Initial commit.

.gitignore

@@ -0,0 +1 @@
+*.pyc

Adafruit_GPIO/GPIO.py

@@ -0,0 +1,160 @@
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import platform
+
+
+OUT 	= 0
+IN 		= 1
+HIGH 	= True
+LOW 	= False
+
+
+class BaseGPIO(object):
+	"""Base class for implementing simple digital IO for a platform.
+	Implementors are expected to subclass from this and provide an implementation
+	of the setup, output, and input functions."""
+
+	def setup(self, pin, mode):
+		"""Set the input or output mode for a specified pin.  Mode should be
+		either OUT or IN."""
+		raise NotImplementedError
+
+	def output(self, pin, value):
+		"""Set the specified pin the provided high/low value.  Value should be
+		either HIGH/LOW or a boolean (true = high)."""
+		raise NotImplementedError
+
+	def input(self, pin):
+		"""Read the specified pin and return HIGH/true if the pin is pulled high,
+		or LOW/false if pulled low."""
+		raise NotImplementedError
+
+	def set_high(self, pin):
+		"""Set the specified pin HIGH."""
+		self.output(pin, HIGH)
+
+	def set_low(self, pin):
+		"""Set the specified pin LOW."""
+		self.output(pin, LOW)
+
+	def is_high(self, pin):
+		"""Return true if the specified pin is pulled high."""
+		return self.input(pin) == HIGH
+
+	def is_low(self, pin):
+		"""Return true if the specified pin is pulled low."""
+		return self.input(pin) == LOW
+
+
+class RPiGPIOAdapter(BaseGPIO):
+	"""GPIO implementation for the Raspberry Pi using the RPi.GPIO library."""
+
+	def __init__(self, rpi_gpio, mode=None):
+		self.rpi_gpio = rpi_gpio
+		# Suppress warnings about GPIO in use.
+		rpi_gpio.setwarnings(False)
+		if mode == rpi_gpio.BOARD or mode == rpi_gpio.BCM:
+			rpi_gpio.setmode(mode)
+		elif mode is not None:
+			raise ValueError('Unexpected value for mode.  Must be BOARD or BCM.')
+		else:
+			# Default to BCM numbering if not told otherwise.
+			rpi_gpio.setmode(rpi_gpio.BCM)
+
+	def setup(self, pin, mode):
+		"""Set the input or output mode for a specified pin.  Mode should be
+		either OUTPUT or INPUT.
+		"""
+		self.rpi_gpio.setup(pin, self.rpi_gpio.IN if mode == IN else \
+								 self.rpi_gpio.OUT)
+
+	def output(self, pin, value):
+		"""Set the specified pin the provided high/low value.  Value should be
+		either HIGH/LOW or a boolean (true = high).
+		"""
+		self.rpi_gpio.output(pin, value)
+
+	def input(self, pin):
+		"""Read the specified pin and return HIGH/true if the pin is pulled high,
+		or LOW/false if pulled low.
+		"""
+		return self.rpi_gpio.input(pin)
+
+
+class AdafruitBBIOAdapter(BaseGPIO):
+	"""GPIO implementation for the Beaglebone Black using the Adafruit_BBIO
+	library.
+	"""
+
+	def __init__(self, bbio_gpio):
+		self.bbio_gpio = bbio_gpio
+
+	def setup(self, pin, mode):
+		"""Set the input or output mode for a specified pin.  Mode should be
+		either OUTPUT or INPUT.
+		"""
+		self.bbio_gpio.setup(pin, self.bbio_gpio.IN if mode == IN else \
+								  self.bbio_gpio.OUT)
+
+	def output(self, pin, value):
+		"""Set the specified pin the provided high/low value.  Value should be
+		either HIGH/LOW or a boolean (true = high).
+		"""
+		self.bbio_gpio.output(pin, value)
+
+	def input(self, pin):
+		"""Read the specified pin and return HIGH/true if the pin is pulled high,
+		or LOW/false if pulled low.
+		"""
+		return self.bbio_gpio.input(pin)
+
+
+def get_platform_gpio(plat=platform.platform(), **keywords):
+	"""Attempt to return a GPIO instance for the platform which the code is being
+	executed on.  Currently supports only the Raspberry Pi using the RPi.GPIO
+	library and Beaglebone Black using the Adafruit_BBIO library.  Will throw an
+	exception if a GPIO instance can't be created for the current platform.  The
+	returned GPIO object is an instance of BaseGPIO.
+	"""
+	if plat is None:
+		raise RuntimeError('Could not determine platform type.')
+	
+	# TODO: Is there a better way to check if running on BBB or Pi?  Relying on
+	# the architecture name is brittle because new boards running armv6 or armv7
+	# might come along and conflict with this simple identification scheme.
+	
+	# Handle Raspberry Pi
+	# Platform output on Raspbian testing/jessie ~May 2014:
+	# Linux-3.10.25+-armv6l-with-debian-7.4
+	if plat.lower().find('armv6l-with-debian') > -1:
+		import RPi.GPIO
+		return RPiGPIOAdapter(RPi.GPIO, **keywords)
+
+	# Handle Beaglebone Black
+	# Platform output on Debian ~May 2014:
+	# Linux-3.8.13-bone47-armv7l-with-debian-7.4
+	if plat.lower().find('armv7l-with-debian') > -1:
+		import Adafruit_BBIO.GPIO
+		return AdafruitBBIOAdapter(Adafruit_BBIO.GPIO, **keywords)
+
+	# Couldn't determine platform, raise error.
+	raise RuntimeError('Unsupported platform: {0}'.format(plat))

Adafruit_GPIO/SPI.py

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+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import operator
+import time
+
+import spidev
+
+import Adafruit_GPIO as GPIO
+
+
+MSBFIRST = 0
+LSBFIRST = 1
+
+
+class SpiDev(object):
+	"""Hardware-based SPI implementation using the spidev interface."""
+
+	def __init__(self, port, device, max_speed_hz=500000):
+		"""Initialize an SPI device using the SPIdev interface.  Port and device
+		identify the device, for example the device /dev/spidev1.0 would be port
+		1 and device 0.
+		"""
+		self._device = spidev.SpiDev()
+		self._device.open(port, device)
+		self._device.max_speed_hz=max_speed_hz
+
+	def set_clock_hz(self, hz):
+		"""Set the speed of the SPI clock in hertz.  Note that not all speeds
+		are supported and a lower speed might be chosen by the hardware.
+		"""
+		self._device.max_speed_hz=hz
+
+	def set_mode(self, mode):
+		"""Set SPI mode which controls clock polarity and phase.  Should be a 
+		numeric value 0, 1, 2, or 3.  See wikipedia page for details on meaning:
+		http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus
+		"""
+		if mode < 0 or mode > 3:
+			raise ValueError('Mode must be a value 0, 1, 2, or 3.')
+		self._device.mode = mode
+
+	def set_bit_order(self, order):
+		"""Set order of bits to be read/written over serial lines.  Should be
+		either MSBFIRST for most-significant first, or LSBFIRST for
+		least-signifcant first.
+		"""
+		if order == MSBFIRST:
+			self._device.lsbfirst = False
+		elif order == LSBFIRST:
+			self._device.lsbfirst = True
+		else:
+			raise ValueError('Order must be MSBFIRST or LSBFIRST.')
+
+	def close(self):
+		"""Close communication with the SPI device."""
+		self._device.close()
+
+	def write(self, data):
+		"""Half-duplex SPI write.  The specified array of bytes will be clocked
+		out the MOSI line.
+		"""
+		self._device.writebytes(data)
+
+	def read(self, length):
+		"""Half-duplex SPI read.  The specified length of bytes will be clocked
+		in the MISO line and returned as a bytearray object.
+		"""
+		return bytearray(self._device.readbytes(length))
+
+	def transfer(self, data):
+		"""Full-duplex SPI read and write.  The specified array of bytes will be
+		clocked out the MOSI line, while simultaneously bytes will be read from
+		the MISO line.  Read bytes will be returned as a bytearray object.
+		"""
+		return bytearray(self._device.xfer2(data))
+
+
+class BitBang(object):
+	"""Software-based implementation of the SPI protocol over GPIO pins."""
+
+	def __init__(self, gpio, sclk, mosi, miso, ss):
+		"""Initialize bit bang (or software) based SPI.  Must provide a BaseGPIO
+		class, the SPI clock, and optionally MOSI, MISO, and SS (slave select)
+		pin numbers. If MOSI is set to None then writes will be disabled and fail
+		with an error, likewise for MISO reads will be disabled.  If SS is set to
+		None then SS will not be asserted high/low by the library when 
+		transfering data.
+		"""
+		self._gpio = gpio
+		self._sclk = sclk
+		self._mosi = mosi
+		self._miso = miso
+		self._ss = ss
+		# Set pins as outputs/inputs.
+		gpio.setup(sclk, GPIO.OUT)
+		if mosi is not None:
+			gpio.setup(mosi, GPIO.OUT)
+		if miso is not None:
+			gpio.setup(miso, GPIO.IN)
+		if ss is not None:
+			gpio.setup(ss, GPIO.OUT)
+			# Assert SS high to start with device communication off.
+			gpio.set_high(ss)
+		# Assume mode 0.
+		self.set_mode(0)
+		# Assume most significant bit first order.
+		self.set_bit_order(MSBFIRST)
+
+	def set_clock_hz(self, hz):
+		"""Set the speed of the SPI clock.  This is unsupported with the bit
+		bang SPI class and will be ignored.
+		"""
+		pass
+
+	def set_mode(self, mode):
+		"""Set SPI mode which controls clock polarity and phase.  Should be a 
+		numeric value 0, 1, 2, or 3.  See wikipedia page for details on meaning:
+		http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus
+		"""
+		if mode < 0 or mode > 3:
+			raise ValueError('Mode must be a value 0, 1, 2, or 3.')
+		if mode & 0x02:
+			# Clock is normally high in mode 2 and 3.
+			self._clock_base = GPIO.HIGH
+		else:
+			# Clock is normally low in mode 0 and 1.
+			self._clock_base = GPIO.LOW
+		if mode & 0x01:
+			# Read on trailing edge in mode 1 and 3.
+			self._read_leading = False
+		else:
+			# Read on leading edge in mode 0 and 2.
+			self._read_leading = True
+		# Put clock into its base state.
+		self._gpio.output(self._sclk, self._clock_base)
+
+	def set_bit_order(self, order):
+		"""Set order of bits to be read/written over serial lines.  Should be
+		either MSBFIRST for most-significant first, or LSBFIRST for
+		least-signifcant first.
+		"""
+		# Set self._mask to the bitmask which points at the appropriate bit to
+		# read or write, and appropriate left/right shift operator function for
+		# reading/writing.
+		if order == MSBFIRST:
+			self._mask = 0x80
+			self._write_shift = operator.lshift
+			self._read_shift = operator.rshift
+		elif order == LSBFIRST:
+			self._mask = 0x01
+			self._write_shift = operator.rshift
+			self._read_shift = operator.lshift
+		else:
+			raise ValueError('Order must be MSBFIRST or LSBFIRST.')
+
+	def close(self):
+		"""Close the SPI connection.  Unused in the bit bang implementation."""
+		pass
+
+	def write(self, data, assert_ss=True, deassert_ss=True):
+		"""Half-duplex SPI write.  If assert_ss is True, the SS line will be
+		asserted low, the specified bytes will be clocked out the MOSI line, and
+		if deassert_ss is True the SS line be put back high.
+		"""
+		# Fail MOSI is not specified.
+		if self._mosi is None:
+			raise RuntimeError('Write attempted with no MOSI pin specified.')
+		if assert_ss and self._ss is not None:
+			self._gpio.set_low(self._ss)
+		for byte in data:
+			for i in range(8):
+				# Write bit to MOSI.
+				if self._write_shift(byte, i) & self._mask:
+					self._gpio.set_high(self._mosi)
+				else:
+					self._gpio.set_low(self._mosi)
+				# Flip clock off base.
+				self._gpio.output(self._sclk, not self._clock_base)
+				# Return clock to base.
+				self._gpio.output(self._sclk, self._clock_base)
+		if deassert_ss and self._ss is not None:
+			self._gpio.set_high(self._ss)
+
+	def read(self, length, assert_ss=True, deassert_ss=True):
+		"""Half-duplex SPI read.  If assert_ss is true, the SS line will be
+		asserted low, the specified length of bytes will be clocked in the MISO 
+		line, and if deassert_ss is true the SS line will be put back high.
+		Bytes which are read will be returned as a bytearray object.
+		"""
+		if self._mosi is None:
+			raise RuntimeError('Read attempted with no MISO pin specified.')
+		if assert_ss and self._ss is not None:
+			self._gpio.set_low(self._ss)
+		result = bytearray(length)
+		for i in range(length):
+			for j in range(8):
+				# Flip clock off base.
+				self._gpio.output(self._sclk, not self._clock_base)
+				# Handle read on leading edge of clock.
+				if self._read_leading:
+					if self._gpio.is_high(self._miso):
+						# Set bit to 1 at appropriate location.
+						result[i] |= self._read_shift(self._mask, j)
+					else:
+						# Set bit to 0 at appropriate location. 
+						result[i] &= ~self._read_shift(self._mask, j)
+				# Return clock to base.
+				self._gpio.output(self._sclk, self._clock_base)
+				# Handle read on trailing edge of clock.
+				if not self._read_leading:
+					if self._gpio.is_high(self._miso):
+						# Set bit to 1 at appropriate location.
+						result[i] |= self._read_shift(self._mask, j)
+					else:
+						# Set bit to 0 at appropriate location. 
+						result[i] &= ~self._read_shift(self._mask, j)
+		if deassert_ss and self._ss is not None:
+			self._gpio.set_high(self._ss)
+		return result
+
+	def transfer(self, data, assert_ss=True, deassert_ss=True):
+		"""Full-duplex SPI read and write.  If assert_ss is true, the SS line
+		will be asserted low, the specified bytes will be clocked out the MOSI
+		line while bytes will also be read from the MISO line, and if 
+		deassert_ss is true the SS line will be put back high.  Bytes which are
+		read will be returned as a bytearray object.
+		"""
+		if self._mosi is None:
+			raise RuntimeError('Write attempted with no MOSI pin specified.')
+		if self._mosi is None:
+			raise RuntimeError('Read attempted with no MISO pin specified.')
+		if assert_ss and self._ss is not None:
+			self._gpio.set_low(self._ss)
+		result = bytearray(len(data))
+		for i in range(len(data)):
+			for j in range(8):
+				# Write bit to MOSI.
+				if self._write_shift(data[i], j) & self._mask:
+					self._gpio.set_high(self._mosi)
+				else:
+					self._gpio.set_low(self._mosi)
+				# Flip clock off base.
+				self._gpio.output(self._sclk, not self._clock_base)
+				# Handle read on leading edge of clock.
+				if self._read_leading:
+					if self._gpio.is_high(self._miso):
+						# Set bit to 1 at appropriate location.
+						result[i] |= self._read_shift(self._mask, j)
+					else:
+						# Set bit to 0 at appropriate location. 
+						result[i] &= ~self._read_shift(self._mask, j)
+				# Return clock to base.
+				self._gpio.output(self._sclk, self._clock_base)
+				# Handle read on trailing edge of clock.
+				if not self._read_leading:
+					if self._gpio.is_high(self._miso):
+						# Set bit to 1 at appropriate location.
+						result[i] |= self._read_shift(self._mask, j)
+					else:
+						# Set bit to 0 at appropriate location. 
+						result[i] &= ~self._read_shift(self._mask, j)
+		if deassert_ss and self._ss is not None:
+			self._gpio.set_high(self._ss)
+		return result

Adafruit_GPIO/__init__.py

@@ -0,0 +1 @@
+from GPIO import *

ez_setup.py

@@ -0,0 +1,332 @@
+#!/usr/bin/env python
+"""Bootstrap setuptools installation
+
+To use setuptools in your package's setup.py, include this
+file in the same directory and add this to the top of your setup.py::
+
+    from ez_setup import use_setuptools
+    use_setuptools()
+
+To require a specific version of setuptools, set a download
+mirror, or use an alternate download directory, simply supply
+the appropriate options to ``use_setuptools()``.
+
+This file can also be run as a script to install or upgrade setuptools.
+"""
+import os
+import shutil
+import sys
+import tempfile
+import zipfile
+import optparse
+import subprocess
+import platform
+import textwrap
+import contextlib
+
+from distutils import log
+
+try:
+    from site import USER_SITE
+except ImportError:
+    USER_SITE = None
+
+DEFAULT_VERSION = "3.5.1"
+DEFAULT_URL = "https://pypi.python.org/packages/source/s/setuptools/"
+
+def _python_cmd(*args):
+    """
+    Return True if the command succeeded.
+    """
+    args = (sys.executable,) + args
+    return subprocess.call(args) == 0
+
+
+def _install(archive_filename, install_args=()):
+    with archive_context(archive_filename):
+        # installing
+        log.warn('Installing Setuptools')
+        if not _python_cmd('setup.py', 'install', *install_args):
+            log.warn('Something went wrong during the installation.')
+            log.warn('See the error message above.')
+            # exitcode will be 2
+            return 2
+
+
+def _build_egg(egg, archive_filename, to_dir):
+    with archive_context(archive_filename):
+        # building an egg
+        log.warn('Building a Setuptools egg in %s', to_dir)
+        _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir)
+    # returning the result
+    log.warn(egg)
+    if not os.path.exists(egg):
+        raise IOError('Could not build the egg.')
+
+
+def get_zip_class():
+    """
+    Supplement ZipFile class to support context manager for Python 2.6
+    """
+    class ContextualZipFile(zipfile.ZipFile):
+        def __enter__(self):
+            return self
+        def __exit__(self, type, value, traceback):
+            self.close
+    return zipfile.ZipFile if hasattr(zipfile.ZipFile, '__exit__') else \
+        ContextualZipFile
+
+
+@contextlib.contextmanager
+def archive_context(filename):
+    # extracting the archive
+    tmpdir = tempfile.mkdtemp()
+    log.warn('Extracting in %s', tmpdir)
+    old_wd = os.getcwd()
+    try:
+        os.chdir(tmpdir)
+        with get_zip_class()(filename) as archive:
+            archive.extractall()
+
+        # going in the directory
+        subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0])
+        os.chdir(subdir)
+        log.warn('Now working in %s', subdir)
+        yield
+
+    finally:
+        os.chdir(old_wd)
+        shutil.rmtree(tmpdir)
+
+
+def _do_download(version, download_base, to_dir, download_delay):
+    egg = os.path.join(to_dir, 'setuptools-%s-py%d.%d.egg'
+                       % (version, sys.version_info[0], sys.version_info[1]))
+    if not os.path.exists(egg):
+        archive = download_setuptools(version, download_base,
+                                      to_dir, download_delay)
+        _build_egg(egg, archive, to_dir)
+    sys.path.insert(0, egg)
+
+    # Remove previously-imported pkg_resources if present (see
+    # https://bitbucket.org/pypa/setuptools/pull-request/7/ for details).
+    if 'pkg_resources' in sys.modules:
+        del sys.modules['pkg_resources']
+
+    import setuptools
+    setuptools.bootstrap_install_from = egg
+
+
+def use_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL,
+        to_dir=os.curdir, download_delay=15):
+    to_dir = os.path.abspath(to_dir)
+    rep_modules = 'pkg_resources', 'setuptools'
+    imported = set(sys.modules).intersection(rep_modules)
+    try:
+        import pkg_resources
+    except ImportError:
+        return _do_download(version, download_base, to_dir, download_delay)
+    try:
+        pkg_resources.require("setuptools>=" + version)
+        return
+    except pkg_resources.DistributionNotFound:
+        return _do_download(version, download_base, to_dir, download_delay)
+    except pkg_resources.VersionConflict as VC_err:
+        if imported:
+            msg = textwrap.dedent("""
+                The required version of setuptools (>={version}) is not available,
+                and can't be installed while this script is running. Please
+                install a more recent version first, using
+                'easy_install -U setuptools'.
+
+                (Currently using {VC_err.args[0]!r})
+                """).format(VC_err=VC_err, version=version)
+            sys.stderr.write(msg)
+            sys.exit(2)
+
+        # otherwise, reload ok
+        del pkg_resources, sys.modules['pkg_resources']
+        return _do_download(version, download_base, to_dir, download_delay)
+
+def _clean_check(cmd, target):
+    """
+    Run the command to download target. If the command fails, clean up before
+    re-raising the error.
+    """
+    try:
+        subprocess.check_call(cmd)
+    except subprocess.CalledProcessError:
+        if os.access(target, os.F_OK):
+            os.unlink(target)
+        raise
+
+def download_file_powershell(url, target):
+    """
+    Download the file at url to target using Powershell (which will validate
+    trust). Raise an exception if the command cannot complete.
+    """
+    target = os.path.abspath(target)
+    cmd = [
+        'powershell',
+        '-Command',
+        "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" % vars(),
+    ]
+    _clean_check(cmd, target)
+
+def has_powershell():
+    if platform.system() != 'Windows':
+        return False
+    cmd = ['powershell', '-Command', 'echo test']
+    devnull = open(os.path.devnull, 'wb')
+    try:
+        try:
+            subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
+        except Exception:
+            return False
+    finally:
+        devnull.close()
+    return True
+
+download_file_powershell.viable = has_powershell
+
+def download_file_curl(url, target):
+    cmd = ['curl', url, '--silent', '--output', target]
+    _clean_check(cmd, target)
+
+def has_curl():
+    cmd = ['curl', '--version']
+    devnull = open(os.path.devnull, 'wb')
+    try:
+        try:
+            subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
+        except Exception:
+            return False
+    finally:
+        devnull.close()
+    return True
+
+download_file_curl.viable = has_curl
+
+def download_file_wget(url, target):
+    cmd = ['wget', url, '--quiet', '--output-document', target]
+    _clean_check(cmd, target)
+
+def has_wget():
+    cmd = ['wget', '--version']
+    devnull = open(os.path.devnull, 'wb')
+    try:
+        try:
+            subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
+        except Exception:
+            return False
+    finally:
+        devnull.close()
+    return True
+
+download_file_wget.viable = has_wget
+
+def download_file_insecure(url, target):
+    """
+    Use Python to download the file, even though it cannot authenticate the
+    connection.
+    """
+    try:
+        from urllib.request import urlopen
+    except ImportError:
+        from urllib2 import urlopen
+    src = dst = None
+    try:
+        src = urlopen(url)
+        # Read/write all in one block, so we don't create a corrupt file
+        # if the download is interrupted.
+        data = src.read()
+        dst = open(target, "wb")
+        dst.write(data)
+    finally:
+        if src:
+            src.close()
+        if dst:
+            dst.close()
+
+download_file_insecure.viable = lambda: True
+
+def get_best_downloader():
+    downloaders = [
+        download_file_powershell,
+        download_file_curl,
+        download_file_wget,
+        download_file_insecure,
+    ]
+
+    for dl in downloaders:
+        if dl.viable():
+            return dl
+
+def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL,
+        to_dir=os.curdir, delay=15, downloader_factory=get_best_downloader):
+    """
+    Download setuptools from a specified location and return its filename
+
+    `version` should be a valid setuptools version number that is available
+    as an egg for download under the `download_base` URL (which should end
+    with a '/'). `to_dir` is the directory where the egg will be downloaded.
+    `delay` is the number of seconds to pause before an actual download
+    attempt.
+
+    ``downloader_factory`` should be a function taking no arguments and
+    returning a function for downloading a URL to a target.
+    """
+    # making sure we use the absolute path
+    to_dir = os.path.abspath(to_dir)
+    zip_name = "setuptools-%s.zip" % version
+    url = download_base + zip_name
+    saveto = os.path.join(to_dir, zip_name)
+    if not os.path.exists(saveto):  # Avoid repeated downloads
+        log.warn("Downloading %s", url)
+        downloader = downloader_factory()
+        downloader(url, saveto)
+    return os.path.realpath(saveto)
+
+def _build_install_args(options):
+    """
+    Build the arguments to 'python setup.py install' on the setuptools package
+    """
+    return ['--user'] if options.user_install else []
+
+def _parse_args():
+    """
+    Parse the command line for options
+    """
+    parser = optparse.OptionParser()
+    parser.add_option(
+        '--user', dest='user_install', action='store_true', default=False,
+        help='install in user site package (requires Python 2.6 or later)')
+    parser.add_option(
+        '--download-base', dest='download_base', metavar="URL",
+        default=DEFAULT_URL,
+        help='alternative URL from where to download the setuptools package')
+    parser.add_option(
+        '--insecure', dest='downloader_factory', action='store_const',
+        const=lambda: download_file_insecure, default=get_best_downloader,
+        help='Use internal, non-validating downloader'
+    )
+    parser.add_option(
+        '--version', help="Specify which version to download",
+        default=DEFAULT_VERSION,
+    )
+    options, args = parser.parse_args()
+    # positional arguments are ignored
+    return options
+
+def main():
+    """Install or upgrade setuptools and EasyInstall"""
+    options = _parse_args()
+    archive = download_setuptools(
+        version=options.version,
+        download_base=options.download_base,
+        downloader_factory=options.downloader_factory,
+    )
+    return _install(archive, _build_install_args(options))
+
+if __name__ == '__main__':
+    sys.exit(main())

setup.py

@@ -0,0 +1,13 @@
+from ez_setup import use_setuptools
+use_setuptools()
+from setuptools import setup, find_packages
+
+setup(name 				= 'Adafruit_GPIO',
+	  version 			= '0.1.0',
+	  author			= 'Tony DiCola',
+	  author_email		= 'tdicola@adafruit.com',
+	  description		= 'Library to provide a cross-platform GPIO interface on the Raspberry Pi and Beaglebone Black using the RPi.GPIO and Adafruit_BBIO libraries.',
+	  license			= 'MIT',
+	  url				= 'https://github.com/adafruit/Adafruit_Python_GPIO/',
+	  install_requires	= ['spidev'],
+	  packages 			= find_packages())

test/MockGPIO.py

@@ -0,0 +1,40 @@
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import Adafruit_GPIO as GPIO
+
+
+class MockGPIO(GPIO.BaseGPIO):
+	def __init__(self):
+		self.pin_mode = {}
+		self.pin_written = {}
+		self.pin_read = {}
+
+	def setup(self, pin, mode):
+		self.pin_mode[pin] = mode
+
+	def output(self, pin, bit):
+		self.pin_written.setdefault(pin, []).append(1 if bit else 0)
+
+	def input(self, pin):
+		if pin not in self.pin_read:
+			raise RuntimeError('No mock GPIO data to read for pin {0}'.format(pin))
+		return self.pin_read[pin].pop(0) == 1

test/test_GPIO.py

@@ -0,0 +1,123 @@
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import unittest
+
+from mock import Mock, patch
+
+import Adafruit_GPIO as GPIO
+import Adafruit_GPIO.SPI as SPI
+
+from MockGPIO import MockGPIO
+
+
+class TestBaseGPIO(unittest.TestCase):
+	def test_set_high_and_set_low(self):
+		gpio = MockGPIO()
+		gpio.set_high(1)
+		gpio.set_low(1)
+		self.assertDictEqual(gpio.pin_written, {1: [1, 0]})
+
+	def test_is_high_and_is_low(self):
+		gpio = MockGPIO()
+		gpio.pin_read[1] = [0, 0, 1, 1]
+		self.assertTrue(gpio.is_low(1))
+		self.assertFalse(gpio.is_high(1))
+		self.assertFalse(gpio.is_low(1))
+		self.assertTrue(gpio.is_high(1))
+
+
+class TestRPiGPIOAdapter(unittest.TestCase):
+	def test_setup(self):
+		rpi_gpio = Mock()
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio)
+		adapter.setup(1, GPIO.OUT)
+		rpi_gpio.setup.assert_called_with(1, rpi_gpio.OUT)
+		adapter.setup(1, GPIO.IN)
+		rpi_gpio.setup.assert_called_with(1, rpi_gpio.IN)
+
+	def test_output(self):
+		rpi_gpio = Mock()
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio)
+		adapter.output(1, True)
+		rpi_gpio.output.assert_called_with(1, True)
+		adapter.output(1, False)
+		rpi_gpio.output.assert_called_with(1, False)
+
+	def test_input(self):
+		rpi_gpio = Mock()
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio)
+		rpi_gpio.input = Mock(return_value=True)
+		val = adapter.input(1)
+		self.assertTrue(val)
+		rpi_gpio.input.assert_called_with(1)
+
+	def test_setmode(self):
+		rpi_gpio = Mock()
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio, mode=rpi_gpio.BCM)
+		rpi_gpio.setmode.assert_called_with(rpi_gpio.BCM)
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio, mode=rpi_gpio.BOARD)
+		rpi_gpio.setmode.assert_called_with(rpi_gpio.BOARD)
+		adapter = GPIO.RPiGPIOAdapter(rpi_gpio)
+		rpi_gpio.setmode.assert_called_with(rpi_gpio.BCM)
+
+
+class TestAdafruitBBIOAdapter(unittest.TestCase):
+	def test_setup(self):
+		bbio_gpio = Mock()
+		adapter = GPIO.AdafruitBBIOAdapter(bbio_gpio)
+		adapter.setup(1, GPIO.OUT)
+		bbio_gpio.setup.assert_called_with(1, bbio_gpio.OUT)
+		adapter.setup(1, GPIO.IN)
+		bbio_gpio.setup.assert_called_with(1, bbio_gpio.IN)
+
+	def test_output(self):
+		bbio_gpio = Mock()
+		adapter = GPIO.AdafruitBBIOAdapter(bbio_gpio)
+		adapter.output(1, True)
+		bbio_gpio.output.assert_called_with(1, True)
+		adapter.output(1, False)
+		bbio_gpio.output.assert_called_with(1, False)
+
+	def test_input(self):
+		bbio_gpio = Mock()
+		adapter = GPIO.AdafruitBBIOAdapter(bbio_gpio)
+		bbio_gpio.input = Mock(return_value=True)
+		val = adapter.input(1)
+		self.assertTrue(val)
+		bbio_gpio.input.assert_called_with(1)
+
+
+class TestGetPlatformGPIO(unittest.TestCase):
+	def test_raspberrypi(self):
+		rpi = Mock()
+		with patch.dict('sys.modules', {'RPi': rpi, 'RPi.GPIO': rpi.gpio}):
+			gpio = GPIO.get_platform_gpio(plat='Linux-3.10.25+-armv6l-with-debian-7.4')
+			self.assertIsInstance(gpio, GPIO.RPiGPIOAdapter)
+
+	def test_beagleboneblack(self):
+		bbio = Mock()
+		with patch.dict('sys.modules', {'Adafruit_BBIO': bbio, 'Adafruit_BBIO.GPIO': bbio.gpio}):
+			gpio = GPIO.get_platform_gpio(plat='Linux-3.8.13-bone47-armv7l-with-debian-7.4')
+			self.assertIsInstance(gpio, GPIO.AdafruitBBIOAdapter)
+
+	def test_otherplatform(self):
+		self.assertRaises(RuntimeError, GPIO.get_platform_gpio, plat='foo-bar')

test/test_SPI.py

@@ -0,0 +1,192 @@
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import unittest
+
+import Adafruit_GPIO as GPIO
+import Adafruit_GPIO.SPI as SPI
+
+from MockGPIO import MockGPIO
+
+
+class TestBitBangSPI(unittest.TestCase):
+	def test_pin_modes_set_correctly(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		self.assertDictEqual(gpio.pin_mode, { 1: GPIO.OUT, 
+											  2: GPIO.OUT,
+											  3: GPIO.IN,
+											  4: GPIO.OUT })
+
+	def test_ss_set_high_after_initialization(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		self.assertListEqual(gpio.pin_written[4], [1])
+
+	def test_mode_0_write(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		device.write([0x1F])
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1])
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+
+	def test_write_assert_deassert_ss_false(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		device.write([0x1F], assert_ss=False, deassert_ss=False)
+		self.assertListEqual(gpio.pin_written[4], [1])
+
+	def test_write_lsbfirst(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		device.set_bit_order(SPI.LSBFIRST)
+		device.write([0x1F])
+		self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
+
+	def test_invalid_mode_fails(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		self.assertRaises(ValueError, device.set_mode, -1)
+		self.assertRaises(ValueError, device.set_mode, 4)
+
+	def test_invalid_bit_order_fails(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		self.assertRaises(ValueError, device.set_bit_order, -1)
+		self.assertRaises(ValueError, device.set_bit_order, 2)
+
+	def test_mode_0_read(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+		result = device.read(1)
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertNotIn(2, gpio.pin_written)
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+		# Verify result
+		self.assertEqual(result, bytearray([0x1F]))
+
+	def test_read_assert_deassert_ss_false(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+		result = device.read(1, assert_ss=False, deassert_ss=False)
+		self.assertListEqual(gpio.pin_written[4], [1])
+
+	def test_read_multiple_bytes(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
+						    0, 0, 0, 1, 1, 1, 1, 1]
+		result = device.read(3)
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1,
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertNotIn(2, gpio.pin_written)
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+		# Verify result
+		self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
+
+	def test_write_multiple_bytes(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		device.write([0x1F, 0xF8, 0x1F])
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1,
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertListEqual(gpio.pin_written[2], [0, 0, 0, 1, 1, 1, 1, 1,
+												   1, 1, 1, 1, 1, 0, 0, 0,
+												   0, 0, 0, 1, 1, 1, 1, 1])
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+
+	def test_mode_0_transfer(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1]
+		result = device.transfer([0xF8])
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0])
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+		# Verify result
+		self.assertEqual(result, bytearray([0x1F]))
+
+	def test_transfer_multiple_bytes(self):
+		gpio = MockGPIO()
+		device = SPI.BitBang(gpio, 1, 2, 3, 4)
+		gpio.pin_read[3] = [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
+							0, 0, 0, 1, 1, 1, 1, 1]
+		result = device.transfer([0xF8, 0x1F, 0xF8])
+		# Verify clock
+		self.assertListEqual(gpio.pin_written[1], [0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1,
+												   0, 1, 0, 1, 0, 1, 0, 1, 
+												   0, 1, 0, 1, 0, 1, 0, 1, 0])
+		# Verify MOSI
+		self.assertListEqual(gpio.pin_written[2], [1, 1, 1, 1, 1, 0, 0, 0,
+												   0, 0, 0, 1, 1, 1, 1, 1,
+												   1, 1, 1, 1, 1, 0, 0, 0])
+		# Verify MISO
+		self.assertNotIn(3, gpio.pin_written)
+		# Verify SS
+		self.assertListEqual(gpio.pin_written[4], [1, 0, 1])
+		# Verify result
+		self.assertEqual(result, bytearray([0x1F, 0xF8, 0x1F]))
+
+	#TODO: Test mode 1, 2, 3
+
+	#TODO: Test null MOSI, MISO, SS