#Linux driver for a 32x32 RGB led panel
Bit banging driver to manage a RGB led panel using the Arieta G25 Linux Embedded SoM
##Installation
Move inside the linux/drivers Linux source directory and clone the ledpanel git repository:
$ git clone git://github.com/tanzilli/ledpanel.git
add the following line in linux/driver/Makefile:
obj-$(CONFIG_LEDPANEL) += ledpanel/
add the following line in__linux/driver/Kconfig__:
source "drivers/ledpanel/Kconfig"
Run make menuconfig and enable the ledpanel driver:
Device Drivers --->
<*> RGB led panel bit banging driver (NEW)
and the High Resolution Timer Support:
General setup --->
Timers subsystem --->
[*] High Resolution Timer Support
##Using ledpanel driver from user space
Create a nx32x32*3 image byte array (24 bit for any pixel) (where "n" is the number of modules in a panel) and save in on /sys/class/ledpanel/rgb_buffer or just type (n=1):
dd if=/dev/urandom of=/sys/class/ledpanel/rgb_buffer bs=3072 count=1
to show a random pattern.
More examples are available on:
##Multi module upgrade
Multi module panels are now supported. As there is no known way to detect from I/O pins how many modules are attached to the panel, the exact number of modules has to be statically specified at module load time
insmod ledpanel.ko nmodule=3
Moreover, the resolution can be dynamically read by the application program via a couple of attributes that have been purposedly added to the driver
cat /sys/module/ledpanel/parameters/height
32
cat /sys/module/ledpanel/parameters/width
96
All utilities in contained in led-utils repository have been updated to comply with this new model, reading at startup the real led panel size. See the specific github repository.
#Where to buy:
#Licence terms
Copyright (C) 2015 Sergio Tanzilli, All Rights Reserved. sergio@tanzilli.com http://www.acmesystems.it/ledpanel
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.