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An Example of Linux Kernel Module using GPIO Subsystem

This is a kernel module, with DT Overlay, to illustrate usage of GPIO subsystem in Linux kernel.

Hardware Envoronment

1. Raspberry Pi 3 Model B Rev 1.2
2. Arduino UNO

Software Environment

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Mounting VirtualBox shared folders on Ubuntu Server 18.04 LTS (Bionic Beaver)

This guide will walk you through the steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest.

Prerequisites

This guide assumes that you are using the following setup:

• Oracle VM VirtualBox version 6.0.10 with Extension Pack installed
• Microsoft Windows 7 SP1 as the host OS
• A fresh install of Ubuntu Server 18.04.2 LTS as the guest OS

You could still make this guide work with other setups (possibly with some modifications to the commands and whatnot).

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/* 
 * A simple, non-optimizing brainfuck to C translator.
 * 2010-08-31 - Version 1.0   (Cory Burgett)
 *
 * This code is hereby placed into the public domain.
 *
 * Originally located at: http://www4.ncsu.edu/~cmburget/brainfucc.c
 */

#include <stdio.h>

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ELEMENT_TABLE = {'C':12.011, 'O':15.999, 'H':1.008, 'N':14.007, 'Cl':35.45, 'Br':79.904, 'K':39.098, 'S':32.06}
def molar_mass(name, elements=ELEMENT_TABLE):
    buf = ''
    digit = ''
    molar_mass = 0.0 
    for i in range(len(name)):
        c = name[i]
        nxt = ''
        if not (i == len(name) - 1): 
            nxt = name[i + 1]

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" size of a hard tabstop
set tabstop=4

" always uses spaces instead of tab characters
set expandtab

" size of an "indent"
set shiftwidth=4

" recursively find tags

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#
# Automatically generated file; DO NOT EDIT.
# Buildroot 2019.05-git-00959-gd54b0e22ae Configuration
#
BR2_HAVE_DOT_CONFIG=y
BR2_HOST_GCC_AT_LEAST_4_5=y
BR2_HOST_GCC_AT_LEAST_4_6=y
BR2_HOST_GCC_AT_LEAST_4_7=y
BR2_HOST_GCC_AT_LEAST_4_8=y
BR2_HOST_GCC_AT_LEAST_4_9=y

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#
# Automatically generated file; DO NOT EDIT.
# Linux/x86_64 5.0.10 Kernel Configuration
#

#
# Compiler: x86_64-buildroot-linux-gnu-gcc.br_real (Buildroot 2019.05-git-00959-gd54b0e22ae) 7.4.0
#
CONFIG_CC_IS_GCC=y
CONFIG_GCC_VERSION=70400

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from scipy import signal
import matplotlib.pyplot as plt
import math
import numpy as np
plt.rc('text', usetex=True)
W_RANGE = np.arange(-4, 6, 0.001).tolist()
W_RANGE = [10**i for i in W_RANGE]

def plot_bode(sys, legend, tittle = ''):
    fig, axs = plt.subplots(2, 1, constrained_layout=True)

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(defun c:LEGO ( / name)
    (if (setq name (getstring "Enter component Name (Brick/Plate/round_brick/round_plate)"))
        (if (or (eq name "plate") (eq name "P"))(draw_plate)
        (if (or (eq name "brick") (eq name "B"))(draw_brick)
        (if (or (eq name "round_plate") (eq name "RP"))(draw_round_plate)
        (if (or (eq name "round_cone") (eq name "RC"))(draw_round_cone)
        (if (or (eq name "round_brick") (eq name "RB"))(draw_round_brick))))))
    );end if
)

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#! /bin/bash
# install print history plugin. See
# https://plugins.octoprint.org/plugins/printhistory/
pip install "https://github.com/imrahil/OctoPrint-PrintHistory/archive/master.zip"

# install print statistics plugin. See
# https://plugins.octoprint.org/plugins/stats/
pip install "https://github.com/amsbr/OctoPrint-Stats/archive/master.zip"

# install zoomable temperature graph. See