Valentyn Yukhymenko BaLiKfromUA

Here is the best setup (I think so :D) for K-series Keychron keyboards on Linux.

Note: many newer Keychron keyboards use QMK as firmware and most tips here do not apply to them. Maybe the ones related to Bluetooth can be useful, but everything related to Apple's keyboard module (hid_apple) on Linux, won't work. As far as I know, all QMK-based boards use the hid_generic module instead. Examples of QMK-based boards are: Q, Q-Pro, V, K-Pro, etc.

Most of these commands have been tested on Ubuntu 20.04 and should also work on most Debian-based distributions. If a command happens not to work for you, take a look in the comment section.

Make Fn + F-keys work (NOT FOR QMK-BASED BOARDS)

Older Keychron keyboards (those not based on QMK) use the hid_apple driver on Linux, even in the Windows/Android mode, both in Bluetooth and Wired modes.

Getting started with Linux kernel development

Prerequisites

The Linux kernel is written in C, so you should have at least a basic understanding of C before diving into kernel work. You don't need expert level C knowledge, since you can always pick some things up underway, but it certainly helps to know the language and to have written some userspace C programs already.

It will also help to be a Linux user. If you have never used Linux before, it's probably a good idea to download a distro and get comfortable with it before you start doing kernel work.

Lastly, knowing git is not actually required, but can really help you (since you can dig through changelogs and search for information you'll need). At a minimum you should probably be able to clone the git repository to a local directory.

Многопоточность в Java

Данный гист содержит основную информацию, которую нужно знать о Java Standart Edition.

STM32duino GPIO Registers and Programming

Bit Setting in C

Setting a bit

Use the bitwise OR operator ( | ) to set a bit.

number |= 1 << x;

LLVM on the high level could be separated into:

1. Core (operations which work on the LLVM IR AST)
1. Optimisers
1. Backends/targets - these generate the instructions for a given CPU (i.e. x86, ARM, WebAssembly, etc.)

There are many projects creating frontends for LLVM, which are actual compilers outputting LLVM IR.

Some of these include:

clang (C and C++)
llgo (Go)

How to fix missing `ZLIB_LIBRARY` and `ZLIB_INCLUDE_DIR` cmake error on Windows

Install ZLIB

Download ZLIB for Windows from Sourceforge and install it on your Windows machine. Works with x86/x64

Find ZLIB install directory

Currently, the ZLIB installer from Sourceforge (above) installs in C:/Program Files (x86)/GnuWin32.

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	TADA, it’s `hexdump -v -e '64/1 "%02x" "\n"' < /dev/hidraw3`

	No idea what the first byte is… but I’m going to assume its for device ID for the many users that are connected, but it probably has to be set by the connected machine?

	01ff777f7f0800aa0000435dfdf1ff14000200c5ff0721150300000000001b000001fc9133a32990880428008000000080000000008000000080000000008000
	↑↑↑↑
	left stick, value, first field is horz (00 left), second field is vertical (00 top)

	017f80ff61080064000059f2fdfffffbff0e00d107081e9bf600000000001b0000018e94b1b00690880428008000000080000000008000000080000000008000
	↑↑↑↑