i²c on Raspberry Pi for Raku
# Obviously you will need to actually read the data sheet of your device.
my RPi::Device::SMBus $smbus = RPi::Device::SMBus.new(device => '/dev/i2c-1', address => 0x54);
This is an SMBus/i²c interface that has been written and tested for
the Raspberry Pi, however it uses a fairly generic POSIX interface so if
your platform exposes the i²c interface as a character special device
it may work.
In order to use this you will need to install and configure the i2c-dev
kernel module and tools. On a default Debian image you should be able
to just do:
sudo apt-get install libi2c-dev i2c-tools
And then edit the
/etc/modules to add the modules by adding:
Or for a Raspberry Pi 3
And then rebooting.
If you have a more recent raspbian you may alternatively be able to use
raspi-config where you can turn on
i2c under "Interfacing Options".
Typicaly the i2c device will be
/dev/i2c-1 on a Raspberry Pi rev
B. or v2 or
/dev/i2c-0 on older versions.
You can determine the bus address of your device by doing:
sudo i2cdetect -y 1 # replace the 1 with a 0 for older versions
(Obviously the device should be connected, consult the manual for your
device about this.)
Which should give you the hexadecimal address of your device. Some
devices may not respond, so you may want to either check the data sheet
of your device or read the
i2cdetect manual page to get other options.
It should be noted that because there is no easy way of testing this without
using physical devices then it may not work perfectly in all cases, but I'd
be delighted to receive patches for any issues found.
Assuming you have a working Rakudo installation you should be able to install this with zef :
# From the source directory
zef install .
# Remote installation
zef install RPi::Device::SMBus
The tests are likely to completely fail on anything but a Raspberry Pi with the i²c configured as above.
Suggestions/patches are welcomed via github
This is free software.
Please see the LICENCE file in the distribution
© Jonathan Stowe 2015 - 2021