Merge pull request #41 from Red-M/master

Add SPI (MCP23SXX) devices

Author: caternuson

README.rst

@@ -13,7 +13,7 @@ Introduction
     :target: https://github.com/adafruit/Adafruit_CircuitPython_MCP230xx/actions/
     :alt: Build Status
 
-CircuitPython module for the MCP23017 and MCP23008 I2C I/O extenders.
+CircuitPython module for the MCP23017/08 I2C and MCP23S17/08 SPI I/O extenders.
 
 Dependencies
 =============

adafruit_mcp230xx/mcp23017.py

@@ -253,12 +253,13 @@ def io_control(self):
         Bit 4 is whether SDA slew rate is enabled (1 = yes). Bit 5 is if I2C
         address pointer auto-increments (1 = no). Bit 6 is whether interrupt
         pins are internally connected (1 = yes). Bit 7 is whether registers
-        are all in one bank (1 = no).
+        are all in one bank (1 = no), this is silently ignored if set to ``1``.
         """
         return self._read_u8(_MCP23017_IOCON)
 
     @io_control.setter
     def io_control(self, val):
+        val &= ~0x80
         self._write_u8(_MCP23017_IOCON, val)
 
     @property

adafruit_mcp230xx/mcp230xx.py

@@ -1,5 +1,6 @@
 # SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
 # SPDX-FileCopyrightText: 2019 Carter Nelson
+# SPDX-FileCopyrightText: 2021 Red_M
 #
 # SPDX-License-Identifier: MIT
 
@@ -9,10 +10,10 @@
 
 CircuitPython module for the MCP23017 and MCP23008 I2C I/O extenders.
 
-* Author(s): Tony DiCola
+* Author(s): Tony DiCola, Red_M (2021)
 """
 
-from adafruit_bus_device import i2c_device
+from .mcp23xxx import MCP23XXX
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MCP230xx.git"
@@ -24,41 +25,42 @@
 
 
 # pylint: disable=too-few-public-methods
-class MCP230XX:
+class MCP230XX(MCP23XXX):
     """Base class for MCP230xx devices."""
 
-    def __init__(self, i2c, address):
-        self._device = i2c_device.I2CDevice(i2c, address)
-
     def _read_u16le(self, register):
         # Read an unsigned 16 bit little endian value from the specified 8-bit
         # register.
-        with self._device as i2c:
+        with self._device as bus_device:
             _BUFFER[0] = register & 0xFF
 
-            i2c.write_then_readinto(_BUFFER, _BUFFER, out_end=1, in_start=1, in_end=3)
+            bus_device.write_then_readinto(
+                _BUFFER, _BUFFER, out_end=1, in_start=1, in_end=3
+            )
             return (_BUFFER[2] << 8) | _BUFFER[1]
 
     def _write_u16le(self, register, val):
         # Write an unsigned 16 bit little endian value to the specified 8-bit
         # register.
-        with self._device as i2c:
+        with self._device as bus_device:
             _BUFFER[0] = register & 0xFF
             _BUFFER[1] = val & 0xFF
             _BUFFER[2] = (val >> 8) & 0xFF
-            i2c.write(_BUFFER, end=3)
+            bus_device.write(_BUFFER, end=3)
 
     def _read_u8(self, register):
         # Read an unsigned 8 bit value from the specified 8-bit register.
-        with self._device as i2c:
+        with self._device as bus_device:
             _BUFFER[0] = register & 0xFF
 
-            i2c.write_then_readinto(_BUFFER, _BUFFER, out_end=1, in_start=1, in_end=2)
+            bus_device.write_then_readinto(
+                _BUFFER, _BUFFER, out_end=1, in_start=1, in_end=2
+            )
             return _BUFFER[1]
 
     def _write_u8(self, register, val):
         # Write an 8 bit value to the specified 8-bit register.
-        with self._device as i2c:
+        with self._device as bus_device:
             _BUFFER[0] = register & 0xFF
             _BUFFER[1] = val & 0xFF
-            i2c.write(_BUFFER, end=2)
+            bus_device.write(_BUFFER, end=2)

adafruit_mcp230xx/mcp23s08.py

@@ -0,0 +1,94 @@
+# SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
+# SPDX-FileCopyrightText: 2019 Carter Nelson
+# SPDX-FileCopyrightText: 2021 Red_M
+#
+# SPDX-License-Identifier: MIT
+
+"""
+`MCP23S08`
+====================================================
+
+CircuitPython module for the MCP23S08 I2C I/O extenders.
+
+* Author(s): Tony DiCola, Romy Bompart (2020), Red_M (2021)
+"""
+
+from micropython import const
+from .mcp23sxx import MCP23SXX
+from .digital_inout import DigitalInOut
+
+__version__ = "0.0.0-auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MCP23Sxx.git"
+
+_MCP23S08_ADDRESS = const(0x20)
+_MCP23S08_IODIR = const(0x00)
+_MCP23S08_IPOL = const(0x01)
+_MCP23S08_GPINTEN = const(0x02)
+_MCP23S08_DEFVAL = const(0x03)
+_MCP23S08_INTCON = const(0x04)
+_MCP23S08_IOCON = const(0x05)
+_MCP23S08_GPPU = const(0x06)
+_MCP23S08_INTF = const(0x07)
+_MCP23S08_INTCAP = const(0x08)
+_MCP23S08_GPIO = const(0x09)
+
+# pylint: disable=too-many-arguments
+class MCP23S08(MCP23SXX):
+    """Supports MCP23S08 instance on specified I2C bus and optionally
+    at the specified I2C address.
+    """
+
+    def __init__(
+        self, spi, chip_select, address=_MCP23S08_ADDRESS, reset=True, baudrate=100000
+    ):
+        super().__init__(spi, address, chip_select, baudrate=baudrate)
+        # For user information
+        self.address = address
+        if reset:
+            # Reset to all inputs with no pull-ups and no inverted polarity.
+            self.iodir = 0xFF
+            self.gppu = 0x00
+            self._write_u8(_MCP23S08_IPOL, 0x00)
+
+    @property
+    def gpio(self):
+        """The raw GPIO output register.  Each bit represents the
+        output value of the associated pin (0 = low, 1 = high), assuming that
+        pin has been configured as an output previously.
+        """
+        return self._read_u8(_MCP23S08_GPIO)
+
+    @gpio.setter
+    def gpio(self, val):
+        self._write_u8(_MCP23S08_GPIO, val)
+
+    @property
+    def iodir(self):
+        """The raw IODIR direction register.  Each bit represents
+        direction of a pin, either 1 for an input or 0 for an output mode.
+        """
+        return self._read_u8(_MCP23S08_IODIR)
+
+    @iodir.setter
+    def iodir(self, val):
+        self._write_u8(_MCP23S08_IODIR, val)
+
+    @property
+    def gppu(self):
+        """The raw GPPU pull-up register.  Each bit represents
+        if a pull-up is enabled on the specified pin (1 = pull-up enabled,
+        0 = pull-up disabled).  Note pull-down resistors are NOT supported!
+        """
+        return self._read_u8(_MCP23S08_GPPU)
+
+    @gppu.setter
+    def gppu(self, val):
+        self._write_u8(_MCP23S08_GPPU, val)
+
+    def get_pin(self, pin):
+        """Convenience function to create an instance of the DigitalInOut class
+        pointing at the specified pin of this MCP23S08 device.
+        """
+        if not 0 <= pin <= 7:
+            raise ValueError("Pin number must be 0-7.")
+        return DigitalInOut(pin, self)