vim and ctags

Jump to tag under cursor: CTRL-]

Jump back: CTRL-o or CTRL-t

Show tag in split preview window, don't move cursor: CTRL-w }

Close preview window: CTRL-w z

Show tag in split preview window, move cursor to preview windows: CTRL-w ]

Close preview window: CTRL-w c

Go to definition of word under cursor in current function: gd

Go to definition in current file: gD

Installing SystemC

wget http://accellera.org/images/downloads/standards/systemc/systemc-2.3.1a.tar.gz
tar xvfz systemc-2.3.1a.tar.gz
cd systemc-2.3.1a/
mkdir objdir
cd objdir/
../configure --prefix=/usr/local/systemc-2.3.1
make
make check
sudo make install

Enable serial console on Raspberry Pi 3

echo enable_uart=1 >>/boot/config.txt

Using Android Studio with IBus version < 1.5.11

IDEA-78860: Keyboard input sometimes is blocked when IBus is active

export IBUS_ENABLE_SYNC_MODE=1

Orange Pi One

Allwinner A31 and Allwinner H3 SoC baremetal application
Open firmware for Allwinner H3 SoC
https://github.com/megous/h3-ar100-firmware-decompiler
http://www.orangepi.org/orangepione/
Installing Debian on Allwinner
armbian - Linux for ARM development boards

Installing Coq on Ubuntu 14.04

wget https://coq.inria.fr/distrib/V8.6/files/coq-8.6.tar.gz
tar xzf coq-8.6.tar.gz && cd cd coq-8.6
sudo apt-get install ocaml ocaml-findlib camlp5 liblablgtk2-ocaml-dev liblablgtksourceview2-ocaml-dev
./configure && make world && sudo make install && sudo make clean-ide

coqtop # Coq toplevel
coqc   # Coq compiler
coqide # Coq IDE

NetBSD on Raspberry Pi 2

NetBSD/evbarm on Raspberry Pi
How to get NetBSD
The NetBSD Guide
NetBSD Internals
NetBSD Documentation: Kernel
NetBSD Documentation: Kernel Programming FAQ
NetBSD Device Driver Writing Guide
NetBSD Documentation: Writing a pseudo device

Crosscompiling NetBSD on Linux:

mkdir netbsd-src && cd netbsd-src
wget http://cdn.netbsd.org/pub/NetBSD/NetBSD-7.1/source/sets/gnusrc.tgz
wget http://cdn.netbsd.org/pub/NetBSD/NetBSD-7.1/source/sets/sharesrc.tgz
wget http://cdn.netbsd.org/pub/NetBSD/NetBSD-7.1/source/sets/src.tgz
wget http://cdn.netbsd.org/pub/NetBSD/NetBSD-7.1/source/sets/syssrc.tgz
wget http://cdn.netbsd.org/pub/NetBSD/NetBSD-7.1/source/sets/xsrc.tgz
for f in *.tgz; do tar xfz $f; done
cd /usr/src && ./build.sh -U -u -m evbarm -a earmv7hf release
sudo sh -c 'zcat obj/releasedir/evbarm/binary/gzimg/armv7.img.gz |dd bs=4M of=/dev/mmcblk0'

Zybo

Zynq internal temperature sensor:

cat /sys/devices/amba.0/f8007100.ps7-xadc/temp

stdint.h, inttypes.h

<stdint.h>: intptr_t, uintptr_t
<inttypes.h>

GitHub syntax highlighting

https://github.com/github/linguist/blob/master/lib/linguist/languages.yml

Apache

SSI modification time: 
SSI remote IP: 
SSI execute CGI: 
htaccess remove CGI handler: RemoveHandler .pl

RTL-SDR

Determining frequency offset:

git clone https://github.com/asdil12/kalibrate-rtl.git
cd kalibrate-rtl && ./bootstrap && ./configure && make

src/kal -s GSM900:

Found 1 device(s):
  0:  Generic RTL2832U

Using device 0: Generic RTL2832U
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Scanning for GSM-900 base stations.
GSM-900:
	chan: 2 (935.4MHz - 5.411kHz)	power: 83509.38
	chan: 41 (943.2MHz - 5.213kHz)	power: 37202.89
	chan: 57 (946.4MHz - 5.122kHz)	power: 31001.38
	chan: 85 (952.0MHz - 5.204kHz)	power: 40837.42

src/kal -c 2:

Found 1 device(s):
  0:  Generic RTL2832U

Using device 0: Generic RTL2832U
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Calculating clock frequency offset.
Using GSM-900 channel 2 (935.4MHz)
average		[min, max]	(range, stddev)
- 4.616kHz		[-4646, -4582]	(64, 16.380167)
overruns: 0
not found: 0
average absolute error: 4.935 ppm

POCSAG

git clone https://github.com/EliasOenal/multimon-ng.git
cd multimon-ng && mkdir build && cd build
cmake ..
make

gqrx & # Frequency: 466.075 MHz, Narrow FM, Bandwidth ~ 15 kHz, Stream Audio to UDP

nc -l -u -p 7355 |
    sox -t raw -esigned-integer -b 16 -r 48000 - -esigned-integer -b 16 -r 22050 -t raw - |
    ./multimon-ng -t raw -a POCSAG512 -a POCSAG1200 -a POCSAG2400  -f alpha -

ADS-B

sudo apt-get install librtlsdr-dev
git clone https://github.com/antirez/dump1090.git
cd dump1090 && make

./dump1090 --interactive --net

# Web interface (map):  http://localhost:8080

ACARS

Frequencies: https://www.acarsd.org/ACARS_frequencies.html

git clone https://github.com/TLeconte/acarsdec.git
cd acarsdec && make -f Makefile.rtl

./acarsdec -r 0 131.525 131.550 131.725 p 5 # 131.{525,550,725} MHz, frequency offset 5 ppm

ACARS message labels: http://acarsonline.pbworks.com/w/page/1286730/Message%20Labels

LaTeX listings package: syntax highlighting for SPICE netlists

\usepackage{listings}

% Listings package language definition for SPICE netlists
\lstdefinelanguage{SPICE}
{
	% SPICE commands
	morekeywords={
		% Control statements
		.op,
		.dc,
		.ac,
		.tran,
		.ic,
		.if,
		.nodeset,
		.temp,
		.param,
		.step,
		% Output statements
		.print,
		.plot,
		.option,
		.options,
		.measure,
		.meas,
		% Misc
		.include,
		.end,
		.subckt,
		.ends,
		.global
	},
	alsoletter = {.},
	% Keywords are not case sensitive
	sensitive = false,
	% Comments
	morecomment = [f][\em\color{gray}][0]{*},
	morecomment = [l]{;} % LTSpice extension
}
\lstset{
	language     = SPICE,
	basicstyle   = \footnotesize\ttfamily, % Global font
	captionpos   = b,               % Place caption at the bottom
	tabsize      = 4,               % Tab equals four spaces
	columns      = fixed,           % Same width for all characters
	keepspaces   = true,            % Leave spaces as is
	breaklines   = true,            % Wrap long lines
	numbers      = left,            % Linenumbers on the left
	numberstyle  = \tiny\ttfamily,  % Font for numbers
	commentstyle = \em\color{gray}, % Font for comments
	keywordstyle = \bfseries,       % Font for keywords
}

LaTeX: undertilde package (for matrix notation)

Installation:

wget http://mirrors.ctan.org/macros/latex/contrib/undertilde/undertilde.dtx
wget http://mirrors.ctan.org/macros/latex/contrib/undertilde/undertilde.ins
latex undertilde.ins # generate "undertilde.sty"

Usage:

\usepackage{undertilde}

...

\[
	\underline{\dot{x}}(t) = \utilde{A}\cdot\underline{x}(t) + \underline{b}\cdot u(t)
\]

LaTeX

Size of brackets (parentheses)

Manually adjust size of parentheses: \big, \Big, \bigg and \Bigg

epstopdf error due to missing "helvetic" package

Error message:

$ epstopdf.exe XXX.eps
Error: /invalidfont in /findfont
Operand stack:
   Helvetica-Oblique
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   2015   1   3   %oparray_pop   2014   1   3   %oparray_pop   --nostringval--   1998   1   3   %oparray_pop   1884   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   1967   1   3   %oparray_pop
Dictionary stack:
   --dict:973/1684(ro)(G)--   --dict:0/20(G)--   --dict:123/200(L)--
Current allocation mode is local
Last OS error: No such file or directory
MiKTeX GPL Ghostscript 9.25: Unrecoverable error, exit code 1

Sorry, but "MiKTeX EPS-to-PDF Converter" did not succeed.

The log file hopefully contains the information to get MiKTeX going again:

  C:\Users\matth\AppData\Local\MiKTeX\2.9\miktex\log\epstopdf.log

Solution: install the "helvetic" package using the MiKTeX Console

Acronyms using the "glossary" package

Package:

\usepackage[acronym]{glossaries}
\makeglossaries

Defining new acronyms:

\newacronym{fft}{FFT}{Fast Fourier Transform}

Using the full version + abbreviation:

\acrfull{fft}

Short version:

\acrshort{fft}

Full version:

\acrlong{fft}

Printing the list of acronyms in the document:

\printglossary[type=\acronymtype]

Compiling the glossary in TeXworks:

Install Strawberry Perl for Windows: http://strawberryperl.com/
TeXworks Preferences -> Processing Tools -> makeglosseries
Program: "makeglossaries", Arguments: "$basename"

SSH

Unable to negotiate with 10.0.0.1 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1

.ssh/config:

KeepAlive yes
ServerAliveInterval 60

Host 10.0.0.1 10.1
    KexAlgorithms +diffie-hellman-group1-sha1

Windows 10: delete all partitions on USB flash drive including EFI partitions

diskpart
list disk
select disk XX
clean

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

NOTES.md

NOTES.md

vim and ctags

Installing SystemC

Enable serial console on Raspberry Pi 3

Using Android Studio with IBus version < 1.5.11

Orange Pi One

Installing Coq on Ubuntu 14.04

NetBSD on Raspberry Pi 2

Zybo

stdint.h, inttypes.h

GitHub syntax highlighting

Apache

RTL-SDR

POCSAG

ADS-B

ACARS

LaTeX listings package: syntax highlighting for SPICE netlists

LaTeX: undertilde package (for matrix notation)

LaTeX

Size of brackets (parentheses)

epstopdf error due to missing "helvetic" package

Acronyms using the "glossary" package

SSH

Windows 10: delete all partitions on USB flash drive including EFI partitions

Files

NOTES.md

Latest commit

History

NOTES.md

File metadata and controls

vim and ctags

Installing SystemC

Enable serial console on Raspberry Pi 3

Using Android Studio with IBus version < 1.5.11

Orange Pi One

Installing Coq on Ubuntu 14.04

NetBSD on Raspberry Pi 2

Zybo

stdint.h, inttypes.h

GitHub syntax highlighting

Apache

RTL-SDR

POCSAG

ADS-B

ACARS

LaTeX listings package: syntax highlighting for SPICE netlists

LaTeX: undertilde package (for matrix notation)

LaTeX

Size of brackets (parentheses)

epstopdf error due to missing "helvetic" package

Acronyms using the "glossary" package

SSH

Windows 10: delete all partitions on USB flash drive including EFI partitions