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Thema: Problem mit int0 beim ATMEGA32... (kein Rising möglich?)

  1. #1
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    Problem mit int0 beim ATMEGA32... (kein Rising möglich?)


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    Ich hab n ATMEGA32. Wollte das int0 bei steigender Flanke benutzen (Rising). Bascom meckert rum, das int0 bis int2 immer low level ist bei den MEGA´s... wenn ich allerdings für ein ATMEGA16 compile, dann compiled er auch. Nur wenn der ATMEGA32 eingestellt ist meckert er rum. Woran liegt das? Wie kann ich jetzt int0 als rising konfigurieren?



  2. #2
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    So hab was gefunden. Ich poste das hier nochmal just for info, falls jemand anderes nochmal auf den Fehler stößt:

    Hi List,
    On the issue of INT0 on the Mega32 (and several others), I spernt a few
    minutes looking at the data sheets So far as ATMEL is conserned, INT0 and
    INT1 CAN be configured for Low, Any Change, Falling, or Rising. It is INT2
    that only triggers on Low Level (probably because they had no more bits to
    control it). Mark must have misread this or typo'd it when he added the
    newer Megas.

    The upshot is:
    There IS a compiler error. It states that INTO - INT2 only trigger on low
    There is also, I believe, a related error in the simulator that keeps M8,
    M16, M32, & M64 from responding to INT0 but allows the other Megas to act

    Workaround? YES, for the compiler... and it's simple.
    In the MCUCR (Recognized by Bascom so you can talk to it)
    Bits .0 and .1 control INT0
    Bits .2 and .3 control INT1
    The Bit patterns to set up either Interrupt are:
    00 Low Level
    01 Any Change* (A NICE Feature not yet addressed by Bascom)
    10 Falling Edge
    11 Rising Edge
    (Each bit has its own name, but these names weren't known to Bascom,)
    Simpler code is possible and assembler would be more compact, but the
    following code does it:

    ' To Configure INT0 = FALLING and conserve MCUCR
    MCUCR = MCUCR AND &HFC 'Mask off Bits .0 and .1
    MCUCR = MCUCR OR &H02 ' "Fallimg" bit pattern

    That's all there is. Move two bits to the left for INT1.
    I tested this in the simulator only, not on hardware. It works fine on all
    but the mega's listed above. I ASSUME that a simulator error prevents
    proper INT action in the simulator and that the workaround will make the
    hardware respond properly. I'd appreciate hearing if it does.

    Its amazing what these data sheets can tell you.


    *On most or all of newer AVRs.


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