Getting Sys/Bios Clock Period

Jan Stefan

Intellectual 275 points

Other Parts Discussed in Thread: SYSBIOS

Sys/Bios 6.31.0.18

Microprocessor 28335

I use the XGCONF IDE editor to include the Clock module

var Clock = xdc.useModule('ti.sysbios.knl.Clock');

I create an instance HandPieceMgrClock

      var instClock1Params0 = new Clock.Params();
      instClock1Params0.period = 10;
      instClock1Params0.startFlag = true;
      Program.global.HandPieceMgrClock = Clock.create("&gHandPieceMgrClock", 1000, instClock1Params0);

From within the program, I want to read the clock period for that clock instance, to use in future calculations. There seems to be no Sys/Bios access function to retrieve the period. There is a Clock_getTimeout() call, but that is not the field I want.

I could cast the Clock Handle to an Uint32 *, add four, and take the contents, but that seems slightly heavy handed.

Is there a better way to retrieve the clock period set in the Editor?

Thanks,

Jan

over 14 years ago

0 Jan Stefan over 14 years ago

Intellectual 275 points

Jan Stefan said:
Is there a better way to retrieve the clock period set in the Editor?

I think I found a poor way, but a little better than casting to a Uint32.

I added the following at the top of the module:

      // the define is needed to access struct ti_sysbios_knl_Clock_Object definition
      #define ti_sysbios_knl_Clock__internalaccess
      #include <ti/sysbios/knl/Clock.h>

Then added to a class constructor :

      struct ti_sysbios_knl_Clock_Object * ptr =
      reinterpret_cast<struct ti_sysbios_knl_Clock_Object *>(HandPieceMgrClock);
      TimerTickPeriodMs = ptr->period;

If you have a better way that does not involve cheating the include, Let me know.

Thanks,

Jan

0 Karl Wechsler over 14 years ago in reply to Jan Stefan

TI__Mastermind 20805 points

I have no good explaination for why we don't have a Clock_getPeriod() API.

What you suggest as your 2nd idea is probably the best for now.

I filed a CQ asking to add this API -- SDOCM00080205.

0 Jan Stefan over 14 years ago in reply to Karl Wechsler

Intellectual 275 points

Thanks for the quick reply and the submission!!

Jan

0 Ed Hopkins over 12 years ago in reply to Karl Wechsler

Prodigy 30 points

Just wondering if there were any follow-ups to this ... was thinking the same thing, why not a get period API call in addition to getTicks()?

0 ScottG over 12 years ago in reply to Ed Hopkins

TI__Mastermind 26780 points

Ed,

This was implemented in the SYS/BIOS 6.32.00.20 release. If you update to a later release you’ll see the new Clock_getPeriod() API.

Scott

0 Ed Hopkins over 12 years ago in reply to ScottG

Prodigy 30 points

Is there another include to reference? We are using 6.32.5.54 but I got an error using this function (is expecting to be passed a parameter I think to the handle like the Clock object function of the same name. What would be the handle of the default Bios Kernel tick?

0 ScottG over 12 years ago in reply to Ed Hopkins

TI__Mastermind 26780 points

If you want the Clock *module* tick period use this: Clock_getTickPeriod()

Clock_getPeriod() is for retrieving the period of a particular Clock *object instance*. It’s argument is the Clock_Handle of the instance.

Scott

0 Ed Hopkins over 12 years ago in reply to ScottG

Prodigy 30 points

Aha, thanks Scott, thats what we were looking for.

0 ScottG over 12 years ago in reply to Ed Hopkins

TI__Mastermind 26780 points

Ed,

Sorry, I just realized I may have steered you wrong with my previous reply.

The units of the period reported by Clock_getTickPeriod() is in timer register *counts*, of the underlying timer that is generating the ticks for the Clock module.

I’m thinking you really want the overall Clock tick period in *microseconds*, as configured for the application. Is that correct?

Thanks,
Scott

0 ScottG over 12 years ago in reply to ScottG

TI__Mastermind 26780 points

I just double checked to be sure before replying again… if you want to know the Clock module’s tick period in *microseconds*… there is no API to query this. And to save footprint, the module tick rate is not stored in memory on the target.

If you include Clock.h in your C file, you can access this microsecond value via "ti_sysbios_knl_Clock_tickPeriod". Try something like this:

    UInt clockTickPeriod;
    …
    clockTickPeriod = ti_sysbios_knl_Clock_tickPeriod;

0 Qiuyang Wang over 11 years ago in reply to Karl Wechsler

Prodigy 20 points

I have got another problem related to this which lead me here.

I was trying to change the timeout and period of my clock object within the program using the Clock_setTimeout() and Clock_setPeriod() API. The number that API could take is a Uint16 while actual field in the object structure is a Uint32. This bothered me a lot. Does anybody know how could I do to set the period time to a Uint32 number?

Tanks！

0 Emmanuel Trinidad - Alicea over 11 years ago in reply to Qiuyang Wang

TI__Genius 10260 points

Hi Qiuyang,

What version of SYS/BIOS are you currently using? The setPeriod and setTimeout APIs in SYS/BIOS 6.37.00.20 (latest release) use UInt32 types.

Thanks,

Emmanuel

0 Qiuyang Wang over 11 years ago in reply to Emmanuel Trinidad - Alicea

Prodigy 20 points

Hi Emmanuel,

I am using the old version which is 6_34. I'll go get the latest one.

Thank you very much for your help and quick respond!

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Getting Sys/Bios Clock Period