> Back to the MACRO, wouldn't it be enough with saving and disabling
> INTCONbits.GIE? Reading 18F2550 datasheet, GIE disables all interrupts
> so PEIE doesn't seem necessary here. Is it different with other PICs? Am I
> missing something?
>From Figure 9-1 in DS39609B (Interrupt logic gate diagram), I believe
that you are right. The __critical{} replacement code can thus be
simplified / made more efficient via:
uint8_t __intcon = INTCON;
INTCON &= ~0x7f;
// critical code here
if (__intcon & 0x80) {
INTCON |= 0x80;
}
Ideally, this results in something like:
BANKSEL ___intcon
MOVFF _INTCON, ___intcon
BCF _INTCON, 7, A
/* critical code */
BANKSEL ___intcon
BTFSC ___intcon, 7, B
BSF _INTCON, 7, A
which will be difficult to implement using __asm __endasm due to
impossible references to local variables :-(. The compiler should do
fine, though.
Have fun!
Raphael
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