Add MY_DEBUGDEVICE to redirect debug output (#1006)

* Add MY_DEBUGDEVICE to redirect debug output

MY_DEBUGDEVICE, if defined, will replace MY_SERIALDEVICE
for the purpose of printing debug messages. This only
applies to debugging.

hal/architecture/STM32F1/MyHwSTM32F1.cpp

@@ -170,17 +170,20 @@ uint16_t hwFreeMem()
 
 void hwDebugPrint(const char *fmt, ...)
 {
+#ifndef MY_DEBUGDEVICE
+#define MY_DEBUGDEVICE MY_SERIALDEVICE
+#endif
 #ifndef MY_DISABLED_SERIAL
 	char fmtBuffer[MY_SERIAL_OUTPUT_SIZE];
 #ifdef MY_GATEWAY_SERIAL
 	// prepend debug message to be handled correctly by controller (C_INTERNAL, I_LOG_MESSAGE)
 	snprintf_P(fmtBuffer, sizeof(fmtBuffer), PSTR("0;255;%" PRIu8 ";0;%" PRIu8 ";%" PRIu32 " "),
 	           C_INTERNAL, I_LOG_MESSAGE, hwMillis());
-	MY_SERIALDEVICE.print(fmtBuffer);
+	MY_DEBUGDEVICE.print(fmtBuffer);
 #else
 	// prepend timestamp
-	MY_SERIALDEVICE.print(hwMillis());
-	MY_SERIALDEVICE.print(" ");
+	MY_DEBUGDEVICE.print(hwMillis());
+	MY_DEBUGDEVICE.print(" ");
 #endif
 	va_list args;
 	va_start(args, fmt);
@@ -191,10 +194,10 @@ void hwDebugPrint(const char *fmt, ...)
 	fmtBuffer[sizeof(fmtBuffer) - 1] = '\0';
 #endif
 	va_end(args);
-	MY_SERIALDEVICE.print(fmtBuffer);
+	MY_DEBUGDEVICE.print(fmtBuffer);
 	// Disable flush since current STM32duino implementation performs a reset
 	// instead of an actual flush
-	//MY_SERIALDEVICE.flush();
+	//MY_DEBUGDEVICE.flush();
 #else
 	(void)fmt;
 #endif