Adding typing

.gitignore

@@ -37,6 +37,7 @@ _build
 
 # Virtual environment-specific files
 .env
+.venv
 
 # MacOS-specific files
 *.DS_Store

adafruit_ads1x15/ads1015.py

@@ -12,6 +12,13 @@
 """
 import struct
 
+try:
+    from typing import Dict, List
+
+    from typing_extensions import Literal
+except ImportError:
+    pass
+
 # pylint: disable=unused-import
 from .ads1x15 import ADS1x15, Mode
 
@@ -41,26 +48,25 @@ class ADS1015(ADS1x15):
     """Class for the ADS1015 12 bit ADC."""
 
     @property
-    def bits(self):
+    def bits(self) -> Literal[12]:
         """The ADC bit resolution."""
         return 12
 
     @property
-    def rates(self):
+    def rates(self) -> List[int]:
         """Possible data rate settings."""
         r = list(_ADS1015_CONFIG_DR.keys())
         r.sort()
         return r
 
     @property
-    def rate_config(self):
+    def rate_config(self) -> Dict[int, int]:
         """Rate configuration masks."""
         return _ADS1015_CONFIG_DR
 
-    def _data_rate_default(self) -> int:
+    def _data_rate_default(self) -> Literal[1600]:
         return 1600
 
     def _conversion_value(self, raw_adc: int) -> int:
-        raw_adc = raw_adc.to_bytes(2, "big")
-        value = struct.unpack(">h", raw_adc)[0]
+        value = struct.unpack(">h", raw_adc.to_bytes(2, "big"))[0]
         return value >> 4

adafruit_ads1x15/ads1115.py

@@ -12,6 +12,13 @@
 """
 import struct
 
+try:
+    from typing import Dict, List
+
+    from typing_extensions import Literal
+except ImportError:
+    pass
+
 # pylint: disable=unused-import
 from .ads1x15 import ADS1x15, Mode
 
@@ -42,26 +49,25 @@ class ADS1115(ADS1x15):
     """Class for the ADS1115 16 bit ADC."""
 
     @property
-    def bits(self):
+    def bits(self) -> Literal[16]:
         """The ADC bit resolution."""
         return 16
 
     @property
-    def rates(self):
+    def rates(self) -> List[int]:
         """Possible data rate settings."""
         r = list(_ADS1115_CONFIG_DR.keys())
         r.sort()
         return r
 
     @property
-    def rate_config(self):
+    def rate_config(self) -> Dict[int, int]:
         """Rate configuration masks."""
         return _ADS1115_CONFIG_DR
 
-    def _data_rate_default(self) -> int:
+    def _data_rate_default(self) -> Literal[128]:
         return 128
 
     def _conversion_value(self, raw_adc: int) -> int:
-        raw_adc = raw_adc.to_bytes(2, "big")
-        value = struct.unpack(">h", raw_adc)[0]
+        value = struct.unpack(">h", raw_adc.to_bytes(2, "big"))[0]
         return value

adafruit_ads1x15/ads1x15.py

@@ -15,11 +15,13 @@
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ADS1x15.git"
 
 import time
-from micropython import const
+
 from adafruit_bus_device.i2c_device import I2CDevice
+from micropython import const
 
 try:
-    from typing import Optional
+    from typing import Dict, List, Optional
+
     from busio import I2C
     from microcontroller import Pin
 except ImportError:
@@ -69,66 +71,70 @@ def __init__(
         i2c: I2C,
         gain: float = 1,
         data_rate: Optional[int] = None,
-        mode: Mode = Mode.SINGLE,
+        mode: int = Mode.SINGLE,
         address: int = _ADS1X15_DEFAULT_ADDRESS,
     ):
         # pylint: disable=too-many-arguments
         self._last_pin_read = None
         self.buf = bytearray(3)
-        self._data_rate = self._gain = self._mode = None
         self.gain = gain
         self.data_rate = self._data_rate_default() if data_rate is None else data_rate
         self.mode = mode
         self.i2c_device = I2CDevice(i2c, address)
 
     @property
-    def data_rate(self):
+    def bits(self) -> int:
+        """The ADC bit resolution."""
+        raise NotImplementedError("Subclass must implement bits property.")
+
+    @property
+    def data_rate(self) -> int:
         """The data rate for ADC conversion in samples per second."""
         return self._data_rate
 
     @data_rate.setter
-    def data_rate(self, rate: int):
+    def data_rate(self, rate: int) -> None:
         possible_rates = self.rates
         if rate not in possible_rates:
             raise ValueError("Data rate must be one of: {}".format(possible_rates))
         self._data_rate = rate
 
     @property
-    def rates(self):
+    def rates(self) -> List[int]:
         """Possible data rate settings."""
         raise NotImplementedError("Subclass must implement rates property.")
 
     @property
-    def rate_config(self):
+    def rate_config(self) -> Dict[int, int]:
         """Rate configuration masks."""
         raise NotImplementedError("Subclass must implement rate_config property.")
 
     @property
-    def gain(self):
+    def gain(self) -> float:
         """The ADC gain."""
         return self._gain
 
     @gain.setter
-    def gain(self, gain: float):
+    def gain(self, gain: float) -> None:
         possible_gains = self.gains
         if gain not in possible_gains:
             raise ValueError("Gain must be one of: {}".format(possible_gains))
         self._gain = gain
 
     @property
-    def gains(self):
+    def gains(self) -> List[float]:
         """Possible gain settings."""
         g = list(_ADS1X15_CONFIG_GAIN.keys())
         g.sort()
         return g
 
     @property
-    def mode(self):
+    def mode(self) -> int:
         """The ADC conversion mode."""
         return self._mode
 
     @mode.setter
-    def mode(self, mode: Mode):
+    def mode(self, mode: int) -> None:
         if mode not in (Mode.CONTINUOUS, Mode.SINGLE):
             raise ValueError("Unsupported mode.")
         self._mode = mode

adafruit_ads1x15/analog_in.py

@@ -48,14 +48,14 @@ def __init__(
             self.is_differential = True
 
     @property
-    def value(self):
+    def value(self) -> int:
         """Returns the value of an ADC pin as an integer."""
         return self._ads.read(
             self._pin_setting, is_differential=self.is_differential
         ) << (16 - self._ads.bits)
 
     @property
-    def voltage(self):
+    def voltage(self) -> float:
         """Returns the voltage from the ADC pin as a floating point value."""
         volts = self.value * _ADS1X15_PGA_RANGE[self._ads.gain] / 32767
         return volts

requirements.txt

@@ -4,3 +4,4 @@
 
 Adafruit-Blinka
 adafruit-circuitpython-busdevice
+typing-extensions~=4.0