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Setting up interrupts using DSP/BIOS on a c5502

Robert Bradshaw
Prodigy 110 points
Hi,
 
I am trying to setup up interrupts on the c5502 using DSP bios.  I open the .tcf editor and select HWI_INT17 and open the properties.  I see the defalult ISR of HWI_unused.  I put in the label I want which is HWI_pcmTxIRQ.  I then go and create the function in a .c in my project. 
 
However, two problems.  I do not know the format for the prototype of the ISR fucntion, and I do not know what if any pragram is require in the function.  I have the document spru423h and it tells me to refference the "TMS320 DSP/BIOS API Reference Guide" for your part (top of page 4-12).  Anyone have any suggestions for me?
 
Thanks,
 
Robert
  • 0
    TI__Genius 13045 points

    Robert,

    The document you are reading has a good overview of how the HWI function works in DSP/BIOS.  The API document can be found here: http://www-s.ti.com/sc/techlit/spru404.  I'll look and see if I can find some example code that uses HWI.  It doesn't appear that the examples that come with BIOS uses this feature from what I can see.

    Regards.

  • 0 in reply to TommyG
    TI__Genius 13045 points

    Robert,

    I was able to get your project to build by modifying the function name from HWI_pcmTxIRQ to _HWI_pcmTxIRQ using the configuration tool.  This is the preferred method of managing interrupts with DSP BIOS.  Also, DSP BIOS takes care of context switch for you, so you don't need to worry about that. 

    Another thing is that with an ISR you can't pass parameters to the function, so you need to change the prototype from
          void HWI_pcmTxIRQ(Uint32 param)
    to 
     void HWI_pcmTxIRQ(void)
    If you need to pass information to the ISR, then you need to make the parameter a global variable so that the ISR can access it.

    Regards.

  • 0 in reply to TommyG
    Prodigy 130 points

    Hi Tommy,

    I have followed a similar procedure to configure the UART interrupt for C5515, with DSP/BIOS.

    I am using the "IRQ_..." APIs , which are used in the C55xx_CSL example code under "<TI_INSTALL>\ccs_v4.0_examples\uart\CSL_UART_IntExample".
    (which works well without DSP/BIOS)

    Can  the "IRQ_..." APIs be used even with DSP_BIOS ? or shoud we use the APIs which are part of the HWI Module specified in the DSP_BIOS API documentation ?

    Is there any  example code which shows configuring/handling interrupts with DSP/BIOS ?

    Thanks & Regards
    Ullas

  • 0 in reply to Ullas R
    TI__Genius 13045 points

    Ullas,

    When you use DSP/BIOS for HWI management you shouldn't need to use CSL.  I believe you will only need to setup your interrupt mask register in your code to activate the interrupts you want to use in your system.  The BIOS scheduler should handle context save and restore when running your ISR. 

    To double check to make sure I haven't missed anything you should consider posting this to the BIOS Forum as well.  You can find it here: http://e2e.ti.com/support/embedded/f/355.aspx.  They may be able to help with sample code because I can't find anything on HWI for recent versions of BIOS.

    Regards.