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TMS320F28335: SYS/BIOS: How to use SCI without HWI

stevenh
Guru 20035 points
Part Number: TMS320F28335

Hello, 

I am porting over a SCI driver and protocol handler to a SYS/BIOS project.  

Do I need to configure a HWI for the SCI interrupts? Or can I just use my existing driver to set up the interrupts and ISRs.

Here's how I configure the interrupts and ISR

      case SCIB_UART_PORT:         
            PieVectTable.SCITXINTB = (PINT)&SCIB_FIFOTxBufferEmpty_isr;
            PieVectTable.SCIRXINTB = (PINT)&SCIB_FIFORxBufferFull_isr;
            PieCtrlRegs.PIEIER9.bit.INTx3 = 1; 
            PieCtrlRegs.PIEIER9.bit.INTx4 = 1;                             
            IER |= M_INT9;         
            break;

        will any of these be overwritten by SYS/BIOS?

        If doing it this way is an issue, could you please show me the steps to set up an HWI?  See below. Did I set them up correctly?

        What else do I need to do?


       Stephen

       

       

  • 0
    TI__Guru 53195 points

    I'd recommend using a Hwi, especially if you want to be able to call SYS/BIOS functions from inside the ISR. Your Hwi setup looks fine. Make sure to remove the code that writes to PieVectTable from your application. SYS/BIOS is going to fill the vector table with its Hwi dispatcher which will call the ISR function, so writing to PieVectTable yourself with overwrite the SYS/BIOS configuration which can cause scheduler issues.

    This post has some nice information about using SYS/BIOS on the C28x including quite a bit on Hwis:

    [FAQ] Are there any C28 device specific items with TI-RTOS (SYS/BIOS)? - C2000 microcontrollers forum...

    e2e.ti.com
    Other Parts Discussed in Thread: TMS320F28069 , TMS320C28346 , SYSBIOS Can you explain any C28 device specific items within the TI-RTOS kernel? Note: SYS/BIOS

    Whitney

  • 0 in reply to Whitney Dewey
    Guru 20035 points

    Hello whitney,

    thanks.

    Do I still ack the PIE (e.g.   PieCtrlRegs.PIEACK.all |= PIEACK_GROUP8; // Must acknowledge the PIE group)  at the end of the ISR or does sys/bios do that?

    Stephen

  • 0 in reply to Whitney Dewey
    Guru 20035 points

    Also, will sys/bios do all the following:

          PieVectTable.SCITXINTB = (PINT)&SCIB_FIFOTxBufferEmpty_isr;
      PieVectTable.SCIRXINTB = (PINT)&SCIB_FIFORxBufferFull_isr;
      PieCtrlRegs.PIEIER9.bit.INTx3 = 1; 
      PieCtrlRegs.PIEIER9.bit.INTx4 = 1;                             
      IER |= M_INT9;

  • 0 in reply to stevenh
    TI__Guru 53195 points

    Yes, by default, SYS/BIOS will perform the ACK, configure the PIE vector table, and enable the interrupts in both the PIE and the CPU (IER).

    If you don't want SYS/BIOS to automatically do the enable, you can uncheck that "Enable at startup" box and then use the Hwi_enablePIEIER and Hwi_enableIER functions to enable it later in the application.

    Whitney