Linux: Add support for SPIDEV (#734)

RPi and Linux refactor.

Add GPIO Sysfs for GPIO operations.

Update configure script.

Fix some cppcheck warnings.

Add serial emulation that prints to stdout.

Fix some file headers.

core/MyHwLinuxGeneric.cpp

@@ -28,8 +28,8 @@ static SoftEeprom eeprom = SoftEeprom(MY_LINUX_CONFIG_FILE, 1024);	// ATMega328
 
 void hwInit()
 {
-#ifdef MY_GATEWAY_SERIAL
 	MY_SERIALDEVICE.begin(MY_BAUD_RATE);
+#ifdef MY_GATEWAY_SERIAL
 #ifdef MY_LINUX_SERIAL_GROUPNAME
 	if (!MY_SERIALDEVICE.setGroupPerm(MY_LINUX_SERIAL_GROUPNAME)) {
 		logError("Unable to change permission for serial port device.\n");
@@ -120,6 +120,21 @@ uint16_t hwFreeMem()
 }
 #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);
+}
+
 #ifdef MY_DEBUG
 void hwDebugPrint(const char *fmt, ...)
 {