Merge pull request #57 from caternuson/iss55

Update read for continuous

adafruit_ads1x15/ads1x15.py

@@ -31,9 +31,11 @@ CircuitPython base class driver for ADS1015/1115 ADCs.
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ADS1x15.git"
 
+import time
 from micropython import const
 from adafruit_bus_device.i2c_device import I2CDevice
 
+# pylint: disable=bad-whitespace
 _ADS1X15_DEFAULT_ADDRESS = const(0x48)
 _ADS1X15_POINTER_CONVERSION = const(0x00)
 _ADS1X15_POINTER_CONFIG = const(0x01)
@@ -48,6 +50,7 @@ _ADS1X15_CONFIG_GAIN = {
     8: 0x0800,
     16: 0x0A00,
 }
+# pylint: enable=bad-whitespace
 
 
 class Mode:
@@ -159,7 +162,10 @@ class ADS1x15:
         if self.mode == Mode.CONTINUOUS and self._last_pin_read == pin:
             return self._conversion_value(self.get_last_result(True))
         self._last_pin_read = pin
+        if self.mode == Mode.SINGLE:
             config = _ADS1X15_CONFIG_OS_SINGLE
+        else:
+            config = 0
         config |= (pin & 0x07) << _ADS1X15_CONFIG_MUX_OFFSET
         config |= _ADS1X15_CONFIG_GAIN[self.gain]
         config |= self.mode
@@ -168,8 +174,12 @@ class ADS1x15:
         self._write_register(_ADS1X15_POINTER_CONFIG, config)
 
         if self.mode == Mode.SINGLE:
+            # poll conversion complete status bit
             while not self._conversion_complete():
                 pass
+        else:
+            # just sleep (can't poll in continuous)
+            time.sleep(2 / self.data_rate)
 
         return self._conversion_value(self.get_last_result(False))
 

adafruit_ads1x15/analog_in.py

@@ -28,8 +28,10 @@ differential ADC readings.
 * Author(s): Carter Nelson, adapted from MCP3xxx original by Brent Rubell
 """
 
+# pylint: disable=bad-whitespace
 _ADS1X15_DIFF_CHANNELS = {(0, 1): 0, (0, 3): 1, (1, 3): 2, (2, 3): 3}
 _ADS1X15_PGA_RANGE = {2 / 3: 6.144, 1: 4.096, 2: 2.048, 4: 1.024, 8: 0.512, 16: 0.256}
+# pylint: enable=bad-whitespace
 
 
 class AnalogIn: