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TSM320F2812 SCI interruption

rnieluttirnanda
Prodigy 40 points

Other Parts Discussed in Thread: TMS320F28335, CONTROLSUITE, SM320F2812

Hello, I'm working with TMS320F28335 and I need to develop a code in which the interruption is set by the SCI receiver, that is, when the SCI RX receives a package of data (5 bytes), an interruption is set. I'm not using the FIFO. I know that the interruption is set by the RXRDY flag, but how can I service it? Is there a flag that should be cleared after the interruption routine, as when FIFO is employed, or when RXRDY = 0 the interruption is automatically serviced? Do you have code examples of interruption routines for SCI RX? Thank you in advance, Fernanda.

  • 0
    Guru 20075 points

    Hello Fernanda,

    You'll have to use the FIFO If you want the SCI to receive 5 bytes before an interrupt occurs otherwise you will lose data.

    Take a look at

    C:\ti\controlSUITE\device_support\f2833x\v133\DSP2833x_examples_ccsv4\scia_loopback_interrupts  in "Control Suite".

    The acknowledge flag (in PieCtrlRegs) is the only flag that has to be set after the interrupt occurs.

    Stephen

     

  • 0 in reply to stevenh
    Guru 20075 points

    Hello Fernanda,

    I just noticed your not using the TMS320F28335.  I looks like the SCI registers in the TMS320F28335 and your processor are the same.

    I didn't see your processor listed in my control suite directory.

    Stephen

  • 0 in reply to stevenh
    Prodigy 40 points

    Hello Stephen

    I'm using  TMS320F28335, just like I stated in my first post. I've noticed the title of the post thread is "TSM320F2812 SCI interruption", but that was a mistake of mine. Sorry, and thank you for your advice about using the FIFO for generating only one interruption and not losing data.


    Best regards

  • 0 in reply to rnieluttirnanda
    Intellectual 870 points

    Hi

    Here is some sample code that may help u. It  keeps the tx interrupt running until all the data in SBuff is consumed. Actually I use a ring buffer but I have removed in the code to make it simple for u. It is not tested, I just wrote it for u, with slight tweaking it should work.

    Uint16 SBuff [20],UARTTxSize,j;  //Just an example

    //Do this every time u have data to send

    copy 10 bytes to SBuff

    UARTTxSize=10;

    j=0;

    SciaRegs.SCIFFTX.bit.TXFFIENA=1;

    interrupt void sciaTxFifoIsr(void){
        Uint16 i;
        for(i=0; i<4; i++){ //FIFO is 4 bytes deep, adjust to fifo size available on your architecture
           if(UARTTxSize=<0){SciaRegs.SCIFFTX.bit.TXFFIENA=0;break;} //If SBuff empty, disable FIFO Empty Interrupt and stop sending data.
            SciaRegs.SCITXBUF=SBuff[j++];     // Send data

            UARTTxSize--;
        }
        SciaRegs.SCIFFTX.bit.TXFFINTCLR=1;    // Clear SCI Interrupt flag
        PieCtrlRegs.PIEACK.all|=0x100;      // Issue PIE ACK
    }