A Python library for controlling the hardware attached to the Raspberry Pi's header pins, without running as the root user.
Earlier versions of the I2C API do not work if you upgrade the kernel of the official Raspbian distribution to Linux 3.6 by running rpi-update. You will see an error like:
File "/home/pi/quick2wire-python-api/src/quick2wire/i2c.py", line 74, in transaction
ioctl(self.fd, I2C_RDWR, addressof(ioctl_arg))
OverflowError: Python int too large to convert to C long
Please pull the latest changes if you have this issue. The I2C API now works on Raspbian with the 3.6 kernel and the 3.2 kernel that's shipped with the official Raspbian distribution. Note that we've recently reorganised the API repo slightly to conform with Python conventions. The root of the repository should now be added to PYTHONPATH. If you run python3 from within the root directory of th repository, you can import quick2wire modules without having to fiddle with the PYTHONPATH at all.
The library depends on Python 3. To install Python 3 run this command from an administrator account, such as pi:
sudo apt-get install python3
You'll also find the python tools virtualenv and pip useful:
sudo apt-get install python-pip
sudo apt-get install python-virtualenv
The GPIO API depends on Quick2Wire GPIO Admin. To install Quick2Wire GPIO Admin, follow the instructions at http://github.com/quick2wire/quick2wire-gpio-admin
The I2C and SPI API depend on support in the kernel. Recent raspbian kernels should be fine.
The library is currently under active development, so we do not
recommend installing it into the system-wide Python libraries.
Instead, you can either use it without installation or install it into
an isolated Python development environment created with
virtualenv.
To use the library without installation, add the full path of the
source tree to the PYTHONPATH environment variable. For example:
export QUICK2WIRE_API_HOME=[the directory cloned from Git or unpacked from the source archive]
export PYTHONPATH=$PYTHONPATH:$QUICK2WIRE_API_HOME
If you're using virtualenv, make your virtualenv active, and then run:
python3 setup.py install
There is a discussion group in which you can ask questions about the library.
If you have discovered a bug or would like to request a feature, raise an issue in the issue tracker.