• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 287 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TIDEP-01032: Using Motor with HDSL SYNC

TIDEP-01032: HDSL Safe Position Interrupt

Alan Ismail
Intellectual 415 points
Part Number: TIDEP-01032


Tool/software:

Dear Ti Experts

Which interrupt should I use to get data Safe Position Data in V-Frame. Is this interrupt  triggered exclusively for Safe Position Update.

Thank you

Alan I

  • 0
    TI__Prodigy 360 points

    Hi Alan,

    For Safe Position Data (VPOS), PRU0_ARM_IRQ1 is the interrupt associated with it. Also, please refer below info for the interrupt mapping:
    PRU0_ARM_IRQ4: EVENT_S

    PRU0_ARM_IRQ3/5: H-Frame

    PRU0_ARM_IRQ2: VPOS2 (Safe Position 2)

    PRU0_ARM_IRQ1: VPOS (Safe Position)

    PRU0_ARM_IRQ: EVENT_L 

    Let me know if you have any further questions.

    Best Regards,

    Rajul

  • 0 in reply to Rajul Bhambay
    Intellectual 415 points

    Thank you for the reply

    I am running SYNC MODE , ES=4

    SYNC Period = 18750

    Sync Calculation is giving the following

    ********************************************************************
    SYNC MODE: period = 18751
    SYNC MODE: ES = 4
    SYNC MODE: counter = 269
    SYNC MODE: wait_before_start = 9349
    SYNC MODE: bottom_up_cycles = 18748
    SYNC MODE: extra_size = 5
    SYNC MODE: temp_gRest = 7
    SYNC MODE: extra_edge = 254
    SYNC MODE: num_of_stuffing = 5
    SYNC MODE: extra_size_remainder = 1
    SYNC MODE: stuffing_remainder = 2
    ********************************************************************

    1) SYNC MODE period is :18751  instead of 18750

    And the VPOS2 interrupt is drifting against reference interrupt with period of 18750.

    2) Changed the setting to 

    ES=4 

    SYNC Period = 18749

    ********************************************************************
    SYNC MODE: period = 18750
    SYNC MODE: ES = 4
    SYNC MODE: counter = 278
    SYNC MODE: wait_before_start = 9349
    SYNC MODE: bottom_up_cycles = 18748
    SYNC MODE: extra_size = 5
    SYNC MODE: temp_gRest = 7
    SYNC MODE: extra_edge = 254
    SYNC MODE: num_of_stuffing = 5
    SYNC MODE: extra_size_remainder = 1
    SYNC MODE: stuffing_remainder = 2
    ********************************************************************

    VPOS2 interrupt seems more stable against reference interrupt

    Is this expected?

    Alan I

  • 0 in reply to Alan Ismail
    TI__Mastermind 28184 points

    Hi

    How are you giving SYNC pulse here? Are you using SDK example only?


    Alan Ismail said:

    And the VPOS2 interrupt is drifting against reference interrupt with period of 18750.

    What do you mean by reference interrupt here?

    Regards

    Dhaval

  • 0 in reply to Alan Ismail
    TI__Prodigy 360 points


    Hi Alan,

    These are the calculations explained for sync mode for ES=1 and PRU frequency =225MHz. While capturing period of sync, there is 1 cycle latching error expected when taking sync input from internal IEP pulse. Have you tried SYNC Mode with providing external Sync pulse? 

    Best Regards,

    Rajul