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Simple question about PRD in DSP/BIOS

Ti Eval
Intellectual 340 points

Hi,

I still play around with my OMAP L 137 board from Spectrum Digital. Today I intended to test the PRD (periodic function) feature of DSP/BIOS.

I used the DSP editor to setup a PRD object called PRD0 in the hello-world example which is part of DSP/BIOS example directory. Then I changed the period of the PRD object to 1000 ticks, added a functionname "_myPDR" as the function argument (the callback, as described here: http://www.tij.co.jp/jp/lit/an/spra829/spra829.pdf). Finally, I added a function called "Void myPDR(Void)" in the main.c file.

Compiling worked fine, loading of the executable worked fine. I also setup a breakpoint in the "myPDR" function. Then starting: Nothing happens. Should not the function myPDR be called periodically (1000 ticks = 1 sec)? Or do I have to add some code in the main function to get this working?

Thank you, best regards,

 

HT

  • 0
    Intellectual 340 points

    Hi,

    I solved my problem. Once adding a PRD-object in the DSP/BIOS configuration, the timer does not start automatically. I do not see any SWI callbacks being called.

    I started entering the clock Manager properties dialog and clicked around without understanding what I did. However, I added the checkbox for "Reset Timer and TIMMODE". This helped, now my callback is being called as expected.

    Maybe you guys at TI should put a comment into the documentation. So far, every feature of DSP/BIOS that I tried to use required "any kind of trick" to operate as described in the documentation!

     

    Best regards,

     

    HT

  • 0 in reply to Ti Eval
    TI__Mastermind 45025 points

    Hi HT,

    Which version of BIOS are you using? I'd like to check what you have against the latest and see if the docs have been updated.

    Thanks,

    Steve

  • 0 in reply to Steven Connell
    Intellectual 340 points

    Hi Steve,

    I have used 5.33.01 and 5.33.06. DSP Bios 5.33.01 came with my CCS installation version 3.3 and I installed the newer version lateron.

     

    Best regards,

     

    HT