Tag: software

Undelete Files with SnapRAID

Today I accidentally deleted a whole folder of important documents on my OpenMediaVault(OMV) NAS, while doing some cleaning up.
Of course I would have a backup of the folder on an external hard-drive, but this was the perfect opportunity to test SnapRAID.

Anlogic TANG PriMER dev board

Recently I purchased a Sipeed TANG PriMER development board featuring an Anlogic EG4S20 FPGA (codenamed Eagle S20). The only reason I bought the board was to see what Anlogic FPGAs are capable of, since I had never heard of that FPGA vendor before. No need to think twice when the board costs less than 20$.

How to set up NordVPN on Ubuntu

There are two ways to set up a VPN connection with NordVPN on Ubuntu. The first one is to add NordVPN’s package repository to the apt sources and then install the nordvpn client via a simple sudo apt install nordvpn. The second one is to install OpenVPN and configure it to use the servers of NordVPN.
This how-to was written for Ubuntu 18.04 LTS (Bionic Beaver).

Realizing Arbitrary Functions with ROM-Based Lookup Tables

When tasked with the implementation of a rather complex function, e.g. a polynomial of higher order, the resource utilization quickly shoots through the roof if implemented straight forward (also called the naïve implementation).
To avoid this it is often easier, simpler and faster to use a lookup table (LUT) solution.

Extracting MPEG2-TS from Wireshark capture file

When working with IP multicast streams it can sometimes be useful to convert a captured IP stream file to a corresponding MPEG2 transport stream (TS) file. Wireshark has a built-in capability to extract MPEG2-TS packets from the UDP packets of an IP multicast stream. This feature is somewhat hidden away in the menus and not obvious to find.

STM32 Programming Entry

For the STM32 family of microcontrollers a number of different support libaries are available: Cortex Microcontroller Software Interface Standard (CMSIS), Standard Peripheral Library (SPL), Hardware Abstraction Layer (HAL).

More Windows 10 Issues

On my new Windows 10 installation I came across a few more issues:

LibreOffice did have a nasty offset where the mouse pointer would click way above where it was pointing. The solutions to this bug was to disable OpenGL rendering as described here.

Another bad experience was with VirtualBox which would sometimes boot up virtual machines with corrupted graphics where nothing is readable or even recognizable. The solution to this behavior seems to be to set the “Override high DPI scaling behavior” setting to “Application”; the setting can be found by right clicking on the VirtualBox shortcut/executable > Properties > Compatibility > Override high DPI scaling behavior. I found the solution here.

Accessing ext4 partitions from Windows 7

It is a pain in the ass.

Several Windows tools exist which add support for the file systems used in the Linux world.

  • ext2fs
  • ext2ifs
  • linux reader
  • extfs
  • ext2read

See here for a comparison of existing tools.

However, I can not say that any of these worked properly for ext4. Not to speak of ZFS or btrfs 😉

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