remove unnecessary function bodies

[Adafruit_Blinka-hackapet.git] / src / busio.py

diff --git a/src/busio.py b/src/busio.py
old mode 100755 (executable)
new mode 100644 (file)
index d14dcc5..dd748a5
--- a/src/busio.py
+++ b/src/busio.py
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT

 """
 `busio` - Bus protocol support like I2C and SPI
 =================================================
 """
 `busio` - Bus protocol support like I2C and SPI
 =================================================


@@ -7,51 +10,113 @@ See `CircuitPython:busio` in CircuitPython for more details.
 * Author(s): cefn
 """
 
 * Author(s): cefn
 """
 

-import threading
+try:
+    import threading
+except ImportError:
+    threading = None

 
 

-from adafruit_blinka import Enum, Lockable, agnostic
-from adafruit_blinka.agnostic import board_id, detector
+# pylint: disable=unused-import

 import adafruit_platformdetect.constants.boards as ap_board
 import adafruit_platformdetect.constants.chips as ap_chip
 import adafruit_platformdetect.constants.boards as ap_board
 import adafruit_platformdetect.constants.chips as ap_chip

+from adafruit_blinka import Enum, Lockable, agnostic
+from adafruit_blinka.agnostic import board_id, detector
+
+# pylint: disable=import-outside-toplevel,too-many-branches,too-many-statements
+# pylint: disable=too-many-arguments,too-many-function-args,too-many-return-statements

 
 
 class I2C(Lockable):
 
 
 class I2C(Lockable):

-    def __init__(self, scl, sda, frequency=400000):
+    """
+    Busio I2C Class for CircuitPython Compatibility. Used
+    for both MicroPython and Linux.
+    """
+
+    def __init__(self, scl, sda, frequency=100000):

         self.init(scl, sda, frequency)
 
     def init(self, scl, sda, frequency):
         self.init(scl, sda, frequency)
 
     def init(self, scl, sda, frequency):

+        """Initialization"""

         self.deinit()
         if detector.board.ftdi_ft232h:
         self.deinit()
         if detector.board.ftdi_ft232h:

-            from adafruit_blinka.microcontroller.ft232h.i2c import I2C
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C

 
 

-            self._i2c = I2C(frequency=frequency)
+            self._i2c = _I2C(frequency=frequency)

             return
             return

-        elif detector.board.binho_nova:
-            from adafruit_blinka.microcontroller.nova.i2c import I2C
+        if detector.board.binho_nova:
+            from adafruit_blinka.microcontroller.nova.i2c import I2C as _I2C

 
 

-            self._i2c = I2C(frequency=frequency)
+            self._i2c = _I2C(frequency=frequency)

             return
             return

-        elif detector.board.microchip_mcp2221:
-            from adafruit_blinka.microcontroller.mcp2221.i2c import I2C
+        if detector.board.microchip_mcp2221:
+            from adafruit_blinka.microcontroller.mcp2221.i2c import I2C as _I2C

 
 

-            self._i2c = I2C(frequency=frequency)
+            self._i2c = _I2C(frequency=frequency)

             return
             return

-        elif detector.board.greatfet_one:
-            from adafruit_blinka.microcontroller.nxp_lpc4330.i2c import I2C
+        if detector.board.greatfet_one:
+            from adafruit_blinka.microcontroller.nxp_lpc4330.i2c import I2C as _I2C

 
 

-            self._i2c = I2C(frequency=frequency)
+            self._i2c = _I2C(frequency=frequency)

             return
             return

-        elif detector.board.any_embedded_linux:
+        if detector.board.pico_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import I2C_Pico as _I2C
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.feather_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
+                I2C_Feather as _I2C,
+            )
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.qtpy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import I2C_QTPY as _I2C
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.itsybitsy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
+                I2C_ItsyBitsy as _I2C,
+            )
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.macropad_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
+                I2C_MacroPad as _I2C,
+            )
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.qt2040_trinkey_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.i2c import (
+                I2C_QT2040_Trinkey as _I2C,
+            )
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.chip.id == ap_chip.RP2040:
+            from adafruit_blinka.microcontroller.rp2040.i2c import I2C as _I2C
+
+            self._i2c = _I2C(scl, sda, frequency=frequency)
+            return
+        if detector.board.any_embedded_linux:

             from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
             from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C

+        elif detector.board.ftdi_ft2232h:
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C

         else:
         else:

-            from machine import I2C as _I2C
+            from adafruit_blinka.microcontroller.generic_micropython.i2c import (
+                I2C as _I2C,
+            )

         from microcontroller.pin import i2cPorts
 
         for portId, portScl, portSda in i2cPorts:
             try:
         from microcontroller.pin import i2cPorts
 
         for portId, portScl, portSda in i2cPorts:
             try:

+                # pylint: disable=unexpected-keyword-arg

                 if scl == portScl and sda == portSda:
                     self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
                     break
                 if scl == portScl and sda == portSda:
                     self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
                     break

+                # pylint: enable=unexpected-keyword-arg

             except RuntimeError:
                 pass
         else:
             except RuntimeError:
                 pass
         else:


@@ -60,27 +125,32 @@ class I2C(Lockable):
                     (scl, sda), i2cPorts
                 )
             )
                     (scl, sda), i2cPorts
                 )
             )

-
-        self._lock = threading.RLock()
+        if threading is not None:
+            self._lock = threading.RLock()

 
     def deinit(self):
 
     def deinit(self):

+        """Deinitialization"""

         try:
             del self._i2c
         except AttributeError:
             pass
 
     def __enter__(self):
         try:
             del self._i2c
         except AttributeError:
             pass
 
     def __enter__(self):

-        self._lock.acquire()
+        if threading is not None:
+            self._lock.acquire()

         return self
 
     def __exit__(self, exc_type, exc_value, traceback):
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):

-        self._lock.release()
+        if threading is not None:
+            self._lock.release()

         self.deinit()
 
     def scan(self):
         self.deinit()
 
     def scan(self):

+        """Scan for attached devices"""

         return self._i2c.scan()
 
     def readfrom_into(self, address, buffer, *, start=0, end=None):
         return self._i2c.scan()
 
     def readfrom_into(self, address, buffer, *, start=0, end=None):

+        """Read from a device at specified address into a buffer"""

         if start != 0 or end is not None:
             if end is None:
                 end = len(buffer)
         if start != 0 or end is not None:
             if end is None:
                 end = len(buffer)


@@ -89,15 +159,13 @@ class I2C(Lockable):
         return self._i2c.readfrom_into(address, buffer, stop=stop)
 
     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
         return self._i2c.readfrom_into(address, buffer, stop=stop)
 
     def writeto(self, address, buffer, *, start=0, end=None, stop=True):

+        """Write to a device at specified address from a buffer"""

         if isinstance(buffer, str):
             buffer = bytes([ord(x) for x in buffer])
         if start != 0 or end is not None:
             if end is None:
                 return self._i2c.writeto(address, memoryview(buffer)[start:], stop=stop)
         if isinstance(buffer, str):
             buffer = bytes([ord(x) for x in buffer])
         if start != 0 or end is not None:
             if end is None:
                 return self._i2c.writeto(address, memoryview(buffer)[start:], stop=stop)

-            else:
-                return self._i2c.writeto(
-                    address, memoryview(buffer)[start:end], stop=stop
-                )
+            return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=stop)

         return self._i2c.writeto(address, buffer, stop=stop)
 
     def writeto_then_readfrom(
         return self._i2c.writeto(address, buffer, stop=stop)
 
     def writeto_then_readfrom(


@@ -110,8 +178,11 @@ class I2C(Lockable):
         out_end=None,
         in_start=0,
         in_end=None,
         out_end=None,
         in_start=0,
         in_end=None,

-        stop=False
+        stop=False,

     ):
     ):

+        """ "Write to a device at specified address from a buffer then read
+        from a device at specified address into a buffer
+        """

         return self._i2c.writeto_then_readfrom(
             address,
             buffer_out,
         return self._i2c.writeto_then_readfrom(
             address,
             buffer_out,


@@ -125,40 +196,95 @@ class I2C(Lockable):
 
 
 class SPI(Lockable):
 
 
 class SPI(Lockable):

+    """
+    Busio SPI Class for CircuitPython Compatibility. Used
+    for both MicroPython and Linux.
+    """
+

     def __init__(self, clock, MOSI=None, MISO=None):
         self.deinit()
         if detector.board.ftdi_ft232h:
     def __init__(self, clock, MOSI=None, MISO=None):
         self.deinit()
         if detector.board.ftdi_ft232h:

-            from adafruit_blinka.microcontroller.ft232h.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.ft232h.pin import SCK, MOSI, MISO
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import SPI as _SPI
+            from adafruit_blinka.microcontroller.ftdi_mpsse.ft232h.pin import (
+                SCK,
+                MOSI,
+                MISO,
+            )

 
             self._spi = _SPI()
             self._pins = (SCK, MOSI, MISO)
             return
 
             self._spi = _SPI()
             self._pins = (SCK, MOSI, MISO)
             return

-        elif detector.board.binho_nova:
+        if detector.board.binho_nova:

             from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.nova.pin import SCK, MOSI, MISO
 
             self._spi = _SPI(clock)
             self._pins = (SCK, MOSI, MISO)
             return
             from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.nova.pin import SCK, MOSI, MISO
 
             self._spi = _SPI(clock)
             self._pins = (SCK, MOSI, MISO)
             return

-        elif detector.board.greatfet_one:
+        if detector.board.greatfet_one:

             from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.nxp_lpc4330.pin import SCK, MOSI, MISO
 
             self._spi = _SPI()
             self._pins = (SCK, MOSI, MISO)
             return
             from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.nxp_lpc4330.pin import SCK, MOSI, MISO
 
             self._spi = _SPI()
             self._pins = (SCK, MOSI, MISO)
             return

-        elif detector.board.any_embedded_linux:
+        if detector.board.pico_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_Pico as _SPI
+
+            self._spi = _SPI(clock)  # this is really all that's needed
+            self._pins = (clock, clock, clock)  # will determine MOSI/MISO from clock
+            return
+        if detector.board.feather_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_Feather as _SPI,
+            )
+
+            self._spi = _SPI(clock)  # this is really all that's needed
+            self._pins = (clock, clock, clock)  # will determine MOSI/MISO from clock
+            return
+        if detector.board.itsybitsy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_ItsyBitsy as _SPI,
+            )
+
+            self._spi = _SPI(clock)  # this is really all that's needed
+            self._pins = (clock, clock, clock)  # will determine MOSI/MISO from clock
+            return
+        if detector.board.macropad_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_MacroPad as _SPI,
+            )
+
+            self._spi = _SPI(clock)  # this is really all that's needed
+            self._pins = (clock, clock, clock)  # will determine MOSI/MISO from clock
+            return
+        if detector.board.qtpy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_QTPY as _SPI
+
+            self._spi = _SPI(clock)  # this is really all that's needed
+            self._pins = (clock, clock, clock)  # will determine MOSI/MISO from clock
+            return
+        if detector.chip.id == ap_chip.RP2040:
+            from adafruit_blinka.microcontroller.rp2040.spi import SPI as _SPI
+
+            self._spi = _SPI(clock, MOSI, MISO)  # Pins configured on instantiation
+            self._pins = (clock, clock, clock)  # These don't matter, they're discarded
+            return
+        if detector.board.any_embedded_linux:

             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI

+        elif detector.board.ftdi_ft2232h:
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import SPI as _SPI

         else:
         else:

-            from machine import SPI as _SPI
+            from adafruit_blinka.microcontroller.generic_micropython.spi import (
+                SPI as _SPI,
+            )

         from microcontroller.pin import spiPorts
 
         for portId, portSck, portMosi, portMiso in spiPorts:
             if (
                 (clock == portSck)
         from microcontroller.pin import spiPorts
 
         for portId, portSck, portMosi, portMiso in spiPorts:
             if (
                 (clock == portSck)

-                and (MOSI == portMosi or MOSI == None)  # Clock is required!
-                and (MISO == portMiso or MISO == None)  # But can do with just output
+                and MOSI in (portMosi, None)  # Clock is required!
+                and MISO in (portMiso, None)  # But can do with just output

             ):  # Or just input
                 self._spi = _SPI(portId)
                 self._pins = (portSck, portMosi, portMiso)
             ):  # Or just input
                 self._spi = _SPI(portId)
                 self._pins = (portSck, portMosi, portMiso)


@@ -171,79 +297,47 @@ class SPI(Lockable):
             )
 
     def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):
             )
 
     def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):

-        if detector.board.any_raspberry_pi or detector.board.any_raspberry_pi_40_pin:
-            from adafruit_blinka.microcontroller.bcm283x.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif detector.board.any_beaglebone:
-            from adafruit_blinka.microcontroller.am335x.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif detector.board.any_orange_pi and detector.chip.id == ap_chip.SUN8I:
-            from adafruit_blinka.microcontroller.allwinner.h3.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.GIANT_BOARD:
-            from adafruit_blinka.microcontroller.sama5.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.CORAL_EDGE_TPU_DEV:
-            from adafruit_blinka.microcontroller.nxp_imx8m.pin import Pin
+        """Update the configuration"""
+        if detector.board.any_nanopi and detector.chip.id == ap_chip.SUN8I:

             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI

-        elif board_id == ap_board.ODROID_C2:
-            from adafruit_blinka.microcontroller.amlogic.s905.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.ODROID_C4:
-            from adafruit_blinka.microcontroller.amlogic.s905x3.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.ODROID_XU4:
-            from adafruit_blinka.microcontroller.samsung.exynos5422.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.DRAGONBOARD_410C:
-            from adafruit_blinka.microcontroller.snapdragon.apq8016.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.JETSON_NANO:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.tegra.t210.pin import Pin
-        elif board_id == ap_board.JETSON_TX1:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.tegra.t210.pin import Pin
-        elif board_id == ap_board.JETSON_TX2:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.tegra.t186.pin import Pin
-        elif board_id == ap_board.JETSON_XAVIER:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.tegra.t194.pin import Pin
-        elif board_id == ap_board.JETSON_NX:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.tegra.t194.pin import Pin
-        elif detector.board.ROCK_PI_S:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.rockchip.rk3308.pin import Pin
-        elif detector.board.SIFIVE_UNLEASHED:
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.hfu540.pin import Pin

         elif detector.board.ftdi_ft232h:
         elif detector.board.ftdi_ft232h:

-            from adafruit_blinka.microcontroller.ft232h.spi import SPI as _SPI
-            from adafruit_blinka.microcontroller.ft232h.pin import Pin
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import (
+                SPI as _SPI,
+            )
+        elif detector.board.ftdi_ft2232h:
+            from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.spi import (
+                SPI as _SPI,
+            )

         elif detector.board.binho_nova:
             from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI
         elif detector.board.binho_nova:
             from adafruit_blinka.microcontroller.nova.spi import SPI as _SPI

-            from adafruit_blinka.microcontroller.nova.pin import Pin

         elif detector.board.greatfet_one:
             from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI
         elif detector.board.greatfet_one:
             from adafruit_blinka.microcontroller.nxp_lpc4330.spi import SPI as _SPI

-            from adafruit_blinka.microcontroller.nxp_lpc4330.pin import Pin
-        elif (
-            board_id == ap_board.PINE64
-            or board_id == ap_board.PINEBOOK
-            or board_id == ap_board.PINEPHONE
-        ):
-            from adafruit_blinka.microcontroller.allwinner.a64.pin import Pin
-            from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
-        elif board_id == ap_board.CLOCKWORK_CPI3:
-            from adafruit_blinka.microcontroller.allwinner.a33.pin import Pin
+        elif detector.board.any_lubancat and detector.chip.id == ap_chip.IMX6ULL:

             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI

-        elif board_id == ap_board.ONION_OMEGA2:
-            from adafruit_blinka.microcontroller.mips24kec.pin import Pin
+        elif detector.board.pico_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_Pico as _SPI
+        elif detector.board.feather_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_Feather as _SPI,
+            )
+        elif detector.board.itsybitsy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_ItsyBitsy as _SPI,
+            )
+        elif detector.board.macropad_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import (
+                SPI_MacroPad as _SPI,
+            )
+        elif detector.board.qtpy_u2if:
+            from adafruit_blinka.microcontroller.rp2040_u2if.spi import SPI_QTPY as _SPI
+        elif detector.chip.id == ap_chip.RP2040:
+            from adafruit_blinka.microcontroller.rp2040.spi import SPI as _SPI
+        elif detector.board.any_embedded_linux:

             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
         else:
             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
         else:

-            from machine import SPI as _SPI
-            from machine import Pin
+            from adafruit_blinka.microcontroller.generic_micropython.spi import (
+                SPI as _SPI,
+            )

 
         if self._locked:
             # TODO check if #init ignores MOSI=None rather than unsetting, to save _pinIds attribute
 
         if self._locked:
             # TODO check if #init ignores MOSI=None rather than unsetting, to save _pinIds attribute


@@ -253,43 +347,52 @@ class SPI(Lockable):
                 phase=phase,
                 bits=bits,
                 firstbit=_SPI.MSB,
                 phase=phase,
                 bits=bits,
                 firstbit=_SPI.MSB,

-                sck=Pin(self._pins[0].id),
-                mosi=Pin(self._pins[1].id),
-                miso=Pin(self._pins[2].id),

             )
         else:
             raise RuntimeError("First call try_lock()")
 
     def deinit(self):
             )
         else:
             raise RuntimeError("First call try_lock()")
 
     def deinit(self):

+        """Deinitialization"""

         self._spi = None
         self._pinIds = None
 
     @property
     def frequency(self):
         self._spi = None
         self._pinIds = None
 
     @property
     def frequency(self):

+        """Return the baud rate if implemented"""

         try:
             return self._spi.frequency
         try:
             return self._spi.frequency

-        except AttributeError:
+        except AttributeError as error:

             raise NotImplementedError(
                 "Frequency attribute not implemented for this platform"
             raise NotImplementedError(
                 "Frequency attribute not implemented for this platform"

-            )
+            ) from error

 
     def write(self, buf, start=0, end=None):
 
     def write(self, buf, start=0, end=None):

+        """Write to the SPI device"""

         return self._spi.write(buf, start, end)
 
     def readinto(self, buf, start=0, end=None, write_value=0):
         return self._spi.write(buf, start, end)
 
     def readinto(self, buf, start=0, end=None, write_value=0):

+        """Read from the SPI device into a buffer"""

         return self._spi.readinto(buf, start, end, write_value=write_value)
 
     def write_readinto(
         self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None
     ):
         return self._spi.readinto(buf, start, end, write_value=write_value)
 
     def write_readinto(
         self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None
     ):

+        """Write to the SPI device and read from the SPI device into a buffer"""

         return self._spi.write_readinto(
             buffer_out, buffer_in, out_start, out_end, in_start, in_end
         )
 
 
 class UART(Lockable):
         return self._spi.write_readinto(
             buffer_out, buffer_in, out_start, out_end, in_start, in_end
         )
 
 
 class UART(Lockable):

+    """
+    Busio UART Class for CircuitPython Compatibility. Used
+    for MicroPython and a few other non-Linux boards.
+    """
+

     class Parity(Enum):
     class Parity(Enum):

-        pass
+        """Parity Enumeration"""
+
+        pass  # pylint: disable=unnecessary-pass

 
     Parity.ODD = Parity()
     Parity.EVEN = Parity()
 
     Parity.ODD = Parity()
     Parity.EVEN = Parity()


@@ -310,17 +413,16 @@ class UART(Lockable):
             raise RuntimeError(
                 "busio.UART not supported on this platform. Please use pyserial instead."
             )
             raise RuntimeError(
                 "busio.UART not supported on this platform. Please use pyserial instead."
             )

-        elif detector.board.binho_nova:
+        if detector.board.binho_nova:

             from adafruit_blinka.microcontroller.nova.uart import UART as _UART
         elif detector.board.greatfet_one:
             from adafruit_blinka.microcontroller.nxp_lpc4330.uart import UART as _UART
             from adafruit_blinka.microcontroller.nova.uart import UART as _UART
         elif detector.board.greatfet_one:
             from adafruit_blinka.microcontroller.nxp_lpc4330.uart import UART as _UART

+        elif detector.chip.id == ap_chip.RP2040:
+            from adafruit_blinka.microcontroller.rp2040.uart import UART as _UART

         else:
             from machine import UART as _UART
 
         else:
             from machine import UART as _UART
 

-        if detector.board.binho_nova:
-            from adafruit_blinka.microcontroller.nova.pin import uartPorts
-        else:
-            from microcontroller.pin import uartPorts
+        from microcontroller.pin import uartPorts

 
         self.baudrate = baudrate
 
 
         self.baudrate = baudrate
 


@@ -339,39 +441,54 @@ class UART(Lockable):
         else:
             raise ValueError("Invalid parity")
 
         else:
             raise ValueError("Invalid parity")
 

-        # check tx and rx have hardware support
-        for portId, portTx, portRx in uartPorts:  #
-            if portTx == tx and portRx == rx:
-                self._uart = _UART(
-                    portId,
-                    baudrate,
-                    bits=bits,
-                    parity=parity,
-                    stop=stop,
-                    timeout=timeout,
-                    read_buf_len=receiver_buffer_size,
-                )
-                break
+        if detector.chip.id == ap_chip.RP2040:
+            self._uart = _UART(
+                tx,
+                rx,
+                baudrate=baudrate,
+                bits=bits,
+                parity=parity,
+                stop=stop,
+            )

         else:
         else:

-            raise ValueError(
-                "No Hardware UART on (tx,rx)={}\nValid UART ports: {}".format(
-                    (tx, rx), uartPorts
+            # check tx and rx have hardware support
+            for portId, portTx, portRx in uartPorts:  #
+                if portTx == tx and portRx == rx:
+                    self._uart = _UART(
+                        portId,
+                        baudrate,
+                        bits=bits,
+                        parity=parity,
+                        stop=stop,
+                        timeout=timeout,
+                        read_buf_len=receiver_buffer_size,
+                    )
+                    break
+            else:
+                raise ValueError(
+                    "No Hardware UART on (tx,rx)={}\nValid UART ports: {}".format(
+                        (tx, rx), uartPorts
+                    )

                 )
                 )

-            )

 
     def deinit(self):
 
     def deinit(self):

+        """Deinitialization"""

         if detector.board.binho_nova:
             self._uart.deinit()
         self._uart = None
 
     def read(self, nbytes=None):
         if detector.board.binho_nova:
             self._uart.deinit()
         self._uart = None
 
     def read(self, nbytes=None):

+        """Read from the UART"""

         return self._uart.read(nbytes)
 
     def readinto(self, buf, nbytes=None):
         return self._uart.read(nbytes)
 
     def readinto(self, buf, nbytes=None):

+        """Read from the UART into a buffer"""

         return self._uart.readinto(buf, nbytes)
 
     def readline(self):
         return self._uart.readinto(buf, nbytes)
 
     def readline(self):

+        """Read a line of characters up to a newline charater from the UART"""

         return self._uart.readline()
 
     def write(self, buf):
         return self._uart.readline()
 
     def write(self, buf):

+        """Write to the UART from a buffer"""

         return self._uart.write(buf)
         return self._uart.write(buf)