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AVR BUG!
Posted: Sat Dec 07, 2013 2:25 pm
by nnnnff
AVR 5.5，“NOT”No effect.Can the Flowcode simulation.Burn wrote chip is no reaction.Inside the proteus also no response!Help me.Thank you very much!
Re: AVR BUG!
Posted: Sat Dec 07, 2013 2:38 pm
by medelec35
Hi nnnnff,
Have you tried
?
Martin
Re: AVR BUG!
Posted: Sun Dec 08, 2013 12:36 am
by nnnnff
caculation:why "!"do!"NOT"not?
Re: AVR BUG!
Posted: Sun Dec 08, 2013 12:49 am
by medelec35
On PIC ! always works for me,
Did it work for you?
Have you checked on hardware, or just simulation?
Re: AVR BUG!
Posted: Wed Dec 11, 2013 12:10 am
by Benj
Hello,
The C code being produced is this.
Code: Select all
//Calculation:
// b = NOT b
FCV_B = ~FCV_B;
~ and ! are slightly different in their operations though your program looks to me like it should work. Hmm.
From stack overflow.
For integral types, ! returns true if the operand is zero, and false otherwise.
So !b here just means b == 0.
As far as I know ~ should flip all the bits in the value so 0x00 would become 0xFF which should work. I may however be wrong on this if its not working on the hardware.