It Just Didn't Work

Here is my C program, it didn't work and I don't know why, it's supposed to be a very simple thing... the PIC has to digitalyze a signal, but it just didn't work. Anyway my program is more complex than necessary, it is a very simple thing that the PIC has to do, but i just don't know where the problem is.

(where is the problem? -----> "more complex than necessary")