update change i2c address

Author: naisy

python/VL53L0X.py

@@ -204,6 +204,11 @@ def clear_interrupt(self):
             raise Vl53l0xError('Error clearing VL53L0X interrupt')
 
     def change_address(self, new_address):
+        if self._dev is not None:
+            raise Vl53l0xError('Error changing VL53L0X address')
+
+        self._i2c.open(bus=self._i2c_bus)
+
         if new_address == None:
             return
         elif new_address == self.i2c_address:
@@ -221,3 +226,5 @@ def change_address(self, new_address):
             self._i2c.write_byte_data(self.i2c_address, self.ADDR_I2C_SEC_ADDR, new_address)
 
             self.i2c_address = new_address
+
+        self._i2c.close()

python/VL53L0X_example.py

@@ -27,6 +27,8 @@
 
 # Create a VL53L0X object
 tof = VL53L0X.VL53L0X(i2c_bus=1,i2c_address=0x29)
+# I2C Address can change before tof.open()
+# tof.change_address(0x32)
 tof.open()
 # Start ranging
 tof.start_ranging(VL53L0X.Vl53l0xAccuracyMode.BETTER)