Adding library and example

adafruit_ads7830/ads7830.py

@@ -0,0 +1,121 @@
+# SPDX-FileCopyrightText: Copyright (c) 2023 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""
+:py:class:`~adafruit_ads7830.ads7830.ADS7830`
+================================================================================
+
+CircuitPython driver for the ADS7830 analog to digital converter
+
+
+* Author(s): Liz Clark
+
+Implementation Notes
+--------------------
+
+**Hardware:**
+
+* `Adafruit ADS7830 8-Channel 8-Bit ADC with I2C <https://www.adafruit.com/product/5836>`_
+
+**Software and Dependencies:**
+
+* Adafruit CircuitPython firmware for the supported boards:
+  https://circuitpython.org/downloads
+
+* Adafruit's Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice
+"""
+
+from adafruit_bus_device.i2c_device import I2CDevice
+from micropython import const
+
+try:
+    import typing  # pylint: disable=unused-import
+    from busio import I2C
+except ImportError:
+    pass
+
+__version__ = "0.0.0+auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ADS7830.git"
+
+_I2C_ADDR = const(0x48)
+
+
+class ADS7830:
+    """Adafruit ADS7830 ADC driver"""
+
+    _POWER_DOWN_MODES = [
+        (True, True),  # power down ref and adc
+        (True, False),  # power down ref and not adc
+        (False, True),  # power down adc and not ref
+        (False, False),  # do not power down ref or adc
+    ]
+    # Single channel selection list
+    _CHANNEL_SELECTION = [
+        0x08,  # SINGLE_CH0
+        0x0C,  # SINGLE_CH1
+        0x09,  # SINGLE_CH2
+        0x0D,  # SINGLE_CH3
+        0x0A,  # SINGLE_CH4
+        0x0E,  # SINGLE_CH5
+        0x0B,  # SINGLE_CH6
+        0x0F,  # SINGLE_CH7
+    ]
+    # Differential channel selection list
+    _DIFF_CHANNEL_SELECTION = [
+        0x00,  # DIFF_CH0_CH1
+        0x04,  # DIFF_CH1_CH0
+        0x01,  # DIFF_CH2_CH3
+        0x05,  # DIFF_CH3_CH2
+        0x02,  # DIFF_CH4_CH5
+        0x06,  # DIFF_CH5_CH4
+        0x03,  # DIFF_CH6_CH7
+        0x07,  # DIFF_CH7_CH6
+    ]
+
+    # pylint: disable=too-many-arguments
+    def __init__(
+        self,
+        i2c: I2C,
+        address: int = _I2C_ADDR,
+        diff_mode: bool = False,
+        int_ref_pd: bool = False,
+        adc_pd: bool = False,
+    ) -> None:
+        """Initialization over I2C
+
+        :param int address: I2C address (default 0x48)
+        :param bool diff_mode: Select differential vs. single mode
+        :param bool int_ref_pd: Power down mode for internal reference (defaults to False)
+        :param bool adc_pd: Power down mode for ADC (defaults to False)
+        """
+        self.i2c_device = I2CDevice(i2c, address)
+        _pd = (int_ref_pd, adc_pd)
+        self.power_down = self._POWER_DOWN_MODES.index(_pd)
+        self.differential_mode = diff_mode
+
+    def read(self, channel: int) -> int:
+        """ADC value
+        Scales the 8-bit ADC value to a 16-bit value
+
+        :param int channel: Channel (0-7)
+        :return: Scaled ADC value or raise an exception if read failed
+        :rtype: int
+        """
+        if channel > 7:
+            raise ValueError("Invalid channel: must be 0-7")
+        if self.differential_mode:
+            command_byte = self._DIFF_CHANNEL_SELECTION[channel // 2]
+        else:
+            command_byte = self._CHANNEL_SELECTION[channel]
+        command_byte <<= 4
+        command_byte |= self.power_down << 2
+
+        with self.i2c_device as i2c:
+            try:
+                # Buffer to store the read ADC value
+                adc_value = bytearray(1)
+                i2c.write_then_readinto(bytearray([command_byte]), adc_value)
+                # Scale the 8-bit value to 16-bit
+                return adc_value[0] << 8
+            except Exception as error:
+                raise RuntimeError(f"Failed to read value: {error}") from error

adafruit_ads7830/analog_in.py

@@ -0,0 +1,34 @@
+# SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+:py:class:`~adafruit_ads7830.analog_in.AnalogIn`
+======================================================
+AnalogIn for ADC readings.
+
+* Author(s): Liz Clark
+
+"""
+
+from adafruit_ads7830.ads7830 import ADS7830
+
+
+class AnalogIn:
+    """AnalogIn Mock Implementation for ADC Reads.
+
+    :param ADS7830 adc: The ADC object.
+    :param int pin: Required pin for reading.
+    """
+
+    def __init__(self, adc: ADS7830, pin: int) -> None:
+        if not isinstance(adc, ADS7830):
+            raise ValueError("ADC object is from the ADS7830 class.")
+        self._adc = adc
+        self._pin = pin
+
+    @property
+    def value(self) -> int:
+        """Returns the value of an ADC pin as an integer in the range [0, 65535]."""
+        result = self._adc.read(self._pin)
+        return result

docs/api.rst

@@ -4,5 +4,8 @@
 .. If your library file(s) are nested in a directory (e.g. /adafruit_foo/foo.py)
 .. use this format as the module name: "adafruit_foo.foo"
 
-.. automodule:: adafruit_ads7830
+.. automodule:: adafruit_ads7830.ads7830
+    :members:
+
+.. automodule:: adafruit_ads7830.analog_in
     :members:

docs/conf.py

@@ -23,18 +23,18 @@
     "sphinx.ext.todo",
 ]
 
-# TODO: Please Read!
-# Uncomment the below if you use native CircuitPython modules such as
-# digitalio, micropython and busio. List the modules you use. Without it, the
-# autodoc module docs will fail to generate with a warning.
-autodoc_mock_imports = ["board", "busio", "micropython"]
+autodoc_mock_imports = [
+    "micropython",
+    "busio",
+    "adafruit_bus_device",
+]
 
 autodoc_preserve_defaults = True
 
 
 intersphinx_mapping = {
-    "python": ("https://docs.python.org/3", None),"BusDevice": ("https://docs.circuitpython.org/projects/busdevice/en/latest/", None),
-    "Register": ("https://docs.circuitpython.org/projects/register/en/latest/", None),
+    "python": ("https://docs.python.org/3", None),
+    "BusDevice": ("https://docs.circuitpython.org/projects/busdevice/en/latest/", None),
     "CircuitPython": ("https://docs.circuitpython.org/en/latest/", None),
 }
 

examples/ads7830_simpletest.py

@@ -1,4 +1,19 @@
-# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
-# SPDX-FileCopyrightText: Copyright (c) 2023 Liz Clark for Adafruit Industries
-#
-# SPDX-License-Identifier: Unlicense
+# SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+# Simple demo to read analog input on channel 0
+
+import time
+import board
+import adafruit_ads7830.ads7830 as ADC
+from adafruit_ads7830.analog_in import AnalogIn
+
+i2c = board.I2C()
+
+# Initialize ADS7830
+adc = ADC.ADS7830(i2c)
+chan = AnalogIn(adc, 0)
+
+while True:
+    print(f"ADC channel 0 = {chan.value}")
+    time.sleep(0.1)

pyproject.toml

@@ -41,7 +41,7 @@ dynamic = ["dependencies", "optional-dependencies"]
 [tool.setuptools]
 # TODO: IF LIBRARY FILES ARE A PACKAGE FOLDER,
 #       CHANGE `py_modules = ['...']` TO `packages = ['...']`
-py-modules = ["adafruit_ads7830"]
+packages = ["adafruit_ads7830"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}