CMSIS Example - Signal

/*----------------------------------------------------------------------------
 *      RL-ARM - RTX
 *----------------------------------------------------------------------------
 *      Name:    RTX_EX1.C
 *      Purpose: Your First RTX example program
 *----------------------------------------------------------------------------
 *
 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  - Neither the name of ARM  nor the names of its contributors may be used 
 *    to endorse or promote products derived from this software without 
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *---------------------------------------------------------------------------*/

#include "cmsis_os.h"

/* Forward reference */
void threadX (void const *argument);

/* Thread IDs */
osThreadId main_id;
osThreadId threadX_id;

/* Thread definitions */
osThreadDef(threadX, osPriorityNormal, 1, 0);

/*----------------------------------------------------------------------------
 *   Thread X
 *---------------------------------------------------------------------------*/
void threadX (void const *argument) {
  for (;;) {
    /* Wait for completion of do-this */
    osSignalWait(0x0004, osWaitForever); /* do-that */
    /* Pause for 20 ms until signaling event to main thread */
    osDelay(20);
    /* Indicate to main thread completion of do-that */
    osSignalSet(main_id, 0x0004);
  }
}

/*----------------------------------------------------------------------------
 *   Main Thread
 *---------------------------------------------------------------------------*/
int main (void) {

  /* Get main thread ID */
  main_id = osThreadGetId();
  /* Create thread X */
  threadX_id = osThreadCreate(osThread(threadX), NULL);
  for (;;) {    /* do-this */
    /* Indicate to thread X completion of do-this */
    osSignalSet(threadX_id, 0x0004);
    /* Wait for completion of do-that */
    osSignalWait(0x0004, osWaitForever);
    /* Wait now for 50 ms */
    osDelay(50);
  }
}

/*----------------------------------------------------------------------------
 * end of file
 *---------------------------------------------------------------------------*/