UPDATE: Test.xml file is added.
KMyMoney so far is the best GUI application for personal accounting that I've tried to use. It is not perfect, but using it in conjunction with beancount and hledger addresses my needs in financial report generation. In order to export transactions stored in KMyMoney's XML …
Recently, I was solving one of the Codewars.com problems in NASM (x86_64/amd64 Assembly) where I had to use some of the C functions available in the standard C library. During the code refactoring and optimization, I came across a segmentation fault while trying to run the executable. The program broke …
I am using plain text accounting tools like hledger and beancount alongside KMyMoney to track my financial transactions and to produce summary reports about income and expenses. If you've ever used hledger, you might like its ability to …
SSH tunnels are a great tool to solve various problems with routing where a firewall does not allow to access a certain local network. They allow forwarding connections to a specified port on the server machine to a local or remote computer through an encrypted channel.
Although there are nice …
A Xilinx Spartan 3A chip can be programmed by using UrJTAG's pld command by fixing some issues related to old instructions. In this example, a Prometheus FPGA board is used. It is composed of a XC3S50A chip which can be configured by using FT-232H circuit's MPSSE mode. To start with, …
In this tutorial, compilation and remote debugging of a simple C program on a rooted Android with ARM 64-bit architecture is described. The computer's hostname is ArchLinux and the smartphone Asus Zenfone is running on Android 5.0.2:
Install Android NDK (Native Development Kit):
Sometimes it is useful to keep the header of an output of some command while grepping the same output for something else. In the example below, the column information is absent:
Sometimes you may work on a remote machine and you don't have sudo permissions to install software you like. If the system administrator cannot add you to the sudoers file due to the strict security policy, then you will need to find a way to install your package. It happened …
There are many ways for selecting columns in a delimited text. The easiest ones require GNU awk, cut and Perl. Let's consider the following file:
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[johndoe@ArchLinux]% cat |
Quick sharing of a single/multiple files in a directory over HTTP protocol will be covered. Let's assume that the file sharing will be done over wlp3s0 Wi-Fi interface and the server's IP address is 192.168.0.24 as shown below:
A draft of the new version of the book "Speech and Language Processing (3rd ed. draft)" by Dan Jurafsky and James H. Martin is available on authors' website. Although it is produced using pdflatex with hyperref, the bookmarks of the table of contents (TOC) have an incorrect hierarchy. However, the …
Sometimes large books or theses may contain many chapters, section and subsections. Reading such PDF documents with the whole table of contents hierarchy shown in the bookmarks panel may be difficult. There is a way to tell PDF viewers to show only a specific level of bookmarks and hide its …
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wget -r -k -np -nH --cut-dirs=3 "http://www.math.uconn.edu/~leykekhman/courses/MATH3795/Lecture_slides.html" |
This is a tutorial I wrote for the "Digital Systems Design" course as an introduction to sequential design. "4-bit Serial Adder/Subtractor with Parallel Load" is a simple project which may help to understand use of variables in the "process" statement in VHDL. However, basic understanding of the circuits is necessary, …
There are no tutorials explaining the use of BSCAN_SPARTAN3 primitive on Xilinx FPGAs. It's a very useful feature, which allows to literally establish a PC-to-FPGA link over a JTAG adapter. This primitive is already used in projects such as xc3sprog and Papilio-Loader to program SPI flash memory over JTAG.
BSCAN_SPARTAN3 …
Among Spartan-3 generation of FPGAs only families 3A and 3AN have unique device identifier (device DNAs). DNA is a factory programmed unique 57-bit long number, whose the most significant bit is "1" and the second most significant bit is "0":
The Spartan 3A chip (xc3s50a) should be unconfigured (not loaded …
Pointers and arrays are a confusing subject in C. Pointers can be of different types, which makes possible pointer arithmetic to access necessary elements in an array in different ways. Consider the following examples:
int *A[5]; This is an array of 5 pointers to integers.…
The GNU Debugger (GDB) is a powerful tool to debug binary executables. It can be used to do reverse-engineering as well. Let's debug the following code written by LiveOverflow:
I wanted to write a simple program in AMD64 assembly language which prints "Hello, World!". Here is the code:
Examining data stored in the memory of the program may be interesting to understand low-level mechanism of variable management and type conversions. Let's dump content of an integer bytewise:
The following setup was used for Basys2 board with an external FTDI-based JTAG adapter. Read the previous posts to get familiar with setup.
User code register provides bit stream identification and a type of version control. To write a user code into a bit stream in Xilinx ISE, …
In order to program Basys2 board using xc3sprog and FTDI-Based JTAG Adapter, learn positions of the devices in the chain:
This tutorial concerns with explaining use of some basic Serial Vector Format (SVF) instructions assuming that you are familiar with JTAG and TAP.
As an example, reading ID codes of the devices in a JTAG chain of the Digilent Basys2 FPGA board is given. A generic FTDI-MPSSE-based JTAG adapter …
As a continuation of series of experiments with Basys2 board and FT232H-based JTAG adapter, I provide an easy way to generate SVF files for their further use in OpenOCD to program the board. No GUI interaction is needed, so it is saves a lot of time.
UrJTAG is a good low-level tool to learn boundary scan operations and play with EXTEST, INTEST instructions. Assuming that the Basys2 board is connected to a UM232H-based JTAG adapter as described in the previous article, we can test EXTEST and INTEST instructions. Note that depending on package (VQ100, CP132, …
I had a task to check whether OpenOCD can program a Spartan 3 series FPGA by means of FTDI-MPSSE-based JTAG adapter. There wasn't any chip available in my hands, so I had to experiment with existing hardware. I decided to solder the FTDI-based adapter to a Basys2 development board. The …
There may be many reasons to create a bootable USB flash drive with an installed bootloader. Not all live CD's of popular distros contain hybrid MBR/El-Torito bootable sectors. So if you are trying to write the ISO image directly into the flash drive using:
A tutorial on setting up Zotero data server on Arch Linux from my old blog:…