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xdc.runtime.Timestamp which timer is used by default?

Ian Cole (old profile)
Intellectual 260 points
Other Parts Discussed in Thread: SYSBIOS

Hi,

according to the sys/bios help - xdc.runtime.TimestampNull will be used if this line is added to the cfg file:

var Timestamp = xdc.useModule('xdc.runtime.Timestamp');

Although the docs state that this will always return 0 for a call to 

Timestamp_get32// Return a 32-bit timestamp()
It actually seems to return valid values. My question is - for a C6670 which of the dsp timers is being used?
And is a valid xdc.runtime.ITimestampClient provided by default?
bios 6.32.04.49
xdctools 3.22.01.21
Thanks
  • 0
    TI__Mastermind 30830 points

    It seems that the SYS/BIOS help is incorrect. Can you show me this reference?

    When a NON SYS/BIOS project is built, I believe that TimestampNull will be used.

    When SYS/BIOS is brought into a project with this line in the user's config script:

        var BIOS = xdc.useModule('ti.sysbios.BIOS');

    SYS/BIOS wires up an appropriate TimestampProvider delegate for the xdc.runtime.Timestamp module.

    In the C6670 case, the TimestampProvider delegate is

        ti.sysbios.family.c64p.TimestampProvider

    This TimestampProvider uses the C64+ core's internal 64 bit TSCH/TSCL counter as the timestamp source.

    Alan

  • 0
    TI__Expert 4125 points

    Ian,

    Most current C6x devices use the Timestamp Counter registers built into the C6x core for this service and not one of the timers. This is a free-running counter that can be accessed via the TSCL and TSCH registers.

    You can find the specific software package for your device via the documentation in the ti.sysbios.family package:

    http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/sysbios/6_32_04_49/exports/bios_6_32_04_49/docs/cdoc/index.html#ti/sysbios/family/package.html

    Click on the SYS/BIOS Delegates Usage link and then find your device. You will see the specific HW interrupt (Hwi), Cache, Timer and Timestamp modules named. In this case, it is ti.sysbios.family.c64p.TimestampProvider . You can find the source code for this in the <sysbios_install_dir>/packages/ti/sysbios/family/c64p directory.

    Mark

  • 0 in reply to MarkGrosen
    Intellectual 260 points

    Thanks Mark.

    I eventually found the timestamp module for c64p and guessed this was being used. Stepping through the code confirmed this.

    As for the docs - I was looking at the bios6.chm : 

    SYS/BIOS 6.32.04.49 GA Release Notes

    Section was module xdc.runtime.Timestamp:

    This module provides xdc.runtime.ITimestampClient APIs for the xdc Runtime Support Library. Calls to these APIs are forwarded to a platform specific xdc.runtime.ITimestampProvider implementation.
    A user can attach their own ITimestampProvider module using the following config file command:
      xdc.runtime.Timestamp.SupportProxy = xdc.useModule("usersTimestampProvider");
    If no such SupportProxy initialization is done, the xdc.runtime.TimestampNull ITimestampProvider implementation, which provides null stubs for the APIs, will be attached by default.
    I f this was a doc in the xdctools area - I could understand the above statement. But not in sys/bios documentation.
    Thanks all. And seasons greetings :)