Fix for cfg exceeding LED limit

wled00/FX_fcn.cpp

@@ -1180,14 +1180,17 @@ void WS2812FX::finalizeInit() {
 
   // create buses/outputs
   unsigned mem = 0;
-  for (const auto &bus : busConfigs) {
-    mem += bus.memUsage(Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) ? digitalCount++ : 0); // includes global buffer
-    if (mem <= MAX_LED_MEMORY) {
-      if (BusManager::add(bus) == -1) break;
-    } else {
-      errorFlag = ERR_NORAM_PX; // alert UI
-      DEBUG_PRINTF_P(PSTR("Out of LED memory! Bus %d (%d) #%u not created."), (int)bus.type, (int)bus.count, digitalCount);
+  for (auto bus : busConfigs) {
+    unsigned busMemUsage = bus.memUsage(Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) ? digitalCount : 0);
+    // if memory exceeds limit, add it anyway but reduce LED count to default if it is larger (a bit dangerous, but prevents no buses being created at all)
+    if (mem + busMemUsage > MAX_LED_MEMORY) {
+      bus.count = min((int)bus.count, DEFAULT_LED_COUNT);
+      DEBUG_PRINTF_P(PSTR("Bus %d memory usage exceeds limit, setting count to %d\n"), (int)bus.type, bus.count);
     }
+    if (BusManager::add(bus) != -1) {
+      mem += bus.memUsage(Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) ? digitalCount : 0);
+      if (Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type)) digitalCount++;
+    } else break;
   }
   busConfigs.clear();
   busConfigs.shrink_to_fit();

wled00/data/index.js

@@ -668,9 +668,20 @@ function parseInfo(i) {
 	if (loc)    name = "(L) " + name;
 	d.title      = name;
 	simplifiedUI = i.simplifiedui;
-	ledCount     = i.leds.count;
+	// safety checks for LED count data to prevent UI crashes
+	if (i.leds && typeof i.leds.count !== 'undefined') {
+		ledCount = i.leds.count;
+	} else {
+		console.warn('No LED count');
+		ledCount = 30; // fallback value
+	}
 	//syncTglRecv   = i.str;
-	maxSeg       = i.leds.maxseg;
+	if (i.leds && typeof i.leds.maxseg !== 'undefined') {
+		maxSeg = i.leds.maxseg;
+	} else {
+		console.warn('No max segment data');
+		maxSeg = 16; // Reasonable fallback for max segments
+	}
 	pmt          = i.fs.pmt;
 	if (pcMode && !i.wifi.ap) gId('edit').classList.remove("hide"); else gId('edit').classList.add("hide");
 	gId('buttonNodes').style.display = lastinfo.ndc > 0 ? null:"none";
@@ -912,12 +923,24 @@ function populateSegments(s)
 		gId(`segr${i}`).classList.add("hide");
 	}
 	if (segCount < 2) {
-		gId(`segd${lSeg}`).classList.add("hide"); // hide delete if only one segment
-		if (parseInt(gId("seg0bri").value)==255) gId(`segp0`).classList.add("hide");
+		// safety check for segment elements to prevent UI crashes
+		const segdElement = gId(`segd${lSeg}`);
+		if (segdElement) segdElement.classList.add("hide"); // hide delete if only one segment
+		const seg0briElement = gId("seg0bri");
+		const segp0Element = gId(`segp0`);
+		if (seg0briElement && segp0Element && parseInt(seg0briElement.value)==255) segp0Element.classList.add("hide");
 		// hide segment controls if there is only one segment in simplified UI
 		if (simplifiedUI) gId("segcont").classList.add("hide");
 	}
-	if (!isM && !noNewSegs && (cfg.comp.seglen?parseInt(gId(`seg${lSeg}s`).value):0)+parseInt(gId(`seg${lSeg}e`).value)<ledCount) gId(`segr${lSeg}`).classList.remove("hide");
+	// safety checks for segment control elements
+	const segSElement = gId(`seg${lSeg}s`);
+	const segEElement = gId(`seg${lSeg}e`);
+	const segrElement = gId(`segr${lSeg}`);
+	if (!isM && !noNewSegs && segSElement && segEElement && segrElement) {
+		const segLen = cfg.comp.seglen ? parseInt(segSElement.value) : 0;
+		const segEnd = parseInt(segEElement.value);
+		if (segLen + segEnd < ledCount) segrElement.classList.remove("hide");
+	}
 	gId('segutil2').style.display = (segCount > 1) ? "block":"none"; // rsbtn parent
 
 	if (Array.isArray(li.maps) && li.maps.length>1) {
@@ -2253,7 +2276,9 @@ function rptSeg(s)
 	var rev = gId(`seg${s}rev`).checked;
 	var mi = gId(`seg${s}mi`).checked;
 	var sel = gId(`seg${s}sel`).checked;
-	var pwr = gId(`seg${s}pwr`).classList.contains('act');
+	// safety check for segment power element to prevent UI crashes
+	const segPwrElement = gId(`seg${s}pwr`);
+	var pwr = segPwrElement ? segPwrElement.classList.contains('act') : false;
 	var obj = {"seg": {"id": s, "n": name, "start": start, "stop": (cfg.comp.seglen?start:0)+stop, "rev": rev, "mi": mi, "on": pwr, "bri": parseInt(gId(`seg${s}bri`).value), "sel": sel}};
 	if (gId(`seg${s}grp`)) {
 		var grp = parseInt(gId(`seg${s}grp`).value);
@@ -2380,7 +2405,13 @@ function setGrp(s, g)
 
 function setSegPwr(s)
 {
-	var pwr = gId(`seg${s}pwr`).classList.contains('act');
+	// safety check for segment power element to prevent UI crashes
+	const segPwrElement = gId(`seg${s}pwr`);
+	if (!segPwrElement) {
+		console.warn('No power elemen');
+		return;
+	}
+	var pwr = segPwrElement.classList.contains('act');
 	var obj = {"seg": {"id": s, "on": !pwr}};
 	requestJson(obj);
 }