Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

signed int         _ _reverse( signed int);

unsigned long      _ _reverse(unsigned long);

signed long        _ _reverse( signed long);

void _ _far *       _ _reverse(void _ _far *);  /* Only on -v4 */

                                             /* and -v6 */

void _ _huge *      _ _reverse(void _ _huge *); /* Only on -v4 */

                                             /* and -v6 */

void _ _farflash *  _ _reverse(void _ _farflash *);

            /* Only on -v2 through -v6 with > 64k flash memory */

void _ _hugeflash * _ _reverse(void _ _hugeflash *);

            /* Only on -v2 through -v6 with > 64k flash memory */

_ _save_interrupt

unsigned char _ _save_interrupt(void);

This intrinsic function will save the state of the interrupt flag in the byte returned. This 
value can then be used for restoring the state of the interrupt flag with the 

_ _restore_interrupt

 intrinsic function.

unsigned char oldState;

oldState = _ _save_interrupt();

_ _disable_interrupt();

/* Critical section goes here */

_ _restore_interrupt(oldState);

_ _segment_begin

void * __segment_begin(segment);

Returns the address of the first byte of the named 

. The named 

 must 

be a string literal that has been declared earlier with the 

#pragma

 

segment

 directive. 

See #pragma segment, page 224.

If the segment was declared with a memory attribute 

, the type of the 

_ _segment_begin

 function is pointer to 

 

void

. Otherwise, the type is a 

default pointer to 

void

.

#pragma segment="MYSEG" _ _huge

...

segment_start_address = _ _segment_begin("MYSEG");

Here, the type of the 

_ _segment_begin

 intrinsic function is 

void _ _huge *

.