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Add CW/Morse code decoder mode
New signal mode for decoding Morse code (CW) transmissions via SDR. Includes route blueprint, utility decoder, frontend UI, and tests. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Smittix
379
static/js/modes/morse.js
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379
static/js/modes/morse.js
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/**
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* Morse Code (CW) decoder module.
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*
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* IIFE providing start/stop controls, SSE streaming, scope canvas,
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* decoded text display, and export capabilities.
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*/
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var MorseMode = (function () {
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'use strict';
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var state = {
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running: false,
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initialized: false,
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eventSource: null,
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charCount: 0,
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decodedLog: [], // { timestamp, morse, char }
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};
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// Scope state
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var scopeCtx = null;
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var scopeAnim = null;
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var scopeHistory = [];
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var SCOPE_HISTORY_LEN = 300;
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var scopeThreshold = 0;
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var scopeToneOn = false;
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// ---- Initialization ----
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function init() {
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if (state.initialized) {
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checkStatus();
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return;
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}
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state.initialized = true;
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checkStatus();
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}
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function destroy() {
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disconnectSSE();
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stopScope();
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}
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// ---- Status ----
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function checkStatus() {
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fetch('/morse/status')
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.then(function (r) { return r.json(); })
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.then(function (data) {
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if (data.running) {
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state.running = true;
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updateUI(true);
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connectSSE();
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startScope();
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} else {
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state.running = false;
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updateUI(false);
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}
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})
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.catch(function () {});
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}
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// ---- Start / Stop ----
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function start() {
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if (state.running) return;
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var payload = {
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frequency: document.getElementById('morseFrequency').value || '14.060',
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gain: document.getElementById('morseGain').value || '0',
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ppm: document.getElementById('morsePPM').value || '0',
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device: document.getElementById('morseDevice').value || '0',
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sdr_type: document.getElementById('morseSdrType').value || 'rtlsdr',
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tone_freq: document.getElementById('morseToneFreq').value || '700',
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wpm: document.getElementById('morseWpm').value || '15',
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bias_t: document.getElementById('morseBiasT').checked,
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};
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fetch('/morse/start', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify(payload),
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})
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.then(function (r) { return r.json(); })
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.then(function (data) {
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if (data.status === 'started') {
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state.running = true;
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state.charCount = 0;
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state.decodedLog = [];
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updateUI(true);
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connectSSE();
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startScope();
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clearDecodedText();
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} else {
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alert('Error: ' + (data.message || 'Unknown error'));
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}
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})
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.catch(function (err) {
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alert('Failed to start Morse decoder: ' + err);
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});
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}
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function stop() {
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fetch('/morse/stop', { method: 'POST' })
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.then(function (r) { return r.json(); })
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.then(function () {
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state.running = false;
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updateUI(false);
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disconnectSSE();
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stopScope();
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})
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.catch(function () {});
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}
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// ---- SSE ----
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function connectSSE() {
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disconnectSSE();
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var es = new EventSource('/morse/stream');
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es.onmessage = function (e) {
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try {
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var msg = JSON.parse(e.data);
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handleMessage(msg);
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} catch (_) {}
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};
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es.onerror = function () {
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// Reconnect handled by browser
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};
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state.eventSource = es;
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}
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function disconnectSSE() {
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if (state.eventSource) {
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state.eventSource.close();
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state.eventSource = null;
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}
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}
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function handleMessage(msg) {
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var type = msg.type;
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if (type === 'scope') {
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// Update scope data
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var amps = msg.amplitudes || [];
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for (var i = 0; i < amps.length; i++) {
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scopeHistory.push(amps[i]);
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if (scopeHistory.length > SCOPE_HISTORY_LEN) {
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scopeHistory.shift();
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}
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}
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scopeThreshold = msg.threshold || 0;
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scopeToneOn = msg.tone_on || false;
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} else if (type === 'morse_char') {
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appendChar(msg.char, msg.morse, msg.timestamp);
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} else if (type === 'morse_space') {
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appendSpace();
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} else if (type === 'status') {
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if (msg.status === 'stopped') {
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state.running = false;
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updateUI(false);
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disconnectSSE();
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stopScope();
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}
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} else if (type === 'error') {
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console.error('Morse error:', msg.text);
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}
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}
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// ---- Decoded text ----
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function appendChar(ch, morse, timestamp) {
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state.charCount++;
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state.decodedLog.push({ timestamp: timestamp, morse: morse, char: ch });
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var panel = document.getElementById('morseDecodedText');
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if (!panel) return;
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var span = document.createElement('span');
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span.className = 'morse-char';
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span.textContent = ch;
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span.title = morse + ' (' + timestamp + ')';
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panel.appendChild(span);
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// Auto-scroll
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panel.scrollTop = panel.scrollHeight;
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// Update count
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var countEl = document.getElementById('morseCharCount');
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if (countEl) countEl.textContent = state.charCount + ' chars';
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}
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function appendSpace() {
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var panel = document.getElementById('morseDecodedText');
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if (!panel) return;
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var span = document.createElement('span');
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span.className = 'morse-word-space';
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span.textContent = ' ';
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panel.appendChild(span);
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}
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function clearDecodedText() {
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var panel = document.getElementById('morseDecodedText');
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if (panel) panel.innerHTML = '';
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state.charCount = 0;
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state.decodedLog = [];
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var countEl = document.getElementById('morseCharCount');
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if (countEl) countEl.textContent = '0 chars';
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}
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// ---- Scope canvas ----
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function startScope() {
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var canvas = document.getElementById('morseScopeCanvas');
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if (!canvas) return;
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var dpr = window.devicePixelRatio || 1;
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var rect = canvas.getBoundingClientRect();
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canvas.width = rect.width * dpr;
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canvas.height = 120 * dpr;
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canvas.style.height = '120px';
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scopeCtx = canvas.getContext('2d');
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scopeCtx.scale(dpr, dpr);
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scopeHistory = [];
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function draw() {
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if (!scopeCtx) return;
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var w = rect.width;
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var h = 120;
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scopeCtx.fillStyle = '#0a0e14';
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scopeCtx.fillRect(0, 0, w, h);
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if (scopeHistory.length === 0) {
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scopeAnim = requestAnimationFrame(draw);
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return;
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}
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// Find max for normalization
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var maxVal = 0;
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for (var i = 0; i < scopeHistory.length; i++) {
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if (scopeHistory[i] > maxVal) maxVal = scopeHistory[i];
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}
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if (maxVal === 0) maxVal = 1;
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var barW = w / SCOPE_HISTORY_LEN;
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var threshNorm = scopeThreshold / maxVal;
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// Draw amplitude bars
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for (var j = 0; j < scopeHistory.length; j++) {
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var norm = scopeHistory[j] / maxVal;
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var barH = norm * (h - 10);
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var x = j * barW;
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var y = h - barH;
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// Green if above threshold, gray if below
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if (scopeHistory[j] > scopeThreshold) {
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scopeCtx.fillStyle = '#00ff88';
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} else {
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scopeCtx.fillStyle = '#334455';
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}
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scopeCtx.fillRect(x, y, Math.max(barW - 1, 1), barH);
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}
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// Draw threshold line
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if (scopeThreshold > 0) {
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var threshY = h - (threshNorm * (h - 10));
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scopeCtx.strokeStyle = '#ff4444';
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scopeCtx.lineWidth = 1;
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scopeCtx.setLineDash([4, 4]);
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scopeCtx.beginPath();
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scopeCtx.moveTo(0, threshY);
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scopeCtx.lineTo(w, threshY);
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scopeCtx.stroke();
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scopeCtx.setLineDash([]);
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}
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// Tone indicator
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if (scopeToneOn) {
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scopeCtx.fillStyle = '#00ff88';
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scopeCtx.beginPath();
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scopeCtx.arc(w - 12, 12, 5, 0, Math.PI * 2);
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scopeCtx.fill();
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}
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scopeAnim = requestAnimationFrame(draw);
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}
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draw();
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}
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function stopScope() {
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if (scopeAnim) {
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cancelAnimationFrame(scopeAnim);
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scopeAnim = null;
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}
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scopeCtx = null;
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}
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// ---- Export ----
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function exportTxt() {
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var text = state.decodedLog.map(function (e) { return e.char; }).join('');
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downloadFile('morse_decoded.txt', text, 'text/plain');
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}
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function exportCsv() {
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var lines = ['timestamp,morse,character'];
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state.decodedLog.forEach(function (e) {
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lines.push(e.timestamp + ',"' + e.morse + '",' + e.char);
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});
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downloadFile('morse_decoded.csv', lines.join('\n'), 'text/csv');
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}
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function copyToClipboard() {
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var text = state.decodedLog.map(function (e) { return e.char; }).join('');
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navigator.clipboard.writeText(text).then(function () {
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var btn = document.getElementById('morseCopyBtn');
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if (btn) {
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var orig = btn.textContent;
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btn.textContent = 'Copied!';
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setTimeout(function () { btn.textContent = orig; }, 1500);
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}
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});
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}
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function downloadFile(filename, content, type) {
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var blob = new Blob([content], { type: type });
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var url = URL.createObjectURL(blob);
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var a = document.createElement('a');
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a.href = url;
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a.download = filename;
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a.click();
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URL.revokeObjectURL(url);
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}
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// ---- UI ----
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function updateUI(running) {
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var startBtn = document.getElementById('morseStartBtn');
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var stopBtn = document.getElementById('morseStopBtn');
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var indicator = document.getElementById('morseStatusIndicator');
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var statusText = document.getElementById('morseStatusText');
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if (startBtn) startBtn.style.display = running ? 'none' : 'block';
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if (stopBtn) stopBtn.style.display = running ? 'block' : 'none';
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if (indicator) {
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indicator.style.background = running ? '#00ff88' : 'var(--text-dim)';
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}
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if (statusText) {
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statusText.textContent = running ? 'Listening' : 'Standby';
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}
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}
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function setFreq(mhz) {
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var el = document.getElementById('morseFrequency');
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if (el) el.value = mhz;
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}
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// ---- Public API ----
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return {
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init: init,
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destroy: destroy,
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start: start,
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stop: stop,
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setFreq: setFreq,
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exportTxt: exportTxt,
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exportCsv: exportCsv,
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copyToClipboard: copyToClipboard,
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clearText: clearDecodedText,
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};
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})();
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