Difference between revisions of "Dmx interface for raspberry pi"
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to your config.txt file in the /boot directory. |
to your config.txt file in the /boot directory. |
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Next, you need to |
Next, you need to configure ola to use the native-uart plugin. This is described at: http://www.raspberrypi-dmx.com/raspberry-pi-ola-dmx512-sender |
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Locate your ola-uartdmx.conf (on some systems I'm told it is in ''/etc/ola/conf/'', on others ''/var/lib/ola/conf/''). Edit it and set enabled to true, set the correct device (ttyS0 on rpi3, ttyAMA0 on |
Locate your ola-uartdmx.conf (on some systems I'm told it is in ''/etc/ola/conf/'', on others ''/var/lib/ola/conf/''). Edit it and set enabled to true, set the correct device (ttyS0 on rpi3, ttyAMA0 on |
Revision as of 18:24, 5 April 2016
Introduction
The DMX interface for raspberry pi allows you to interface a raspberry pi with DMX hardware.
There is also a version "with FT245" That version adds the option to use your raspberry pi with our board as an Enttec USB Pro compatible device from another computer (raspberry pi or PC, Windows or Linux)
software
There are several software packages that can be used with your DMX interface for Raspberry pi.
First there are QLC and OLA. These are packages that run on Linux on the raspberry pi and allow you to control a DMX Universe.
Second, there are several packages by Arjan van Vught that use the raspberry pi "bare metal".
QLC and OLA
Don't forget to remove the console and getty from the serial port that the DMX inteface is using.
See: http://elinux.org/RPi_Serial_Connection#Preventing_Linux_using_the_serial_port
QLC
todo
OLA
On raspbian jessie installing OLA is easy: apt-get install ola should do the trick. The downside is however that it doesn't work :-( .
what does work however is:
mkdir ola cd ola https://github.com/OpenLightingProject/ola/archive/0.10.1.tar.gz tar xvfz 0.10.1.tar.gz cd ola-0.10.1 autoreconf -i ./configure make -j 5 sudo make install
On Wheezy, adding
deb http://apt.openlighting.org/raspbian wheezy main
to /etc/apt/sources.list, and then the apt-get install ola should work.
There are some important hints at: http://opendmx.net/index.php/OLA_Device_Specific_Configuration#UART_native_DMX
Most importantly: add:
init_uart_clock=16000000
to your config.txt file in the /boot directory.
Next, you need to configure ola to use the native-uart plugin. This is described at: http://www.raspberrypi-dmx.com/raspberry-pi-ola-dmx512-sender
Locate your ola-uartdmx.conf (on some systems I'm told it is in /etc/ola/conf/, on others /var/lib/ola/conf/). Edit it and set enabled to true, set the correct device (ttyS0 on rpi3, ttyAMA0 on others), and add /dev/ttyAMA0-break = 100 and /dev/ttyAMA0-malf = 100 . It should then look like:
/dev/ttyAMA0-break = 100 /dev/ttyAMA0-malf = 100 device = /dev/ttyAMA0 enabled = true
Then set the board to output mode. I would recommend creating a small script (sudo nano /usr/bin/set_dmx_mode; sudo chmod 755 /usr/bin/set_dmx_mode) :
#!/bin/sh # set_dmx_mode echo 18 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio18/direction echo $1 > /sys/class/gpio/gpio18/value
then calling the script:
sudo set_dmx_mode 1
I recommend putting that line in /etc/rc.local so that it gets executed at boot time so you don't have to worry about it. (IIRC there is an "exit 0" in there, so don't put it AFTER that!)