Dmx interface for raspberry pi
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)
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.
On raspbian installin OLA is easy: apt-get install ola should do the trick.
There are some important hints at: http://opendmx.net/index.php/OLA_Device_Specific_Configuration#UART_native_DMX
Most importantly: add:
to your config.txt file in the /boot directory.
Next, you need to co9nfigure 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!