Factor out board config detection

Config.h

@@ -1,20 +1,13 @@
 #include "ROM.h"
 
+#include "Platform.h"
+
 #ifndef CONFIG_H
 	#define CONFIG_H
 
 	#define MAJ_VERS  0x01
 	#define MIN_VERS  0x1B
 
-	#define PLATFORM_AVR   0x90
-    #define PLATFORM_ESP32 0x80
-    #define PLATFORM_LINUX 0x70
-
-	#define MCU_1284P 0x91
-	#define MCU_2560  0x92
-	#define MCU_ESP32 0x81
-    #define MCU_LINUX 0x71
-
 	#define BOARD_RNODE         0x31
 	#define BOARD_HMBRW         0x32
 	#define BOARD_TBEAM         0x33
@@ -24,24 +17,25 @@
 	#define BOARD_LORA32_V2_1   0x37
     #define BOARD_SPIDEV        0x38
     
-    #define LIBRARY_ARDUINO     0x1
-    #define LIBRARY_C           0x2
-
 	#define MODE_HOST 0x11
 	#define MODE_TNC  0x12
 
 	#if defined(__AVR_ATmega1284P__)
 	    #define PLATFORM PLATFORM_AVR
 	    #define MCU_VARIANT MCU_1284P
+        #define LIBRARY_TYPE LIBRARY_ARDUINO
 	#elif defined(__AVR_ATmega2560__)
 	    #define PLATFORM PLATFORM_AVR
 	    #define MCU_VARIANT MCU_2560
+        #define LIBRARY_TYPE LIBRARY_ARDUINO
 	#elif defined(ESP32)
 	    #define PLATFORM PLATFORM_ESP32
 	    #define MCU_VARIANT MCU_ESP32
+        #define LIBRARY_TYPE LIBRARY_ARDUINO
     #elif defined(__unix__)
         #define PLATFORM PLATFORM_LINUX
         #define MCU_VARIANT MCU_LINUX
+        #define LIBRARY_TYPE LIBRARY_C
 	#else
 	    #error "The firmware cannot be compiled for the selected MCU variant"
 	#endif
@@ -63,7 +57,6 @@
 		const int pin_led_tx = 13;
 
 		#define BOARD_MODEL BOARD_RNODE
-        #define LIBRARY_TYPE LIBRARY_ARDUINO
 
 		#define CONFIG_UART_BUFFER_SIZE 6144
 		#define CONFIG_QUEUE_SIZE 6144
@@ -80,7 +73,6 @@
 		const int pin_led_tx = 13;
 
 		#define BOARD_MODEL BOARD_HMBRW
-        #define LIBRARY_TYPE LIBRARY_ARDUINO
 
 		#define CONFIG_UART_BUFFER_SIZE 768
 		#define CONFIG_QUEUE_SIZE 5120
@@ -142,8 +134,6 @@
 			#error An unsupported board was selected. Cannot compile RNode firmware.
 		#endif
         
-        #define LIBRARY_TYPE LIBRARY_ARDUINO
-
 		#define CONFIG_UART_BUFFER_SIZE 6144
 		#define CONFIG_QUEUE_SIZE 6144
 		#define CONFIG_QUEUE_MAX_LENGTH 200
@@ -162,7 +152,6 @@
 		const int pin_led_tx = -1;
 
 		#define BOARD_MODEL BOARD_SPIDEV
-        #define LIBRARY_TYPE LIBRARY_C
 
 		#define CONFIG_UART_BUFFER_SIZE 6144
 		#define CONFIG_QUEUE_SIZE 6144

LoRa.cpp

@@ -6,24 +6,6 @@
 
 #include "LoRa.h"
 
-#define MCU_1284P 0x91
-#define MCU_2560  0x92
-#define MCU_ESP32 0x81
-#if defined(__AVR_ATmega1284P__)
-  #define PLATFORM PLATFORM_AVR
-  #define MCU_VARIANT MCU_1284P
-#elif defined(__AVR_ATmega2560__)
-  #define PLATFORM PLATFORM_AVR
-  #define MCU_VARIANT MCU_2560
-#elif defined(ESP32)
-  #define PLATFORM PLATFORM_ESP32
-  #define MCU_VARIANT MCU_ESP32
-#endif
-
-#ifndef MCU_VARIANT
-  #error No MCU variant defined, cannot compile
-#endif
-
 #if MCU_VARIANT == MCU_ESP32
   #include "soc/rtc_wdt.h"
   #define ISR_VECT IRAM_ATTR

LoRa.h

@@ -7,8 +7,16 @@
 #ifndef LORA_H
 #define LORA_H
 
+#include "Platform.h"
+
+#if LIBRARY_TYPE == LIBRARY_ARDUINO
     #include <Arduino.h>
     #include <SPI.h>
+#elif LIBRARY_TYPE == LIBRARY_C
+    #include <cstdlib>
+    #include <cstdint>
+    #include "ArduinoOnLinux/Stream.h"
+#endif
 
 #define LORA_DEFAULT_SS_PIN    10
 #define LORA_DEFAULT_RESET_PIN 9

MD5.cpp

@@ -1,7 +1,7 @@
 #include "MD5.h"
 
 #if LIBRARY_TYPE == LIBRARY_ARDUINO
-    #include "Arduino.h"
+    #include <Arduino.h>
 #elif LIBRARY_TYPE == LIBRARY_C
     #include <cstdlib>
 #endif

Makefile

@@ -145,6 +145,9 @@ clean:
 	rm -Rf bin
 	rm -Rf obj
 	
-obj/MD5.o: MD5.cpp MD5.h Config.h ROM.h prep-linux
+obj/MD5.o: MD5.cpp MD5.h Config.h ROM.h Platform.h prep-linux
+	$(CC) -c -o $@ $<
+	
+obj/LoRa.o: LoRa.cpp LoRa.h Platform.h prep-linux
 	$(CC) -c -o $@ $<
 	

Platform.h

@@ -0,0 +1,42 @@
+#ifndef PLATFORM_H
+#define PLATFORM_H
+
+// Determine the platform, MCU, and C library we are building for.
+
+#define PLATFORM_AVR   0x90
+#define PLATFORM_ESP32 0x80
+#define PLATFORM_LINUX 0x70
+
+#define MCU_1284P 0x91
+#define MCU_2560  0x92
+#define MCU_ESP32 0x81
+#define MCU_LINUX 0x71
+
+#define LIBRARY_ARDUINO     0x1
+#define LIBRARY_C           0x2
+
+#if defined(__AVR_ATmega1284P__)
+    #define PLATFORM PLATFORM_AVR
+    #define MCU_VARIANT MCU_1284P
+    #define LIBRARY_TYPE LIBRARY_ARDUINO
+#elif defined(__AVR_ATmega2560__)
+    #define PLATFORM PLATFORM_AVR
+    #define MCU_VARIANT MCU_2560
+    #define LIBRARY_TYPE LIBRARY_ARDUINO
+#elif defined(ESP32)
+    #define PLATFORM PLATFORM_ESP32
+    #define MCU_VARIANT MCU_ESP32
+    #define LIBRARY_TYPE LIBRARY_ARDUINO
+#elif defined(__unix__)
+    #define PLATFORM PLATFORM_LINUX
+    #define MCU_VARIANT MCU_LINUX
+    #define LIBRARY_TYPE LIBRARY_C
+#else
+    #error "The firmware cannot be compiled for the selected MCU variant"
+#endif
+
+#ifndef MCU_VARIANT
+  #error No MCU variant defined, cannot compile
+#endif
+
+#endif