hellen: please no calls to OS code on possible hardFault paths

only:uaefi

firmware/config/boards/hellen/hellen_common.cpp

@@ -83,6 +83,12 @@ void hellenEnableEn(const char *msg) {
 
 void hellenDisableEn(const char *msg) {
   efiPrintf("Turning board off [%s]", msg);
+  hellenDisableEnSilently();
+}
+
+void hellenDisableEnSilently() {
+	// this function is called from criticalShutdown() that may be called from hardFault handler
+	// please no call to OS functions!
 	setHellenEnValue(0);
 }
 

firmware/config/boards/hellen_meta.h

@@ -20,6 +20,7 @@ bool isBoardWithPowerManagement();
 bool getHellenBoardEnabled();
 void hellenEnableEn(const char *msg = "");
 void hellenDisableEn(const char *msg = "");
+void hellenDisableEnSilently(); // this version is called by fatal error handler meaning no OS access
 
 void hellenBoardStandBy();
 void hellenMegaSdWithAccelerometer();

firmware/controllers/system/efi_gpio.cpp

@@ -847,7 +847,7 @@ void turnAllPinsOff() {
 	enginePins.fuelPumpRelay.setValue(false);
 	enginePins.checkEnginePin.setValue(true); // yes this one can go ON
 #if EFI_PROD_CODE && HW_HELLEN
-  hellenDisableEn("fatal");
+  hellenDisableEnSilently();
 #endif
 }
 #endif /* EFI_GPIO_HARDWARE */