cyber-murmel

This is the gist of how to setup a NixOS server on a Hetzner Cloud instance with an admin user, ssh access and configuration management via git.

1. Create a Hetzner Cloud instance and click to enter it.
2. Stop the instance (top right corner icon).
3. Go to ISO Images.
4. Search for "nixos" and click mount.
5. Start the instance again (top right corner icon).
6. Open the console (top right corner icon).
7. Get the IP address by executing ip --brief --color address. The address can also be optained from the Hetzner Cloud web interface.

cyber-murmel

diff --git a/src/platforms/common/cdcacm.c b/src/platforms/common/cdcacm.c
index 399dd3d..d56d10e 100644
--- a/src/platforms/common/cdcacm.c
+++ b/src/platforms/common/cdcacm.c
@@ -451,12 +451,17 @@ static enum usbd_request_return_codes  cdcacm_control_request(usbd_device *dev,
 	case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
 		cdcacm_set_modem_state(dev, req->wIndex, true, true);
 		/* Ignore if not for GDB interface */
-		if(req->wIndex != GDB_IF_NO)
+		switch(req->wIndex) {

cyber-murmel

{config, pkgs, lib, ...}: {
  users.users.satisfactory = {
    home = "/var/lib/satisfactory";
    createHome = true;
  };

  nixpkgs.config.allowUnfree = true;

  systemd.services.satisfactory = {
    wantedBy = [ "multi-user.target" ];

cyber-murmel

OpenWRT supports the ESPRESSObin Ultra since 2020. Official builds are available.

In thins gist I want to explain how to install the image onto the board via a USB thumb drive.

All you need

• ESPRESSObin Ultra
• 12V 2A DC or PoE power supply
• USB A to USB Micro-B cable
• wired internet connection

cyber-murmel

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h> // compile with -lm

#define MASK(LEN) ((1<<LEN)-1)
#define GET_BITS(VAR, POS, NUM) ((VAR>>POS) & MASK(NUM))
#define GET_BIT(VAR, POS) GET_BITS(VAR, POS, 1)

cyber-murmel

EE & CE Resources

:::info This is a compiliation of useful links on the topic of electrical and computer engineering. This isnt' a comprehensive list. Feel free to add links to resources you found useful yourself.

:::

:::info

cyber-murmel

{ pkgs ? import <nixpkgs> {} }:

let
  fixWrapper = pkgs.runCommand "fix-wrapper" {} ''
    mkdir -p $out/bin
    for i in ${pkgs.gcc.cc}/bin/*-gnu-gcc*; do
      ln -s ${pkgs.gcc}/bin/gcc $out/bin/$(basename "$i")
    done
    for i in ${pkgs.gcc.cc}/bin/*-gnu-{g++,c++}*; do
      ln -s ${pkgs.gcc}/bin/g++ $out/bin/$(basename "$i")

cyber-murmel

Recursive File Integrity Checking using openssl dgst

Checksumming

Use find to iterate trought all subdirectories of the given path (./). openssl dgst -sha256 each file in each directory and add the output to the SHA256 file in the corresponding directory.

find ./ -type d -exec sh -c 'cd "{}"; find ./ -maxdepth 1 -type f -not -name SHA256 -exec openssl dgst -sha256 \{\} + | sort -u | tee SHA256' \;

Checking

cyber-murmel

# each datamatrix size can fit as many numbers as according to the following dict
# a non-number letter needs double as much space as a number
# an emoji need 16x as much space as a number 😂
size_capacity_maps = {
    'square':   {
         '10x10':     6,   '12x12':   10,   '14x14':   16,   '16x16':   24,
         '18x18':    36,   '20x20':   44,   '22x22':   60,   '24x24':   72,
         '26x26':    88,   '32x32':  124,   '36x36':  172,   '40x40':  228,
         '44x44':   288,   '48x48':  348,   '52x52':  408,   '64x64':  560,
         '72x72':   736,   '80x80':  912,   '88x88': 1152,   '96x96': 1392,

cyber-murmel

# -*- coding: utf-8 -*-

# Copyright 2020 by https://badge.team/
# This file is released under the "CC0 1.0 Universal" license.
# https://creativecommons.org/publicdomain/zero/1.0/legalcode

from machine import Pin, SPI

# Pins
pin_reset = Pin(16, Pin.OUT)