compat/deprecated.h: deprecated items(3)

NAME

<compat/deprecated.h>: Deprecated items

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.

Example:

// Enable timer 1 overflow interrupts.
timer_enable_int(_BV(TOIE1));

// Do some work...

// Disable all timer interrupts.
timer_enable_int(0);

Note:

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 endof-life. Use of any of these items in new code is strongly discouraged.

Define Documentation

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

Clear bit in IO port port.

#define enable_external_int(mask) (__EICR = mask) Deprecated

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) Deprecated

Read a value from an IO port port.

#define inp(port) (port) Deprecated

Read a value from an IO port port.

#define INTERRUPT(signame) Value:

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

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) Deprecated

Write val to IO port port.

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

Write val to IO port port.

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

Set bit in IO port port.

Function Documentation

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

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

Author

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Version 1.6.7 15<compat/deprecated.h>: Deprecated items(3)