Added custom platform option

src/BuildOpt.h

@@ -14,6 +14,7 @@
  * RADIOLIB_PIN_TYPE - which type should be used for pin numbers in functions like digitalRead().
  * RADIOLIB_PIN_MODE - which type should be used for pin modes in functions like pinMode().
  * RADIOLIB_PIN_STATUS - which type should be used for pin values in functions like digitalWrite().
+ * RADIOLIB_DIGITAL_PIN_TO_INTERRUPT - function to be used to convert digital pin number to interrupt pin number.
  * RADIOLIB_INTERRUPT_STATUS - which type should be used for pin changes in functions like attachInterrupt().
  * RADIOLIB_NC - alias for unused pin, usually the largest possible value of RADIOLIB_PIN_TYPE.
  * RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED - defined if the specific platform does not support SoftwareSerial.
@@ -21,8 +22,12 @@
  * RADIOLIB_TONE_UNSUPPORTED - some platforms do not have tone()/noTone(), which is required for AFSK.
  *
  * In addition, some platforms may require RadioLib to disable specific drivers (such as ESP8266).
+ *
+ * Users may also specify their own configuration by defining all of the platform-specific parameters
+ * and macro RADIOLIB_CUSTOM_PLATFORM prior to including the main library file (RadioLib.h).
  */
-#if defined(__AVR__) && !(defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_AVR_NANO_EVERY))
+#if !defined(RADIOLIB_CUSTOM_PLATFORM)
+  #if defined(__AVR__) && !(defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_AVR_NANO_EVERY))
     // Arduino AVR boards (except for megaAVR) - Uno, Mega etc.
     #define RADIOLIB_PLATFORM                           "Arduino AVR"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -32,7 +37,7 @@
     #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        digitalPinToInterrupt(p)
     #define RADIOLIB_NC                                 (0xFF)
 
-#elif defined(ESP8266)
+  #elif defined(ESP8266)
     // ESP8266 boards
     #define RADIOLIB_PLATFORM                           "ESP8266"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -45,7 +50,7 @@
     // RadioLib has ESP8266 driver, this must be disabled to use ESP8266 as platform
     #define _RADIOLIB_ESP8266_H
 
-#elif defined(ESP32)
+  #elif defined(ESP32)
     // ESP32 boards
     #define RADIOLIB_PLATFORM                           "ESP32"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -58,7 +63,7 @@
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
     #define RADIOLIB_TONE_UNSUPPORTED
 
-#elif defined(ARDUINO_ARCH_STM32)
+  #elif defined(ARDUINO_ARCH_STM32)
     // official STM32 Arduino core (https://github.com/stm32duino/Arduino_Core_STM32)
     #define RADIOLIB_PLATFORM                           "Arduino STM32 (official)"
     #define RADIOLIB_PIN_TYPE                           uint32_t
@@ -70,7 +75,7 @@
     #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
 
-#elif defined(SAMD_SERIES)
+  #elif defined(SAMD_SERIES)
     // Arduino SAMD boards - Zero, MKR, etc.
     #define RADIOLIB_PLATFORM                           "Arduino SAMD"
     #define RADIOLIB_PIN_TYPE                           uint32_t
@@ -82,7 +87,7 @@
     #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
 
-#elif defined(__SAM3X8E__)
+  #elif defined(__SAM3X8E__)
     // Arduino Due
     #define RADIOLIB_PLATFORM                           "Arduino Due"
     #define RADIOLIB_PIN_TYPE                           uint32_t
@@ -95,7 +100,7 @@
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
     #define RADIOLIB_TONE_UNSUPPORTED
 
-#elif (defined(NRF52832_XXAA) || defined(NRF52840_XXAA)) && !defined(ARDUINO_ARDUINO_NANO33BLE)
+  #elif (defined(NRF52832_XXAA) || defined(NRF52840_XXAA)) && !defined(ARDUINO_ARDUINO_NANO33BLE)
     // Adafruit nRF52 boards
     #define RADIOLIB_PLATFORM                           "Adafruit nRF52"
     #define RADIOLIB_PIN_TYPE                           uint32_t
@@ -105,7 +110,7 @@
     #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        digitalPinToInterrupt(p)
     #define RADIOLIB_NC                                 (0xFFFFFFFF)
 
-#elif defined(ARDUINO_ARC32_TOOLS)
+  #elif defined(ARDUINO_ARC32_TOOLS)
     // Intel Curie
     #define RADIOLIB_PLATFORM                           "Intel Curie"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -115,7 +120,7 @@
     #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        digitalPinToInterrupt(p)
     #define RADIOLIB_NC                                 (0xFF)
 
-#elif defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_AVR_NANO_EVERY)
+  #elif defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined(ARDUINO_AVR_NANO_EVERY)
     // Arduino megaAVR boards - Uno Wifi Rev.2, Nano Every
     #define RADIOLIB_PLATFORM                           "Arduino megaAVR"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -125,7 +130,7 @@
     #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        digitalPinToInterrupt(p)
     #define RADIOLIB_NC                                 (0xFF)
 
-#elif defined(AM_PART_APOLLO3)
+  #elif defined(AM_PART_APOLLO3)
     // Sparkfun Artemis boards
     #define RADIOLIB_PLATFORM                           "Sparkfun Artemis"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -138,7 +143,7 @@
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
     #define RADIOLIB_TONE_UNSUPPORTED
 
-#elif defined(ARDUINO_ARDUINO_NANO33BLE)
+  #elif defined(ARDUINO_ARDUINO_NANO33BLE)
     // Arduino Nano 33 BLE
     #define RADIOLIB_PLATFORM                           "Arduino Nano 33 BLE"
     #define RADIOLIB_PIN_TYPE                           pin_size_t
@@ -153,7 +158,7 @@
     // Nano 33 BLE uses mbed libraries, which already contain ESP8266 driver
     #define _RADIOLIB_ESP8266_H
 
-#elif defined(__STM32F4__) || defined(__STM32F1__)
+  #elif defined(__STM32F4__) || defined(__STM32F1__)
     // Arduino STM32 core by Roger Clark (https://github.com/rogerclarkmelbourne/Arduino_STM32)
     #define RADIOLIB_PLATFORM                           "STM32duino (unofficial)"
     #define RADIOLIB_PIN_TYPE                           uint8_t
@@ -166,7 +171,7 @@
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
     #define RADIOLIB_TONE_UNSUPPORTED
 
-#else
+  #else
     // other platforms not covered by the above list - this may or may not work
     #define RADIOLIB_PLATFORM                           "Unknown"
     #define RADIOLIB_UNKNOWN_PLATFORM
@@ -177,6 +182,7 @@
     #define RADIOLIB_DIGITAL_PIN_TO_INTERRUPT(p)        digitalPinToInterrupt(p)
     #define RADIOLIB_NC                                 (0xFF)
 
+  #endif
 #endif
 
 /*