Bit Select

[jbchrist]

Ok....This should be an easy question, but I can't find the answer because I don't know what to look for.

I am writing a program for a PIC16f684, using the PIC C lite complier.

I have a 8 bit value stored and I want to take bit x and store it in a different variable.

How do I do that?

John

 

[Pommie]

I would guess,

NewVar = OldVar&(1<<X);

Would issolate the bit. (X = 0 to 7)

Mike.
Edit changed the operator to the bitwise one as PB pointed out.
Note to self, don't post at 2AM after a night out.

 

[Papabravo]

Using the && relational operator with an actual C compiler would be a pretty hard bug to find. You should use the bitwise & operator which will get you the intended result.

I would also highly recommend that you examine carefully the compiler's assembly language output to verify that it is doing what you want it to do.

 

[jbchrist]

Thanks! That worked beautifully!