STM32 M3 support

RFM69.cpp

@@ -445,7 +445,11 @@ void RFM69::select() {
   // set RFM69 SPI settings
   SPI.setDataMode(SPI_MODE0);
   SPI.setBitOrder(MSBFIRST);
+#ifdef __arm__
+	SPI.setClockDivider(SPI_CLOCK_DIV16);
+#else
   SPI.setClockDivider(SPI_CLOCK_DIV4); // decided to slow down from DIV2 after SPI stalling in some instances, especially visible on mega1284p when RFM69 and FLASH chip both present
+#endif
   digitalWrite(_slaveSelectPin, LOW);
 }
 

RFM69.h

@@ -41,8 +41,8 @@
   #define RF69_IRQ_PIN          3
   #define RF69_IRQ_NUM          0
 #elif defined(__arm__)//Use pin 10 or any pin you want
-  #define RF69_IRQ_PIN          10
-  #define RF69_IRQ_NUM          10
+  #define RF69_IRQ_PIN          PA3
+  #define RF69_IRQ_NUM          3
 #else 
   #define RF69_IRQ_PIN          2
   #define RF69_IRQ_NUM          0