TM4C123G ROM GPIOPinRead Invert a bit

Hello Arian,

where x = 00011100b (note padded with a 0 to extend to 8 bits since generally 8 bits is the minimum size for a char) you would simply AND in the value 11111011 which would effectively clear bit2 (or as you reference bit3; note usually bit numbering is 0 based in embedded processing). So the finally expression would look like invx = x & (0xFB) assuming x is a unsigned char type as noted in your explanation. If it is a unsigned in or word, you would need to pad with 1 accordingly. or you could use exclusive OR to invert regardless of the initial state but this would need a different mask. invx = x^(0x04) which would invert bit2 irrespective of whether it was a 1 or 0 to begin with.

invert regardless of initial state

Arian,

I am not certain what the intent of your very short post is. Can you elaborate what you expect in response? I have given two examples of how to manipulate bits within a unsigned char with one being a very simple case to simply set the bit to a 0 regardless of the initial state. The second to toggle to the opposite value regardless of initial state. These are both very basic operations in the area of embedded processing.

And not just in embedded (although it's more prominently used in embedded)

lmgtfy.com/

Robert

Thank you