add example Arduino application

ArduinoI2C/ArduinoI2C.ino

@@ -0,0 +1,56 @@
+
+#include <Wire.h>
+#include "odrive.h"
+
+
+// See odrive.h for a description
+bool I2C_transaction(uint8_t slave_addr, const uint8_t * tx_buffer, size_t tx_length, uint8_t * rx_buffer, size_t rx_length) {
+  // transmit
+  if (tx_buffer) {
+    Wire.beginTransmission(slave_addr);
+    if (Wire.write(tx_buffer, tx_length) != tx_length)
+      return false;
+    bool should_stop = !rx_buffer;
+    if (Wire.endTransmission(should_stop) != 0)
+      return false;
+  }
+
+  // receive
+  if (rx_buffer) {
+    while(Wire.available()) Wire.read(); // flush input buffer
+    if (Wire.requestFrom(slave_addr, (uint8_t)rx_length, (uint8_t)true /* stop after receiving */) != rx_length)
+      return false;
+    for (size_t i = 0; i < rx_length; ++i)
+      rx_buffer[i] = Wire.read();
+  }
+
+  return true;
+}
+
+
+void setup() {
+  Wire.begin(); // join i2c bus (address optional for master)
+  Serial.begin(9600);
+}
+
+byte odrive_num = 7;
+byte x;
+
+void loop() {
+  bool success;
+
+  float val;
+  success = odrive::read_property<odrive::VBUS_VOLTAGE>(odrive_num, &val);
+  if (success) {
+    Serial.println(val, HEX);
+  } else {
+    Serial.println("error");
+  }
+
+  success = odrive::write_property<odrive::TEST_PROPERTY>(odrive_num, x++);
+  if (!success)
+    Serial.println("error");
+
+  delay(500);
+}
+