CMSIS Example - Signal

 1 /*----------------------------------------------------------------------------
 2  *      RL-ARM - RTX
 3  *----------------------------------------------------------------------------
 4  *      Name:    RTX_EX1.C
 5  *      Purpose: Your First RTX example program
 6  *----------------------------------------------------------------------------
 7  *
 8  * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
 9  * All rights reserved.
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  *  - Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *  - Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *  - Neither the name of ARM  nor the names of its contributors may be used 
18  *    to endorse or promote products derived from this software without 
19  *    specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  *---------------------------------------------------------------------------*/
33 
34 #include "cmsis_os.h"
35 
36 /* Forward reference */
37 void threadX (void const *argument);
38 
39 /* Thread IDs */
40 osThreadId main_id;
41 osThreadId threadX_id;
42 
43 /* Thread definitions */
44 osThreadDef(threadX, osPriorityNormal, 1, 0);
45 
46 /*----------------------------------------------------------------------------
47  *   Thread X
48  *---------------------------------------------------------------------------*/
49 void threadX (void const *argument) {
50   for (;;) {
51     /* Wait for completion of do-this */
52     osSignalWait(0x0004, osWaitForever); /* do-that */
53     /* Pause for 20 ms until signaling event to main thread */
54     osDelay(20);
55     /* Indicate to main thread completion of do-that */
56     osSignalSet(main_id, 0x0004);
57   }
58 }
59 
60 /*----------------------------------------------------------------------------
61  *   Main Thread
62  *---------------------------------------------------------------------------*/
63 int main (void) {
64 
65   /* Get main thread ID */
66   main_id = osThreadGetId();
67   /* Create thread X */
68   threadX_id = osThreadCreate(osThread(threadX), NULL);
69   for (;;) {    /* do-this */
70     /* Indicate to thread X completion of do-this */
71     osSignalSet(threadX_id, 0x0004);
72     /* Wait for completion of do-that */
73     osSignalWait(0x0004, osWaitForever);
74     /* Wait now for 50 ms */
75     osDelay(50);
76   }
77 }
78 
79 /*----------------------------------------------------------------------------
80  * end of file
81  *---------------------------------------------------------------------------*/