Added ESP32 directive

Author: marshalltaylorSFE

src/SparkFunBME280.cpp

@@ -65,7 +65,6 @@ uint8_t BME280::begin()
 {
 	//Check the settings structure values to determine how to setup the device
 	uint8_t dataToWrite = 0;  //Temporary variable
-
 	switch (settings.commInterface)
 	{
 
@@ -76,6 +75,14 @@ uint8_t BME280::begin()
 	case SPI_MODE:
 		// start the SPI library:
 		SPI.begin();
+		#ifdef ARDUINO_ARCH_ESP32
+		SPI.setFrequency(1000000);
+		// Data is read and written MSb first.
+		SPI.setBitOrder(SPI_MSBFIRST);
+		// Like the standard arduino/teensy comment below, mode0 seems wrong according to standards
+		// but conforms to the timing diagrams when used for the ESP32
+		SPI.setDataMode(SPI_MODE0);
+		#else
 		// Maximum SPI frequency is 10MHz, could divide by 2 here:
 		SPI.setClockDivider(SPI_CLOCK_DIV32);
 		// Data is read and written MSb first.
@@ -85,6 +92,7 @@ uint8_t BME280::begin()
 		// This was SPI_MODE3 for RedBoard, but I had to change to
 		// MODE0 for Teensy 3.1 operation
 		SPI.setDataMode(SPI_MODE3);
+		#endif
 		// initalize the  data ready and chip select pins:
 		pinMode(settings.chipSelectPin, OUTPUT);
 		digitalWrite(settings.chipSelectPin, HIGH);