File content as of revision 3:3d2422feccb5:

/* mbed SWO Library
 *  Copyright (c) 2017, v01: WH. External declared swo
 *
 * Simple implementation for tracing via Serial Wire Output(SWO) for Cortex-M processors.
 * It can be used with Host PC software such as ST-LINK Utility or Segger J-Link SWO viewer.
 * This sample implementation ensures that output via SWO is enabled in order to guarantee
 * that the application does not hang.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
#include "mbed.h"
#include "flip.h"
#include "SWO.h"

extern SWO_Channel swo;

/**
* flip()
*
* @brief invert value and print a string via SWO.
* @param int value The value to be printed.
*/
int flip(int value) {
  swo.printf(" value=%d\n\r", value);
  return -value;
}