Merge pull request #35 from imgrant/catch-init-ioerror

Catch IOError, raise as RuntimeError in init()

Author: Gadgetoid

examples/compensated-temperature.py

@@ -15,7 +15,7 @@
 
 try:
     sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
-except IOError:
+except (RuntimeError, IOError):
     sensor = bme680.BME680(bme680.I2C_ADDR_SECONDARY)
 
 # These oversampling settings can be tweaked to

examples/indoor-air-quality.py

@@ -15,7 +15,7 @@
 
 try:
     sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
-except IOError:
+except (RuntimeError, IOError):
     sensor = bme680.BME680(bme680.I2C_ADDR_SECONDARY)
 
 # These oversampling settings can be tweaked to

examples/read-all.py

@@ -11,7 +11,7 @@
 
 try:
     sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
-except IOError:
+except (RuntimeError, IOError):
     sensor = bme680.BME680(bme680.I2C_ADDR_SECONDARY)
 
 # These calibration data can safely be commented

examples/temperature-offset.py

@@ -10,7 +10,7 @@
 
 try:
     sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
-except IOError:
+except (RuntimeError, IOError):
     sensor = bme680.BME680(bme680.I2C_ADDR_SECONDARY)
 
 # These oversampling settings can be tweaked to

examples/temperature-pressure-humidity.py

@@ -13,7 +13,7 @@
 
 try:
     sensor = bme680.BME680(bme680.I2C_ADDR_PRIMARY)
-except IOError:
+except (RuntimeError, IOError):
     sensor = bme680.BME680(bme680.I2C_ADDR_SECONDARY)
 
 # These oversampling settings can be tweaked to

library/bme680/__init__.py

@@ -42,9 +42,12 @@ def __init__(self, i2c_addr=constants.I2C_ADDR_PRIMARY, i2c_device=None):
             import smbus
             self._i2c = smbus.SMBus(1)
 
-        self.chip_id = self._get_regs(constants.CHIP_ID_ADDR, 1)
-        if self.chip_id != constants.CHIP_ID:
-            raise RuntimeError('BME680 Not Found. Invalid CHIP ID: 0x{0:02x}'.format(self.chip_id))
+        try:
+            self.chip_id = self._get_regs(constants.CHIP_ID_ADDR, 1)
+            if self.chip_id != constants.CHIP_ID:
+                raise RuntimeError('BME680 Not Found. Invalid CHIP ID: 0x{0:02x}'.format(self.chip_id))
+        except IOError:
+            raise RuntimeError("Unable to identify BME680 at 0x{:02x} (IOError)".format(self.i2c_addr))
 
         self.soft_reset()
         self.set_power_mode(constants.SLEEP_MODE)