• #Ubuntu 16.04 LTS: Broken SD Card Reader Support

      General | 1 min | 208

      broken sd support
      linux ubuntu 16.04 lts
      sd card reader

      I am writing this post as a tutorial or a 'keep' note for myself, but I think it could be interesting for a lot of people. At work I'm using a Latitude Dell Laptop with dual boot (Ubuntu 16.04 LTS and Windows 10). The laptop has a SD card reader. Usually I work under Ubuntu while I am programming, and the SD card reader support is broken! But typing the following on a terminal, makes it works again:

      sudo rmmod sdhci_pci sdhci_acpi sdhci
      sudo modprobe sdhci debug_quirks2="0x10000"
      sudo modprobe sdhci_pci sdhci_acpi sdhci

      It seems to be a problem since Linux kernel version 4.1.8. A bug report he...

    • #Raspberry Pi: The N-queens Problem (benchmark) Preempt-RT vs. Standard Kernel

      Real Time Systems | 5 min | 660

      kernel patching
      multi-thread n-queens
      raspberry pi v3 b+ (b plus)
      real time system

      N-Queens Problem: A Benchmarking Solver for Raspberry Pi

      The N-Queens Problem/Puzzle is a well-known problem that consists of placing N chess queens on an N × N chessboard so that no two queens attack each other. For example, one possible solution to the N-queens problem for N = 4 is the following:

      N-queens problem (N=4)
      Fig. 1: N-queens problem example (N = 4). Source: Google Optimization Tools

      As you can see, no two queens are on the same row, column or diagonal. Usually the problem consists to find all possible solutions, rather than one optimal solution.

      I wrote a script in Python that calculates ...

    • #Rapberry Pi: Preempt-RT Kernel Performance on Rasbperry PI 3 Model B+

      Real Time Systems | 3 min | 1497

      kernel patching
      raspberry pi
      real-time linux

      The Raspberry Pi 3 Model B+ (Fig. 1) is now on sale and I bought one two weeks ago. The main modifications are the followings:

      • A 1.4GHz 64-bit quad-core ARM Cortex-A53 CPU
      • Dual-band 802.11ac wireless LAN and Bluetooth 4.2
      • Faster Ethernet (Gigabit Ethernet over USB 2.0)
      • Power-over-Ethernet support (with separate PoE HAT)
      • Improved PXE network and USB mass-storage booting
      • Improved thermal management
      Raspberry Pi 3 B+
      Fig. 1: Raspberry Pi 3 Model B+

      The Raspberry Pi uses now the LAN2515 chip from Microchip instead of the LAN9514 for Ethernet and the USB Ports.

      If you are looking for some Benchmarkin...

    • #Raspberry Pi: Preempt-RT Kernel 4.14.y on Raspberry Pi

      Real Time Systems | 1 min | 179

      kernel 4.14.y
      kernel patching
      raspberry pi

      The forked rpi-4.14.y-rt repo by TiejunChina is now a branch under the official Raspberry Pi repo. That means you need to type the following to clone the Preempt-RT patched Kernel

      ~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git
      ~/rpi-kernel$ cd linux
      ~/rpi-kernel/linux/ git checkout rpi-4.14.y-rt

      Then, you can follow the tutorial from here.


    • #Raspberry PI Zero W: Preempt-RT Kernel Performance (updated: 18.03.2018)

      Real Time Systems | 2 min | 692

      kernel patching
      raspberry pi zero

      Today I patched the kernel of a Raspberry Pi Zero W with Preempt-RT. I used the repo TiejunChina.

      Update 18.03.2018: The official Preempt-RT patched Rasbian repo is here.

      ##~/rpi-kernel$ git clone https://github.com/TiejunChina/linux.git # update 18.03.2018: old repository##
      ~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git # update 18.03.2018: new repository
      ~/rpi-kernel$ cd linux
      ~/rpi-kernel/linux$ git checkout rpi-4.14.y-rt  # today the kernel version is 4.14.22
                                                      # with rt17 resulting in 4.14.22-rt17+ 

      You can find a complete...

    • #Pagekit: Blog & Gallery Extension & AdsenseKit

      Web designs | 2 min | 94

      node js
      web development
      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      I've been working with web development this weekend. I hope you didn't have to wait because of a maintenance dialog or a 500 error due to the updates! I updated three things on the blog:

      I forked the first two repositories and modified them. The last one is a package that I designed to manage the Adsense Ads if you use Pagekit as CMS.

      Blog Extension

      I added the visitor counter for the blog post. You can see the eye over the t...

    • #Tutorial: Installing dependencies on MicroPython

      MicroPython | 1 min | 309


      While I was reading my getting stated tutorial about MicroPython again, I noticed that I've forgotten to tell something about dependencies or packages.

      Here is possible to find some MicroPython packages. On the WeMos or the ESP8266, it is possible to install these packages using the upip package manager. The WiPy doesn't have the package.

      To download the new packages, you need to connect the board to the Internet. I take the WeMos as example and typing the following, you can connect the board to your WiFi router:

      ssid_ = <your_ssid>
      wp2_pass = <your wpa2 password>
      import network
      sta_if = net...
    • #Photo Gallery: Bangkok

      Web designs | 1 min | 62


      As I promised some photos of Bangkok (Thailand). Enjoy!

      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.
    • #Raspberry Pi: Preempt-RT vs. Standard Kernel 4.14.y

      Real Time Systems | 5 min | 2269

      kernel patching
      raspberry pi
      real time system
      real-time linux

      The last week I was working on a real-time application (with a 1 ms sample time) that runs on an ARMv8 Cortex-A53 (Raspberry Pi 3 Model B based board) and I was wondering the differences between latencies on the standard and the Real-Time (RT) Linux kernel. I had some problems with the standard kernel version, then I thought I could analyze the latencies of both kernels, and make some conclusions. Many test are available but with older kernel versions. The tests were performed using the Raspbian Kernel 4.14.21 and the Preempt-RT Patch 4.14.21-rt17!

      Hardware & Software

      To follow the DIY parts, ...

    • #Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y

      Real Time Systems | 6 min | 8237

      kernel patching
      raspberry pi
      real time system

      There are a lot of tutorials for Raspberry Pi kernel patching using Preempt-RT, but I needed about 15 hours to get it working! I hate Kernel patching! and I have to say, that's not my first time. I have a system working with Ubuntu, RTAI and an Ethercat master. I patched the system more than once. But it is/was always a new thing! and It costs a lot of time! ;)

      Then, you have another tutorial here. I only hope that the repo gets official. It could reduce the time to get the RT ...

    • #Photo Gallery: Melbourne

      Web designs | 1 min | 60

      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      As I promised some photos of Melbourne (Australia). Bangkok photos are coming this week.

      I don't know if you noticed, but I added two new repositories to GitHub:

      Both repositories are extensions for PageKit. The first one allows you to add Google Adsense ads to the posts. The second one extends the PageKit blog plugin to add categories and tags to the blog posts. I was/am quite busy these weeks, but I am writing the README files. I need to check them...

    • #Micropython: Merry Xmas & Happy New Year!

      MicroPython | 4 min | 153

      xmas lights

      It has been a while since my last post! Sorry, I was a little bit busy and then I was on a business trip in Melbourne for the CDC2017 and then I had a week holiday in Bangkok. I will be posting some photos on the next days!

      It's been a year now since I started this blog. It's a hard job to maintain it up-to-date but I still have fun writing and coding for this purpose! So let us start!


      The first video that I published a year ago was using the Wipy2.0 and a WS2812b led strip for some Christmas lights (click here). Now, this time I bought a WS2812b panel (100 bits or 10x10 pixels -or le...

    • #ProjectDIVA: Android Things DP6.0 is here!

      Android Things | 1 min | 22

      I will be testing the new release on this weekend!

      The release notes seem promising!

      I have also some new things with Docker and Raspberry Pi!

      Stay tuned!

    • #Hacking: Wemos (ESP32) & Captive Portal using MicroPython

      MicroPython | 5 min | 1353

      captive portal

      At the beginning of October I wrote a blog article called White Hacking: WeMos and SquirelCrawl!. I used the WeMos (ESP32) and the firmware provided by Hacker Arsenal to do a captive portal. As you known, a captive portal is a web page which is displayed to newly connected users before they are granted broader access to network resources [wiki]. This can be used in combination with evil portals to obtain login credentials. The firmware provided by Hacker Arsenal has multiple limitations, e.g. the web page has to be a single file, without external files, meaning that all images should be integr...

    • #Security: Phishing with Macros once again!

      Security | 2 min | 89


      And once again! Word files with Macro! But this time, I was the first one to report it to VirusTotal and Hybrid-Analysis! :)

      Virus Macro!
      Fig 1: VirusTotal report! Just only two: Fortinet sells hardware, and Qihoo-360 is in China (:S)...

      Here you have the e-mail. The sender is this time the "BOSS Last Name" (A nice improvement! :P) without address, or something like that!

      Guten Tag, Riva, Mauro 
      Bitte die gekennzeichneten Stellen ergänzen und unterschreiben, bitte mit Stempel außer das SEPA Formular. Für die Abbuchung. 
      http://docs.google.de/download/de_DE/doc/ -> with hyperlink (http://elp...