[Sdcc-user] FW: Function Pointers in SDCC (Meant to cc it to the list)

[<M.v...@ca...>]

Matthew van de Werken
Electronics Engineer
CSIRO Exploration & Mining - Gravity Group
1 Technology Court - Pullenvale - Qld - 4069
ph:  (07) 3327 4685     fax:  (07) 3327 4455
email:  m.v...@ca...


> -----Original Message-----
> From: Van De Werken, Matt (EM, Pinjarra Hills) 
> Sent: Tuesday, 18 September 2001 10:42 AM
> To: 'mat...@st...'
> Subject: Function Pointers in SDCC
> 
> 
> Hi all:
> 
> I was asked the question of how to use function pointers 
> under sdcc; here's the reply:
> 
> I use function pointers to provide a callback function for my 
> timer interrupt routine. I haven't tried changing it 
> on-the-fly yet - it's statically assigned at the moment (ie, 
> it's not changed at run-time). I'm not sure whether changing 
> the function at run-time will work, so any feedback on this 
> would be welcome...
> 
> Anyway, here's a skeleton of my code, using function pointers:
> 
> /*  intr.h - setting up the interrupt service routine for 
> x-millisecond interrupts */
> 
> #ifndef __INTR_H
> #define __INTR_H
> 
> typedef void (*intr_func_ptr)() ;  
> void init_intr(unsigned char, intr_func_ptr);    
> void timer_intr() interrupt 5;    
> 
> #endif
> 
> /* END INTR.H */
> 
> /* intr.c - where the actual functions are defined */
> 
> #include "intr.h"
> #include "ADuC812.h"
> 
> intr_func_ptr intr_func;     // This is the function actually called 
>                              // by the timer_interrupt         
> 
> void init_intr(unsigned char msec, intr_func_ptr fptr){
> 
>  /* stuff deleted */
> 
>   intr_func = fptr;  // Set the function to be called on interrupt
> 
>   /* setting up of timer deleted here */
> 
> }
> 
> void timer_intr() interrupt 5{
> 
> //  static unsigned char counter=0;
> 
>   TF2 = 0;
>   EXF2 = 0;     // This shouldn't have been set, but we check 
> anyway...
>   intr_func();
> 
> }   
> 
> /* END INTR.C */
> 
> 
> /* main.c - the main loop */
> 
> #include "intr.h"
> 
> void f() ;
> 
> void main(){
> 
>   intr_func_ptr fptr;
> 
>   fptr = f;
>   init_intr(50, fptr);   // Sets the interrupt for 50 
> milliseconds, calling f() every time.
> 
>   while(1){}
> 
> }
> 
> void f(){
> 
>   /* Do stuff here (Flash a LED if you don't believe me it works) */
> 
> }
> 
> /* END MAIN */
> 
> 
> I hope this has helped someone.
> 
> I'm sure changing the function at run-time would work - you'd 
> have to either change the declaration of intr_func to intr.h 
> or make a new function in intr.[ch] 
> intr_set_callback(intr_func_ptr), which is easy enough to do.
> 
> Cheers,
> Matthew van de Werken
> Electronics Engineer
> CSIRO Exploration & Mining - Gravity Group
> 1 Technology Court - Pullenvale - Qld - 4069
> ph:  (07) 3327 4685     fax:  (07) 3327 4455
> email:  m.v...@ca...
> 
> 
> > -----Original Message-----
> > From: mat...@st...
> > [mailto:mat...@st...]
> > Sent: Monday, 17 September 2001 5:50 PM
> > To: M.v...@ca...
> > Subject: AW: RE: [Sdcc-user] A tale of two interrupts...
> > 
> > 
> > I have a question?
> > Can you tell me, how do you programm an pointer to a 
> > function, and what compiler options do you use?
> > I have tried it, but it doesn't work.
> > Best regards
> > Matthias Hellge
> > 
> > -- Original Nachricht--
> > Von: M.v...@ca...
> > An: sdc...@li...
> > Senden: 08:26 AM
> > Betreff: RE: [Sdcc-user] A tale of two interrupts...
> > 
> > First of all, thankyou to those who have replied to me already. I've
> > narrowed down (some) of my problems, for those still willing 
> > to give some
> > advice:
> > 
> > I can 'putchar(c)', but I can't 'printf' - what gives? Where 
> > should I define
> > my putchar - in main(), or in my serial.h routine which is included?
> > 
> > Note that I'm more or less using the serial routines as 
> > written by Victoria
> > Welch, on the okr web site, not the library routines.
> > 
> > So, summary:
> > 
> > putchar(c) works, definitely.
> > printf("Hello, world!
> > 
> > ") does NOT work, definitely (I have the library
> > path set correctly, I'm using the winbin version downloaded 
> > from okr very
> > recently. If I could get sdcc to compile on my Linux box then 
> > I could check
> > the program there....)
> > 
> > What gives?
> > 
> > Cheers,
> > Matthew van de Werken
> > Electronics Engineer
> > CSIRO Exploration & Mining - Gravity Group
> > 1 Technology Court - Pullenvale - Qld - 4069
> > ph:  (07) 3327 4685     fax:  (07) 3327 4455
> > email:  m.v...@ca...
> > 
> > 
> > _______________________________________________
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> > Sdc...@li...
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> > 
> > 
> > 
> > 
> > 
>