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| 1. /* minicom.cpp
2. A simple demonstration minicom client with Boost asio
3.
4. Parameters:
5. baud rate
6. serial port (eg /dev/ttyS0 or COM1)
7.
8. To end the application, send Ctrl-C on standard input
9. */
10.
11. #include <deque>
12. #include <iostream>
13. #include <boost/bind.hpp>
14. #include <boost/asio.hpp>
15. #include <boost/asio/serial_port.hpp>
16. #include <boost/thread.hpp>
17. #include <boost/lexical_cast.hpp>
18. #include <boost/date_time/posix_time/posix_time_types.hpp>
19.
20. #ifdef POSIX
21. #include <termios.h>
22. #endif
23.
24. using namespace std;
25.
26. class minicom_client
27. {
28. public:
29. minicom_client(boost::asio::io_service& io_service, unsigned int baud, const string& device)
30. : active_(true),
31. io_service_(io_service),
32. serialPort(io_service, device)
33. {
34. if (!serialPort.is_open())
35. {
36. cerr << "Failed to open serial port\n";
37. return;
38. }
39. boost::asio::serial_port_base::baud_rate baud_option(baud);
40. serialPort.set_option(baud_option); // set the baud rate after the port has been opened
41. read_start();
42. }
43.
44. void write(const char msg) // pass the write data to the do_write function via the io service in the other thread
45. {
46. io_service_.post(boost::bind(&minicom_client::do_write, this, msg));
47. }
48.
49. void close() // call the do_close function via the io service in the other thread
50. {
51. io_service_.post(boost::bind(&minicom_client::do_close, this, boost::system::error_code()));
52. }
53.
54. bool active() // return true if the socket is still active
55. {
56. return active_;
57. }
58.
59. private:
60.
61. static const int max_read_length = 512; // maximum amount of data to read in one operation
62.
63. void read_start(void)
64. { // Start an asynchronous read and call read_complete when it completes or fails
65. serialPort.async_read_some(boost::asio::buffer(read_msg_, max_read_length),
66. boost::bind(&minicom_client::read_complete,
67. this,
68. boost::asio::placeholders::error,
69. boost::asio::placeholders::bytes_transferred));
70. }
71.
72. void read_complete(const boost::system::error_code& error, size_t bytes_transferred)
73. { // the asynchronous read operation has now completed or failed and returned an error
74. if (!error)
75. { // read completed, so process the data
76. cout.write(read_msg_, bytes_transferred); // echo to standard output
77. read_start(); // start waiting for another asynchronous read again
78. }
79. else
80. do_close(error);
81. }
82.
83. void do_write(const char msg)
84. { // callback to handle write call from outside this class
85. bool write_in_progress = !write_msgs_.empty(); // is there anything currently being written?
86. write_msgs_.push_back(msg); // store in write buffer
87. if (!write_in_progress) // if nothing is currently being written, then start
88. write_start();
89. }
90.
91. void write_start(void)
92. { // Start an asynchronous write and call write_complete when it completes or fails
93. boost::asio::async_write(serialPort,
94. boost::asio::buffer(&write_msgs_.front(), 1),
95. boost::bind(&minicom_client::write_complete,
96. this,
97. boost::asio::placeholders::error));
98. }
99.
100. void write_complete(const boost::system::error_code& error)
101. { // the asynchronous read operation has now completed or failed and returned an error
102. if (!error)
103. { // write completed, so send next write data
104. write_msgs_.pop_front(); // remove the completed data
105. if (!write_msgs_.empty()) // if there is anthing left to be written
106. write_start(); // then start sending the next item in the buffer
107. }
108. else
109. do_close(error);
110. }
111.
112. void do_close(const boost::system::error_code& error)
113. { // something has gone wrong, so close the socket & make this object inactive
114. if (error == boost::asio::error::operation_aborted) // if this call is the result of a timer cancel()
115. return; // ignore it because the connection cancelled the timer
116. if (error)
117. cerr << "Error: " << error.message() << endl; // show the error message
118. else
119. cout << "Error: Connection did not succeed.\n";
120. cout << "Press Enter to exit\n";
121. serialPort.close();
122. active_ = false;
123. }
124.
125. private:
126. bool active_; // remains true while this object is still operating
127. boost::asio::io_service& io_service_; // the main IO service that runs this connection
128. boost::asio::serial_port serialPort; // the serial port this instance is connected to
129. char read_msg_[max_read_length]; // data read from the socket
130. deque<char> write_msgs_; // buffered write data
131. };
132.
133. int main(int argc, char* argv[])
134. {
135. // on Unix POSIX based systems, turn off line buffering of input, so cin.get() returns after every keypress
136. // On other systems, you'll need to look for an equivalent
137. #ifdef POSIX
138. termios stored_settings;
139. tcgetattr(0, &stored_settings);
140. termios new_settings = stored_settings;
141. new_settings.c_lflag &= (~ICANON);
142. new_settings.c_lflag &= (~ISIG); // don't automatically handle control-C
143. tcsetattr(0, TCSANOW, &new_settings);
144. #endif
145. try
146. {
147. if (argc != 3)
148. {
149. cerr << "Usage: minicom <baud> <device>\n";
150. return 1;
151. }
152. boost::asio::io_service io_service;
153. // define an instance of the main class of this program
154. minicom_client c(io_service, boost::lexical_cast<unsigned int>(argv[1]), argv[2]);
155. // run the IO service as a separate thread, so the main thread can block on standard input
156. boost::thread t(boost::bind(&boost::asio::io_service::run, &io_service));
157. while (c.active()) // check the internal state of the connection to make sure it's still running
158. {
159. char ch;
160. cin.get(ch); // blocking wait for standard input
161. if (ch == 3) // ctrl-C to end program
162. break;
163. c.write(ch);
164. }
165. c.close(); // close the minicom client connection
166. t.join(); // wait for the IO service thread to close
167. }
168. catch (exception& e)
169. {
170. cerr << "Exception: " << e.what() << "\n";
171. }
172. #ifdef POSIX // restore default buffering of standard input
173. tcsetattr(0, TCSANOW, &stored_settings);
174. #endif
175. return 0;
176. } |
