====== berries ======                 

So you also got yourself a berry (Raspberry Pi, raspberrypi). Here you can find some recipes.

===== Useful libraries =====
 - [[http://wiringpi.com/|wiringpi]]
=====General Knowledge=====
===Getting started===
The fastest way to get going with your raspberry pi is to simply flash a suitable prebuilt [[http://downloads.raspberrypi.org/images/raspbian/2012-12-16-wheezy-raspbian/2012-12-16-wheezy-raspbian.zip|image]] to an SD card. (you need an SD card to boot though you could put everything aside the boot partition on a USB drive with additional effort)..

	sudo dd if=<path_to_img>/2012-12-16-wheezy-raspbian.img of=/dev/<your_SD_card> bs=2M
(the sd card could be mmcblk0 or sdx - make sure not to overwrite your system harddrive)

After that you're good to boot up your raspberry pi for the first time.
Make sure to expand your rootfs (so it fills your whole SD card).
Adapt the other settings to suit your needs.
Updating and ssh probably aren't the worst ideas.

After rebooting run a full upgrade (the initial user is pi, password raspberry)

	sudo apt-get update && sudo apt-get dist-upgrade

This will leave you with a usable raspbian (kernel 3.2.27).


===upgrade the firmware===
You can either type some commands found [[https://github.com/Hexxeh/rpi-update|here]]
or download this litte script (which embeds those exact commands)

	wget http://excogitation.de/projects/berry/update-my-raspberrypi-firmware.sh -O umr.sh
or even shorter (case sensitive)
	wget bit.ly/UgXdPF -O umr.sh

execute with:
	sudo sh umr.sh

-> this (at the time of writing) leaves you with kernel 3.6.11 + latest rpi firmware


===Good to know===
you can prevent your monitor from going blank

edit: /etc/lightdm/lightdm.conf  e.g. sudo nano /etc/lightdm/lightdm.conf

find:
[SeatDefault]
#xserver-command=X

change to: (remove the # at the start of the line)
xserver-command=X -s 0 dpms

====Thin Client====
===VNC===
This guide assumes there is no X already running.

Install xtightvncviewer (or use aptitude or whatever)
	sudo apt-get install xtightvncviewer


you need to somehow start an X server
	X &
or add it to /etc/rc.local
then you're good to connect to your server
	DISPLAY=:0 xtightvncviewer -fullscreen <yourserver>:port



The speed to run e.g. Windows 7 "on" your raspberry pi is pretty impressive.

===RDP===
2come

====USBIP====
The possibility to do this is due to the awesome project over at [[http://usbip.sourceforge.net/|soureforge]].
Unfortunately the driver is only in staging which means we have to build our own kernel.
On the other hand we always wanted to do that and here's how you (cross)[[berries#cross-compile_the_kernel|compile a kernel]]/modules.

For those of you who just want to start using some usb device over the network I have a precompiled kernel + matching usbip
modules here (hey, I understand - it took me 2 days to get it running for the first time
...  compiling the modules from the 3.2.27/3.6.11 git branch which then wouldn't match the kernel - fuck me)

	wget http://excogitation.de/projects/berry/usbip.tar.gz
or shorter
	wget http://bit.ly/VUPf0k -O usbip.tar.gz

Take care though - this archive assumes you already have [[berries#upgrade the firmware|upgraded the firmware]].
It will overwrite your rc.conf, kernel, modules (assuming you're on 3.6.11 - which you should be - because you already
ran the rpi-update).

No warranties and shit.

	sudo tar -xzf usbip.tar.gz -C /

Reboot. Test.
	sudo modprobe usbip-host

\^^ that should work - check with
	lsmod | grep usbip

You can autoload the module by adding it (usbip-host) to /etc/modules

Install the usbip daemon
	sudo apt-get install usbipd

It will initially share the upper usb port through usbip so if you have anything attached
like a mouse or keyboard that device will no longer work.

adapt the /etc/rc.local to your needs
	usbip bind -<your_usb_device_id> (find your usb_device_id with "usbip list -l")

find the device you want to share
	usbip list -l


===windows client===
Unfortunately there is no matching client for windows on the sourceforge page since someone [[http://sourceforge.net/projects/usbip/forums/forum/418507/topic/4581128?message=10649780|changed the defines]] only in the linux version
You can find a working version [[http://files.p1m.nl/usbip/|here]] [[https://sourceforge.net/projects/usbip/forums/forum/418507/topic/4581128/index/page/3|1]] or you can take another [[http://excogitation.de/projects/berry/usbip_win_obcd.zip|improved and adapted version]]  from [[http://www.raspberrypi.org/phpBB3/memberlist.php?mode=viewprofile&u=28131| obcd]] who I met over at [[http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=8858| raspberry pi forums]]. 

The rest will follow shortly - benchmark writing to a USB stick, ... (I wrote it down in the virtual windows machine).


====cross-compile the kernel====
  * get the toolchain
<code>$ git clone https://github.com/raspberrypi/tools.git --depth 1</code>

  *install required packages e.g.
<code># apt-get install gcc-arm-linux-gnueabi make ncurses-dev</code>

  * clone raspberry pi kernel sources
<code>git clone --depth 1 git://github.com/raspberrypi/linux.git</code>

  * generate .config file from bcmrpi-defconfig
<code>make ARCH=arm CROSS_COMPILE=<path to toolchain>(/tools)/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin/arm-bcm2708hardfp-linux-gnueabi- bcmrpi_defconfig</code>

  * add USBIP to kernel config
<code>echo -e "CONFIG_USBIP_CORE=m\nCONFIG_USBIP_VHCI_HCD=m\nCONFIG_USBIP_HOST=m\nCONFIG_USBIP_DEBUG=n" >> .config</code>

  * compiling the kernel
<code>make ARCH=arm CROSS_COMPILE=<path to toolchain>(/tools)/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin/arm-bcm2708hardfp-linux-gnueabi- -j <# of cores to use></code>

  * build the modules
<code>ARCH=arm CROSS_COMPILE=<path to toolchain>(/tools)/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin/arm-bcm2708hardfp-linux-gnueabi- make modules_install INSTALL_MOD_PATH=../modules -j <# of cores to use></code>

  * copy the stuff to the raspberry's SD card
    * linux/arch/arm/boot/zImage ->  /mnt/partion #1/kernel.img
    * modules -> /mnt/partion #2/modules
      * (modules/lib/modules/3.6.11+/kernel/drivers/staging/usbip is where your usbip modules magically appeared ;-))

===== Projects @shack =====

====Lazor====
At the moment we need a Windows OS to control our [[infrastruktur:fablab:lasercutter]] because there's only control software available for Windows. Since dealing with that machine is a delicate matter - we haven't looked at/tried to reverse the control commands ... yet.

It is possible to use a raspberry pie to control the laser by
	- setting it up as a [[berries#vnc|thin client]] connected to a virtual machine running some Windows os.
	- forwarding the lasercutter (connected to the raspis USB port) to to that virtual machine using [[berries#usbip|usb over ip]]

That way you also have a central place to manage a database with cutting settings and to update the laser software.
Also the workflow should become easier and maybe also add usage statistics somewhen in the future.

====One Button====
see [[project:one_button|One Button]]

{{https://lh6.googleusercontent.com/-KhBmkpEr_QQ/UurWClVReMI/AAAAAAAABN4/sytqEH39y1w/w408-h306-no/.png}}
http://sakacamprung.blogspot.co.id/2016/05/jelly-gamat-qnc.html

{{tag> software hardware infrastructure computing}}