Merge pull request arduino#12 from bcmi-labs/spi-default-settings

Ensure that sensible SPI settings are configured after `SPI.begin()`

Former-commit-id: fe8b469

Author: aentinger

libraries/SPI/SPI.cpp

@@ -126,6 +126,8 @@ void ArduinoSPI::begin()
     }
     initialized = true;
   }
+
+  beginTransaction(DEFAULT_SPI_SETTINGS);
 }
 
 void ArduinoSPI::end() {

libraries/SPI/SPI.h

@@ -59,7 +59,7 @@ class ArduinoSPI : public SPIClass
 private:
     void enableSciSpiIrqs();
 
-    arduino::SPISettings settings = arduino::SPISettings(0, MSBFIRST, arduino::SPI_MODE0);
+    arduino::SPISettings const DEFAULT_SPI_SETTINGS = arduino::SPISettings(1000000, MSBFIRST, arduino::SPI_MODE0);
     static uint8_t initialized;
     static uint8_t interruptMode; // 0=none, 1=mask, 2=global
     static uint8_t interruptMask; // which interrupts to mask