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Thread: ASCLIN interruption inside timer interruption problem

  1. #1
    Intermediate Intermediate Lukas_G is on a distinguished road
    Join Date
    Apr 2019

    ASCLIN interruption inside timer interruption problem


    I,m currently developing project on tc22x. I'm using following modules that uses interruptions :
    - gtm_tom timer
    - asclin1_spi
    Only hardware interrupts are used.

    spi has 3 interrupts: tx, rx, error, with priorities 1, 2, 3
    timer has one interrupt with priority 10

    Spi, placed in main() loop ,works good.
    When i place it in the timmer interrupt it stop working,

    bit is constantly set to true
    and spi do not send/receive anything

    I'm enabling interrupts every time the timer interruption execute.

    I also use multican module that does not use any interrupts and it works fine in timer interrupt, so I think it's the interruption configuration problem.

    why such situation happens despite higher Spi interrupts priorities ?

  2. #2
    Advanced Advanced
    Infineon Employee
    Infineon Employee
    MoD is on a distinguished road
    Join Date
    Feb 2012
    As long as the timer interrupt has a higher priority than the spi interrupts are the spi interrupts ignored until the timer interrupt is exited. After enabling the interrupts in the timer interrupt only interrupts with higher priority than 10 can interrupt the timer interrupt.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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