Added support for Adafruit SAMD boards

.travis.yml

@@ -18,6 +18,7 @@ env:
     - BOARD="SparkFun:apollo3:amap3redboard"
     - BOARD="arduino:mbed:nano33ble"
     - BOARD="stm32duino:STM32F1:mapleMini:bootloader_version=original,cpu_speed=speed_72mhz"
+    - BOARD="adafruit:samd:adafruit_feather_m0:usbstack=arduino,debug=off"
 
 addons:
   apt:
@@ -105,6 +106,11 @@ before_install:
       arduino --pref "boardsmanager.additional.urls=http://dan.drown.org/stm32duino/package_STM32duino_index.json" --save-prefs 2>&1;
       arduino --install-boards stm32duino:STM32F1;
 
+    elif [[ "$BOARD" =~ "adafruit:samd:" ]]; then
+      export BUILD_EXAMPLES=true;
+      arduino --pref "boardsmanager.additional.urls=https://www.adafruit.com/package_adafruit_index.json" --save-prefs 2>&1;
+      arduino --install-boards adafruit:samd;
+
     fi
 
   # check if this release commit (or forced build) and if so, build for every board

README.md

@@ -52,6 +52,7 @@ SX127x, RFM9x, SX126x, RF69, SX1231, CC1101, nRF24L01, RFM2x, Si443x and SX128x
   * [__SAMD__](https://github.com/arduino/ArduinoCore-samd) - Arduino Zero, MKR boards, M0 Pro etc.
 
 * __Adafruit__
+  * [__SAMD__](https://github.com/adafruit/ArduinoCore-samd) - Adafruit Feather M0 and M4 boards (Feather, Metro, Gemma, Trinket etc.)
   * [__nRF52__](https://github.com/adafruit/Adafruit_nRF52_Arduino) - Adafruit Feather nRF528x, Bluefruit and CLUE
 
 * __Espressif__

src/BuildOpt.h

@@ -84,8 +84,8 @@
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
 
   #elif defined(SAMD_SERIES)
-    // Arduino SAMD boards - Zero, MKR, etc.
-    #define RADIOLIB_PLATFORM                           "Arduino SAMD"
+    // Arduino SAMD (Zero, MKR, etc.) and Adafruit SAMD boards (M0 and M4)
+    #define RADIOLIB_PLATFORM                           "Arduino/Adafruit SAMD"
     #define RADIOLIB_PIN_TYPE                           uint32_t
     #define RADIOLIB_PIN_MODE                           uint32_t
     #define RADIOLIB_PIN_STATUS                         uint32_t