Adding wait for Serial to setup

-With native USB boards, it is necessary to wait for Serial to become available. If you don't it can cause com port enumeration issues and your computer can show errors like "device not recognized".
-Updated INT and RST pin arguments to SIGNED ints. They were previously UNSIGNED, and therefore could never be the "-1" (which indicates we don't want to use them)

Author: lewispg228

examples/Example_01_RotationVector/Example_01_RotationVector.ino

@@ -37,14 +37,29 @@
 #include "SparkFun_BNO08x_Arduino_Library.h"  // CTRL+Click here to get the library: http://librarymanager/All#SparkFun_BNO08x
 BNO08x myIMU;
 
+// For reliable interaction with the SHTP bus, we need
+// to use hardware reset control, and monitor the H_INT pin
+// The H_INT pin will go low when its okay to talk on the SHTP bus.
+// Note, these can be other GPIO if you like.
+// Do not define (or set to -1) to not user these features.
+#define BNO08X_INT  4
+//#define BNO08X_INT  -1
+#define BNO08X_RST  22
+//#define BNO08X_RST  -1
+
+#define BNO08X_ADDR 0x4B  // SparkFun BNO08x Breakout (Qwiic) defaults to 0x4B
+//#define BNO08X_ADDR 0x4A // Alternate address if ADR jumper is closed
+
 void setup() {
+  while(!Serial); // Wait for Serial to become available.
+                  // Necessary for boards with native USB (like the SAMD51 Thing+).
   Serial.begin(115200);
   Serial.println();
   Serial.println("BNO08x Read Example");
 
   Wire.begin();
 
-  if (myIMU.begin() == false) {
+  if (myIMU.begin(BNO08X_ADDR, Wire, BNO08X_INT, BNO08X_RST) == false) {
     Serial.println("BNO08x not detected at default I2C address. Check your jumpers and the hookup guide. Freezing...");
     while (1)
       ;

src/SparkFun_BNO08x_Arduino_Library.cpp

@@ -87,7 +87,7 @@ size_t maxBufferSize();
 
 //Initializes the sensor with basic settings using I2C
 //Returns false if sensor is not detected
-boolean BNO08x::begin(uint8_t deviceAddress, TwoWire &wirePort, uint8_t user_INTPin, uint8_t user_RSTPin)
+boolean BNO08x::begin(uint8_t deviceAddress, TwoWire &wirePort, int8_t user_INTPin, int8_t user_RSTPin)
 {
   	_deviceAddress = deviceAddress;
   	_i2cPort = &wirePort;

src/SparkFun_BNO08x_Arduino_Library.h

@@ -144,7 +144,7 @@
 class BNO08x
 {
 public:
-	boolean begin(uint8_t deviceAddress = BNO08x_DEFAULT_ADDRESS, TwoWire &wirePort = Wire, uint8_t user_INTPin = -1, uint8_t user_RSTPin = -1); //By default use the default I2C addres, and use Wire port
+	boolean begin(uint8_t deviceAddress = BNO08x_DEFAULT_ADDRESS, TwoWire &wirePort = Wire, int8_t user_INTPin = -1, int8_t user_RSTPin = -1); //By default use the default I2C addres, and use Wire port
 	boolean beginSPI(uint8_t user_CSPin, uint8_t user_INTPin, uint8_t user_RSTPin, uint32_t spiPortSpeed = 1000000, SPIClass &spiPort = SPI);
 	boolean isConnected();