pxt-calliope/clients/chrome/background.js

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JavaScript
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var connections = [];
// A list of "ports", i.e. connected clients (such as web pages). Multiple web
// pages can connect to our service: they all receive the same data.
var ports = [];
function byPath(path) {
return connections.filter(function (x) { return x.path == path; });
}
function byId(id) {
return connections.filter(function (x) { return x.id == id; });
}
function onReceive(data, id) {
if (ports.length == 0)
return;
var view = new DataView(data);
var decoder = new TextDecoder("utf-8");
var decodedString = decoder.decode(view);
ports.forEach(function (port) { return port.postMessage({
type: "serial",
data: decodedString,
id: id
}); });
}
function findNewDevices() {
chrome.serial.getDevices(function (serialPorts) {
serialPorts.forEach(function (serialPort) {
if (byPath(serialPort.path).length == 0 &&
serialPort.displayName == "mbed Serial Port") {
chrome.serial.connect(serialPort.path, { bitrate: 115200 }, function (info) {
// In case the [connect] operation takes more than five seconds...
if (info && byPath(serialPort.path).length == 0)
connections.push({
id: info.connectionId,
path: serialPort.path
});
});
}
});
});
}
function main() {
// Register new clients in the [ports] global variable.
chrome.runtime.onConnectExternal.addListener(function (port) {
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if (/^(micro:bit|touchdevelop|yelm|pxt|codemicrobit|codethemicrobit|pxt.microbit.org)$/.test(port.name)) {
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ports.push(port);
port.onDisconnect.addListener(function () {
ports = ports.filter(function (x) { return x != port; });
});
}
});
// When receiving data for one of the connections that we're tracking, forward
// it to all connected clients.
chrome.serial.onReceive.addListener(function (info) {
if (byId(info.connectionId).length > 0)
onReceive(info.data, info.connectionId);
});
// When it looks like we've been disconnected, drop the corresponding
// connection object from the [connections] global variable.
chrome.serial.onReceiveError.addListener(function (info) {
if (info.error == "system_error" || info.error == "disconnected" || info.error == "device_lost")
connections = connections.filter(function (x) { return x.id != info.connectionId; });
});
// Probe serial connections at regular intervals. In case we find an mbed port
// we haven't yet connected to, connect to it.
setInterval(findNewDevices, 5000);
findNewDevices();
}
document.addEventListener("DOMContentLoaded", main);