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 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 * 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 * RTT version: 7.22 *
46 * *
47 **********************************************************************
48
49 ---------------------------END-OF-HEADER------------------------------
50 File : SEGGER_RTT_Syscalls_GCC.c
51 Purpose : Low-level functions for using printf() via RTT in GCC.
52 To use RTT for printf output, include this file in your
53 application.
54 Revision: $Rev: 20755 $
55 ----------------------------------------------------------------------
56 */
57
58 /*
59 * This is to be compatible with other MSDK debug_console.
60 *
61 * When SDK_DEBUGCONSOLE_UART is defined, the toolchain IO functions like
62 * printf, scanf are redirected to RTT.
63 */
64 #if defined(SDK_DEBUGCONSOLE_UART)
65 #if (defined __GNUC__) && !(defined __SES_ARM) && !(defined __CROSSWORKS_ARM) && !(defined __ARMCC_VERSION) && \
66 !(defined __CC_ARM)
67
68 #include <reent.h> // required for _write_r
69 #include "SEGGER_RTT.h"
70
71 /*********************************************************************
72 *
73 * Types
74 *
75 **********************************************************************
76 */
77 //
78 // If necessary define the _reent struct
79 // to match the one passed by the used standard library.
80 //
81 struct _reent;
82
83 /*********************************************************************
84 *
85 * Function prototypes
86 *
87 **********************************************************************
88 */
89 _ssize_t _write(int file, const void *ptr, size_t len);
90 _ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len);
91
92 /*********************************************************************
93 *
94 * Global functions
95 *
96 **********************************************************************
97 */
98
99 /*********************************************************************
100 *
101 * _write()
102 *
103 * Function description
104 * Low-level write function.
105 * libc subroutines will use this system routine for output to all files,
106 * including stdout.
107 * Write data via RTT.
108 */
_write(int file,const void * ptr,size_t len)109 _ssize_t _write(int file, const void *ptr, size_t len)
110 {
111 (void)file; /* Not used, avoid warning */
112 SEGGER_RTT_Write(0, ptr, len);
113 return len;
114 }
115
116 /*********************************************************************
117 *
118 * _write_r()
119 *
120 * Function description
121 * Low-level reentrant write function.
122 * libc subroutines will use this system routine for output to all files,
123 * including stdout.
124 * Write data via RTT.
125 */
_write_r(struct _reent * r,int file,const void * ptr,size_t len)126 _ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len)
127 {
128 (void)file; /* Not used, avoid warning */
129 (void)r; /* Not used, avoid warning */
130 SEGGER_RTT_Write(0, ptr, len);
131 return len;
132 }
133
134 /*********************************************************************
135 *
136 * _read()
137 *
138 * Function description
139 * Low-level read function.
140 * Standard library subroutines will use this system routine
141 * for reading data via RTT.
142 */
_read(int handle,char * buffer,int size)143 _ssize_t _read(int handle, char *buffer, int size)
144 {
145 (void)handle; /* Not used, avoid warning */
146
147 for (int i = 0; i < bufSize; i++)
148 {
149 *buf = SEGGER_RTT_WaitKey();
150 buf++;
151 }
152
153 return bufSize;
154 }
155
156 /*********************************************************************
157 *
158 * __sys_write()
159 *
160 * Function description
161 * Low-level write function used by REDLIB.
162 */
__sys_write(int handle,char * buffer,int size)163 int __sys_write(int handle, char *buffer, int size)
164 {
165 if (NULL == buffer)
166 {
167 /* return -1 if error. */
168 return -1;
169 }
170
171 /* This function only writes to "standard out" and "standard err" for all other file handles it returns failure. */
172 if ((handle != 1) && (handle != 2))
173 {
174 return -1;
175 }
176
177 /* Send data. */
178 SEGGER_RTT_Write(0, (const char *)buffer, size);
179
180 return 0;
181 }
182
183 /*********************************************************************
184 *
185 * _read()
186 *
187 * Function description
188 * Low-level read function, used by REDLIB.
189 * Standard library subroutines will use this system routine
190 * for reading data via RTT.
191 */
__sys_readc(void)192 int __sys_readc(void)
193 {
194 return SEGGER_RTT_WaitKey();
195 }
196
197 #endif
198
199 #endif /* SDK_DEBUGCONSOLE_UART */
200 /****** End Of File *************************************************/
201
