blocking or Callback mode */
        uint32_t            transferTimeout;    /*!< Transfer timeout in system
                                                     ticks (Not supported with all
                                                     implementations */
        SPI_CallbackFxn     transferCallbackFxn;/*!< Callback function pointer */
        SPI_Mode            mode;               /*!< Master or Slave mode */
        uint32_t            bitRate;            /*!< SPI bit rate in Hz */
        uint32_t            dataSize;           /*!< SPI data frame size in bits */
        SPI_FrameFormat     frameFormat;        /*!< SPI frame format */
        uintptr_t           custom;             /*!< Custom argument used by driver
                                                     implementation */
    } SPI_Params;

  • 0 in reply to Javier Malave-Bonet
    TI__Guru 57846 points
    Javier,
    If you not have already, then I would recommend making this recommendation within the TI-RTOS forum. I will submit a request from my side as well.

    Chris
  • 0 in reply to Chris Sterzik
    TI__Expert 5805 points

    Hi Chris,


    Could you forward me the link? Thanks.


    Kind regards,

    Javier

  • 0 in reply to Javier Malave-Bonet
    TI__Guru 57846 points
    Javier,
    The TI-RTOS forum can be found here:

    e2e.ti.com/.../355

    Regards,
    Chris

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