Hi,
> But when I look at the compiled (assembler source code) I see no
> difference with or without the __critical keyword nor any evidence
> of any interrupt disabling code.
>
> So what am I doing wrong?
Errr, nothing: __critical is not implemented for the PIC ports.
You can partially emulate its effect by disabling interrupts
manually and see if that helps.
/* All code untested. */
iflags = (INTCON & 0xC0);
INTCON &= ~0xC0;
// critical code here
INTCON |= iflags;
or wrapped in a macro:
#define CRITICAL(CODE) do { \
static unsigned char __sdcc_iflags = (INTCON & 0xC0); \
INTCON &= ~0xC0; \
do { CODE; } while (0); \
INTCON |= __sdcc_iflags; \
} while(0)
CRITICAL(low = 1; high = 42);
// or
CRITICAL(critical_function());
Hope that helps,
Raphael
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