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CCS/TMS570LS1224: Using MIBSPI3 pins as GIO

Sofia R.
Prodigy 230 points
Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

Good morning gents,

I've been stuck on this one for a few days and I'd be grateful for any tips.

In my application, I want to use MIBSPI3CLK, MIBSPI3SOMI and MIBSPI3SIMO as a GIO pin. I will not be using any of the MIBSPI3 pins for SPI purposes. 

In Halcogen I have enabled the SPI3 Driver:

and in SPI3 I have selected the following:

I have left MIBSPI3 as it was.

In CCS I have included spi.h in my sys_main.c and I have added the following lines

  /*Bring SPI out of reset.*/
      spiREG3->GCR0 = 1U;       // we don't want the full functionality of SPI, hence why we don't call spiInit()


      gioSetDirection(spiPORT3, 0x000000FF);

And within my while(1) I have

    gioToggleBit(spiPORT3,9);  // CLK
    gioToggleBit(spiPORT3,10); // SIMO
    gioToggleBit(spiPORT3,11); // SOMI

However, this does not work. I am toggling other GIO ports successfully, so I suspect there is something dodgy about the way I have configured SPI3. Any guidance/advice would be greatly appreciated.

Regards,

Sofia

  • 0
    TI__Guru**** 196306 points
    Hello Sofia,

    All of the SPI pins may be programmed via the SPIPCx control registers to be either functional (SPI) or GIO pins. If you want to use SPI_CLK, SPI_SIMO, and SPI_SOMI as GIO pins, please configure the SPIPC0 correctly before using those pins.

    /* SPI3 set CS/CLK/SIMO/SOMI pins to GIO */
    spiREG3->PC0 = (uint32)((uint32)0U << 0U) /* SCS[0] */
    | (uint32)((uint32)0U << 8U) /* ENA */
    | (uint32)((uint32)0U << 9U) /* CLK */
    | (uint32)((uint32)0U << 10U) /* SIMO */
    | (uint32)((uint32)0U << 11U); /* SOMI */
  • 0 in reply to QJ Wang
    Prodigy 230 points

    Hi QJ,

    Thanks for responding, but I am afraid that is already done by Halcogen and it's not working.

    In spi.c I have:

     /* SPI3 set all pins to functional */
    spiREG3->PC0  =   (uint32)((uint32)0U << 0U)  /* SCS[0] */
                    | (uint32)((uint32)0U << 1U)  /* SCS[1] */
                    | (uint32)((uint32)0U << 2U)  /* SCS[2] */
                    | (uint32)((uint32)0U << 3U)  /* SCS[3] */
                    | (uint32)((uint32)0U << 4U)  /* SCS[4] */
                    | (uint32)((uint32)0U << 5U)  /* SCS[5] */
                    | (uint32)((uint32)0U << 8U)  /* ENA */
                    | (uint32)((uint32)0U << 9U)  /* CLK */
                    | (uint32)((uint32)0U << 10U)  /* SIMO */
                    | (uint32)((uint32)0U << 11U); /* SOMI */

  • 0 in reply to Sofia R.
    TI__Guru**** 196306 points
    Hi Sofia,

    Yes, the code is placed in spiInit(), but you didn't call spiInit() in your main().