xref: /btstack/3rd-party/segger-rtt/SEGGER_RTT_Syscalls_GCC.c (revision 7dc86dfd3569d69491d87d64749fd45afb46c67a)

/*********************************************************************
*               SEGGER MICROCONTROLLER GmbH & Co. KG                 *
*       Solutions for real time microcontroller applications         *
**********************************************************************
*                                                                    *
*       (c) 2014 - 2016  SEGGER Microcontroller GmbH & Co. KG        *
*                                                                    *
*       www.segger.com     Support: [email protected]               *
*                                                                    *
**********************************************************************
*                                                                    *
*       SEGGER RTT * Real Time Transfer for embedded targets         *
*                                                                    *
**********************************************************************
*                                                                    *
* All rights reserved.                                               *
*                                                                    *
* SEGGER strongly recommends to not make any changes                 *
* to or modify the source code of this software in order to stay     *
* compatible with the RTT protocol and J-Link.                       *
*                                                                    *
* Redistribution and use in source and binary forms, with or         *
* without modification, are permitted provided that the following    *
* conditions are met:                                                *
*                                                                    *
* o Redistributions of source code must retain the above copyright   *
*   notice, this list of conditions and the following disclaimer.    *
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* o Redistributions in binary form must reproduce the above          *
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*   disclaimer in the documentation and/or other materials provided  *
*   with the distribution.                                           *
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* o Neither the name of SEGGER Microcontroller GmbH & Co. KG         *
*   nor the names of its contributors may be used to endorse or      *
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---------------------------END-OF-HEADER------------------------------
File    : SEGGER_RTT_Syscalls_GCC.c
Purpose : Low-level functions for using printf() via RTT in GCC.
          To use RTT for printf output, include this file in your
          application.
Revision: $Rev: 4351 $
----------------------------------------------------------------------
*/
#if (defined __GNUC__) && !(defined __SES_ARM) && !(defined __CROSSWORKS_ARM)

#include <reent.h>  // required for _write_r
#include "SEGGER_RTT.h"


/*********************************************************************
*
*       Types
*
**********************************************************************
*/
//
// If necessary define the _reent struct
// to match the one passed by the used standard library.
//
struct _reent;

/*********************************************************************
*
*       Function prototypes
*
**********************************************************************
*/
int _write(int file, char *ptr, int len);
int _write_r(struct _reent *r, int file, const void *ptr, int len);

/*********************************************************************
*
*       Global functions
*
**********************************************************************
*/

/*********************************************************************
*
*       _write()
*
* Function description
*   Low-level write function.
*   libc subroutines will use this system routine for output to all files,
*   including stdout.
*   Write data via RTT.
*/
int _write(int file, char *ptr, int len) {
  (void) file;  /* Not used, avoid warning */
  SEGGER_RTT_Write(0, ptr, len);
  return len;
}

/*********************************************************************
*
*       _write_r()
*
* Function description
*   Low-level reentrant write function.
*   libc subroutines will use this system routine for output to all files,
*   including stdout.
*   Write data via RTT.
*/
int _write_r(struct _reent *r, int file, const void *ptr, int len) {
  (void) file;  /* Not used, avoid warning */
  (void) r;     /* Not used, avoid warning */
  SEGGER_RTT_Write(0, ptr, len);
  return len;
}

#endif
/****** End Of File *************************************************/