problem assigning value to global variables
Tue May 2 11:24:00 GMT 2000
Art Berggreen wrote:
> You didn't include the call to readBuffer. I hope you are not expecting
> the "buffer" variable in the readBuffer() function to be the same as the
> global "buffer" array. One is a global variable, the other is a formal
> parameter to the function with a scope local to that function.
It's called as readBuffer(buffer).
> Second, (I don't know how IDE drives behave) if successive reads to
> DATA_PORT return different values, you want to make sure that DATA_PORT
> is declared as a pointer to volatile. Otherwise the compiler can
> optimize the read out of the loop and only read once. This could change
> between compiler versions.
It wasn't declared as a pointer to volatile (it should be, and I've
changed it), but the assembly code has the read inside the loop either
way - so that's not the problem, unfortunately. Is there some
difference in the way the different compiler versions assign pointers?
Or where they locate global variables?
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