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web-serial-test.html
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web-serial-test.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Web Serial Tester</title>
<style>
body {
font-family: Roboto, sans-serif;
}
#not-supported {
border: 2px solid #c0c000;
background: #ffff80;
border-radius: 4px;
padding: 8px;
}
#not-supported.hidden {
display: none;
}
.readout {
margin: 1em 0;
}
.readout h1 {
line-height: 0.75em;
margin: 0;
font-family: 'Iosevka', monospace;
}
</style>
</head>
<body>
<div id="not-supported">
The Web Serial API is not supported by this browser. Try a recent version of Google Chrome.
</div>
<p>
<button id="connect" onclick="connect()">Connect</button>
</p>
<div class="readout">
Altitude:
<h1 id="altitude">0m</h1>
</div>
<div class="readout">
Heading:
<h1 id="heading">0°</h1>
</div>
<div class="readout">
Airspeed:
<h1 id="airspeed">0 ??</h1>
</div>
<div class="readout">
Latitude:
<h1 id="latitude">0° 0'</h1>
</div>
<div class="readout">
Longitude:
<h1 id="longitude">0° 0'</h1>
</div>
<div class="readout">
<h1 id="satellites">0 satellites connected</h1>
</div>
<script>
if ('serial' in navigator) {
document.getElementById('not-supported').classList.add('hidden');
}
function splitStream(splitOn) {
let buffer = '';
return new TransformStream({
transform(chunk, controller) {
buffer += chunk;
const parts = buffer.split(splitOn);
parts.slice(0, -1).forEach(part => controller.enqueue(part));
buffer = parts[parts.length - 1];
},
flush(controller) {
if (buffer) controller.enqueue(buffer);
}
});
}
function parseJSON() {
return new TransformStream({
transform(chunk, controller) {
controller.enqueue(JSON.parse(chunk));
}
});
}
async function connect() {
const altitude = document.getElementById('altitude'),
heading = document.getElementById('heading'),
airspeed = document.getElementById('airspeed'),
latitude = document.getElementById('latitude'),
longitude = document.getElementById('longitude'),
satellites = document.getElementById('satellites');
const port = await navigator.serial.requestPort();
await port.open({ baudrate: 115200 });
const reader = port.readable.pipeThrough(new TextDecoderStream())
.pipeThrough(splitStream('\n'))
.pipeThrough(parseJSON()).getReader();
while (true) {
try {
const { value, done } = await reader.read();
if (value) {
if (value.hasOwnProperty('altitude')) {
altitude.innerHTML = `${value.altitude}m`;
} else if (value.hasOwnProperty('orientation')) {
heading.innerHTML = `${value.orientation.heading}°`;
} else if (value.hasOwnProperty('position')) {
latitude.innerHTML = `${value.position.latDeg}° ${value.position.latMin}'`;
longitude.innerHTML = `${value.position.longDeg}° ${value.position.longMin}'`;
satellites.innerHTML = `${value.position.satellites} satellites connected`;
} else if (value.hasOwnProperty('airspeed')) {
airspeed.innerHTML = `${value.airspeed} ??`;
}
}
if (done) {
console.log('no more data');
reader.releaseLock();
}
} catch (e) {}
}
}
</script>
</body>
</html>