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    BMA400 generic interrupt logical combination

    BMA400 generic interrupt logical combination

    dsherman
    Member
    Is the BMA400 datasheet wrong about the GEN1 / GEN2 logical combination bit?
     
    When I experiment with the BMA400 shuttle board and Development Desktop 2.0, I find these inconsistencies:
     
    Register 0x40, page 86, and 0x4B, page 92
    gen1/2_comb_sel:
    0x00 = logical OR    << in reality, 0x00 requires ALL enabled axes to comply (logical AND/all)
    0x00 = logical AND  << in reality, 0x01 requires AT LEAST ONE of the enabled axes to comply (logical OR/any)
     
    Can anyone confirm this?
     
     
    5 REPLIES 5

    BSTRobin
    Community Moderator
    Community Moderator

    Hello dsherman,

    There were example configuration for your reference.You could try it.

    Interrupt threshold reference X/Y/Z: ignored since reference update mode is selected for every time.

    GEN1 for any motion:

    GEN 1 for any-motion.png

    GEN2 for no motion:

    GEN 2 for no-motion.png

     

    "Every time" mode seems fine. 

    I am using "manual" and "one time" modes.  You try it and tell me what you see.

    dsherman_0-1632941148479.png

    "All Axes" : interrupt fires if X or Y is close to 0.

    "Any Axes" :  interrupt fires if X and Y are both close to 0.  

    These are backwards.

    BSTRobin
    Community Moderator
    Community Moderator

    Hello dsherman,

    What functions does your product need?

    "My product" is irrelevant.  I have identified a problem with "your product". 

    Please forward this to your engineers.

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