Posted on May 17, 2011 at 13:52''I found out that the problem is that I destroy R7, when I take a look after compiling to my assembler code I can see that my application is moveing R7 to the stack pointer?!? But why?''
I would guess that the compiler is saving R13 in a register and that register happens to end up being (after register allocation) R7.
Do as PICguy suggests. Only R0 to R3 are scratch registers and so other registers need to be specifically preserved.
