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RTOS/TM4C1292NCPDT: SPI Interrupt

sandra george78
Intellectual 980 points
Part Number: TM4C1292NCPDT

Tool/software: TI-RTOS

Hi,

In my code,I want to generate an interrupt when  spi write happens. I am using SPI2 and SPI is in slave mode . For interrupt generation, I did the following,

void AnalogOutputDACISRHandler()

{

uint32_t ui32Status;

 int count=0;

 GPIO_toggle(Board_LED2);       // Given for testing purpose

  if (count <= 100) {

  count ++;

  }

/* Read the interrupt status of the SSI. */

ui32Status = SSIIntStatus(SSI2_BASE, TRUE);

SSIIntClear(SSI2_BASE, ui32Status);

}

And in the function from which interrupt should be generated, I have given

SSIIntRegister(SSI2_BASE, AnalogOutputDACISRHandler);

SSIIntEnable(SSI2_BASE,SSI_TXFF);

 

In spi.h I have seen a function ,

SPI_serviceISR(SPI_Handle handle)

Is this function needed? Where to use this?

 

Is anything else needed to generate SPI interrupt? Please guide me.

 

Thanks & Regards

Sandra

 

  • 0
    Guru 117855 points

    As you note that your MCU is a "slave" to an SPI "master" - would not it prove more robust to have that master "monitor its data received" - and employ that (more complete) event as, "verification of the slave's SPI write?"    (i.e. the slave's transmission - and the wired connection - and the master's reception - are ALL confirmed - via this (more complete) transaction monitor.)

    The method you suggest does not speak to the: success of the reception by the master - which is the (real) objective - is it not?

  • 0 in reply to cb1_mobile
    Intellectual 980 points
    Please tell me how to configure SPI interrupt.
    After getting interrupt I have to post an event and have to do further tasks when this event is pended.
    Please tell me why the function SPI_serviceISR(SPI_Handle handle) is provided in spi.h and how to use this function in code?
  • 0 in reply to sandra george78
    Guru 117855 points

    Your MCU is a "slave" to another - is it not - thus that "master" must receive your slave's transmission.    (I'm repeating here - what was presented earlier - as you've made no response (avoided) the earlier suggestion...)

    It is easiest if you employ a, "Command-Response" style of SPI operation - in which the master makes a request (i.e. command) of the slave - and then "expects" the slave's response.   In high contrast - you (seem) to be seeking a, "Slave driven interrupt" upon the slave's "SPI Write" - (which is clearly known - your slave has generated that write - has it not?) - thus appears w/out value.

    Should you "disagree" w/this (more normal) approach - perhaps your use of the forum's Search Box - aimed specifically at "Slave SPI operation" -may uncover "successful implementations" by other users... I am doubtful that (others) have employed the method you have chosen (and locked onto...)

  • 0 in reply to cb1_mobile
    Intellectual 980 points
    Thank you very much for the response.
  • 0 in reply to sandra george78
    Guru 117855 points

    You and others must note the, "Lack of clear & detailed" code examples - when the MCU is cast as, "SPI Slave." Thus - much (needed) info remains w/in the "belly of the beast" (i.e. vendor) and they (usually) arrive here "late in the day" Sunday (US time) and may be able to supply such "inside, unpublished" (yet needed) detail.

    I've made the effort to read the API & MCU manual - keying on "Slave-specific" implementations - nothing of high value (to your requirement) revealed to me...