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mspware does have functions to set up pins, but if you don't use that lib here is how I do it with a C macro (tested on IAR)makes it easy to change at one location if pcb board change, with much less chance of a bug if you missed a change somewhere.## in the macro is so "P1" "OUT" is one word
place this in common.h
#define read &
#define clear &= ~
#define set |=
#define toggle ^=
#define Button(y,x) (P1 ##x y BIT3) // active low
#define RedLED(y,x) (P1 ##x y BIT0) // active high
then in main when you set up button IRQ for example, you can do this:
Button(set,OUT); // Pull-up
Button(set,IES); // falling edge
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