DavidEGrayson

// This is a small C program that tests your version of vsnprintf to see if it is
// compliant with the C99 standard.
//
// The script gives successful results (compliant vsnprintf) on these environments:
// - MSYS2's MINGW64 environment (GCC 13.2.0)
//
// I also expect successful results on Linux, macOS and modern UCRT-based environments
// provided by Microsoft.
//
// From the MSDN documentation of vsnprintf:

DavidEGrayson

ffprobe foo.mp4   # Make sure the audio stream is aac.
ffmpeg -i foo.mp4 -vn -acodec copy foo.aac
ffmpeg -i foo.aac -acodec pcm_s16le foo.wav
# Edit foo.wav with audacity, save to foo_edited.wav.
ffmpeg -i foo_edited.wav -acodec aac foo_edited.aac
ffmpeg -i foo.mp4 -codec copy -an foo_silent.mp4
ffmpeg -i foo_silent.mp4  -i foo_edited.aac -shortest -c:v copy -c:a aac foo_edited.mp4

# Reduce file size and remove sounds
ffmpeg -i foo.mp4 -vcodec libx264 -crf 28 -an foo_out.mp4

DavidEGrayson

This is an opinionated tutorial that shows you how to set up a development environment for the RP2040 on Windows using only open source tools. You should start at the beginning of this tutorial, but you don't have to follow ALL of the instructions: you can stop after completing any level and leave with something that is useful.

Level 0: Set up MSYS2

Download and install [MSYS2], the best system for developing open source software on Windows.

Use "Edit environment variables for your account" in the Windows Control Panel to add an environment variable for your user named HOME with a value like C:\Users\david (but with david replaced by your actual Windows user name). Do NOT add an extra slash on the end. MSYS2 uses this variable to determine where your home directory is. If you don't set it, MSYS2 defaults to using a home directory like /home/USERNAME which actually lives inside the MSYS2 installation. That is not your true home directory, and you shouldn't get in the habit of storing files t

DavidEGrayson

// Lots of code was copied from https://msdn.microsoft.com/en-us/library/ff802693.aspx#serial_topic3

#include <assert.h>
#include <windows.h>
#include <stdio.h>
#include <stdbool.h>

void ReportStatusEvent(HANDLE port, DWORD s)
{
    printf("event 0x%lx", s);

DavidEGrayson

Submodule URL

There are three locations where git keeps track of submodule URL:

1. .gitmodules - This is a regular file that is committed in the repository.
2. .git/config
3. .git/modules/somepath/config

These commands have an effect on the three URLs:

DavidEGrayson

map = ['']
instructions = []
File.foreach('input.txt') do |line|
  md = line.match(/\d/)
  if md
    line.scan(/(\d+|R|L)/) do |m|
      if 'LR'.include?(m[0])
        instructions << m[0].to_sym
      else
        instructions << m[0].to_i

DavidEGrayson

$input = {}
File.foreach('input.txt') do |line|
  if md = line.match(/(\w+): (\d+)/)
    $input[md[1].to_sym] = md[2].to_i
  elsif md = line.match(/(\w+): (\w+) (.) (\w+)/)
    $input[md[1].to_sym] = [md[3].to_sym, md[2].to_sym, md[4].to_sym]
  else
    $stderr.puts "Unrecognized line: #{line}"
    exit 1
  end

DavidEGrayson

$width = 1000
$height = 200
$world = (' ' * $width + "\n") * $height

def coords_in_bounds?(coords)
  (0...$width).include?(coords[0]) && (0...$height).include?(coords[1])
end

def read(coords)
  raise if !coords_in_bounds?(coords)

DavidEGrayson

• NOTE: The more standard way to build midipix these days is to use this shell script that someone else made https://github.com/lalbornoz/midipix_build
• NOTE: I have started working on PKGBUILDs here: https://github.com/DavidEGrayson/midipix-packages

Getting started with midipix

Let's compile midipix from source and play with it!

1. Get access to a Linux machine for development.
2. Install git and gcc on the development machine.

DavidEGrayson

#!/usr/bin/ruby
# Takes a command line for GCC (or similar) on as a file or on its
# standard input, extracts the preprocessor macros defined and the
# include paths, and outputs them in a format suitable for
# pasting into c_cpp_properties.json so that VSCode can understand
# your C/C++ project better.

require 'json'

input = ARGF.read