feat: WASM based web simulator (#7164)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

radio/src/gui/gui_common.h

@@ -54,6 +54,7 @@ enum SwitchContext
 int getFirstAvailable(int min, int max, IsValueAvailable isValueAvailable);
 
 bool isChannelUsed(int channel);
+int getChannelsUsed();
 bool checkSourceAvailable(int source, uint32_t sourceTypes);
 bool checkSwitchAvailable(int swtch, uint32_t swtchTypes);
 bool isInputAvailable(int input);

radio/src/storage/sdcard_common.cpp

@@ -27,6 +27,10 @@
 
 #include "hal/abnormal_reboot.h"
 
+#if defined(SIMU)
+extern bool simuCreateDefaultSettings;
+#endif
+
 #if defined(COLORLCD)
   #include "layout.h"
   #include "theme_manager.h"
@@ -211,6 +215,18 @@ void storageReadAll()
   g_eeGeneral.modelCustomScriptsDisabled = true;
   
   if (loadRadioSettings() != nullptr) {
+#if defined(SIMU)
+    if (simuCreateDefaultSettings) {
+      // Web simulator first run: silently create defaults without
+      // STORAGE WARNING alert or calibration screen.
+      simuCreateDefaultSettings = false;
+      storageFormat();
+      g_eeGeneral.chkSum = evalChkSum();
+      storageDirty(EE_GENERAL);
+      storageDirty(EE_MODEL);
+      storageCheck(true);
+    } else
+#endif
     storageEraseAll(true);
   }
 #if !defined(STORAGE_MODELSLIST)

radio/src/targets/simu/simulib.cpp

@@ -33,6 +33,8 @@
 #include "debug.h"
 #include "switches.h"
 #include "input_mapping.h"
+#include "gui/gui_common.h"
+#include "mixes.h"
 #if defined(GVARS)
 #include "gvars.h"
 #endif
@@ -54,6 +56,7 @@ char * main_thread_error = nullptr;
 
 bool simu_shutdown = false;
 bool simu_running = false;
+bool simuCreateDefaultSettings = false;
 
 
 volatile rotenc_t rotencValue = 0;
@@ -115,6 +118,11 @@ static void* bootloaderThread(void*)
 }
 #endif
 
+void simuCreateDefaults()
+{
+  simuCreateDefaultSettings = true;
+}
+
 void simuStart(bool tests)
 {
   if (simu_running)
@@ -759,6 +767,21 @@ uint8_t simuCopyMixOutputs(int16_t* buf, uint8_t maxCount)
   return n;
 }
 
+bool simuIsChannelUsed(uint8_t channel)
+{
+  return isChannelUsed(channel);
+}
+
+int simuGetChannelsUsed()
+{
+  return getChannelsUsed();
+}
+
+uint8_t simuGetMixCount()
+{
+  return getMixCount();
+}
+
 uint8_t simuGetNumLogicalSwitches()
 {
   return MAX_LOGICAL_SWITCHES;

radio/src/targets/simu/simulib.h

@@ -123,6 +123,11 @@ uint8_t  WASM_EXPORT(simuGetNumChannels)();
 uint8_t  WASM_EXPORT(simuCopyChannelOutputs)(int16_t* buf, uint8_t maxCount);
 uint8_t  WASM_EXPORT(simuCopyMixOutputs)(int16_t* buf, uint8_t maxCount);
 
+// Channel/mixer queries.
+bool     WASM_EXPORT(simuIsChannelUsed)(uint8_t channel);
+int      WASM_EXPORT(simuGetChannelsUsed)();
+uint8_t  WASM_EXPORT(simuGetMixCount)();
+
 // Bulk copy logical switch states into buf (uint8_t[], 0 or 1). Returns count.
 uint8_t  WASM_EXPORT(simuGetNumLogicalSwitches)();
 uint8_t  WASM_EXPORT(simuCopyLogicalSwitches)(uint8_t* buf, uint8_t maxCount);
@@ -162,6 +167,14 @@ void WASM_IMPORT(simuTrace)(const char* text);
 // listener so the frame can be rendered without polling.
 void WASM_IMPORT(simuLcdNotify)();
 
+// First-run helper: request default radio.yml + model creation if
+// no settings file exists.  Call before simuStart().  The actual file
+// I/O runs inside storageReadAll() on a worker thread.
+void WASM_EXPORT(simuCreateDefaults)();
+
+// Flag checked by storageReadAll() to silently create defaults.
+extern bool simuCreateDefaultSettings;
+
 // Aux serial bridge (firmware -> host).  port_nr is 0 for AUX1, 1 for AUX2.
 // encoding values match SimulatorSerialEncoding (0=8N1, 1=8E2, 2=PXX1_PWM)
 // and ETX_Encoding_* — they share the same numeric values.  Called when the