threads: [#60] display error when temperature is unavailable

- -128 as error signal (highly unlikely temp)
- errorView

source/shoh/src/threads/manager/Menu.cpp

@@ -16,7 +16,9 @@ enum
     CURRENT_TEMP,
     DESIRED_TEMP,
     DESIRED_TEMP_F,
-    LOADING
+    LOADING,
+    ERROR,
+    DEVICE_CORRUPTED
 };
 
 static const char * interface_messages [] = 
@@ -24,7 +26,9 @@ static const char * interface_messages [] =
     "CURRENT %3d     ",
     "DESIRED  %2d    ",
     "DESIRED [%2d]   ",
-    "   Loading...   "
+    "   Loading...   ",
+    "    ERROR       ",
+    "Device Corrupted"
 };
 
 Menu::Menu(ThreadCommon::QueueManager* qm): _qm(qm),
@@ -86,7 +90,14 @@ void Menu::parseEvent (Event *ep)
             break;
         case Event::ExternalTemp:
             //Change ExternalTemp value. -99 <= ext_temp <= 99
-            this->ext_temp.setCurrent(ep->getData());
+            EventRawData ext_temp = ep->getData();
+            if(ext_temp == -128)
+            {
+              LOG_ERROR("Menu recieved -128 as ext_temp.");
+              this->SetState(&Menu::sErrorView);
+              break;
+            }
+            this->ext_temp.setCurrent(ext_temp);
             //Refresh the menu screen.
             this->HandleObj(MenuObjEvent (MenuObjEvent::eRefresh));
             break;
@@ -164,6 +175,40 @@ void Menu::sMainView(const MenuObjEvent &e)
     }
 }
 
+void Menu::sErrorView(const MenuObjEvent &e)
+{
+    static char screen_text[64];
+    switch (e.type)
+    {
+    case MenuObjEvent::eFocus: 
+        LOG_DEBUG("enter sErrorView");
+        constructUIString(0, interface_messages[ERROR]);
+        constructUIString(1, interface_messages[DEVICE_CORRUPTED]);
+        this->NotifyAndRefreshUI();
+        break;
+    case MenuObjEvent::eUnFocus:
+        LOG_DEBUG("leave sErrorView");
+        memset(screen_text, 0, 64); // Clear screen
+        this->NotifyAndRefreshUI();
+        break;
+    case MenuObjEvent::eRollClockWise:
+        break;
+    case MenuObjEvent::eRollCClockWise:
+        break;
+    case MenuObjEvent::eClick:
+        break;
+    case MenuObjEvent::eRefresh:
+        LOG_DEBUG("refresh sErrorView");
+        if (this->ext_temp.getCurrent() != -128)
+        {
+          this->SetState(&Menu::sInitView);
+        }
+        break;
+    default:
+        break;
+    }
+}
+
 void Menu::sSetPointMod(const MenuObjEvent &e)
 {
     static char screen_text[64];

source/shoh/src/threads/manager/Menu.h

@@ -35,6 +35,7 @@ private:
   /* States */
   void sInitView(const MenuObjEvent &e);
   void sMainView(const MenuObjEvent &e);
+  void sErrorView(const MenuObjEvent &e);
   void sSetPointMod(const MenuObjEvent &e);
   /* Methods */
   void constructUIString(uint8_t line, const char *fmt, ...);

source/shoh/src/threads/temperature/Temperature.cpp

@@ -16,14 +16,15 @@ Temperature::~Temperature() {}
 void Temperature::taskFunction()
 {
 	SensorTempTC74 ext_temp_sensor(this->_pi2c, 0x4a);
-	Event t (Event::ExternalTemp, -10);
+	Event t (Event::ExternalTemp, -128);
-	int8_t temp_value = -10;
+	int8_t temp_value = -128;
+	_qm->send<Event>(ThreadCommon::QueueManager::master_event_all, &t, 0);
 	for (;;)
 	{
 		if (ext_temp_sensor.is_up())
 			temp_value = ext_temp_sensor.getTemperature();
 
-		if(temp_value == -10) 
+		if(temp_value == -128) 
 		{
 			LOG_ERROR("Failed to get temperature.");
 			continue;