1 // sg_serial.cxx -- Serial I/O routines
3 // Written by Curtis Olson, started November 1999.
5 // Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <simgear/compiler.h>
28 #include <simgear/debug/logstream.hxx>
29 #include <simgear/serial/serial.hxx>
31 #include "sg_serial.hxx"
36 SGSerial::SGSerial( const string& device_name, const string& baud_rate ) :
39 set_type( sgSerialType );
45 SGSerial::~SGSerial() {
49 // open the serial port based on specified direction
50 bool SGSerial::open( const SGProtocolDir d ) {
53 if ( ! port.open_port( device ) ) {
54 FG_LOG( FG_IO, FG_ALERT, "Error opening device: " << device );
58 // cout << "fd = " << port.fd << endl;
60 if ( ! port.set_baud( atoi( baud.c_str() ) ) ) {
61 FG_LOG( FG_IO, FG_ALERT, "Error setting baud: " << baud );
69 // Read data from port. If we don't get enough data, save what we did
70 // get in the save buffer and return 0. The save buffer will be
71 // prepended to subsequent reads until we get as much as is requested.
73 int SGSerial::read( char *buf, int length ) {
76 // read a chunk, keep in the save buffer until we have the
77 // requested amount read
79 char *buf_ptr = save_buf + save_len;
80 result = port.read_port( buf_ptr, length - save_len );
82 if ( result + save_len == length ) {
83 strncpy( buf, save_buf, length );
93 // read data from port
94 int SGSerial::readline( char *buf, int length ) {
97 // read a chunk, keep in the save buffer until we have the
98 // requested amount read
100 char *buf_ptr = save_buf + save_len;
101 result = port.read_port( buf_ptr, SG_IO_MAX_MSG_SIZE - save_len );
104 // look for the end of line in save_buf
106 for ( i = 0; i < save_len && save_buf[i] != '\n'; ++i );
107 if ( save_buf[i] == '\n' ) {
110 // no end of line yet
114 // we found an end of line
116 // copy to external buffer
117 strncpy( buf, save_buf, result );
119 FG_LOG( FG_IO, FG_INFO, "fg_serial line = " << buf );
122 for ( i = result; i < save_len; ++i ) {
123 save_buf[ i - result ] = save_buf[i];
131 // write data to port
132 int SGSerial::write( const char *buf, const int length ) {
133 int result = port.write_port( buf, length );
135 if ( result != length ) {
136 FG_LOG( FG_IO, FG_ALERT, "Error writing data: " << device );
143 // write null terminated string to port
144 int SGSerial::writestring( const char *str ) {
145 int length = strlen( str );
146 return write( str, length );
151 bool SGSerial::close() {
152 if ( ! port.close_port() ) {