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Thread: XMC4500: Usage of the core coupled memory (CCM)

  1. #1
    New Member New Member SN74HC00 is on a distinguished road
    Join Date
    Jul 2019

    XMC4500: Usage of the core coupled memory (CCM)


    to improve the performance of my application on a
    XMC4500F100K1024AC, I tried to use the CCM but I
    did't find any hints in the web.

    In the STM32F4xx-world they use a special variable
    declaration to place them into the CCM.

    So I started to declare my variables step by step
    in this way, e. g.:

    static float xyz __attribute__((section(".ccmram")));

    DAVE's compiler/linker passed without trouble
    and there was an ascertainable gain of performance.

    But if I exceed a certain number of variables declared
    in this way, the application suddenly crashes.

    Does the CCM have to be specially initialized or
    are other preparations required?

    Best regards

  2. #2

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
    Join Date
    Oct 2012

    Have a look to the linker file, you need to use the following attribute:
    /* functions with __attribute__((section(".ram_code"))) */

    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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