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How to set the pps output?

Yan Hongyang
Prodigy 60 points

 I'm using the DK-TM4C129X board PG0 pin as PPS out, but it does not work.

I initialize the program as follow step.

1: enable the LWIP_PTPD in Lwipopts.h.

2: ROM_GPIOPinConfigure(GPIO_PG0_EN0PPS);

3: EMACTimestampPPSSimpleModeSet(EMAC0_BASE, EMAC_PPS_1HZ);

I focus on IEEE-1588 develpoment, when to relsease the ptpd example ?

Thanks for any help you can provide.

 

  • 0
    Guru 117855 points

    Have no experience yet - that board - nor that MCU.  (but 10+ years profitable efforts w/ARM MCUs - many makers)

    While your call to, "ROM_GPIOPinConfigure()" appears necessary - is it sufficient?  Is it not more normal/customary to make calls to, "ROM_GPIOPinType()" & to have properly enabled that host port  (Port G) & your targeted peripheral - as well?   No such evidence reveals - your brief code listing... 

    Usually a fault is generated by failure to enable a peripheral or hosting port - you make no such report.  "I can't get the PPS signal," exceeds famed, "Does not Work!" (always the part's fault - never the user) - but not by much...  "Can't get," is ripe for multiple interpretations - your humble, distant helpers may deserve better care/handling.

    You may wish to configure PG0 as a simple (gpio) output - then toggle & test/observe.  This will at minimum insure that the pin/routing are valid - and enhance your later PPS signal objectives...

  • 0 in reply to cb1_mobile
    Prodigy 60 points

    I'm sorrry fo my bad English!

    I can't find the ROM_GPIOPinType() parameter for PPS configaration.

    I configrued the PG0 as a simple GPIO output, tested the pin is valid.

    Thanks for your attention!

     

  • 0 in reply to Yan Hongyang
    Guru 117855 points

    Yan Hongyang said:

    I can't find the ROM_GPIOPinType() parameter for PPS configaration.

    Never even dawned upon me that could be an issue - one hopes that if a, "GPIOPinConfigure()" exists - the corresponding "GPIOPinType()" does too.  This may require those w/ "inside information" to step in/assist.

    Your English is far better than my French. 

    As last resort - you may benefit from running a, "Find in Files" search w/in your IDE - keying upon PPS and PinType.  Bon chance, mon ami...

  • 0 in reply to cb1_mobile
    TI__Mastermind 18905 points

     

    Yan,

    Wave has all of the proper defines.  For the code example that will be released...uses PH5 for the EN0PPS pin because of placement on the board goes to a breakout header.  The portion that defines/sets PH5 is below, apply similar concept to PG0:

    //*****************************************************************************
    //
    // Pulse Per Second (PPS) Output Pin Definitions.
    //
    //*****************************************************************************
    #define PPS_GPIO_PERIPHERAL     SYSCTL_PERIPH_GPIOH
    #define PPS_GPIO_BASE           GPIO_PORTH_BASE
    #define PPS_GPIO_PIN            GPIO_PIN_5
    #define PPS_PCTL_MASK           0xFFF0FFFF
    #define PPS_PCTL_VAL            0x00050000

        GPIOPadConfigSet(PPS_GPIO_BASE, PPS_GPIO_PIN, GPIO_STRENGTH_2MA,
                         GPIO_PIN_TYPE_STD);
        GPIODirModeSet(PPS_GPIO_BASE, PPS_GPIO_PIN, GPIO_DIR_MODE_HW);
        ulVal = HWREG(PPS_GPIO_BASE + GPIO_O_PCTL);
        ulVal &= PPS_PCTL_MASK;
        ulVal |= PPS_PCTL_WREG(PPS_GPIO_BASE + GPIO_O_PCTL) = ulVal;

    Lela

  • 0 in reply to Lela Garofolo
    Prodigy 60 points

    Thank you for your help very much!

  • 0 in reply to Lela Garofolo
    Guru 117855 points

    Lela Garofolo said:
    Wave has all of the proper defines.

    Seems a bit too, "insider only" for this reporter.   "Wave" may not too heavily "blip" radar of many/most here...

  • 0
    Prodigy 70 points
    HI Yan ,I focus on using DK-TM4C129X board to realize IEEE 1588. Do you have example code?Can you give me ?Thank you so much!!!