299 lines
8.2 KiB
C++
299 lines
8.2 KiB
C++
// generic.cxx -- generic protocal class
|
|
//
|
|
// Written by Curtis Olson, started November 1999.
|
|
//
|
|
// Copyright (C) 1999 Curtis L. Olson - http://www.flightgear.org/~curt
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License as
|
|
// published by the Free Software Foundation; either version 2 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful, but
|
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
//
|
|
// $Id$
|
|
|
|
|
|
#include <string.h> // strstr()
|
|
#include <stdlib.h> // strtod(), atoi()
|
|
|
|
#include <simgear/debug/logstream.hxx>
|
|
#include <simgear/io/iochannel.hxx>
|
|
#include <simgear/structure/exception.hxx>
|
|
#include <simgear/misc/sg_path.hxx>
|
|
#include <simgear/props/props.hxx>
|
|
#include <simgear/props/props_io.hxx>
|
|
|
|
#include <Main/globals.hxx>
|
|
#include <Main/fg_props.hxx>
|
|
|
|
#include "generic.hxx"
|
|
|
|
|
|
|
|
FGGeneric::FGGeneric(string& config) {
|
|
|
|
string file = config+".xml";
|
|
|
|
SGPath path( globals->get_fg_root() );
|
|
path.append("Protocol");
|
|
path.append(file.c_str());
|
|
SG_LOG(SG_GENERAL, SG_INFO, "Reading communication protocol from "
|
|
<< path.str());
|
|
|
|
SGPropertyNode root;
|
|
try {
|
|
readProperties(path.str(), &root);
|
|
} catch (const sg_exception &e) {
|
|
SG_LOG(SG_GENERAL, SG_ALERT,
|
|
"Unable to load the protocol configuration file");
|
|
return;
|
|
}
|
|
|
|
_out_message.clear();
|
|
SGPropertyNode *output = root.getNode("generic/output");
|
|
if (output)
|
|
read_config(output, _out_message);
|
|
|
|
_in_message.clear();
|
|
SGPropertyNode *input = root.getNode("generic/input");
|
|
if (input)
|
|
read_config(input, _in_message);
|
|
}
|
|
|
|
FGGeneric::~FGGeneric() {
|
|
_out_message.clear();
|
|
_in_message.clear();
|
|
}
|
|
|
|
|
|
// generate the message
|
|
bool FGGeneric::gen_message() {
|
|
|
|
string generic_sentence;
|
|
char tmp[255];
|
|
|
|
double val;
|
|
|
|
for (unsigned int i = 0; i < _out_message.size(); i++) {
|
|
|
|
if (i > 0)
|
|
generic_sentence += var_separator;
|
|
|
|
switch (_out_message[i].type) {
|
|
case FG_INT:
|
|
val = _out_message[i].offset +
|
|
_out_message[i].prop->getIntValue() * _out_message[i].factor;
|
|
snprintf(tmp, 255, _out_message[i].format.c_str(), (int)val);
|
|
break;
|
|
|
|
case FG_BOOL:
|
|
snprintf(tmp, 255, _out_message[i].format.c_str(),
|
|
_out_message[i].prop->getBoolValue());
|
|
break;
|
|
|
|
case FG_DOUBLE:
|
|
val = _out_message[i].offset +
|
|
_out_message[i].prop->getFloatValue() * _out_message[i].factor;
|
|
snprintf(tmp, 255, _out_message[i].format.c_str(), (float)val);
|
|
break;
|
|
|
|
default: // SG_STRING
|
|
snprintf(tmp, 255, _out_message[i].format.c_str(),
|
|
_out_message[i].prop->getStringValue());
|
|
}
|
|
|
|
generic_sentence += tmp;
|
|
}
|
|
|
|
/* After each lot of variables has been added, put the line separator
|
|
* char/string
|
|
*/
|
|
generic_sentence += line_separator;
|
|
|
|
|
|
length = generic_sentence.length();
|
|
strncpy( buf, generic_sentence.c_str(), length );
|
|
|
|
return true;
|
|
}
|
|
|
|
bool FGGeneric::parse_message() {
|
|
char *p2, *p1 = buf;
|
|
double val;
|
|
int i = -1;
|
|
|
|
while ((++i < _in_message.size()) &&
|
|
p1 && strcmp(p1, line_separator.c_str())) {
|
|
|
|
p2 = strstr(p1, var_separator.c_str());
|
|
if (p2) {
|
|
*p2 = 0;
|
|
p2 += var_separator.length();
|
|
}
|
|
|
|
switch (_in_message[i].type) {
|
|
case FG_INT:
|
|
val = _in_message[i].offset + atoi(p1) * _in_message[i].factor;
|
|
_in_message[i].prop->setIntValue((int)val);
|
|
break;
|
|
|
|
case FG_BOOL:
|
|
_in_message[i].prop->setBoolValue( atof(p1) != 0.0 );
|
|
break;
|
|
|
|
case FG_DOUBLE:
|
|
val = _in_message[i].offset + strtod(p1, 0) * _in_message[i].factor;
|
|
_in_message[i].prop->setFloatValue((float)val);
|
|
break;
|
|
|
|
default: // SG_STRING
|
|
_in_message[i].prop->setStringValue(p1);
|
|
}
|
|
|
|
p1 = p2;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
// open hailing frequencies
|
|
bool FGGeneric::open() {
|
|
if ( is_enabled() ) {
|
|
SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel "
|
|
<< "is already in use, ignoring" );
|
|
return false;
|
|
}
|
|
|
|
SGIOChannel *io = get_io_channel();
|
|
|
|
if ( ! io->open( get_direction() ) ) {
|
|
SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
|
|
return false;
|
|
}
|
|
|
|
set_enabled( true );
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// process work for this port
|
|
bool FGGeneric::process() {
|
|
SGIOChannel *io = get_io_channel();
|
|
|
|
if ( get_direction() == SG_IO_OUT ) {
|
|
gen_message();
|
|
if ( ! io->write( buf, length ) ) {
|
|
SG_LOG( SG_IO, SG_WARN, "Error writing data." );
|
|
return false;
|
|
}
|
|
} else if ( get_direction() == SG_IO_IN ) {
|
|
if ( (length = io->readline( buf, FG_MAX_MSG_SIZE )) > 0 ) {
|
|
parse_message();
|
|
} else {
|
|
SG_LOG( SG_IO, SG_ALERT, "Error reading data." );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// close the channel
|
|
bool FGGeneric::close() {
|
|
SGIOChannel *io = get_io_channel();
|
|
|
|
set_enabled( false );
|
|
|
|
if ( ! io->close() ) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void
|
|
FGGeneric::read_config(SGPropertyNode *root, vector<_serial_prot> &msg)
|
|
{
|
|
/* These variables specified in the $FG_ROOT/data/Protocol/xxx.xml
|
|
* file for each format
|
|
*
|
|
* var_sep_string = the string/charachter to place between variables
|
|
* line_sep_string = the string/charachter to place at the end of each
|
|
* lot of variables
|
|
*/
|
|
var_sep_string = root->getStringValue("var_separator");
|
|
line_sep_string = root->getStringValue("line_separator");
|
|
|
|
if ( var_sep_string == "newline" )
|
|
var_separator = '\n';
|
|
else if ( var_sep_string == "tab" )
|
|
var_separator = '\t';
|
|
else if ( var_sep_string == "space" )
|
|
var_separator = ' ';
|
|
else if ( var_sep_string == "formfeed" )
|
|
var_separator = '\f';
|
|
else if ( var_sep_string == "carriagereturn" )
|
|
var_sep_string = '\r';
|
|
else if ( var_sep_string == "verticaltab" )
|
|
var_separator = '\v';
|
|
else
|
|
var_separator = var_sep_string;
|
|
|
|
if ( line_sep_string == "newline" )
|
|
line_separator = '\n';
|
|
else if ( line_sep_string == "tab" )
|
|
line_separator = '\t';
|
|
else if ( line_sep_string == "space" )
|
|
line_separator = ' ';
|
|
else if ( line_sep_string == "formfeed" )
|
|
line_separator = '\f';
|
|
else if ( line_sep_string == "carriagereturn" )
|
|
line_separator = '\r';
|
|
else if ( line_sep_string == "verticaltab" )
|
|
line_separator = '\v';
|
|
else
|
|
line_separator = line_sep_string;
|
|
|
|
|
|
vector<SGPropertyNode_ptr> chunks = root->getChildren("chunk");
|
|
for (unsigned int i = 0; i < chunks.size(); i++) {
|
|
|
|
_serial_prot chunk;
|
|
|
|
// chunk.name = chunks[i]->getStringValue("name");
|
|
chunk.format = chunks[i]->getStringValue("format", "%d");
|
|
chunk.offset = chunks[i]->getDoubleValue("offset");
|
|
chunk.factor = chunks[i]->getDoubleValue("factor", 1.0);
|
|
|
|
string node = chunks[i]->getStringValue("node");
|
|
chunk.prop = fgGetNode(node.c_str(), true);
|
|
|
|
string type = chunks[i]->getStringValue("type");
|
|
if (type == "bool")
|
|
chunk.type = FG_BOOL;
|
|
else if (type == "float")
|
|
chunk.type = FG_DOUBLE;
|
|
else if (type == "string")
|
|
chunk.type = FG_STRING;
|
|
else
|
|
chunk.type = FG_INT;
|
|
|
|
msg.push_back(chunk);
|
|
|
|
}
|
|
|
|
}
|
|
|