Booting BeagleBone Black from SD

http://embeddedcomputer.nl/lanotattachments/download/file/id/3/store/1/


Booting Ubuntu on BeagleBoard Black
http://circuitco.com/support/index.php?title=Booting_Ubuntu_on_BeagleBoard_Black


Linux on ARM / Home:
http://eewiki.net/display/linuxonarm/BeagleBone+Black

uEnv.txt based bootscript:

Beaglebone Black CircuitCo support page:
http://circuitco.com/support/index.php?title=BeagleBoneBlack

BeagleBone Boot Sequence.
http://elinux.org/EBC_Exercise_21a_Boot_Sequence#Booting_Up


Unbrick
http://hipstercircuits.com/unbrick-beaglebone-black-without-erasing-emmc/

Angstrom Cloud9 distribution download
http://downloads.angstrom-distribution.org/demo/beaglebone/

Burning an IMG File
http://doc.freenas.org/index.php/Burning_an_IMG_File

6+ hour:
Building Angstrom for Beaglebone from Source:
http://derekmolloy.ie/building-angstrom-for-beaglebone-from-source/


http://nomel.tumblr.com/post/30357133735/beaglebone-tutorial-how-to-compile-kernel-modules-and

RT-N16

http://www.dd-wrt.com/wiki/index.php/Asus_RT-N16

http://www.anandtech.com/show/6180/open-source-router-platforms

OpenWRT
http://wiki.openwrt.org/toh/asus/rt-n16#from.linux

interrupt, Callback, Software Debounce, RPi

raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-2

Disabling the beaglebone black HDMI Cape

mount /dev/mmcblk0p1  /mnt/card

Edit the uEnv.txt on the mounted partition:

nano /mnt/card/uEnv.txt

To disable the HDMI Cape, change the contents of uEnv.txt to:

optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

Save the file:

Ctrl-X, Y

Unmount the partition:

umount /mnt/card

Reboot the board:

shutdown -r now

Wait about 10 seconds and reconnect to the BeagleBone Black through SSH. To see what capes are enabled:

cat /sys/devices/bone_capemgr.*/slots

Every line shows something like “P-O-L” or “P-O–”. The letter “L” means 
the Cape is enabled; no letter “L” means that it is disabled. You can 
see here that the HDMI Cape has been disabled, so pin 27 to 46 on header
 P8 are now available to use

http://www.logicsupply.com/blog/2013/07/18/disabling-the-beaglebone-black-hdmi-cape/ 

mkimage command not found

http://shuiqingwang.blogspot.com/2012/07/solvedmkimage-command-not-found-u-boot.html

Problem: "mkimage" command not found - U-Boot images will not be built

Solution: sudo apt-get install uboot-mkimage

               make the kernel again

http://forkbomb.dadacafe.org/blog/__34__mkimage__34___command_not_found_-_U-Boot_images_will_not_be_built/


http://processors.wiki.ti.com/index.php/Linux_Toolchain

Pi expand board

Camera Documentation

http://www.raspberrypi.org/archives/4483


Hardware control
http://www.raspberrypi.org/archives/4492
Laika
http://www.project-laika.com/about-laika

RTC real time clock and raspberry pi

http://en.wikipedia.org/wiki/Real-time_clock

Supercapacitor

Setup with raspberry pi
http://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/set-rtc-time

NI Labview - cRio 0 Arduino setup

google Code project:
https://code.google.com/p/labviewduino/

Official Support Webpage:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/209835


Setting up the cRIO (IP, and formatting)
Creating and Running a LabVIEW Project
http://www.youtube.com/watch?v=7GbpOIK9rmg


Arduino Labview interface
http://www.youtube.com/watch?v=n3AwL-_UCS4

Support webpage
https://decibel.ni.com/content/groups/labview-interface-for-arduino

Detailed program tutorial:
http://www.youtube.com/watch?v=RGRhIQneO6w

University of Central Florida
MMAE (Department) Robotic Course Webpage
http://www2.mmae.ucf.edu/wiki/MMAE_Graduate_Robotics

System integration solution
https://decibel.ni.com/content/servlet/JiveServlet/downloadBody/18322-102-1-34229/EML%206808_demo5.pptx

Interface download for Labview 2012:
https://decibel.ni.com/content/thread/13798

Circular buffer and Sliding Sindow Step Detection Implementation

Circular Buffer/Cyclic Buffer/ring buffer

Single fixed size buffer, end to end:

Easily to buffering data streams

FIFO, implementation strategy for a queue


http://en.wikipedia.org/wiki/Circular_buffer

Difficulties

Full/Empty Distinction


Library
http://websvn.hylands.org/filedetails.php?repname=Projects&path=%2Fcommon%2FCBUF.h&rev=0&sc=0%3E

NI cRIO setup

General Tutorial of NI cRIO Hardware-Software setup
http://www.ni.com/gettingstarted/setuphardware/compactrio/

Make sure correct version of LabView
http://joule.ni.com/nidu/cds/view/p/id/3769/lang/en

DriverSet Collection Page
http://search.ni.com/nisearch/app/main/p/bot/no/ap/tech/lang/en/pg/1/sn/ssnav:ndr/q/ni-rio/

Version List
ftp://ftp.ni.com/pub/devzone/tut/crio_software_versions.htm

Driver List
http://www.ni.com/nisearch/app/main/p/bot/no/ap/tech/lang/en/pg/1/sn/catnav:du,n8:4.9547.9548,ssnav:ndr/

cRIO crossover cable setup
http://forums.ni.com/t5/LabVIEW/How-to-connect-cRIO-with-Computer-via-cross-cable/td-p/1080146

Lost bytes and AVR interrupt

http://robotics.stackexchange.com/questions/99/how-to-manage-interrupts-on-an-avr

Atmega bootloader programmer

http://www.gammon.com.au/forum/?id=11635

Daily reading; watchdog Timer and AVR/Arduino

Typically, single-stage watchdog timers are used to simply restart the computer, whereas multistage watchdog timers will sequentially trigger a series of corrective actions, with the final stage triggering a computer restart.

In embedded systems and control systems, watchdog timers are often used to activate fail-safe circuitry. When activated, the fail-safe circuitry forces all control outputs to safe states (e.g., turns off motors, heaters, and high-voltages) to prevent injuries and equipment damage while the fault persists. In a two-stage watchdog, the first timer is often used to activate fail-safe outputs and start the second timer stage; the second stage will reset the computer if the fault cannot be corrected before the timer elapses.

Watchdog timers are sometimes used to trigger the recording of system state information—which may be useful during fault recovery^[3]—or debug information (which may be useful for determining the cause of the fault) onto a persistentmedium. In such cases, a second timer—which is started when the first timer elapses—is typically used to reset the computer later, after allowing sufficient time for data recording to complete. This allows time for the information to be saved, but ensures that the computer will be reset even if the recording process fails.


http://arduino.cc/forum/index.php?topic=128717.0

External Hardware WatchDog:
http://www.practicalarduino.com/news/id/471

#include <avr/wdt.h>

void setup ()

{

  Serial.begin (115200);

  Serial.println ("Restarted.");

  wdt_enable (WDTO_1S);  // reset after one second, if no "pat the dog" received

 }  // end of setup

void loop ()

{

  Serial.println ("Entered loop ...");

  wdt_reset ();  // give me another second to do stuff (pat the dog)

  while (true) ;   // oops, went into a loop

}  // end of loop

The more severe issue is, that the bootloader does not de-activate the watchdog upon reset, so that one can end up with endless resets.

the official ATmega328 bootloader (optiboot) deactivates the watchdog on reset.
The official MEGA bootloader does not.
I'm not sure about Leonardo or Due.

AVR Watch Dog Macro

http://www.nongnu.org/avr-libc/user-manual/group__avr__watchdog.html

stackexchange Arduino Watch Dog Example
http://electronics.stackexchange.com/questions/18/watch-dog-timer-arduino

Watch dog AVR Library

Bootloader Selection
http://arduino.cc/forum/index.php?PHPSESSID=c322bf19e2be8fb4daedb3e931a0c8f0&topic=128717.0

A arguable solution? 

http://www.jasoncavett.com/2011/03/accessing-watchdog-timer-on-arduino-uno.html

Blocking service serial.print in WDT_ISR?

Arduino Function Optimization

Adventures with Arduino: From 41 instructions to 1
http://www.rorydriscoll.com/2011/02/01/adventures-with-arduino-from-41-instructions-to-1/

I/O Operation for AVR

AVR ports are labeled port A though port D on most DIP packages (look at the datasheet for your AVR to find the right port.) For instance, for port B:

You write to port B with the PORTB register
You read (input) port B with the PINB register

The input or output status of each bit in the port can be controlled with the DDR (Data Direction Register), so that each pins in a single port can serve different purposes.

Set port B, pin 2 for input (this clears bit DDB2 in the DDR):

DDRB &= ~_BV(DDB2);

To get the value on port B, pin2:

val = PINB & _BV(PB2);

This ANDs the PINB register with the bit value of pin 2 (PB2)--masking out the other unwanted bits. 



Dr. Dobbs,
Al Williams 
DigtialWrite Optimization
http://v4.drdobbs.com/blogs/embedded-systems/240148309

Arduino Data logging (with SD)

http://www.mauroalfieri.it/en/elettronica/data-logging-con-arduino.html

A note on "const"

A Note On const

Many users bring up the idea of using C's keyword const as a means of declaring data to be in Program Space. Doing this would be an abuse of the intended meaning of the const keyword.

const is used to tell the compiler that the data is to be "read-only". It is used to help make it easier for the compiler to make certain transformations, or to help the compiler check for incorrect usage of those variables.

For example, the const keyword is commonly used in many functions as a modifier on the parameter type. This tells the compiler that the function will only use the parameter as read-only and will not modify the contents of the parameter variable.

const was intended for uses such as this, not as a means to identify where the data should be stored. If it were used as a means to define data storage, then it loses its correct meaning (changes its semantics) in other situations such as in the function parameter example.

National Instruments In Vehicle Acquisition Table

Shared Variable and Single Process Techniques for programming NI LabView

https://decibel.ni.com/content/docs/DOC-19097

Non block Interrupt + USART AVR Communication

http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=60207&start=0

Embedded State Machines Implementation

http://isa.uniovi.es/docencia/redes/EmbeddedSatateMachinesImplementation.pdf

AVR ADC Example

Input Scanning
http://www.electronics-base.com/index.php/avr-tutorials/analog-digital-converter-adc/102-avr-adc-inputs-scanning-example

ADC atmega 328
http://www.embedds.com/adc-on-atmega328-part-1/

Multiple Channels
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=101325