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Fix Morse decoder scope events not reaching frontend

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Replace blocking rtl_stdout.read() with select()+os.read() so the
decoder thread emits diagnostic heartbeat scope events when rtl_fm
produces no PCM data (common in direct sampling mode). Add waiting-state
rendering in the scope canvas and hide the generic placeholder/status
bar for morse mode.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-26 09:30:58 +00:00
parent 2eea28da05
commit c0c066904c
4 changed files with 79 additions and 3 deletions
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14
static/js/modes/morse.js
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@@ -22,6 +22,7 @@ var MorseMode = (function () {
var SCOPE_HISTORY_LEN = 300;
var scopeThreshold = 0;
var scopeToneOn = false;
var scopeWaiting = false;
// ---- Initialization ----
@@ -150,6 +151,11 @@ var MorseMode = (function () {
if (type === 'scope') {
// Update scope data
var amps = msg.amplitudes || [];
if (msg.waiting && amps.length === 0 && scopeHistory.length === 0) {
scopeWaiting = true;
} else if (amps.length > 0) {
scopeWaiting = false;
}
for (var i = 0; i < amps.length; i++) {
scopeHistory.push(amps[i]);
if (scopeHistory.length > SCOPE_HISTORY_LEN) {
@@ -238,6 +244,7 @@ var MorseMode = (function () {
scopeCtx = canvas.getContext('2d');
scopeCtx.scale(dpr, dpr);
scopeHistory = [];
scopeWaiting = false;
var toneLabel = document.getElementById('morseScopeToneLabel');
var threshLabel = document.getElementById('morseScopeThreshLabel');
@@ -255,6 +262,13 @@ var MorseMode = (function () {
if (threshLabel) threshLabel.textContent = scopeThreshold > 0 ? Math.round(scopeThreshold) : '--';
if (scopeHistory.length === 0) {
if (scopeWaiting) {
scopeCtx.fillStyle = '#556677';
scopeCtx.font = '12px monospace';
scopeCtx.textAlign = 'center';
scopeCtx.fillText('Awaiting SDR data\u2026', w / 2, h / 2);
scopeCtx.textAlign = 'start';
}
scopeAnim = requestAnimationFrame(draw);
return;
}