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DM642 to DM647 Timer question

Peter40529
Intellectual 270 points

Hi all,

I've been migrating some old DM642 CSL based code to a DM647.  I use to use the TIMER_ which were available in the csl_timer header.  I've been poking around through the PSP modules and samples, and so far I can only find CSLR calls to access the DM647 timer.  Is there a high-level API for the timer?  If not what's the best wat to replace the functionality of the TIMER_getCount() call?

Thanks,

Peter

 

  • 0
    TI__Genius 16906 points

    Peter,

    I'll look into the PSP and let you know what is available.

    Regards,

    Brad

  • 0 in reply to B.C.
    TI__Intellectual 1135 points

    Hi Peter

    For DM647/8 only CSLR support was provided and the high level CSL APIs are not available. The user may have to implement his own TIMER_getCount() function using CSLR.

    Regards,

    Vichu

  • 0 in reply to Visuvanadan Pasupathy
    Intellectual 270 points

    Thanks Brad and Vichu.

    I believe I have the timer initialized (my code is based on the timer sample application), but I don't know which register to probe for the time.  Could you give me a push in the right direction?

    Thanks,

    Peter

     

  • 0 in reply to Peter40529
    TI__Genius 16906 points

    Peter,

    Please refer to Section 2.3 of the 64-Bit Timer user guide (spruel0) for details on how the count values are stored in the registers.

    Regards,

    Brad

  • 0
    Expert 1575 points

    Hi Peter,

    one possibility to access the timer registers on DM647/648 is to use the cslr - Headers of pspdrivers:

    #include <ti/sdo/pspdrivers/soc/dm648/dsp/soc.h>
    #include <ti/sdo/pspdrivers/soc/dm648/dsp/cslr.h>
    #include <ti/sdo/pspdrivers/soc/dm648/dsp/cslr_tmr.h>

    CSL_TmrRegsOvly tmr0Regs = (CSL_TmrRegsOvly)CSL_TMR_0_REGS;
    cnt = tmr0Regs->TIM12;

    do you use DSP BIOS? if yes, the DSP BIOS api should be an option:

    #include <std.h>
    #include <hwi.h>
    #include <clk.h>

    cnt = CLK_gethtime();
    tick = CLK_getltime();

    maybe this thread is interesting for you:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/99/p/6332/23876.aspx#23876

    bye,

    Thomas

  • 0 in reply to Thomas9070
    Intellectual 270 points

    Thanks a lot for the help.  I'll try out the CLK calls first to see if they are a good replacement or not, and then drop down to the CSLR level only if necessary.

     

    Peter

     

  • 0 in reply to Thomas9070
    Intellectual 270 points

    Unfortunately I do not have a DM642 available to test the old code on.  Do you have any idea what the difference should be between calling the old CSL TIMER_getCount() and the BIOS CLK_gethtime()?  The CSL documentation is a little vague, but it does sound like they're suppose to do the same thing.  Is that correct?

    Thanks,

    Peter

  • 0 in reply to Peter40529
    Expert 1575 points

    Hi Peter,

    as far as I know CSL is no longer available on DM648. Using the BIOS api works on both processors (DM642/648). The alternative to BIOS on DM648 is CSLR (not API functions but access to registers) which works like

    CSL_TmrRegsOvly tmr0Regs = (CSL_TmrRegsOvly)CSL_TMR_0_REGS;
    cnt = tmr0Regs->TIM12;