Re: [avr-gcc-list] SIGNAL or INTERRUPT ?!

[User Tomdean]

The difference is in the compiler and the code it supplies for the
handler.  Section 6.20.6, SIGNAL(...).  Section 6.20.4, INTERRUPT(...).

Lookup the respective __attribute__ in the gcc documents.

In avr/signal.h,

/** \def SIGNAL(signame)
    \ingroup avr_interrupts
    \code#include <avr/signal.h>\endcode
    Introduces an interrupt handler function that runs with global interrupts
    initially disabled.  */
...
#define SIGNAL(signame)                                 \
void signame (void) __attribute__ ((signal));           \
void signame (void)


/** \def INTERRUPT(signame) 
    \ingroup avr_interrupts
    \code#include <avr/signal.h>\endcode
    Introduces an interrupt handler function that runs with global interrupts
    initially enabled. This allows interrupt handlers to be interrupted. */
...
#define INTERRUPT(signame)                              \
void signame (void) __attribute__ ((interrupt));        \
void signame (void)

tomdean