1 /*

     2 

     3 Template C code used to produce target Ethercat C code.

     4 

     5 Copyright (C) 2011-2014: Laurent BESSARD, Edouard TISSERANT

     6 

     7 Distributed under the terms of the GNU Lesser General Public License as

     8 published by the Free Software Foundation; either version 2 of the License, or

     9 (at your option) any later version.

    10 

    11 See COPYING file for copyrights details.

    12 

    13 */

    14 

    15 #include "iec_types_all.h"

    16 

    17 #define FREE 0

    18 #define ACQUIRED 1

    19 #define ANSWERED 2

    20 

    21 long SDOLock = FREE;

    22 extern long AtomicCompareExchange(long* atomicvar,long compared, long exchange);

    23 

    24 int AcquireSDOLock() {

    25 	return AtomicCompareExchange(&SDOLock, FREE, ACQUIRED) == FREE;

    26 }

    27 

    28 void SDOAnswered() {

    29 	AtomicCompareExchange(&SDOLock, ACQUIRED, ANSWERED);

    30 }

    31 

    32 int HasAnswer() {

    33 	return SDOLock == ANSWERED;

    34 }

    35 

    36 void ReleaseSDOLock() {

    37 	AtomicCompareExchange(&SDOLock, ANSWERED, FREE);

    38 }

    39 

    40 int __init_etherlab_ext()

    41 {

    42     SDOLock = FREE;

    43     return 0;

    44 }

    45 

    46 void __cleanup_etherlab_ext()

    47 {

    48 }

    49 

    50 void __retrieve_etherlab_ext()

    51 {

    52 }

    53 

    54 void __publish_etherlab_ext()

    55 {

    56 }