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TMS570LC4357: How to disable MPU function?

li xy
Intellectual 355 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Hi all:

    How to disable MPU function?  such as write 0 to some registers?

Best Wish

Li

  • 0
    Intellectual 355 points

    One more question, what's the base address of MPU register?

  • 0 in reply to li xy
    TI__Guru**** 192716 points
    li xy said:
    what's the base address of MPU register?

    The MPU registers are not memory mapped. They are read and written through MRC and MRC instructions, for example:

    MRC p15, 0, R1, c1, c0, 0 ; read CP15 register 1
    ORR R1, R1, #0x1
    DSB
    MCR p15, 0, R1, c1, c0, 0 ; enable MPU

  • 0
    TI__Guru**** 192716 points
    li xy said:
    How to disable MPU function? 

    The following code is an example of disabling the MPU:
    MRC p15, 0, R1, c1, c0, 0 ; read CP15 register 1
    BIC R1, R1, #0x1
    DSB
    MCR p15, 0, R1, c1, c0, 0 ; disable MPU
    ISB

    The HALCoGen generates code to configure MPU, enable MPU, or disable MPU:

    _mpuInit_();

    _mpuEnable_();

    _mpuDisable_();

  • 0 in reply to QJ Wang
    Intellectual 355 points

    So I can not access mpu registers through C code?

  • 0 in reply to QJ Wang
    Intellectual 355 points

    Maybe I mess up something. Are there any differences between MPU and NMPU? In my project, it seems like using MPU instead of NMPU

  • 0 in reply to li xy
    TI__Guru**** 192716 points

    You can use c code to call the ARM instructions.

    asm(" MRC p15, 0, R1, c1, c0, 0");     //read CP15 register 1
    asm(" BIC R1, R1, #0x1");
    asm(" DSB");
    asm(" MCR p15, 0, R1, c1, c0, 0);  //disable MPU
    asm(" ISB");

    as I said that you can call "_mpuDisable_();" to disable the MPU.