Hi Jan,
> When compiling the following snippet for mcs51, both *px translates to
>
> mov dptr,#_x
> movx a,@dptr
>
> i.e. *x, which may not be true.
>
> Is this an error or just me being stupid?
Hmmm, the latter ;-): As px is obviously modified in an interrupt
routine, you need to declare px as volatile:
> --- code snippet ---
> xdata unsigned char *px;
volatile __xdata unsigned char *px;
should do the job, otherwise
> void main(void) {
> px = x;
>
> if (px == x) {
*is* always true.
Regards,
Raphael
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