1 /*********************************************************************
2 * SEGGER Microcontroller GmbH *
3 * Solutions for real time microcontroller applications *
4 **********************************************************************
5 * *
6 * (c) 1995 - 2018 SEGGER Microcontroller GmbH *
7 * *
8 * www.segger.com Support: support@segger.com *
9 * *
10 **********************************************************************
11 * *
12 * SEGGER RTT * Real Time Transfer for embedded targets *
13 * *
14 **********************************************************************
15 * *
16 * All rights reserved. *
17 * *
18 * SEGGER strongly recommends to not make any changes *
19 * to or modify the source code of this software in order to stay *
20 * compatible with the RTT protocol and J-Link. *
21 * *
22 * Redistribution and use in source and binary forms, with or *
23 * without modification, are permitted provided that the following *
24 * conditions are met: *
25 * *
26 * o Redistributions of source code must retain the above copyright *
27 * notice, this list of conditions and the following disclaimer. *
28 * *
29 * o Redistributions in binary form must reproduce the above *
30 * copyright notice, this list of conditions and the following *
31 * disclaimer in the documentation and/or other materials provided *
32 * with the distribution. *
33 * *
34 * o Neither the name of SEGGER Microcontroller GmbH *
35 * nor the names of its contributors may be used to endorse or *
36 * promote products derived from this software without specific *
37 * prior written permission. *
38 * *
39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
40 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
41 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
42 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
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47 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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50 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
51 * DAMAGE. *
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53 **********************************************************************
54 ---------------------------END-OF-HEADER------------------------------
55 File : SEGGER_RTT_Syscalls_GCC.c
56 Purpose : Low-level functions for using printf() via RTT in GCC.
57 To use RTT for printf output, include this file in your
58 application.
59 Revision: $Rev: 9599 $
60 ----------------------------------------------------------------------
61 */
62 #if (defined __GNUC__) && !(defined __SES_ARM) && !(defined __CROSSWORKS_ARM)
63
64 #include <reent.h> // required for _write_r
65 #include "SEGGER_RTT.h"
66
67
68 /*********************************************************************
69 *
70 * Types
71 *
72 **********************************************************************
73 */
74 //
75 // If necessary define the _reent struct
76 // to match the one passed by the used standard library.
77 //
78 struct _reent;
79
80 /*********************************************************************
81 *
82 * Function prototypes
83 *
84 **********************************************************************
85 */
86 int _write(int file, char *ptr, int len);
87 int _write_r(struct _reent *r, int file, const void *ptr, int len);
88
89 /*********************************************************************
90 *
91 * Global functions
92 *
93 **********************************************************************
94 */
95
96 /*********************************************************************
97 *
98 * _write()
99 *
100 * Function description
101 * Low-level write function.
102 * libc subroutines will use this system routine for output to all files,
103 * including stdout.
104 * Write data via RTT.
105 */
_write(int file,char * ptr,int len)106 int _write(int file, char *ptr, int len) {
107 (void) file; /* Not used, avoid warning */
108 SEGGER_RTT_Write(0, ptr, len);
109 return len;
110 }
111
112 /*********************************************************************
113 *
114 * _write_r()
115 *
116 * Function description
117 * Low-level reentrant write function.
118 * libc subroutines will use this system routine for output to all files,
119 * including stdout.
120 * Write data via RTT.
121 */
_write_r(struct _reent * r,int file,const void * ptr,int len)122 int _write_r(struct _reent *r, int file, const void *ptr, int len) {
123 (void) file; /* Not used, avoid warning */
124 (void) r; /* Not used, avoid warning */
125 SEGGER_RTT_Write(0, ptr, len);
126 return len;
127 }
128
129 #endif
130 /****** End Of File *************************************************/
131
