[sdcc-devel] [ sdcc-Support Requests-1613432 ] Hook

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Support Requests item #1613432, was opened at 2006-12-11 20:13
Message generated for change (Comment added) made by maartenbrock
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Category: None
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: Anton (candanabi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Hook

Initial Comment:
How to hook interrupt vector ?

Regards.

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>Comment By: Maarten Brock (maartenbrock)
Date: 2006-12-13 11:14

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Of course it's not working.

1) I said do not include the header file and you insist on doing
otherwise. Remove it.
2) What is MY_INTERRUPT and why is it there? Remove it.
3) Why are you defining (implementing) functions in a header in the first
place? That is very bad practice. Only put preprocessor macros, extern
declarations of variables and function prototypes in header files. Create
a second source file puppy.c and include puppy.h in it if you need.

Maarten


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Comment By: Anton (candanabi)
Date: 2006-12-13 10:04

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Marteens, it's not working

#include "at89x52.h"

#include <puppy.h>

void MY_INTERRUPT (void) interrupt 0;

void main (void)
{
  EA = 1;
}

void INT0_INTVECT(void);

static void dummy (void) _naked
{
  _asm
  LJMP	_INT0_INTVECT
  _endasm;
}

inside puppy.h

void INT0_INTVECT(void) interrupt 0 using 1
{
  EA = 0;
  P0 = 0xFF;
  EA = 1;
}

Error message:
SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.6.1 #4376 (Sep 14 2006) (MINGW32)

Compiling...
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/dog.c(5) : error 71: interrupt no '0'
already has a service routine 'INT0_INTVECT'
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/dog.c(9) : error 103: code not generated
for 'main' due to previous errors
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/dog.c(12) : error 91: extern definition
for 'INT0_INTVECT' mismatches with declaration.
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/puppy.h(1) : error 177: previously
defined here
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/dog.c(12) : error 71: interrupt no '0'
already has a service routine 'INT0_INTVECT'
D:/WorkDir/Mikro/KOMUNI~1/Fax/01/dog.c(18) : error 103: code not generated
for 'dummy' due to previous errors

Compile error! Output not generated.


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Comment By: Maarten Brock (maartenbrock)
Date: 2006-12-12 21:25

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Ok, I assume you're using SDCC for mcs51.

Currently SDCC only generates interrupt vectors for ISR's that are known
compiling function main(). So if you don't include this header file, but
define your own ISR's they will be used instead.

void main(void)
{
}

void MyIsr(void) interrupt 0 using 1
{
  ...
}

If you also need to call the original INT0_INTVECT from your ISR I
recommend (inline) assembly.

void MyIsr(void) interrupt 0; //leave this prototype near main

void main(void)
{
}

void INT0_INTVECT(void); //prototype for original ISR to jump to

static void dummy(void) _naked
{
  _asm
_MyIsr:
    ...
    ljmp _INT0_INTVECT
  _endasm
}

Greets,
Maarten

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Comment By: Anton (candanabi)
Date: 2006-12-12 19:54

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This is an example:

void INT0_INTVECT (void) interrupt 0 using 1
{
  // routines
}

the above interrupt function is on header file and it fixed,
there is no way i can modified it.

so i need to hook up interrupt vector address to my own.

how do i do that ?

I thought RTFM is Read The F***ing Manual :P

Regards.

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Comment By: Jesus Calvino-Fraga (jesusc)
Date: 2006-12-12 04:33

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Google it!  Something like: Read The 'Fantastic' Manual...  or is it
Fenomenal??? You can find the manual here:

http://sdcc.sourceforge.net/



----------------------------------------------------------------------

Comment By: Anton (candanabi)
Date: 2006-12-12 04:27

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What is RTFM ? 

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Comment By: Maarten Brock (maartenbrock)
Date: 2006-12-11 20:42

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If you can provide this little information the only answer can be RTFM.

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