Using PlatformIO with TI MSP430 LunchPads
Published at December 8, 2015 · 6 min read
PlatformIO is very interesting project that aim to solve very important problem of configuring deployment environment for embedded systems. IMHO good approach is to focus on modularity (various IDE can be used, even Vim) and simplicity (in best case 2 command should be enough to deploy first code). Recent years we have explosion of bootstraping applications (ie.vagrant, puppet). Most of them seems to follow git-like command line interface and getting a lot of attention from programmers community....
UEFI Application development in OVMF
Published at November 21, 2015 · 3 min read
OVMF (Open Virtual Machine Firmware) is a project that aim is to enable UEFI support in various virutal machines. According to whitepaper various projects have interest in supporting OVFM ie. VirtualBox, Xen, BHyVe and of course QEMU. Why someone may be interested in OVMF ? IMHO the most important reason is that OVMF give ability to develop UEFI applications without using real hardware. This speeds up development cycle by giving ability to start before hardware prototype arrive....
Linux, RPi and USB over IP updated
Published at October 27, 2015 · 4 min read
Because of increasing interesting in USB over IP topic I decided to refresh my old post. I will focus on doing the same thing with more recent version of Raspabian. If you need more information please read my previous post. Setup SD card First get recent version of Raspbian, then unzip and dd it to SD card: 1 sudo dd bs=4M if=2015-09-24-raspbian-jessie.img of=/dev/sdc If you are impatient and want to know what happen in background you can use this method of tracking dd progress:...
Building Android 4.2 LiveSuit image for Cubietruck (Allwinner A20)
Published at September 16, 2015 · 7 min read
Treating A20 boards like outdated piece of HW by vendors makes building Android for Cubietruck not trivial task. Finding documentation, mailing list or blog post that clearly describe steps is almost impossible. Most of links to SDK are broken and instructions outdated. Because of that I decided to leave couple notes for me and all of you lost in this madness. Hopefully below steps can build foundation for future development and improvements....
Setup for Linux kernel development on Cubietruck
Published at September 1, 2015 · 8 min read
During last couple of months I see quite big interest in building products on A20 SoC. This chip can be bought for 6USD in quantity. Most important features are: Dual-Core ARM Cortex-A7 (ARMv7) Mali-400 MP2 HDMI, VGA and LCD MMC and NAND OTG and 2 Host ports Tracking media related to low-end mobile market IMHO the hottest SoCs are Allwinner A20 and Rockchip RK3288. A20 ship with dozen development boards like Cubieboard or pcDuino series, Banana Pi, MarsBoard or Hummingbird....
ESP-12 update to SDK v0.9.5 and AT v0.21.0.0? noobs tutorial
Published at January 25, 2015 · 5 min read
January 23th Espressif published new ESP IOT SDK on their forum v0.9.5. My ESP-12 came with with pretty old version so I decide to update it to latest one: 1 2 3 4 5 6 7 8 9 10 AT+RST OK y_RSöfJ[úndor:www.ai-thinker.com Version:0.9.2.4] ready AT+GMR 0018000902-AI03 OK ESP-12 firmware update pin configuration As picture presents in addition to normal operation we have to pull down GPIO0 and pull up GPIO2....
Published at January 24, 2015 · 3 min read
ESP8266 is a SoC made by Espressif. For last couple of months this chip is a rockstar of HackADay and makers community around the Internet. Mostly because of WiFi modules built based on it (ESP-XX family). Rich interface (GPIO, SPI, SDIO, I2C) give those boards potential to be standalone MCU with WiFi capability for wide range of applications. In quantity you can get ESP-01 for $2.7 (for 1kpcs). Of course there is no free lunch....
Raspberry Pi kernel repository aggregating patches for Linux mainline
Published at October 15, 2014 · 3 min read
Since several months I’m trying to find my way to embedded Linux programming. My hardware set was very limited I had only one board that can be called “embedded” and it was Raspberry Pi. Because I am more interested in firmware/OS level then hardware I tried to figure out what is going on with RPi kernel. After taking brief review of raspberrypi/linux GitHub repository I realized that close to my heart is upstreaming effort....
virtualbox-dkms: fix alloc_netdev problems when compiling with 3.17.0-rcX headers
Published at September 20, 2014 · 4 min read
Intro Because of my bug hunting approach of using latest kernel I experienced problem with compiling VirtualBox modules with 3.17.0-rc5 version on my Debian Jessie. Issue is well known and described for examples here. Problem manifest itself with: 1 2 3 4 5 6 7 8 9 10 11 12 ------------------------------ Deleting module version: 4.3.14 completely from the DKMS tree. ------------------------------ Done. Loading new virtualbox-4.3.14 DKMS files... Building only for 3....
How to fix backlight issue on IdeaPad y510p
Published at August 23, 2014 · 1 min read
Today I decide to switch to latest kernel (3.17-rc1) on my IdeaPad y510p. I hit only one annoying problem until now - after booting my main screen was dimmed. I tried all instructions from top google hits for all possible configurations of keywords linux, y510p, backlight issue, etc. Especially I tried all methods from Arch Wiki. Finally I found solution, by greping modinfo for my Intel graphics card: 1 2 3 4 5 [23:55:24] pietrushnic:~ $ sudo modinfo i915|grep backlight parm: invert_brightness:Invert backlight brightness (-1 force normal, \ 0 machine defaults, 1 force inversion), please report PCI device ID, subsystem \ vendor and subsystem device ID to dri-devel@lists....