access to a bit

[id31]

Hi,
I have a question please,

I declared:
#bit TRMT=TX1STA.1

if I want to create another variable - NEW_VAR that I can access to TRMT value so:
if (TRMT)
and
if (NEW_VAR)
will be the same..

is this possible?

is
int1 NEW_VAR=TRMT; ,is good?
#define NEW_VAR TRMT ,is good?

#bit NEW_VAR=TRMT not compile..

thank you

[RF_Developer]

[id31]

OK, got it! thank you

[Ttelmah]

This:
int1 NEW_VAR=TRMT;

won't work.
It declares a new variable sitting somewhere else in memory, that is then loaded at the moment of declaration with the value in 'TRMT'.
Writing to NEW_VAR would write to it, not to TRMT. Reading NEW_VAR, would read it, and if TRMT has changed, the value would be out of date. Also wastes a bit of RAM to hold this.

This:
#define NEW_VAR TRMT

is perfectly fair. All #define does is create a text macro. So whenever 'NEW_VAR is typed in the code, it'll be replaced at compile time, with TRMT.

You can also just use:
#bit NEW_VAR=TXSTA.1

This creates another variable called 'NEW_VAR' that points to the same location in memory as TRMT.

Declaring an actual new variable will have the same effect in CCS. However in languages that implement more stringent type checking, it ensures that the compiler 'knows' the actual type of the variable involved, when performing syntax checking.