fixed : complie error on other Arduino hardware emvironment

*add include arduino.h
*fixed : formula at SPI_HAS_TRANSACTION (#if -> #ifdef)

Author: nmori

src/SakuraIO_SPI.cpp

@@ -1,13 +1,14 @@
+#include <Arduino.h>
 #include <SPI.h>
 #include "SakuraIO.h"
 #include "SakuraIO/debug.h"
 
-#if SPI_HAS_TRANSACTION
+#ifdef SPI_HAS_TRANSACTION
 static SPISettings settings;
 #endif
 
 void SakuraIO_SPI::begin(){
-#if SPI_HAS_TRANSACTION
+#ifdef SPI_HAS_TRANSACTION
   SPI.beginTransaction(settings);
 #endif
   dbgln("CS=0");
@@ -17,7 +18,7 @@ void SakuraIO_SPI::begin(){
 void SakuraIO_SPI::end(){
   dbgln("CS=1");
   digitalWrite(cs, HIGH);
-#if SPI_HAS_TRANSACTION
+#ifdef SPI_HAS_TRANSACTION
   SPI.endTransaction();
 #endif
   delayMicroseconds(20);
@@ -47,7 +48,7 @@ uint8_t SakuraIO_SPI::receiveByte(){
 SakuraIO_SPI::SakuraIO_SPI(int _cs){
   cs = _cs;
   SPI.begin();
-#if SPI_HAS_TRANSACTION
+#ifdef SPI_HAS_TRANSACTION
   settings = SPISettings(350000, MSBFIRST, SPI_MODE0); // 350kHz, MSB First, SPI mode 0
 #endif
   pinMode(cs, OUTPUT);