1 /*********************************************************************
2 * SEGGER Microcontroller GmbH *
3 * The Embedded Experts *
4 **********************************************************************
5 * *
6 * (c) 1995 - 2021 SEGGER Microcontroller GmbH *
7 * *
8 * www.segger.com Support: support@segger.com *
9 * *
10 **********************************************************************
11 * *
12 * SEGGER SystemView * Real-time application analysis *
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 SystemView and 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 * condition is met: *
25 * *
26 * o Redistributions of source code must retain the above copyright *
27 * notice, this condition and the following disclaimer. *
28 * *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
32 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
33 * DISCLAIMED. IN NO EVENT SHALL SEGGER Microcontroller BE LIABLE FOR *
34 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
35 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT *
36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
37 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
38 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE *
40 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
41 * DAMAGE. *
42 * *
43 **********************************************************************
44 * *
45 * SystemView version: 3.40 *
46 * *
47 **********************************************************************
48 ---------------------------END-OF-HEADER------------------------------
49 File : SEGGER_RTT_Syscalls_GCC.c
50 Purpose : Low-level functions for using printf() via RTT in GCC.
51 To use RTT for printf output, include this file in your
52 application.
53 Revision: $Rev: 24316 $
54 ----------------------------------------------------------------------
55 */
56 #if (defined __GNUC__) && !(defined __SES_ARM) && !(defined __CROSSWORKS_ARM) && !(defined __ARMCC_VERSION) && !(defined __CC_ARM)
57
58 #include <reent.h> // required for _write_r
59 #include "SEGGER_RTT.h"
60
61
62 /*********************************************************************
63 *
64 * Types
65 *
66 **********************************************************************
67 */
68 //
69 // If necessary define the _reent struct
70 // to match the one passed by the used standard library.
71 //
72 struct _reent;
73
74 /*********************************************************************
75 *
76 * Function prototypes
77 *
78 **********************************************************************
79 */
80 _ssize_t _write (int file, const void *ptr, size_t len);
81 _ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len);
82
83 /*********************************************************************
84 *
85 * Global functions
86 *
87 **********************************************************************
88 */
89
90 /*********************************************************************
91 *
92 * _write()
93 *
94 * Function description
95 * Low-level write function.
96 * libc subroutines will use this system routine for output to all files,
97 * including stdout.
98 * Write data via RTT.
99 */
_write(int file,const void * ptr,size_t len)100 _ssize_t _write(int file, const void *ptr, size_t len) {
101 (void) file; /* Not used, avoid warning */
102 SEGGER_RTT_Write(0, ptr, len);
103 return len;
104 }
105
106 /*********************************************************************
107 *
108 * _write_r()
109 *
110 * Function description
111 * Low-level reentrant write function.
112 * libc subroutines will use this system routine for output to all files,
113 * including stdout.
114 * Write data via RTT.
115 */
_write_r(struct _reent * r,int file,const void * ptr,size_t len)116 _ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len) {
117 (void) file; /* Not used, avoid warning */
118 (void) r; /* Not used, avoid warning */
119 SEGGER_RTT_Write(0, ptr, len);
120 return len;
121 }
122
123 #endif
124 /****** End Of File *************************************************/
125
