PIC 18F452 Interrupts Priority

[Marc-Andre Filion]

Hy,
Is there a way that can place my RS-232 sub-routine in the High priority vector (0x08) instead of the low priority vector (0x0018). I'm using a 18f452 with PCH 3.121.
I don't see anything that can go it right now.

thank!

Marc
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This message was ported from CCS's old forum
Original Post ID: 10030

[R.J.Hamlett]

:=Hy,
:=Is there a way that can place my RS-232 sub-routine in the High priority vector (0x08) instead of the low priority vector (0x0018). I'm using a 18f452 with PCH 3.121.
:= I don't see anything that can go it right now.
:=
:=thank!
The 'key', is in the #INT definition.
If you use:
#INT_RDA FAST
void RDA_ROUTINE(void) {
//code here
}

The routine will be called using the high priority handler. This is documented in the 'readme' for the compiler, but not in the help.
There is however a big 'caveat'. A routine called this way, will not have the registers saved before execution. It becomes your responsibility to do this. Really, the best way, is to keep the code very simple, and perhaps use assembler, to just do the minimum data transfers needed in the routine.

Best Wishes
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This message was ported from CCS's old forum
Original Post ID: 10035