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1 | /* |
2 | * This file is part of the libCEC(R) library. | |
3 | * | |
4 | * libCEC(R) is Copyright (C) 2011 Pulse-Eight Limited. All rights reserved. | |
5 | * libCEC(R) is an original work, containing original code. | |
6 | * | |
7 | * libCEC(R) is a trademark of Pulse-Eight Limited. | |
8 | * | |
9 | * This program is dual-licensed; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | * | |
23 | * | |
24 | * Alternatively, you can license this library under a commercial license, | |
25 | * please contact Pulse-Eight Licensing for more information. | |
26 | * | |
27 | * For more information contact: | |
28 | * Pulse-Eight Licensing <license@pulse-eight.com> | |
29 | * http://www.pulse-eight.com/ | |
30 | * http://www.pulse-eight.net/ | |
31 | */ | |
32 | ||
33 | #include "Communication.h" | |
34 | #include "CECParser.h" | |
35 | #include "libPlatform/serialport.h" | |
36 | #include "util/StdString.h" | |
37 | ||
38 | using namespace std; | |
39 | using namespace CEC; | |
40 | ||
41 | CCommunication::CCommunication(CCECParser *parser) : | |
42 | m_parser(parser), | |
43 | m_inbuf(NULL), | |
44 | m_iInbufSize(0), | |
45 | m_iInbufUsed(0), | |
46 | m_bStarted(false), | |
47 | m_bStop(false) | |
48 | { | |
49 | m_port = new CSerialPort; | |
50 | } | |
51 | ||
52 | CCommunication::~CCommunication(void) | |
53 | { | |
54 | m_port->Close(); | |
55 | m_port = NULL; | |
56 | } | |
57 | ||
58 | bool CCommunication::Open(const char *strPort, int iBaudRate /* = 38400 */, int iTimeoutMs /* = 10000 */) | |
59 | { | |
60 | CLockObject lock(&m_commMutex); | |
61 | if (m_bStarted) | |
62 | return false; | |
63 | ||
64 | if (!m_port->Open(strPort, iBaudRate)) | |
65 | { | |
66 | CStdString strError; | |
67 | strError.Format("error opening serial port '%s': %s", strPort, m_port->GetError().c_str()); | |
68 | m_parser->AddLog(CEC_LOG_ERROR, strError); | |
69 | return false; | |
70 | } | |
71 | ||
72 | m_parser->AddLog(CEC_LOG_DEBUG, "connection opened"); | |
73 | ||
74 | //clear any input bytes | |
75 | uint8_t buff[1024]; | |
76 | m_port->Read(buff, sizeof(buff), 50); | |
77 | ||
78 | CCondition::Sleep(CEC_SETTLE_DOWN_TIME); | |
79 | ||
80 | m_bStop = false; | |
81 | m_bStarted = true; | |
82 | if (pthread_create(&m_thread, NULL, (void *(*) (void *))&CCommunication::ReaderThreadHandler, (void *)this) == 0) | |
83 | { | |
84 | m_parser->AddLog(CEC_LOG_DEBUG, "reader thread created"); | |
85 | pthread_detach(m_thread); | |
86 | return true; | |
87 | } | |
88 | else | |
89 | { | |
90 | m_parser->AddLog(CEC_LOG_DEBUG, "could not create a reader thread"); | |
91 | } | |
92 | ||
93 | return false; | |
94 | } | |
95 | ||
96 | void *CCommunication::ReaderThreadHandler(CCommunication *comm) | |
97 | { | |
98 | if (comm) | |
99 | comm->ReaderProcess(); | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
104 | void CCommunication::Close(void) | |
105 | { | |
106 | m_bStop = true; | |
107 | pthread_join(m_thread, NULL); | |
108 | m_port->Close(); | |
109 | } | |
110 | ||
111 | void *CCommunication::ReaderProcess(void) | |
112 | { | |
113 | while (!m_bStop) | |
114 | { | |
115 | if (!ReadFromDevice(250)) | |
116 | { | |
117 | m_bStarted = false; | |
118 | break; | |
119 | } | |
120 | ||
121 | CCondition::Sleep(50); | |
122 | } | |
123 | ||
124 | m_parser->AddLog(CEC_LOG_DEBUG, "reader thread terminated"); | |
125 | ||
126 | CLockObject lock(&m_commMutex); | |
127 | m_bStarted = false; | |
128 | return NULL; | |
129 | } | |
130 | ||
131 | bool CCommunication::ReadFromDevice(int iTimeout) | |
132 | { | |
133 | uint8_t buff[1024]; | |
134 | CLockObject lock(&m_commMutex); | |
135 | int iBytesRead = m_port->Read(buff, sizeof(buff), iTimeout); | |
136 | lock.Leave(); | |
137 | if (iBytesRead < 0) | |
138 | { | |
139 | CStdString strError; | |
140 | strError.Format("error reading from serial port: %s", m_port->GetError().c_str()); | |
141 | m_parser->AddLog(CEC_LOG_ERROR, strError); | |
142 | return false; | |
143 | } | |
144 | else if (iBytesRead > 0) | |
145 | AddData(buff, iBytesRead); | |
146 | ||
147 | return true; | |
148 | } | |
149 | ||
150 | void CCommunication::AddData(uint8_t *data, int iLen) | |
151 | { | |
152 | CLockObject lock(&m_bufferMutex); | |
153 | if (iLen + m_iInbufUsed > m_iInbufSize) | |
154 | { | |
155 | m_iInbufSize = iLen + m_iInbufUsed; | |
156 | m_inbuf = (uint8_t*)realloc(m_inbuf, m_iInbufSize); | |
157 | } | |
158 | ||
159 | memcpy(m_inbuf + m_iInbufUsed, data, iLen); | |
160 | m_iInbufUsed += iLen; | |
161 | lock.Leave(); | |
162 | m_condition.Signal(); | |
163 | } | |
164 | ||
165 | bool CCommunication::Write(const cec_frame &data) | |
166 | { | |
167 | CLockObject lock(&m_commMutex); | |
168 | ||
169 | if (m_port->Write(data) != data.size()) | |
170 | { | |
171 | CStdString strError; | |
172 | strError.Format("error writing to serial port: %s", m_port->GetError().c_str()); | |
173 | m_parser->AddLog(CEC_LOG_ERROR, strError); | |
174 | return false; | |
175 | } | |
176 | ||
177 | m_parser->AddLog(CEC_LOG_DEBUG, "command sent"); | |
178 | return true; | |
179 | } | |
180 | ||
181 | bool CCommunication::Read(cec_frame &msg, int iTimeout) | |
182 | { | |
183 | CLockObject lock(&m_bufferMutex); | |
184 | ||
60fa4578 | 185 | if (m_iInbufUsed < 1) |
a8f0bd18 LOK |
186 | m_condition.Wait(&m_bufferMutex, iTimeout); |
187 | ||
188 | if (m_iInbufUsed < 1) | |
189 | return false; | |
190 | ||
191 | //search for first start of message | |
192 | int startpos = -1; | |
193 | for (int i = 0; i < m_iInbufUsed; i++) | |
194 | { | |
195 | if (m_inbuf[i] == MSGSTART) | |
196 | { | |
197 | startpos = i; | |
198 | break; | |
199 | } | |
200 | } | |
201 | ||
202 | if (startpos == -1) | |
203 | return false; | |
204 | ||
205 | //move anything from the first start of message to the beginning of the buffer | |
206 | if (startpos > 0) | |
207 | { | |
208 | memmove(m_inbuf, m_inbuf + startpos, m_iInbufUsed - startpos); | |
209 | m_iInbufUsed -= startpos; | |
210 | } | |
211 | ||
212 | if (m_iInbufUsed < 2) | |
213 | return false; | |
214 | ||
215 | //look for end of message | |
216 | startpos = -1; | |
217 | int endpos = -1; | |
218 | for (int i = 1; i < m_iInbufUsed; i++) | |
219 | { | |
220 | if (m_inbuf[i] == MSGEND) | |
221 | { | |
222 | endpos = i; | |
223 | break; | |
224 | } | |
225 | else if (m_inbuf[i] == MSGSTART) | |
226 | { | |
227 | startpos = i; | |
228 | break; | |
229 | } | |
230 | } | |
231 | ||
232 | if (startpos > 0) //we found a msgstart before msgend, this is not right, remove | |
233 | { | |
234 | m_parser->AddLog(CEC_LOG_ERROR, "received MSGSTART before MSGEND"); | |
235 | memmove(m_inbuf, m_inbuf + startpos, m_iInbufUsed - startpos); | |
236 | m_iInbufUsed -= startpos; | |
237 | return false; | |
238 | } | |
239 | ||
240 | if (endpos > 0) //found a MSGEND | |
241 | { | |
242 | msg.clear(); | |
243 | bool isesc = false; | |
244 | for (int i = 1; i < endpos; i++) | |
245 | { | |
246 | if (isesc) | |
247 | { | |
248 | msg.push_back(m_inbuf[i] + (uint8_t)ESCOFFSET); | |
249 | isesc = false; | |
250 | } | |
251 | else if (m_inbuf[i] == MSGESC) | |
252 | { | |
253 | isesc = true; | |
254 | } | |
255 | else | |
256 | { | |
257 | msg.push_back(m_inbuf[i]); | |
258 | } | |
259 | } | |
260 | ||
261 | if (endpos + 1 < m_iInbufUsed) | |
262 | memmove(m_inbuf, m_inbuf + endpos + 1, m_iInbufUsed - endpos - 1); | |
263 | ||
264 | m_iInbufUsed -= endpos + 1; | |
265 | ||
266 | return true; | |
267 | } | |
268 | ||
269 | return false; | |
270 | } | |
271 | ||
272 | std::string CCommunication::GetError(void) const | |
273 | { | |
274 | return m_port->GetError(); | |
275 | } |