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Configuration of MPU on RM48

Vaclav Cechticky
Intellectual 560 points
Other Parts Discussed in Thread: HALCOGEN

Hello,

I'm having difficulties to configure MPU on RM48L950AZWT HDK. I enabled and configured the regions 2 and 3 (Flash and RAM), and then I also enabled MPU in general settings. I made it in HalCoGen 3.00.01, finally I generated code and integrated it into a project. I inserted _mpuInit()_ and _mpuEnable()_ in sys_startup.c just before main() is called.

My code gets restarted inside the main() function without any obvious reason. I checked the SYSESR register bit 0 after I called _mpuInit()_ and _mpuEnable()_, in the debug mode and I see that this bit is set to zero. This would mean MPU is disabled. On the other hand, it makes significant difference to have _mpuInit()_ and _mpuEnable()_ in code. When I remove them, the application is running as expected.

Does anybody has an experience with this issue?

Thanks

 Vaclav

  • 0
    TI__Mastermind 19210 points

    Hello Vaclav,

    When an address is issued that does not fall into any region, it generates an abort. If you have regions for only Flash and RAM, you should generate an abort if you try to access any peripheral space (or any access outside of what you have specified as MPU regions).

    It might make sense

    (1) to see if an abort is generated

    and/or

    (2) to add a background region for the MPU.

    Regards,

    Kevin Lavery