How to use VSCODE remote debuging on a raspberry pi 3 without OS crashes

You will often encounter OS crashes when using VSCODE on a rpi3 for debugging. The cause: memory overflow and too low swap size. If you set the swap memory to 1024MB you will have solved the problem.

Follow these steps (source ->

1. Temporarily Stop Swap:

sudo dphys-swapfile swapoff

2. Modify the size of the swap

As root, edit the file /etc/dphys-swapfile and modify the variable CONF_SWAPSIZE to 1024:


Using a command such as:

sudo nano /etc/dphys-swapfile

3. Initialize Swap File

sudo dphys-swapfile setup

4. Start Swap

sudo dphys-swapfile swapo

Hvordan kompilere eldre .NET / C# prosjekter fra Visual Studio i VSCODE (notes to self)

Må ha support for C# utvikling installert i VSCODE. Hvis det er et eldre prosjekt som man henter opp som er laget i Visual Studio så må man ha C# Dev kit installert siden det støtter MSBUILD projects osv.


Må sjekke at ikke det er feil versjon av dotnet som kjøres med kommando dotnet --info
Installering i et CMD vindu kan skje med winget:


X86 path kan være fær X64 path. Rekkefølgen på path prioriteres
Sjekk PATH ! IKke bare PATH for ALLE brukere, men sjekk path for DIN bruker MRK denne tutorialen fokuserer på SYSTEM PATH men det var YOUR ACCOUNT PATH som var feil 
Hvis path peker til x86 versjonen av dotnet mens du har installert dev packs osv for X64 versjonen av dotnet så får du feilmeldinger i VSCODE
Må ha core dev installert
List hva som er installert med "dotnet --list-sdks" 


Må modde .csproj fila i det opprinnelige prosjektet for å få kopmpilert med VSCODE

<Project Sdk="Microsoft.NET.Sdk">


    <PackageReference Include="System.Resources.Extensions" Version="5.0.0" />



Måtte konvertere .csprj fila til nytt format som VSCODE ville godta (fikk build feilmelding) 
Brukte dette toolet på kommandolinje:,/programming/2019/02/18/ConvertingCsProjectsToNewSdkFormat.html

dotnet tool install --global Project2015To2017.Migrate2017.Tool
conv HelloWorld.csproj

Litt mer info om konvertering til nytt CSPROJ format:

How to convert binary fractions to decimal ( fixed point arithmetics )

Example for n = 110.101

Step 1: Conversion of 110 to decimal
=> 1102 = (1*22) + (1*21) + (0*20)
=> 1102 = 4 + 2 + 0
=> 1102 = 6
So equivalent decimal of binary integral is 6.

Step 2: Conversion of .101 to decimal
=> 0.1012 = (1*1/2) + (0*1/22) + (1*1/23)
=> 0.1012 = 1*0.5 + 0*0.25 + 1*0.125
=> 0.1012 = 0.625
So equivalent decimal of binary fractional is 0.625

Step 3: Add result of step 1 and 2.
=> 6 + 0.625 = 6.625
Example for n = 4.47 k = 3

Step 1: Conversion of 4 to binary
1. 4/2 : Remainder = 0 : Quotient = 2
2. 2/2 : Remainder = 0 : Quotient = 1
3. 1/2 : Remainder = 1 : Quotient = 0

So equivalent binary of integral part of decimal is 100.

Step 2: Conversion of .47 to binary
1. 0.47 * 2 = 0.94, Integral part: 0
2. 0.94 * 2 = 1.88, Integral part: 1
3. 0.88 * 2 = 1.76, Integral part: 1

So equivalent binary of fractional part of decimal is .011

Step 3: Combined the result of step 1 and 2.

Final answer can be written as:
100 + .011 = 100.011

RTOS on Arduino

FreeRTOS Task for Blink LED in Arduino UNOProfessional software developers of time critical code often use a real time operating system (RTOS) in their work. The reason is that the OS is taking care of timing and scheduling tasks with higher priority. Now you can easily use an RTOS on your Arduino as well! Read Jain Risbah’s article over at circuitdigest:

How to check for a NAN (Not A Number) in C++ in embedded systems without exception handlers

Sometimes there are bugs or special corner conditions that makes a NAN (Not A Number) occur in code compiled from a C++ source and executed on an embedded systems without memory to run exception handlers.

Here is what @Jalf writes over at StackExchange:

According to the IEEE standard, NaN values have the odd property that comparisons involving them are always false. That is, for a float f, f != f will be true only if f is NaN.

Note that, as some comments below have pointed out, not all compilers respect this when optimizing code.

For any compiler which claims to use IEEE floating point, this trick should work.

If you inplement a function in a separate .cpp file , how do you access objects instantiated in main from functions implemented that file?

Sometimes there is a need to spread code into several .cpp files to avoid clutter (for example main.cpp, other1.cpp, other 2.cpp) . So if you implement a function in a separate .cpp file, how do you access objects instantiated in main?

Solution: use extern


extern ObjectType objectname

void doSomething (void) 

Of course this is very basic stuff, but many new programmers ask about this so I included a short post about this here.

How to develop and debug C++ code for Arduino in Visual Studio if you are tired of the Arduino IDE

The Arduino platform has gained a fantastic popularity over the past ten years. For small quick and dirty projects, the .ino files and the standard IDE is OK. However, for professional development projects and for developers that want control over the .hpp and .cpp files the standard Arduino IDE is somewhat regarded like a toy. Furthermore there is no proper debugger in the Arduino IDE  (whaaat?, you gotta be kidding?)

Well, this has changed as Visual Micro has developed a plugin to Microsoft Visual Studio. You can write code the normal way you do it with .cpp and .hpp files. You can also run the GDB debugger. The IDE has support for the regular .INO files and Arduino libraries. Here is how both .cpp and .ino files are handled:

There is a free version of Visual Micro and it works against the free versions of Microsoft Visual Studio 2017 Community Edition. All you need is a Microsoft account to be able to download and install Visual Studio 2017 Community edition. Then in MSVC 2017, go to tools, Extensions and Updates and enter a search for Arduino in the search bar. It will will offer to automatically install the Arduino tools and the GDB debugger. Click install and you are on the right path.


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