reset_cpu() in int_rda service routine

Guest · Posted: Wed Mar 01, 2006 4:14 pm

I thought PIC16F628A has a MCLR instruction set . . . well, it does not, but can I call reset_cpu() in RDA servicie routine?

I know stack will be left intact and possibly a harzard, but as PCM Programmer pointed in various thread, the stack is circular, so no problem . . . but are there any other issues?

Thanks in advance.

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

I am wondering if you really have to structure your program in this way ?

Why do you believe that you have to re-start program execution from
the reset vector (address 0x0000) if you receive a 0xFF byte ?

Why not just instead, perhaps go to the start of a while() loop ?

Humberto · Posted: Wed Mar 01, 2006 4:36 pm

asmallri · Joined: 12 Aug 2004 Posts: 1635 Location: Perth, Australia

I have done this previously. I did have one verison of the PCH compiler that had a bug (not sure of the versions 3.229?) that required two reset_cpu() instructions one after the other to work. My code was inside a case statement and the time and the compiler incorrectly branched past the first instruction.
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Guest · Posted: Wed Mar 01, 2006 8:02 pm

Kender, that is so funny.

Well, WDT works fine but a long delay? in milliseconds? No, I'd rather commit suicide :-)

Guest · Posted: Wed Mar 01, 2006 8:06 pm

PCM programmer, well, I want my core code to execute without any interrupts when delay_xx() is called but want to break that tight loop, so a reset_cpu() or MCLR would be fine.

As you said, maybe I should invest some time to do my own delay routines, I did it using another compiler that does not have a lot of builtin functions but failed at accuracy. So I bought this compiler . . .

Guest · Posted: Wed Mar 01, 2006 10:25 pm

Humberto, the reason is, I am too lazy to figure out my own PRECISE delay function.

Guest · Posted: Wed Mar 01, 2006 10:25 pm

asmallri, thanx.