Add __init__ files and use dynamic absolute path to shared lib

Makefile

@@ -18,7 +18,7 @@ INCLUDES = \
 	-I$(ROOT_DIR)/platform/inc
 
 PYTHON_INCLUDES = \
-    -I/usr/include/python2.7
+    -I/usr/include/python3.5
 
 VPATH = \
 	$(API_DIR)/core/src \

python/VL53L0X.py

@@ -21,51 +21,59 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
-
-import time
+import os
+import smbus2
 from ctypes import *
-import smbus
 
-VL53L0X_GOOD_ACCURACY_MODE      = 0   # Good Accuracy mode
-VL53L0X_BETTER_ACCURACY_MODE    = 1   # Better Accuracy mode
-VL53L0X_BEST_ACCURACY_MODE      = 2   # Best Accuracy mode
-VL53L0X_LONG_RANGE_MODE         = 3   # Longe Range mode
-VL53L0X_HIGH_SPEED_MODE         = 4   # High Speed mode
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+VL53L0X_GOOD_ACCURACY_MODE = 0  # Good Accuracy mode
+VL53L0X_BETTER_ACCURACY_MODE = 1  # Better Accuracy mode
+VL53L0X_BEST_ACCURACY_MODE = 2  # Best Accuracy mode
+VL53L0X_LONG_RANGE_MODE = 3  # Longe Range mode
+VL53L0X_HIGH_SPEED_MODE = 4  # High Speed mode
+
+i2cbus = smbus2.SMBus(1)
 
-i2cbus = smbus.SMBus(1)
 
 # i2c bus read callback
 def i2c_read(address, reg, data_p, length):
-    ret_val = 0;
+    ret_val = 0
     result = []
- 
+
     try:
         result = i2cbus.read_i2c_block_data(address, reg, length)
     except IOError:
-        ret_val = -1; 
+        ret_val = -1
 
-    if (ret_val == 0):
+    if ret_val == 0:
         for index in range(length):
             data_p[index] = result[index]
 
     return ret_val
 
+
 # i2c bus write callback
 def i2c_write(address, reg, data_p, length):
-    ret_val = 0;
+    ret_val = 0
     data = []
 
     for index in range(length):
         data.append(data_p[index])
-    try:
-        i2cbus.write_i2c_block_data(address, reg, data)
-    except IOError:
-        ret_val = -1; 
+
+    if data:
+        try:
+            i2cbus.write_i2c_block_data(address, reg, data)
+        except IOError:
+            ret_val = -1
+        except OverflowError:
+            ret_val = -1
 
     return ret_val
 
-# Load VL53L0X shared lib 
-tof_lib = CDLL("../bin/vl53l0x_python.so")
+
+# Load VL53L0X shared lib
+tof_lib = CDLL(os.path.join(ROOT_DIR, "bin/vl53l0x_python.so"))
 
 # Create read function pointer
 READFUNC = CFUNCTYPE(c_int, c_ubyte, c_ubyte, POINTER(c_ubyte), c_ubyte)
@@ -78,6 +86,7 @@ def i2c_write(address, reg, data_p, length):
 # pass i2c read and write function pointers to VL53L0X library
 tof_lib.VL53L0X_set_i2c(read_func, write_func)
 
+
 class VL53L0X(object):
     """VL53L0X ToF."""
 
@@ -91,10 +100,11 @@ def __init__(self, address=0x29, TCA9548A_Num=255, TCA9548A_Addr=0, **kwargs):
         self.my_object_number = VL53L0X.object_number
         VL53L0X.object_number += 1
 
-    def start_ranging(self, mode = VL53L0X_GOOD_ACCURACY_MODE):
+    def start_ranging(self, mode=VL53L0X_GOOD_ACCURACY_MODE):
         """Start VL53L0X ToF Sensor Ranging"""
-        tof_lib.startRanging(self.my_object_number, mode, self.device_address, self.TCA9548A_Device, self.TCA9548A_Address)
-
+        tof_lib.startRanging(self.my_object_number, mode, self.device_address, self.TCA9548A_Device,
+                             self.TCA9548A_Address)
+
     def stop_ranging(self):
         """Stop VL53L0X ToF Sensor Ranging"""
         tof_lib.stopRanging(self.my_object_number)
@@ -106,12 +116,11 @@ def get_distance(self):
     # This function included to show how to access the ST library directly
     # from python instead of through the simplified interface
     def get_timing(self):
-        Dev = POINTER(c_void_p)
-        Dev = tof_lib.getDev(self.my_object_number)
+        dev = tof_lib.getDev(self.my_object_number)
         budget = c_uint(0)
         budget_p = pointer(budget)
-        Status =  tof_lib.VL53L0X_GetMeasurementTimingBudgetMicroSeconds(Dev, budget_p)
-        if (Status == 0):
-            return (budget.value + 1000)
+        status = tof_lib.VL53L0X_GetMeasurementTimingBudgetMicroSeconds(dev, budget_p)
+        if status == 0:
+            return budget.value + 1000
         else:
             return 0