Code cleanup (#787)

* Cleanup Core

* SAMD adjustments

core/MyHwSAMD.h

@@ -6,7 +6,7 @@
  * network topology allowing messages to be routed to nodes.
  *
  * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
- * Copyright (C) 2013-2015 Sensnology AB
+ * Copyright (C) 2013-2017 Sensnology AB
  * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
  *
  * Documentation: http://www.mysensors.org
@@ -28,10 +28,10 @@
 #include <avr/dtostrf.h>
 
 // defines for sensebender gw variant.h
-#define MY_EXT_EEPROM_I2C_ADDRESS	(0x50)
+#define MY_EXT_EEPROM_I2C_ADDRESS	(0x50u)
 #define MY_EXT_EEPROM_SIZE			(kbits_512)
 #define MY_EXT_EEPROM_PAGE_SIZE		(32u)
-#define MY_EXT_EEPROM_TWI_CLOCK		(twiClock400kHz)
+#define MY_EXT_EEPROM_TWI_CLOCK		(twiClock100kHz)	// can be set to 400kHz with precaution if other i2c devices on bus
 
 extEEPROM eep(MY_EXT_EEPROM_SIZE, 1, MY_EXT_EEPROM_PAGE_SIZE,
               MY_EXT_EEPROM_I2C_ADDRESS);	//device size, number of devices, page size
@@ -48,9 +48,9 @@ extEEPROM eep(MY_EXT_EEPROM_SIZE, 1, MY_EXT_EEPROM_PAGE_SIZE,
 #define hwMillis() millis()
 #define hwRandomNumberInit() randomSeed(analogRead(MY_SIGNING_SOFT_RANDOMSEED_PIN))
 
-void hwInit();
-void hwWatchdogReset();
-void hwReboot();
+bool hwInit(void);
+void hwWatchdogReset(void);
+void hwReboot(void);
 void hwReadConfigBlock(void* buf, void* adr, size_t length);
 void hwWriteConfigBlock(void* buf, void* adr, size_t length);
 void hwWriteConfig(int adr, uint8_t value);