AVR BUG!

[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!

AVR bug.rar

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[medelec35]

Hi nnnnff,
Have you tried

Code: Select all

b = !b

?

Martin

[nnnnff]

caculation:why "!"do!"NOT"not?

[medelec35]

On PIC ! always works for me,

Did it work for you?

Have you checked on hardware, or just simulation?

[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.