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control.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Raspberry Pi RC controller</title>
<style>
.flex-container {
display: -webkit-flex;
display: flex;
}
.control-button {
border: 1px solid black;
text-align: center;
font-size: 300%;
}
.unset {
box-shadow: 0 0 3px red;
}
</style>
<script type="text/ECMAScript">
var optionToId = {
'frequency': 'frequency',
'synchronization_burst_us': 'sync-burst-us',
'synchronization_spacing_us': 'sync-spacing-us',
'total_synchronizations': 'total-syncs',
'signal_burst_us': 'signal-burst-us',
'signal_spacing_us': 'signal-spacing-us',
'forward': 'forward',
'forward_left': 'forward-left',
'forward_right': 'forward-right',
'left': 'left',
'right': 'right',
'reverse': 'reverse',
'reverse_left': 'reverse-left',
'reverse_right': 'reverse-right'
};
var forward = false;
var reverse = false;
var left = false;
var right = false;
function loadFile(file) {
var reader = new FileReader();
reader.onload = function (e) {
try {
var json = JSON.parse(e.target.result);
loadConfig(json);
} catch (error) {
alert('Unable to read JSON: ' + error);
return;
}
};
reader.readAsText(file);
}
function loadConfigFromServer() {
var request = new XMLHttpRequest();
request.onload = function() {
try {
if (this.status === 200) {
var config = JSON.parse(this.responseText);
loadConfig(config);
} else {
config = {};
}
// We might have gotten redirected here from watch.html, in which
// case, the parameters for the directions will be empty. Pop open
// the parameters div so that the user can enter them.
if (config.forward === undefined) {
toggleOptions(true);
}
} catch (error) {
alert('Unable to read JSON: ' + error);
return;
}
};
request.open('GET', window.location.origin + '/parameters.json');
request.send();
}
function loadConfig(config) {
for (var option in optionToId) {
if (optionToId.hasOwnProperty(option)) {
value = config[option];
if (value === undefined) {
// Let the user know that this still needs to be set
document.getElementById(optionToId[option]).classList.add('unset');
} else {
document.getElementById(optionToId[option]).value = value;
}
}
}
}
function handleFileSelect(evt) {
evt.preventDefault();
var file = evt.target.files[0];
loadFile(file);
}
function formatControlMessage() {
var frequency = parseFloat(document.getElementById('frequency').value);
var deadFrequency = frequency > 40 ? 26.995 : 49.830;
var command = [{
'frequency': frequency,
'dead_frequency': deadFrequency,
'burst_us': parseFloat(document.getElementById('sync-burst-us').value),
'spacing_us': parseInt(document.getElementById('sync-spacing-us').value),
'repeats': parseInt(document.getElementById('total-syncs').value)
}];
var forwardCount = forward ? 2 : reverse ? 0 : 1;
var leftCount = left ? 0 : right ? 2 : 1;
var burstIdLookup = [
['reverse-left', 'reverse', 'reverse-right'],
['left', '', 'right'], // Not moving
['forward-left', 'forward', 'forward-right']
];
var burstId = burstIdLookup[forwardCount][leftCount];
if (burstId !== '') {
var burstSignals = parseInt(document.getElementById(burstId).value);
command.push({
'frequency': frequency,
'dead_frequency': deadFrequency,
'burst_us': parseFloat(document.getElementById('signal-burst-us').value),
'spacing_us': parseInt(document.getElementById('sync-spacing-us').value),
'repeats': burstSignals
});
}
return JSON.stringify(command);
}
function sendControlMessage(evt) {
if (evt !== undefined) {
evt.preventDefault();
}
var commandEndPoint = window.location.origin + '/command/';
var xhr = new XMLHttpRequest();
xhr.open('POST', commandEndPoint, true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.onreadystatechange = function() {
if (xhr.readyState === XMLHttpRequest.DONE) {
// Any success code is fine
if (!('' + xhr.status).startsWith('2')) {
writeMessage('Bad response received, HTTP code: ' + xhr.status);
}
}
};
xhr.onerror = function(err) {
writeMessage('There was an error communicating with the backend: ' + err);
};
xhr.send(formatControlMessage());
}
function keyHandler(evt, down) {
evt = evt || window.evt;
var key = evt.key || evt.srcElement || evt.keyCode;
if (key === undefined && evt.changedTouches) {
key = event.changedTouches[0].target;
}
if (key === undefined && evt.type.startsWith('mouse')) {
key = evt.target;
}
var needUpdate = false; // We'll use this to ignore key repeats
if (key === 'ArrowUp' || key === 38 || key === document.getElementById('forward-button')) { // Up
needUpdate = (forward !== down);
forward = down;
} else if (key === 'ArrowDown' || key === 40 || key === document.getElementById('reverse-button')) { // Down
needUpdate = (reverse !== down);
reverse = down;
} else if (key === 'ArrowLeft' || key === 37 || key === document.getElementById('left-button')) { // Left
needUpdate = (left !== down);
left = down;
} else if (key === 'ArrowRight' || key === 39 || key === document.getElementById('right-button')) { // Right
needUpdate = (right !== down);
right = down;
}
if (needUpdate) {
sendControlMessage();
evt.preventDefault();
}
}
function toggleOptions(popOpen) {
var heading = document.getElementById('parameters-heading');
var text = heading.innerText;
var options = document.getElementById('parameters-options');
if (popOpen === undefined) {
if (options.style.display === 'none') {
popOpen = true;
} else {
popOpen = false;
}
}
if (popOpen) {
heading.innerText = text.substr(0, text.length - 1) + String.fromCharCode(0x25BC);
options.style.display = 'block';
} else {
heading.innerText = text.substr(0, text.length - 1) + String.fromCharCode(0x25B2);
options.style.display = 'none';
}
}
var clearMessageTimeoutId = null;
function writeMessage(message) {
var messageElement = document.getElementById('message');
messageElement.innerText = message;
if (clearMessageTimeoutId !== null) {
window.clearTimeout(clearMessageTimeoutId);
}
clearMessageTimeoutId = window.setTimeout(
function() { writeMessage(''); },
2000);
}
function init(){
document.getElementById('parameters-heading').addEventListener('click', toggleOptions);
document.getElementById('parameter-file').addEventListener('change', handleFileSelect);
loadConfigFromServer();
var element;
['forward-button', 'reverse-button', 'left-button', 'right-button'].forEach(function (id) {
var element = document.getElementById(id);
['mousedown', 'touchstart'].forEach(function (action) {
element.addEventListener(action, function (evt) { keyHandler(evt, true); });
});
['mouseup', 'touchend'].forEach(function (action) {
element.addEventListener(action, function (evt) { keyHandler(evt, false); });
});
});
var body = document.getElementById('body');
body.addEventListener('keydown', function (evt) { keyHandler(evt, true); });
body.addEventListener('keyup', function (evt) { keyHandler(evt, false); });
for (var option in optionToId) {
element = document.getElementById(optionToId[option]);
element.addEventListener('focus', function (evt) {
evt.preventDefault();
evt.target.classList.remove('unset');
}.bind(this));
}
}
</script>
</head>
<body id="body" onload="init();">
<h1>Pi-RC controller</h1>
<div class="flex-container" style="height: 200px;">
<div class="flex-container" style="width: 50%; height: 100%; display: block;">
<div id="forward-button" class="control-button" style="height: 50%; width: 100%; line-height: 100px;">↑</div>
<div id="reverse-button" class="control-button" style="height: 50%; width: 100%; line-height: 100px;">↓</div>
</div>
<div class="flex-container" style="width: 50%;">
<div id="left-button" class="control-button" style="height: 100%; width: 50%; line-height: 200px;">←</div>
<div id="right-button" class="control-button" style="height: 100%; width: 50%; line-height: 200px;">→</div>
</div>
</div>
<p id="message"></p>
<h2 id="parameters-heading">Parameters ▼</h2>
<div id="parameters-options" style="display: none;">
<table>
<tr><td><h3>Commands</h3></td></tr>
<tr>
<td>Forward</td>
<td>
<input id="forward" type="number" min="5" max="100" step="1" value="11"/>
</td>
</tr>
<tr>
<td>Forward left</td>
<td>
<input id="forward-left" type="number" min="5" max="100" step="1" value="27"/>
</td>
</tr>
<tr>
<td>Forward right</td>
<td>
<input id="forward-right" type="number" min="5" max="100" step="1" value="33"/>
</td>
</tr>
<tr>
<td>Left</td>
<td>
<input id="left" type="number" min="5" max="100" step="1" value="59"/>
</td>
</tr>
<tr>
<td>Right</td>
<td>
<input id="right" type="number" min="5" max="100" step="1" value="64"/>
</td>
</tr>
<tr>
<td>Reverse</td>
<td>
<input id="reverse" type="number" min="5" max="100" step="1" value="39"/>
</td>
</tr>
<tr>
<td>Reverse left</td>
<td>
<input id="reverse-left" type="number" min="5" max="100" step="1" value="51"/>
</td>
</tr>
<tr>
<td>Reverse right</td>
<td>
<input id="reverse-right" type="number" min="5" max="100" step="1" value="45"/>
</td>
</tr>
<tr><td><h3>Settings</h3></td></tr>
<tr>
<td>Frequency</td>
<td>
<input id="frequency" type="number" min="10" max="100" step="0.005" value="40.0"/>
</td>
</tr>
<tr>
<td>Synchronization burst microseconds</td>
<td>
<input id="sync-burst-us" type="number" min="50" max="10000" step="10" value="1200"/>
</td>
</tr>
<tr>
<td>Synchronization spacing microseconds</td>
<td>
<input id="sync-spacing-us" type="number" min="50" max="10000" step="10" value="400"/>
</td>
</tr>
<tr>
<td>Total synchronizations</td>
<td>
<input id="total-syncs" type="number" min="2" max="10" step="1" value="4"/>
</td>
</tr>
<tr>
<td>Signal burst microseconds</td>
<td>
<input id="signal-burst-us" type="number" min="50" max="10000" step="10" value="400"/>
</td>
</tr>
<tr>
<td>Signal spacing microseconds</td>
<td>
<input id="signal-spacing-us" type="number" min="50" max="10000" step="10" value="400"/>
</td>
</tr>
</table>
</div>
<label for="parameter-file">
<b>Load JSON parameter file</b>
<input id="parameter-file" name="parameter-file" type="file" accept="application/json"/>
</label>
</body>
</html>