Sunday, September 22, 2013

Read and Write to ttyS0 serial ports in Linux


Two ways to interface to the ttyS0 serial port:

1)  via terminal command line:

echo "ABCDEF" > /dev/ttyS0
cat /dev/ttyS0


To configure the port:
stty -F /dev/ttyS0 speed 9600 cs8
stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb


2) via C Program: minicom
sudo apt-get install minicom
when done use
sudo minicom -s


3) By writing your own app in C++ or C# or any other preferred Programming language:
I will have some sample working programs here soon.

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Saturday, September 14, 2013

Installing Eclipse from the website on Ubuntu 13.04

I found these instructions on one of the websites discussions:

If you've downloaded Eclipse from their official website, follow these steps for the installation.
  1. Extract the eclipse.XX.YY.tar.gz using
    tar -zxvf eclipse.XX.YY.tar.gz
  2. Become root.
    sudo -i
  3. Copy the extracted folder to /opt
    cp -r eclipse.XX.YY /opt
  4. Create a desktop file and install it:
    gedit eclipse.desktop
    and copy the following to the eclipse.desktop file.
    [Desktop Entry]
Name=Eclipse 
Type=Application
Exec=eclipse
Terminal=false
Icon=eclipse
Comment=Integrated Development Environment
NoDisplay=false
Categories=Development;IDE;
Name[en]=Eclipse
    then execute the following command to automatically install it in the unity:
    desktop-file-install eclipse.desktop
  5. Create a symlink in /usr/local/bin using
    cd /usr/local/bin
ln -s /opt/eclipse/eclipse
  6. For eclipse icon to be displayed in dash, eclipse icon can be added as
    cp /opt/eclipse/icon.xpm /usr/share/pixmaps/eclipse.xpm
Notice:
I found out that I need to install Java RTE or JDK from Java.com

I wanted to make sure I do not lose it again...

reference:
http://askubuntu.com/questions/26632/how-to-install-eclipse
http://www.eclipse.org/downloads/?osType=linux




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Beaglebone Black angstrom

Status Update:
This is a list of working Not working items, so you do not get disappointed after reading the post.  This is  a work in progress...

Angstrom:
GPIO
ADC
I2C1
SPI almost, having some issues with CLK, and Data input output.

ArchLinux:
:-(



First Using angstrom distribution:
opkg is the app-get for angstrom....

Linux beaglebone 3.8.11 #1 SMP Wed May 8 07:34:27 CEST 2013 armv7l GNU/Linux

after opkg update, opkg upgrade
Linux beaglebone 3.8.13 #1 SMP Thu Sep 5 16:35:35 CEST 2013 armv7l GNU/Linux


Install Sudo
opkg install sudo

Network settings:
This post here is great source for setting Static IP
http://derekmolloy.ie/set-ip-address-to-be-static-on-the-beaglebone-black/

add user:
su
useradd xyz-user
passwd xyz-user

Update Time and Time Zone:
rm /etc/localtime
ln  /usr/share/zoneinfo/EST /etc/localtime
/usr/bin/ntpdate-sync 
nano default/ntpdate     to set / enable sync server
date             to check your new time


Using GPIO:
#echo 44 > /sys/class/gpio/export

Reference:
http://www.phys-x.org/rbots/index.php?option=com_content&view=article&id=104:lesson-1-beaglebone-black-blink-led&catid=46:beaglebone-black&Itemid=81
http://www.auctoris.co.uk/2012/08/23/gpio-with-sysfs-on-raspberry-pi-part-2/


Using the I2C:
i2cdetect -y -r 1
root@beaglebone:~# i2cdetect -y -r 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --   

i2cdump -y 1 0x50 w     or
i2cdump -y 1 0x50 b

Link....
http://minix-i2c.blogspot.com/2013/07/using-i2c-tools-with-angstrom-linux-on.html



Using the SPI:
I found the required files in /lib/firmware/ BB-SPIDEV*
all I did finally, is echo this line

root@beaglebone:/lib/firmware# echo BB-SPIDEV0 >  /sys/devices/bone_capemgr.9/slots

Then ls /dev/spi* and here is what I got...

Now what is next? the question is what is really here that works?



Using Analog Inputs:


sh-4.2# echo cape-bone-iio > /sys/devices/bone_capemgr.*/slots
sh-4.2# find /sys/ -name '*AIN*'
/sys/devices/ocp.2/helper.14/AIN0
/sys/devices/ocp.2/helper.14/AIN1
/sys/devices/ocp.2/helper.14/AIN2
/sys/devices/ocp.2/helper.14/AIN3
/sys/devices/ocp.2/helper.14/AIN4
/sys/devices/ocp.2/helper.14/AIN5
/sys/devices/ocp.2/helper.14/AIN6
/sys/devices/ocp.2/helper.14/AIN7
sh-4.2# cat /sys/devices/ocp.2/helper.14/AIN1
OR  
sh-4.2# cat /sys/devices/ocp.2/helper.14/AIN*



References:
http://www.gigamegablog.com/2012/01/29/beaglebone-linux-101-configuring-angstrom-linux/
http://beaglebone.cameon.net/home/reading-the-analog-inputs-adc
http://www.gigamegablog.com/2012/01/22/beaglebone-coding-101-using-the-serial-and-analog-pins/


BeagleBone Black Updating the Software
Getting Started with BeagleBone Black
============================================================
Now, I am trying arch Linux to see if it works better:

http://archlinuxarm.org/platforms/armv7/ti/beaglebone-black


 Steps I used:

  1. pacman -Syu
  2. passwd
  3. pacman -S sudo adduser gcc make
  4. adduser username
  5. EDITOR=nano visudo
  6. copy my files




To Setup eth0 configuration Static:
systemctl disable netctl-ifplugd@eth0
cp /etc/netctl/examples/ethernet-static /etc/netctl/ethernet-static
nano /etc/netctl/ethernet-static #edit to you liking
Use /24 for  255.255.255.0
Use /16 for 255.255.0.0
netctl enable ethernet-static
reboot.





References:
http://hipstercircuits.com/enable-spi-1-0-and-1-1-with-device-tre-overlays-on-beaglebone/




References & Commands:
How to auto mount drive at boot...            /etc/fstab   http://www-rohan.sdsu.edu/doc/debian/ch-disks.html
Debian Tutorial http://www-rohan.sdsu.edu/doc/debian/

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Thursday, September 5, 2013

Adding GPIO SPI and I2C options to your Arch Linux Kernel

Edit 12/07/2013:
Thanks to Mr. Mauro Ribeiro, I was able to get the SPI on my ODROID-X2 board and, now I will be working on the actual development of the main project, which is, Controlling the world via SPI bus...
Mr. Mauro Ribeiro modified the kernel on https://github.com/hardkernel/linux/tree/odroid-3.8.y
and now we can build kernels with SPI1 enabled.


First lets put some list of GPIOs I used on this board:
105, 102, 110, 117
GPIO are found @
/sys/class/gpio
and then need to export as root...
#echo "105" > export
# echo "102" > export
# echo "110" > export
# echo "117" > export
# echo "out" >  gpio105/direction
# echo "out" >  gpio102/direction
# echo "out" >  gpio110/direction
# echo "out" >  gpio117/direction


# echo "1" > gpio105/value
# echo "0" > gpio105/value
# echo "1" > gpio102/value
# echo "0" > gpio102/value
# echo "1" > gpio102/value
# echo "1" > gpio105/value
# echo "0" > gpio105/value


To read from GPIO that is set as Input:
# echo "in" >  gpio105/direction
# cat /sys/class/gpio/gpio105/value



So, I had to build my Kernel to be able to enable the SPI "I hope that it is going to work..."
Make sure you have at least large SD drive, I used 8 GB and did not work.  So, 16 GB is recommended...

Edit:
OK, my 8GB SD card was not fully used, I had to use gparted and resize the partition to use the full SD card size.

1. Get the source code from the link below, I had to get linux-odroid-3.8.y.zip as others did not have my odroidx2_ubuntu_defconfig configuration file.
https://github.com/hardkernel/linux

2. Now you will have to unzip the file, so crate a folder in your home directory and save the downloaded zip file to it then use
unzip linux-odroid-3.8.y.zip
I installed 7z by using
pacman -S p7zip
Then
7z x -y zip.file.name
You will also need to get
pacman -S base-devel

Also you will need:
pacman -S gcc  make


3. make sure you work from the new created folder, linux-odroid-3.8.y
cd linux-odroid-3.8.y

zcat /proc/config.gz > .config

for Latest SPI enabled configuration, I used the following
make odroidx2_defconfig

4. Run make oldconfig
4. Now, run make menuconfig,  this will allow you to go and enable other options before you build the new kernel

5. make sure you exit and save changes when you are done,  now you should have a .config file in the current folder

6. To start build Run
make -j8
-j8 will allow the make to run up to 8 simultaneous jobs
This part will take a long time so do not set and wait for it to finish

7. Now, Run,
make -j8 modules
sudo make modules_installmake zImage

 8.  Rename the current zImage to zImage.prev and copy the new zImage to /boot

kernelversion=`cat ./include/config/kernel.release`
sudo cp /boot/zImage /boot/zImage.prev
sudo cp /boot/uInitrd /boot/uInitrd.prev
sudo cp arch/arm/boot/zImage /boot
sudo cp .config /boot/config-$kernelversion


I used the steps from this location
http://odroid.us/mediawiki/index.php?title=Kernel_compiling
http://forum.odroid.com/viewtopic.php?f=52&t=81

Make sure your time is set to the correct time:
Time-Date set and check
sudo timedatectl set-time "2013-08-14 14:52:00"
timedatectl status
timedatectl set-timezone America/New_York



Warning: you may need to install module-init-tools

Now, Adding more notes about Device Tree overlay:
Install  sudo pacman -S  dtc-overlay
I need to find out where to find the correct dtc files to compile on the Odroid-x2


New Board found:
http://www.variscite.com/products/system-on-module-som/cortex-a9/dart-4460-cpu-ti-omap-4-omap4460?gclid=CJbkwpP3_roCFdF_Qgod0kMAtw

http://armbedded.eu/node/318


resources:
https://github.com/hardkernel/linux
http://archlinuxarm.org/developers/building-kernels
https://wiki.archlinux.org/index.php/Kernel_Compilation#Compilation
http://odroid.us/mediawiki/index.php?title=Kernel_compiling

This is my link to ODROID Forum question:
http://forum.odroid.com/viewtopic.php?f=17&t=1085

Good Links to building kernel:
http://docs.kali.org/development/custom-odroid-kernel-image
https://wiki.archlinux.org/index.php/Kernels/Compilation/Traditional


http://www.egr.msu.edu/classes/ece480/capstone/fall12/group02/documents/Mark-Birdsall_App-Note.pdf



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Run Android Jelly Beans on ODROID-X2 Step by Step

After all the problem getting SPI working on the ODROID-X2 Board, I decided to visit the Android world and see what it takes to put it on the ODROID-X2 Board.  And I was so amazed how easy it is...





Android 4.1 Beats-1.6:
http://com.odroid.com/sigong/nf_file_board/nfile_board_view.php?keyword=&tag=ODROID-X2&bid=182

Android 4.1 Beats-1.8 update:
http://com.odroid.com/sigong/nf_file_board/nfile_board_view.php?keyword=&tag=ODROID-X2&bid=192

How to install the update:



Google Apps:
http://goo.im/gapps/gapps-jb-20121011-signed.zip




Building Android Kernel:
http://forum.xda-developers.com/showthread.php?p=38144723

Open source from Samsun:
http://opensource.samsung.com/

Reference to building the Android ODROID-X2 kernel
https://github.com/leekyuhyuk/Odroid-X2-Android-OS-4.1-Kernel
check the readme , build.sh

Reference to Tool Chain download:
http://dev.odroid.com/projects/4412boot/#s-10.1
https://sourcery.mentor.com/GNUToolchain/release1294?lite=arm&cmpid=7108&downloadlite=scblite2012&signature=4-1377441150-0-1ca6798bb3b7e362eb68e47b2522d2d75e2f1f79

Install 32bit libraries on 64bit Linux:
install ia32-libs


Main Source Tree for Hard-Kernel:
http://dn.odroid.com/



Great News/Progress:
After re-building the kernel, and it was finished I found the following:

LD [M]  drivers/spi/spidev.ko
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready

So, I know now there are some module I need to load/copy with the kernel
I used the following line to copy my new Android Kernel to the board.
busybox dd conv=notrunc seek=1256960 bs=1 if=/tmp/zImage of=/dev/block/mmcblk0

I built it with built-in instead and now I see spidev in the /sys/class/sysdev and in the sys/modules/spidev  but I am not sure yet how it can be used? or is it working

I need a different option to add spi_master

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