Initial commit of version 0.1.0

diff --git a/.gitignore b/.gitignore
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+__pycache__/
+venv/

diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+Copyright (c) 2020 Graph-IT GmbH
+
+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.

diff --git a/README.md b/README.md
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+# Raspberry Pi PCF8574 I/O Card Test
+
+This package contains a script to test I/O cards with a PCF8574(A) chip on
+a raspberry pi.
+
+A more detailed documentation can be found in [doc/index.md](doc/index.md),
+which can also be found at [http://docs.graph-it.com/graphit/pin-py](http://docs.graph-it.com/graphit/pin-py).

diff --git a/doc/index.md b/doc/index.md
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+# Raspberry Pi PCF8574 I/O Card Test
+
+This package contains a script to test I/O cards with a PCF8574(A) chip on
+a raspberry pi.
+
+## Installation
+
+The package can be installed with `pip` directly from our git repository:
+```sh
+$ pip install git+git://git.graph-it.com/graphit/iocardtest-py.git
+```
+
+## Usage
+
+TODO

diff --git a/iocardtest.py b/iocardtest.py
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+import pigpio
+import asyncio
+import signal
+from graphit.pin.gpio import GPIOInputPin
+from graphit.pin.pcf8574 import PCF8574Input, PCF8574Output
+
+delay = 0.1
+
+
+async def board_test(loop: asyncio.events.AbstractEventLoop, pi: pigpio.pi,
+                     direction: str, output_address: int,
+                     input_address: int, input_pin: int):
+    success = True
+    try:
+        output_board = PCF8574Output(pi, output_address)
+    except pigpio.error as err:
+        print(f"{direction} board test: output board not found ({err})")
+        return
+    try:
+        input_board = PCF8574Input(pi, input_address,
+                                   GPIOInputPin(loop, pi, input_pin, up=True))
+    except pigpio.error as err:
+        print(f"{direction} board test: input board not found ({err})")
+        output_board.close()
+        return
+    output_board.setValues(0)
+    for pin in range(8):
+        output_board.setValue(pin, True)
+        await asyncio.sleep(delay)
+        if not input_board.getValue(pin):
+            input_board._fetchValues()
+            output_values = output_board.getValues()
+            input_values = input_board.getValues()
+            if not input_board.getValue(pin):
+                print(f"{direction} pin {pin} on failed "
+                      f"(out: {output_values}, in: {input_values})")
+            else:
+                print(f"{direction} pin {pin} on did not send interrupt "
+                      f"(out: {output_values}, in: {input_values})")
+            success = False
+    output_board.setValues(255)
+    for pin in range(8):
+        output_board.setValue(pin, False)
+        await asyncio.sleep(delay)
+        if input_board.getValue(pin):
+            input_board._fetchValues()
+            output_values = output_board.getValues()
+            input_values = input_board.getValues()
+            if input_board.getValue(pin):
+                print(f"{direction} pin {pin} off failed "
+                      f"(out: {output_values}, in: {input_values})")
+            else:
+                print(f"{direction} pin {pin} off did not send interrupt "
+                      f"(out: {output_values}, in: {input_values})")
+            success = False
+    if success:
+        print(f"{direction} board test succeeded")
+        output_board.setValues(255)
+    else:
+        print(f"{direction} board test failed")
+        output_board.setValues(0)
+    await asyncio.sleep(delay)
+    output_board.close()
+    input_board.close()
+
+
+async def setup(loop: asyncio.events.AbstractEventLoop, pi: pigpio.pi):
+    loop.add_signal_handler(signal.SIGTERM, lambda: loop.stop())
+
+    def _green(value):
+        if value:
+            loop.create_task(board_test(loop, pi, "Input", 57, 32, 17))
+    GPIOInputPin(loop, pi, 27).on('change', _green)
+
+    def _red(value):
+        if value:
+            loop.create_task(board_test(loop, pi, "Output", 56, 33, 4))
+    GPIOInputPin(loop, pi, 22).on('change', _red)
+
+
+if __name__ == '__main__':
+    pi = pigpio.pi()
+    loop = asyncio.get_event_loop()
+    loop.create_task(setup(loop, pi))
+    try:
+        loop.run_forever()
+    except KeyboardInterrupt:
+        pass
+    finally:
+        print("Exiting")
+        loop.close()

diff --git a/iocardtest.service b/iocardtest.service
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+++ b/iocardtest.service
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+[Unit]
+Description=I/O card testing
+Requires=pigpiod.service
+After=pigpiod.service
+
+[Service]
+User=pi
+Environment=PYTHONUNBUFFERED=1
+ExecStart=/home/pi/iocardtest/bin/python3 /home/pi/iocardtest/bin/iocardtest.py
+
+[Install]
+WantedBy=multi-user.target

diff --git a/setup.py b/setup.py
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+++ b/setup.py
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+import setuptools
+
+with open("README.md", "r") as readme_file:
+    long_description = readme_file.read()
+
+setuptools.setup(
+    name="graphit-pin",
+    version="0.1.0",
+    author="Graph-IT GmbH",
+    author_email="info@graph-it.com",
+    description="Raspberry Pi PCF8574 I/O Card Test",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+    url="http://docs.graph-it.com/graphit/iocardtest-py",
+    packages=setuptools.find_packages(),
+    scripts=[
+        "iocardtest.py",
+        "iocardtest.service",
+    ],
+    setup_requires=[
+        "wheel",
+    ],
+    install_requires=[
+        "pigpio",
+        "graphit-pin @ git+git://git.graph-it.com/graphit/pin-py.git",
+    ],
+    classifiers=[
+        "Programming Language :: Python",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
+    ],
+)