Fix for SPI transaction code

- Fix for compatibility with SoftSPI and SPI_UART
- I seemed to be running two different versions, fixed for compatibility
between RPi and Arduino

RF24.cpp

@@ -67,6 +67,24 @@ void RF24::ce(bool level)
   if (ce_pin != csn_pin) digitalWrite(ce_pin,level);
 }
 
+/****************************************************************************/
+
+  inline void RF24::beginTransaction() {
+    #if defined (RF24_SPI_TRANSACTIONS)
+    _SPI.beginTransaction(SPISettings(RF_SPI_SPEED, MSBFIRST, SPI_MODE0));
+	#endif
+    csn(LOW);
+  }
+
+/****************************************************************************/
+
+  inline void RF24::endTransaction() {
+    csn(HIGH);
+	#if defined (RF24_SPI_TRANSACTIONS)
+    _SPI.endTransaction();
+	#endif
+  }
+
 /****************************************************************************/
 
 uint8_t RF24::read_register(uint8_t reg, uint8_t* buf, uint8_t len)

RF24.h

@@ -81,7 +81,6 @@ private:
   uint32_t txRxDelay; /**< Var for adjusting delays depending on datarate */
   
 
-#if defined (ARDUINO)
 protected:
   /**
    * SPI transactions
@@ -89,21 +88,9 @@ protected:
    * Common code for SPI transactions including CSN toggle
    *
    */
-  inline void beginTransaction() {
-    #if defined (SPI_HAS_TRANSACTION)
-    _SPI.beginTransaction(SPISettings(RF_SPI_SPEED, MSBFIRST, SPI_MODE0));
-	#endif
-    csn(LOW);
-  }
+  inline void beginTransaction();
 
-  inline void endTransaction() {
-    csn(HIGH);
-	#if defined (SPI_HAS_TRANSACTION)
-    _SPI.endTransaction();
-	#endif
-  }
-
-#endif   /* ARDUINO */
+  inline void endTransaction();
 
 public:
 

RF24_config.h

@@ -20,11 +20,15 @@
   //#define MINIMAL
   //#define SPI_UART  // Requires library from https://github.com/TMRh20/Sketches/tree/master/SPI_UART
   //#define SOFTSPI   // Requires library from https://github.com/greiman/DigitalIO
+  
   /**********************/
   #define rf24_max(a,b) (a>b?a:b)
   #define rf24_min(a,b) (a<b?a:b)
 
-	
+  #if defined SPI_HAS_TRANSACTION && !defined SPI_UART && !defined SOFTSPI
+    #define RF24_SPI_TRANSACTIONS
+  #endif
+  
 //Generic Linux/ARM and //http://iotdk.intel.com/docs/master/mraa/
 #if ( defined (__linux) || defined (LINUX) ) && defined( __arm__ ) || defined(MRAA) // BeagleBone Black running GNU/Linux or any other ARM-based linux device