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return to start of main() from ISR

 
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eng.alamin



Joined: 08 Sep 2008
Posts: 17

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return to start of main() from ISR
PostPosted: Mon Aug 30, 2010 5:01 pm     Reply with quote
Hello Guys

I would like to know is it possible to return from interrupt routine directly to the head of the main() function (not to the place where the interrupt occurred).

For example I wrote a program to read from three different sensors:
Code:

#INT_TIMER0
 void  TIMER0_isr(void)  // interrupt every 1 second 
{
 if(flow >=2)
        {
           flow = 0 ;
          s1=0;
          s2=0;
          s3=0
        }
        else flow ++;

}

void sensor1();
void sensor2();
void sensor3();

main()
{

 if(flow == 0 && R==0)
   {
   R =1 ;
sensor1();  // .5 second required for the reading
}

if(flow == 1 && C==0)
   {
   C =1 ;
sensor2();// .5 second required for the reading
}

if(flow == 2 && A==0)
   {
   A =1 ;
sensor3();// .5 second required for the reading
}

}

Well this is not multi-tasking nor threading or what so ever.

I just want to make sure if any one of my sensors is tripping the rest will continue working.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Aug 30, 2010 7:19 pm     Reply with quote
To narrowly answer your question, without looking at program design
issues, see this thread on the reset_cpu() function.
http://www.ccsinfo.com/forum/viewtopic.php?t=18165
jventerprises



Joined: 01 Apr 2004
Posts: 43
Location: Boston

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jump to main
PostPosted: Tue Aug 31, 2010 9:09 am     Reply with quote
well, i'm not sure this is a supported function, and the manual clearly says pointers to functions are not allowed...... but.....

i have done this in the past on 18F series parts and it works.

int32 *main_ptr;
main_ptr = &main;
goto_address(main_ptr);

this jumps to main.

a cleaner way is to just reset the cpu with a reset_cpu();
_________________
Jon
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