Merge pull request #21 from cjkas/cjkas/wifi-crash-fix

Fix wifi crash on freq scan

Author: cjkas

.gitignore

@@ -15,4 +15,5 @@ build/
 coredump_report.txt
 coredump.bin
 logs/
-elf_archive/
+elf_archive/
+src/SomfyController.ino.cpp

src/Somfy.cpp

@@ -4878,6 +4878,15 @@ bool Transceiver::begin() {
     return true;
 }
 void Transceiver::loop() {
+  // Dispatch deferred frequency scan requests from the main task so that
+  // attachInterrupt/detachInterrupt cross-core IPCs don't race with WiFi.
+  if(_pendingScan >= 0) {
+    int8_t pending = _pendingScan;
+    _pendingScan = -1;
+    if(pending == 1) this->beginFrequencyScan();
+    else this->endFrequencyScan();
+    return;
+  }
   somfy_rx_t rx;
   if (noiseDetected && rxmode != 3 && this->config.noiseDetection) {
     if (millis() - noiseStart > 100) {

src/Somfy.h

@@ -490,6 +490,10 @@ class Transceiver {
     bool _received = false;
     somfy_frame_t frame;
   public:
+    // -1 = none pending, 1 = beginFrequencyScan pending, 0 = endFrequencyScan pending.
+    // Set from the async_tcp task; consumed by loop() on the main task to avoid
+    // concurrent cross-core IPC races with the WiFi stack (EXCCAUSE_LOAD_PROHIBITED).
+    volatile int8_t _pendingScan = -1;
     transceiver_config_t config;
     bool printBuffer = false;
     //bool toJSON(JsonObject& obj);

src/SomfyController.ino.cpp

@@ -2406,7 +2406,7 @@ void Web::begin() {
     }));
 
   asyncServer.on("/beginFrequencyScan", HTTP_GET, [](AsyncWebServerRequest *request) {
-    somfy.transceiver.beginFrequencyScan();
+    somfy.transceiver._pendingScan = 1; // deferred to main task — see Transceiver::loop()
     AsyncJsonResp resp;
     resp.beginResponse(request, g_async_content, sizeof(g_async_content));
     resp.beginObject();
@@ -2416,7 +2416,7 @@ void Web::begin() {
   });
 
   asyncServer.on("/endFrequencyScan", HTTP_GET, [](AsyncWebServerRequest *request) {
-    somfy.transceiver.endFrequencyScan();
+    somfy.transceiver._pendingScan = 0; // deferred to main task — see Transceiver::loop()
     AsyncJsonResp resp;
     resp.beginResponse(request, g_async_content, sizeof(g_async_content));
     resp.beginObject();