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RTOS/PROCESSOR-SDK-AM57X: PPS usage example from PRU-ICSS PTP driver in SDK 05.01.00.11

Alex Overchenko
Intellectual 895 points
Part Number: PROCESSOR-SDK-AM57X

Tool/software: TI-RTOS

Hello. I'm using AM572x IDK board and want to use PPS synchronization with PTP on PRU-ICSS. As I found in SDK, timeSync API supports PPS and PTP sync together, but the timeSync example does not demonstrate PPS usage.

Tell me, please, answers on that questions:

1) How do I need to configure interrupts on A15 0 core to see working PPS interrupts & synchronization on A15 0 core?

2) What PRU-ICSS host interrupt is used to synchronize PPS & PTP? As I see, PPS interrupt handler is located in timeSync_example_osal.c file.

P.S. I'm using Ubuntu 16.04.5 LTS x64, TI-RTOS SDK v05.01.00.11, CCS v8.1.0

  • 0
    TI__Guru** 116170 points
    Alex,

    Sorry for the delay in getting to this post. We have reached out to the PTP driver experts with your questions and will get back to you when we receive a response to help you with this issue.

    Regards,
    Rahul
  • 0
    TI__Mastermind 39340 points
    Hi Alex, some comments below

    1) Are you referring to TimeSync_latchSyncTask(), TimeSync_latchIsr()?
    2) Probably what you are looking for is:
    - timeSync_example_crossbarConfig() -> configures Rx ISR, Link ISR, PTP ISR, TX ISR
    - timeSync_example_configureInterrupts() -> configures RX, Link, TX int numbers

    Are you trying to synchronize with a GM? could you explain us better your use case and the test you are trying to achieve?.

    thank you,
    Paula
  • 0 in reply to Paula Carrillo
    Intellectual 895 points
    Hi Paula, sorry for the long time answer.

    I need this feature to a custom handle of captured PTP values (2-3 seconds period). I implement my feature, based on your PPS implementation. But also I need to reconfigure PRU registers (manual interrupt connection inside PRU) to get PRU captured value.

    I implemented that algorithm (tested on PRU2.0 only):
    * disable falling edge interrupts for latch0
    * set async mode for latch0
    * map PRU INTC Channel 9 to HOST7 interrupt
    * map PRU INTC Sys_event 12 interrupt to Channel 9
    * manual clear system interrupt 12 status flag
    * manual clear captured values
    * enable PRU INTC Sys_event 12 interrupt
    * enable PRU INTC HOST 7 interrupt
    That config was updated manually in registers.
    And I configure timer capture ISR (CSL_XBAR_INST_MPU_IRQ_136 - for example) to CSL_XBAR_PRUSS1_IRQ_HOST7 - that was Xbar (crossbar) configuration.
    Then in TimeSync_isrAndTaskInit (..._osal.c in Ti examples) I manually enable all PPS sections, call my PRU & interrupt configuration patches and implement required handling that ISR in TimeSync_latchSyncTask

    I hope my answer will be useful for others.

    Regards,
    Alex

    P.S. TI, please, add an example of using PPS from timeSync module
  • 0 in reply to Alex Overchenko
    TI__Mastermind 39340 points

    Hi Alex, thanks a lot for your detailed answer. I will raise internally your petition of a PPS + TimeSync module example.

    thank you,

    Paula