Re: [avr-gcc-list] (no subject)

[Arkadiusz Krysiak]

Thanks.
It explain compiller behavior and different mask then i set.


Dnia 29-06-2008 o godz. 0:12 Ruud Vlaming napisał(a):
> Hi
> 
> If i try (changed your code a bit to make it compile)
>   #define mbitPatternPowerMode (7<<2)
>   #define mADCNoiseReduction 0x20
>   #define mbitSleepMask 0x04
> 
>   void Test_MCUCR(void)
>   {
> MCUCR=(MCUCR&(~mbitPatternPowerMode))|(mADCNoiseReduction|mbitSleepMask);
> }
> 
> I get the same result. If you however try the same with
>   #define mADCNoiseReduction   0x10
> 
> You get 0xE3 as expected. The point is, defining mADCNoiseReduction
> with bit 5 set, it does not make a difference to the result if you
> use 0xC3 or 0xE5. So the compiler "optimized" it for you.
> 
> greetings
> Ruud.
> 
> 
>  
> 
> 
> On Saturday 28 June 2008 12:28, Arkadiusz Krysiak wrote:
> > can anyone explain that behavior?
> > 
> > i have:
> > #define mbitPatternPowerMode=(7<<2);
> > 
> > MCUCR=(MCUCR&(~mbitPatternPowerMode))|(mADCNoiseReduction|mbitSleepMask);
> > 
> > and i get before compilation:
> > 
> > +00000088:   B785        IN      R24,0x35         In from I/O location
> > +00000089:   7C83        ANDI    R24,0xC3         Logical AND with
> > immediate
> > ;                                    ^^^^ bad value i expect 0xE3
> > instead of 0xC3   :O
> > 
> > +0000008A:   6284        ORI     R24,0x24         Logical OR with
> > immediate
> > +0000008B:   BF85        OUT     0x35,R24         Out to I/O location
> > 
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> > 
> > 
> > 
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