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serialport.js
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serialport.js
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"use strict";
/*global process require exports console */
// Copyright 2011 Chris Williams <chris@iterativedesigns.com>
var util = require('util');
var Buffer = require('buffer').Buffer;
var stream = require('stream');
var fs = require('fs');
var net = require('net');
var serialport_native = require('bindings')('serialport_native.node');
var IOWatcher = process.binding('io_watcher').IOWatcher;
var BAUDRATES = [115200, 57600, 38400, 19200, 9600, 4800, 2400, 1800, 1200, 600, 300, 200, 150, 134, 110, 75, 50];
var DATABITS = [8, 7, 6, 5];
var STOPBITS = [1, 2];
var PARITY = [0, 1, 2];
var FLOWCONTROL = [0, 1];
var parsers = {
raw: function (emitter, buffer) {
emitter.emit("data", buffer);
},
readline: function (delimiter) {
if (typeof delimiter === "undefined" || delimiter === null) { delimiter = "\r"; }
// Delimiter buffer saved in closure
var data = "";
return function (emitter, buffer) {
// Collect data
data += buffer.toString();
// Split collected data by delimiter
var parts = data.split(delimiter)
data = parts.pop();
parts.forEach(function (part, i, array) {
emitter.emit('data', part);
});
};
}
};
// The default options, can be overwritten in the 'SerialPort' constructor
var _options = {
baudrate: 9600,
databits: 8,
stopbits: 1,
parity: 0,
flowcontrol: 0,
buffersize: 255,
parser: parsers.raw
};
function SerialPort(path, options) {
options = options || {};
options.__proto__ = _options;
if (BAUDRATES.indexOf(options.baudrate) == -1) {
throw new Error('Invalid "baudrate": ' + options.baudrate);
}
if (DATABITS.indexOf(options.databits) == -1) {
throw new Error('Invalid "databits": ' + options.databits);
}
if (STOPBITS.indexOf(options.stopbits) == -1) {
throw new Error('Invalid "stopbits": ' + options.stopbits);
}
if (PARITY.indexOf(options.parity) == -1) {
throw new Error('Invalid "parity": ' + options.parity);
}
if (FLOWCONTROL.indexOf(options.flowcontrol) == -1) {
throw new Error('Invalid "flowcontrol": ' + options.flowcontrol);
}
stream.Stream.call(this);
this.port = path;
this.fd = serialport_native.open(this.port, options.baudrate, options.databits, options.stopbits, options.parity, options.flowcontrol);
if (this.fd == -1) {
throw new Error("Could not open serial port");
} else {
this.readStream = fs.createReadStream(this.port,{bufferSize:options.buffersize});
var openCallback = ( function (me) {
return (function (fd) {
me.emit("open",fd);
});
})(this);
var dataCallback = (function (me) {
return (function (buffer) {
options.parser(me, buffer)
});
})(this);
var errorCallback = (function (me) {
return (function (err) {
me.emit("error", err);
});
})(this);
var closeCallback = (function (me) {
return (function () {
me.emit("close");
});
})(this);
var endCallback = (function (me) {
return (function () {
me.emit("end");
});
})(this);
this.readStream.on("open", openCallback);
this.readStream.on("data", dataCallback);
this.readStream.on("error", errorCallback);
this.readStream.on("close", closeCallback);
this.readStream.on("end", endCallback);
}
}
util.inherits(SerialPort, stream.Stream);
SerialPort.prototype.close = function () {
if (this.fd) {
serialport_native.close(this.fd);
this.fd = null;
}
this.readStream.destroy();
};
SerialPort.prototype.write = function (b) {
if (Buffer.isBuffer(b))
serialport_native.write(this.fd, b);
else
serialport_native.write(this.fd, new Buffer(b));
};
SerialPort.prototype.end = function(buf, enc) {
if (buf) {
this.write(buf, enc);
}
this.close();
}
SerialPort.prototype.set_baud_rate = function(baud_rate) {
if (this.fd) {
serialport_native.set_baud_rate(this.fd, baud_rate);
} else {
throw new Error("Can't set baud rate; invalid file descriptor");
}
}
SerialPort.prototype.set_dtr = function(boolean_value) {
if (this.fd) {
serialport_native.set_dtr(this.fd, boolean_value);
} else {
throw new Error("Can't set or clear DTR; invalid file descriptor");
}
}
module.exports.SerialPort = SerialPort;
module.exports.parsers = parsers;