RPi: Add support for I2C

Add MyHw file for RaspberryPi.

Fix compilation warnings in x86.

Fix some error messages.

core/MyHwRPi.cpp

@@ -0,0 +1,151 @@
+/**
+ * The MySensors Arduino library handles the wireless radio link and protocol
+ * between your home built sensors/actuators and HA controller of choice.
+ * The sensors forms a self healing radio network with optional repeaters. Each
+ * repeater and gateway builds a routing tables in EEPROM which keeps track of the
+ * network topology allowing messages to be routed to nodes.
+ *
+ * Created by Marcelo Aquino <marceloaqno@gmail.org>
+ * Copyright (C) 2016 Marcelo Aquino
+ * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
+ *
+ * Documentation: http://www.mysensors.org
+ * Support Forum: http://forum.mysensors.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include "MyHwRPi.h"
+
+#include <stdarg.h>
+#include <time.h>
+#include "SoftEeprom.h"
+#include "log.h"
+
+static SoftEeprom eeprom = SoftEeprom(MY_LINUX_CONFIG_FILE, 1024);	// ATMega328 has 1024 bytes
+
+void hwInit()
+{
+	if (!bcm2835_init()) {
+		mys_log(LOG_ERR, "Failed to initialized bcm2835.\n");
+		exit(1);
+	}
+
+#ifdef MY_GATEWAY_SERIAL
+	MY_SERIALDEVICE.begin(MY_BAUD_RATE);
+	#ifdef MY_LINUX_SERIAL_GROUPNAME
+		if (!MY_SERIALDEVICE.setGroupPerm(MY_LINUX_SERIAL_GROUPNAME)) {
+			mys_log(LOG_ERR, "Unable to change permission for serial port device.\n");
+			exit(1);
+		}
+	#endif
+#endif
+}
+
+void hwReadConfigBlock(void* buf, void* adr, size_t length)
+{
+	eeprom.readBlock(buf, adr, length);
+}
+
+void hwWriteConfigBlock(void* buf, void* adr, size_t length)
+{
+	eeprom.writeBlock(buf, adr, length);
+}
+
+uint8_t hwReadConfig(int adr)
+{
+	return eeprom.readByte(adr);
+}
+
+void hwWriteConfig(int adr, uint8_t value)
+{
+	eeprom.writeByte(adr, value);
+}
+
+void hwRandomNumberInit()
+{
+	randomSeed(time(NULL));
+}
+
+unsigned long hwMillis()
+{
+	return millis();
+}
+
+// Not supported!
+int8_t hwSleep(unsigned long ms)
+{
+	(void)ms;
+
+	return MY_SLEEP_NOT_POSSIBLE;
+}
+
+// Not supported!
+int8_t hwSleep(uint8_t interrupt, uint8_t mode, unsigned long ms)
+{
+	(void)interrupt;
+	(void)mode;
+	(void)ms;
+
+	return MY_SLEEP_NOT_POSSIBLE;
+}
+
+// Not supported!
+int8_t hwSleep(uint8_t interrupt1, uint8_t mode1, uint8_t interrupt2, uint8_t mode2, unsigned long ms)
+{
+	(void)interrupt1;
+	(void)mode1;
+	(void)interrupt2;
+	(void)mode2;
+	(void)ms;
+	
+	return MY_SLEEP_NOT_POSSIBLE;
+}
+
+#if defined(MY_DEBUG) || defined(MY_SPECIAL_DEBUG)
+	uint16_t hwCPUVoltage()
+	{
+		// TODO: Not supported!
+		return 0;
+	}
+	 
+	uint16_t hwCPUFrequency()
+	{
+		// TODO: Not supported!
+		return 0;
+	}
+	 
+	uint16_t hwFreeMem()
+	{
+		// TODO: Not supported!
+		return 0;
+	}
+#endif
+
+#ifdef MY_DEBUG
+	void hwDebugPrint(const char *fmt, ...)
+	{
+		va_list args;
+
+		va_start(args, fmt);
+		mys_log_v(LOG_DEBUG, fmt, args);
+		va_end(args);
+	}
+#endif
+
+void hwDigitalWrite(uint8_t pin, uint8_t value)
+{
+	digitalWrite(pin, value);
+}
+
+int hwDigitalRead(uint8_t pin)
+{
+	return digitalRead(pin);
+}
+
+void hwPinMode(uint8_t pin, uint8_t mode)
+{
+	pinMode(pin, mode);
+}