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Posts Tagged ‘embedded system’

Raspberry Pi: Membrane (Matrix) Keypad as GPIO Input

In ARM Linux on 13 March 2013 with Comments Off 4549 views

Membrane matrix keypad using GPIO as Raspberry Pi input has been my goal since WiringPi deployed in the first place. To begin with, GPIO hacking was initially started with some important basics (see previous post). Without external system (other interfacing chip), the 3×4 membrane keypad reserved all seven GPIO pins plus one pin used for [...]

Raspberry Pi GPIO Input Button Basics

In ARM Linux on 11 March 2013 with no comments 2654 views

When you start hacking Raspberry Pi’s GPIO, first thing to keep in mind is the +3.3V CMOS logic level voltage despite the 5V supply. Secondly, read references about current limiting resistors (eLinux Wiki has a section there). What to avoid then? Try not to physically short the GPIO pin to ground when it is programmed [...]

Zabbix Proxy: distributed NMS monitoring via embedded Linux (Ubuntu on BeagleBoard)

In ARM Linux on 19 July 2012 with no comments 653 views

As already mentioned in previous post’s introduction, proof of concept on how Zabbix Proxy works under unreliable communication is what this next post about. The idea is to have these scenarios tested: independent SNMP data polling by individual NMS proxy (embedded system) intermittent connection between main/master NMS server with its proxy Of course we’ll do [...]

Compile Zabbix Proxy in Ubuntu ARM (BeagleBoard)

In ARM Linux, Ubuntu on 17 July 2012 with no comments 1488 views

I needed to tackle practical limitation of SNMP monitoring under unreliable communication, a serious consideration was made for Zabbix Proxy. It was an option said to be ready for embedded hardware. I already had BeagleBoard xM Rev C running Ubuntu 11.10 Oneiric and needed to proof that it would port functionally to this Linux ARM [...]

USB WiFi Stick on Beagleboard xM Using wpa_supplicant

In ARM Linux, General Linux, Ubuntu on 7 March 2012 with no comments 788 views

One of the most popular USB WiFi sticks in Indonesian market is TP Link which is actually a Ralink wireless adapter (looking at its vendor ID code). Attaching it using wpa_supplicant without explicit driver assignment will return the following error lines ioctl[SIOCSIWENCODEEXT]: Invalid argument ioctl[SIOCSIWENCODEEXT]: Invalid argument Within minutes it will also crash the system [...]

Compile USB Serial Modem Using option.c (Ubuntu on Beagleboard xM)

In ARM Linux, General Linux, Ubuntu on 9 January 2012 with 2 comments 4155 views

Despite possibility to use (1) $ modprobe -v usbserial vendor=0x05c6 product=0×0015 or (2) usb-modeswitch, (3) Matthias Urlichs initially wrote option.c driver as a way to insert USB modem as kernel module. This driver exists because the “normal” serial driver doesn’t work too well with GSM modems. Issues: – data loss — one single Receive URB [...]

Ubuntu on Beagleboard xM with Easycap Video Capture (Compiling Driver)

In ARM Linux, Ubuntu on 31 December 2011 with no comments 1757 views

Attempt to run Ubuntu in BeagleBoard xM rev C board has taken me to try various options of kernel and release. The goal was to have both Ubuntu and widely-available Easycap as video input via the USB of this compact TI OMAP board. Porting Ubuntu would spare us some flexibility to try different alternatives of [...]

Hello World with JamVM Embedded JVM on Ubuntu ARM

In ARM Linux, Ubuntu on 12 December 2011 with no comments 1217 views

While waiting for my BeagleBoard xM shipment, I was considering Java as one of the possible application platforms. Anyhow, the keyword “embedded Java ARM” landed me to the tiny JamVm. This JVM is said to be working with ARM Cortex A8 which can be emulated under QEMU running Ubuntu ARM. The fact that there had [...]

Ubuntu ARM on QEMU Processor Emulator

In ARM Linux, Ubuntu on 27 November 2011 with no comments 1033 views

There are times when you need to try things on virtualized environment before hand e.g. 1) checking application functionality or 2) actual device shipment is still on its long way. Those were also my cases with ARM Linux. Unlike virtualization in production environment however, putting software to emulate CPU architecture will slow down the guest [...]

Running Ubuntu on DevKit8500D (Natty Kernel and Lucid RootFS)

In ARM Linux, Ubuntu on 28 October 2011 with no comments 976 views

BeagleBoard xM that comes with Texas Instruments’ DM3730 DaVinci™ processor has its Chinese sister from Embest, the DevKit8500D evaluation kit. This similarity and eLinux wiki (showing working previous DevKit8000) have made me confident that Ubuntu would also port to this board with no hassle. As always, that wasn’t the story. I tried preinstalled images available [...]