Various fixes for SAMD (#510)

* Only serial GW should hold back on USB

* Fixing some examples on archs other than avr

* HwInit() is needed on samd, to init I2C

examples/DimmableLight/DimmableLight.ino

@@ -20,13 +20,13 @@
  *
  * REVISION HISTORY
  * Version 1.0 - January 30, 2015 - Developed by GizMoCuz (Domoticz)
- * 
+ *
  * DESCRIPTION
- * This sketch provides an example how to implement a Dimmable Light 
+ * This sketch provides an example how to implement a Dimmable Light
  * It is pure virtual and it logs messages to the serial output
  * It can be used as a base sketch for actual hardware.
  * Stores the last light state and level in eeprom.
- * 
+ *
  */
 
 // Enable debug prints
@@ -37,7 +37,7 @@
 //#define MY_RADIO_RFM69
 
 #include <SPI.h>
-#include <MySensors.h>  
+#include <MySensors.h>
 
 #define CHILD_ID_LIGHT 1
 
@@ -50,19 +50,19 @@
 #define SN "Dimable Light"
 #define SV "1.0"
 
-int LastLightState=LIGHT_OFF;
-int LastDimValue=100;
+int16_t LastLightState=LIGHT_OFF;
+int16_t LastDimValue=100;
 
 MyMessage lightMsg(CHILD_ID_LIGHT, V_LIGHT);
 MyMessage dimmerMsg(CHILD_ID_LIGHT, V_DIMMER);
 
-void setup()  
-{ 
+void setup()
+{
   //Retreive our last light state from the eprom
-  int LightState=loadState(EPROM_LIGHT_STATE); 
+  int LightState=loadState(EPROM_LIGHT_STATE);
   if (LightState<=1) {
     LastLightState=LightState;
-    int DimValue=loadState(EPROM_DIMMER_LEVEL); 
+    int DimValue=loadState(EPROM_DIMMER_LEVEL);
     if ((DimValue>0)&&(DimValue<=100)) {
       //There should be no Dim value of 0, this would mean LIGHT_OFF
       LastDimValue=DimValue;
@@ -71,8 +71,8 @@ void setup()
 
   //Here you actualy switch on/off the light with the last known dim level
   SetCurrentState2Hardware();
-  
-  Serial.println( "Node ready to receive messages..." );  
+
+  Serial.println( "Node ready to receive messages..." );
 }
 
 void presentation() {
@@ -82,7 +82,7 @@ void presentation() {
   present(CHILD_ID_LIGHT, S_DIMMER );
 }
 
-void loop()      
+void loop()
 {
 }
 
@@ -90,7 +90,7 @@ void receive(const MyMessage &message)
 {
   if (message.type == V_LIGHT) {
     Serial.println( "V_LIGHT command received..." );
-    
+
     int lstate= atoi( message.data );
     if ((lstate<0)||(lstate>1)) {
       Serial.println( "V_LIGHT data invalid (should be 0/1)" );
@@ -98,7 +98,7 @@ void receive(const MyMessage &message)
     }
     LastLightState=lstate;
     saveState(EPROM_LIGHT_STATE, LastLightState);
-    
+
     if ((LastLightState==LIGHT_ON)&&(LastDimValue==0)) {
        //In the case that the Light State = On, but the dimmer value is zero,
        //then something (probably the controller) did something wrong,
@@ -106,13 +106,13 @@ void receive(const MyMessage &message)
       LastDimValue=100;
       saveState(EPROM_DIMMER_LEVEL, LastDimValue);
     }
-    
+
     //When receiving a V_LIGHT command we switch the light between OFF and the last received dimmer value
     //This means if you previously set the lights dimmer value to 50%, and turn the light ON
     //it will do so at 50%
   }
   else if (message.type == V_DIMMER) {
-    Serial.println( "V_DIMMER command received..." );  
+    Serial.println( "V_DIMMER command received..." );
     int dimvalue= atoi( message.data );
     if ((dimvalue<0)||(dimvalue>100)) {
       Serial.println( "V_DIMMER data invalid (should be 0..100)" );
@@ -128,7 +128,7 @@ void receive(const MyMessage &message)
     }
   }
   else {
-    Serial.println( "Invalid command received..." );  
+    Serial.println( "Invalid command received..." );
     return;
   }
 
@@ -153,10 +153,9 @@ void SetCurrentState2Hardware()
 void SendCurrentState2Controller()
 {
   if ((LastLightState==LIGHT_OFF)||(LastDimValue==0)) {
-    send(dimmerMsg.set(0));
+    send(dimmerMsg.set((int16_t)0));
   }
   else {
     send(dimmerMsg.set(LastDimValue));
   }
 }
-