msp430-gcc and signals.h deprecated

[gcb 0]

pretty much all the code/tutorials i find about interrupts use signal.h and it's macros.

 

and signal.h on my current headers (msp430-gcc (GCC) 4.5.3) complains it's deprecated and

1) should not be used

2) use legacymsp430.h

 

well, i tried #2 first, it fails.

 

then i tried to see what I should be using instead, and failed. everything i found uses signal.h

 

Any doc/sample code i should be looking?

 

the manuals is all about signal.h

(link to manual that i can't include because new users can't post links)

 

Writing interrupt service routines

 

mspgcc allows interrupt service routines to be written efficiently in C. To access the interrupt features of mspgcc the header file

 

#include

should be included in any source files where interrupt service routines are defined.

[gcb 0]

btw ...should i be using something else than msp430-gcc?

[gordon 229]

The only thing you need is msp430.h (and the libc headers should you use libc, of course) and the correct -mmcu= setting.

[gcb 0]

The only thing you need is msp430.h (and the libc headers should you use libc, of course) and the correct -mmcu= setting.

 

 

and how do i declare the interrupts?

 

the manual says to use signal.h

http://mspgcc.sourceforge.net/manual/x918.html

 

The code i find around uses magic strings that i can't find in msp430.h, e.g.

interrupt(PORT1_VECTOR) Port_1(void) {

 

which fail:

msp430-gcc -Os -Wall -g -mmcu=msp430g2231 -c uart.c

uart.c:36:6: warning: return type of

[rockets4kids 204]

I'm not sure if there is a "proper" way, but here is how I set up interrupt handling so that the same code will work under GCC and CCS:

 

#if defined (__GNUC__)  // mspgcc
#include 
#define NORETURN __attribute__ ((noreturn))
#define ISR(a, void __attribute__((interrupt (a))) b (void)
#else // CCS/IAR
#include 
#define NORETURN 
#define __PRAGMA__(x) _Pragma(#x)
#define ISR(a, \
__PRAGMA__(vector=a) \
__interrupt void b(void)
#endif

 

And then define an interrupt service routine like this:

 

ISR (WDT_VECTOR, watchdog_timer)
{
}

[Fe2o3Fish 33]

For what it's worth, this is what I use without complaints:

#include 
#define interrupt(x) void __attribute__((interrupt (x)))
....

interrupt(TIMERA1_VECTOR) Timer_A(void)
{
   /* ISR */
}

Naturally, your vector name will vary. :-)

This is for msp430-gcc version 4.5.3 on Linux.

 

-Rusty-

[gordon 229]

... and if you use 4.6 (the current LTS), it understands most other variations without having to jump hoops.

[pabigot 355]

I'm not sure if there is a "proper" way...

 

For mspgcc, the proper way is the __attribute__((__interrupt__(x))) annotation, as everything else is simply syntactic sugar around that (mostly handled by macros in headers, as the old "signal.h" did). As gordon points out, LTS-20120406 also recognizes the TI #pragma syntax; in that case the sugar's hidden in the compiler, but it's still fundamentally an attribute.

 

There's also an isr_compat.h header you could use which has that ISR macro and isn't deprecated (though it also only gets looked at when somebody complains that it doesn't work anymore).

[rockets4kids 204]

There's also an isr_compat.h header you could use which has that ISR macro and isn't deprecated (though it also only gets looked at when somebody complains that it doesn't work anymore).

 

Which is exactly why I roll my own macros to take care of the issue. ;-)