+#define I2C_OK 0 ///< I2C no errors flag
+#define I2C_DATA_NACK BV(4) ///< I2C generic error
+#define I2C_ERR BV(3) ///< I2C generic error
+#define I2C_ARB_LOST BV(2) ///< I2C arbitration lost error
+#define I2C_START_TIMEOUT BV(0) ///< I2C timeout error on start
+#define I2C_NO_ACK BV(1) ///< I2C no ack for sla start
+
+/*
+ * I2C command flags
+ */
+#define I2C_NOSTOP 0 ///< Do not program the stop for current transition
+#define I2C_STOP BV(0) ///< Program the stop for current transition
+#define I2C_START_R BV(1) ///< Start read command
+#define I2C_START_W 0 ///< Start write command
+
+
+#define I2C_TEST_START(flag) ((flag) & I2C_START_R)
+#define I2C_TEST_STOP(flag) ((flag) & I2C_STOP)