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Original question:

TMS320F28P550SJ: What happens if the user sets TBCLKSYNC while EPWM counters are running and TBCLKSYNC has been already set...

TMS320F28P550SJ: What happens if the user set CPU_SYS_REGS.PCLKCRx bits again during runtime when they are already set?

Wayne Huang
Genius 17155 points

Part Number: TMS320F28P550SJ
Other Parts Discussed in Thread: C2000WARE

Hi champs,

 

I am asking this for our customer.

If CPU_SYS_REGS.PCLKCRx bits have been set and then the user set them again during runtime, is there any negative effect? 

Or it will do nothing?

 

  • 0
    TI__Mastermind 20695 points

    Hi Wayne,

    Which CPU_SYS_REGS.PCLKCRx are you specifically referring to? Even with PCLKCR0.TBCLKSYNC, writing 1 to any of the other registers when already set to 1 should be okay, though I do not see why that is needed. I tried this on my setup and don't see any issues, but I still wouldn't recommend this unnecessary write. 

    In general, 

    Best Regards,

    Aishwarya

  • 0 in reply to Aishwarya Rajesh
    TI__Genius 17155 points

    Hi Aishwarya,

    In fact, I meant not only TBCLKSYNC but also all other bits for clocking.

    What happens if these bits (clocking) have been already enabled, and then user set them again in the codes. 

    Will this impact the modules which are running?

    The user hopes these unnecessary writes do not affect anything.

    This is used for some special cases and code modularization.

  • +1
    TI__Mastermind 20695 points

    Wayne,

    Yes, there should be no effect as mentioned before because you are just writing a 1 to a register that is already set to logic high.

    Best Regards,

    Aishwarya

  • 0 in reply to Aishwarya Rajesh
    TI__Genius 17155 points

    Hi Aishwarya,

    Thank you.

    In fact, just realize that our examples show in this way.

    For example, 

    C:\ti\c2000\C2000Ware_6_00_01_00\driverlib\f28p55x\examples\led

    The peripherals clocks (CPU_SYS_REGS.PCLKCRx) are enabled the first time in 

    Device_init();
    And for the second time in 
    Board_init();