Provided by: avr-libc_2.0.0+Atmel3.6.1-2_all bug




   Allowing specific system-wide interrupts
       In addition to globally enabling interrupts, each device's particular interrupt needs to
       be enabled separately if interrupts for this device are desired. While some devices
       maintain their interrupt enable bit inside the device's register set, external and timer
       interrupts have system-wide configuration registers.


       // Enable timer 1 overflow interrupts.

       // Do some work...

       // Disable all timer interrupts.

           Be careful when you use these functions. If you already have a different interrupt
           enabled, you could inadvertantly disable it by enabling another intterupt.

       static __inline__ void timer_enable_int (unsigned char ints)
       #define enable_external_int(mask)   (__EICR = mask)
       #define INTERRUPT(signame)
       #define __INTR_ATTRS   used

   Obsolete IO macros
       Back in a time when AVR-GCC and avr-libc could not handle IO port access in the direct
       assignment form as they are handled now, all IO port access had to be done through
       specific macros that eventually resulted in inline assembly instructions performing the
       desired action.

       These macros became obsolete, as reading and writing IO ports can be done by simply using
       the IO port name in an expression, and all bit manipulation (including those on IO ports)
       can be done using generic C bit manipulation operators.

       The macros in this group simulate the historical behaviour. While they are supposed to be
       applied to IO ports, the emulation actually uses standard C methods, so they could be
       applied to arbitrary memory locations as well.
       #define inp(port)   (port)
       #define outp(val,  port)   (port) = (val)
       #define inb(port)   (port)
       #define outb(port,  val)   (port) = (val)
       #define sbi(port,  bit)   (port) |= (1 << (bit))
       #define cbi(port,  bit)   (port) &= ~(1 << (bit))

Detailed Description

       This header file contains several items that used to be available in previous versions of
       this library, but have eventually been deprecated over time.

       #include <compat/deprecated.h>

       These items are supplied within that header file for backward compatibility reasons only,
       so old source code that has been written for previous library versions could easily be
       maintained until its end-of-life. Use of any of these items in new code is strongly

Macro Definition Documentation

   #define cbi(port, bit)   (port) &= ~(1 << (bit))

       Clear bit in IO port port.

   #define enable_external_int(mask)   (__EICR = mask)

       This macro gives access to the GIMSK register (or EIMSK register if using an AVR Mega
       device or GICR register for others). Although this macro is essentially the same as
       assigning to the register, it does adapt slightly to the type of device being used. This
       macro is unavailable if none of the registers listed above are defined.

   #define inb(port)   (port)

       Read a value from an IO port port.

   #define inp(port)   (port)

       Read a value from an IO port port.

   #define INTERRUPT(signame)

       void signame (void) __attribute__ ((interrupt,__INTR_ATTRS));  void signame (void)


       Introduces an interrupt handler function that runs with global interrupts initially
       enabled. This allows interrupt handlers to be interrupted.

       As this macro has been used by too many unsuspecting people in the past, it has been
       deprecated, and will be removed in a future version of the library. Users who want to
       legitimately re-enable interrupts in their interrupt handlers as quickly as possible are
       encouraged to explicitly declare their handlers as described above.

   #define outb(port, val)   (port) = (val)

       Write val to IO port port.

   #define outp(val, port)   (port) = (val)

       Write val to IO port port.

   #define sbi(port, bit)   (port) |= (1 << (bit))

       Set bit in IO port port.

Function Documentation

   static __inline__ void timer_enable_int (unsigned char ints) [static]

       This function modifies the timsk register. The value you pass via ints is device specific.


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