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SETUP.md

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Hardware Configuration

  • Start with a blank Raspberry Pi running Raspian "2012-12-16-wheezy-raspbian" or later

  • Connect a Stronglink SL030 to the i2c bus, and the SL030 'OUT' to hardware pin 11 on the Raspberry Pi header

  • You may need to compile the Raspberry Pi kernel as per Ben Green's i2c Raspberry Pi kernel patch but this appears to be unnecessary on later versions of Raspbian

System Setup

Enable the required kernel modules. See this SK Pang blog entry for more details

sudo -s
echo i2c-dev >> /etc/modules
echo blacklist spi-bcm2708 >> /etc/modprobe.d/raspi-blacklist.conf
# Note that you will need to reboot after this step

Install required packages/libraries

sudo aptitude install python-pip python-virtualenv git

For debugging

sudo aptitude install i2c-tools

GPIO-ADMIN

Install gpio-admin - see the gpio-admin github page for more information. Unfortunately the quick2wire code occasionally stops being backwards compatible, so I check-out a specific version of the code. If you encounter bugs, you may wish to do a 'git checkout master' instead of 'git checkout tags/1.1.10' here.

cd ~
git clone git://github.com/quick2wire/quick2wire-gpio-admin.git
cd quick2wire-gpio-admin
git checkout tags/1.1.0
make
sudo make install
sudo adduser pi gpio

QUICK2WIRE LIBRARY

Install the Quick2Wire Python API:

See the Quick 2 Wire page for more information.

This library is unusual in that its default installation method is to reside in the ~pi home directory. Note that README.txt references this at this path through environment variables.

As with GPIO-admin above, the quick2wire code occasionally stops being backwards compatible, so I check-out a specific version of the code. If you encounter bugs, you may wish to do a 'git checkout master' instead of 'git checkout c5e21e9d804012efd9d214d18909034b4b898c96' here.

cd ~
git clone git://github.com/quick2wire/quick2wire-python-api.git
cd quick2wire-python-api
git checkout c5e21e9d804012efd9d214d18909034b4b898c96

sudo groupadd i2c
sudo adduser pi i2c

FINAL CONFIGURATION

Make directories for the carddb:

sudo mkdir -p /var/local/rpac/acls/
sudo chown -R root:root /var/local/rpac/
sudo chmod -R 755 /var/local/rpac/

Reboot, so that the kernel drivers are loaded:

sudo reboot

TROUBLESHOOTING

Error: gpio-admin: could not flush data to /sys/class/gpio/export: Device or resource busy

This message is related to a bug in the quick2wire-gpio-admin library, where if you attempt to export something that's already exported, gpio-admin crashed.

The simplest solution is to reboot. Alternatively, you can do the following, which will un-export all items. Note that this may lead to other hardware items on the box failing. A reboot may be the better option then.

sudo -s cd /sys/class/gpio

This command finds all items like 'gpio23' in the /sys/class/gpio, and then

runs a command like 'gpio-admin unexport 23'

ls -d gpio[0-9][0-9] | sed -e 's/gpio//g' | xargs -r -t -l1 -exec gpio-admin unexport exit # go back to a standard user

Card IDs may be corrupted / transposed

If The Stronglink reader returns the wrong card IDs, this may be related to timing issues with either the Raspberry Pi or the Stronglink reader. In this case, you may need to apply Ben Green's i2c Raspberry Pi kernel patch