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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Introduction to Embedded Systems

Definition:
The Combination of Software and Hardware in which the software controls the entire hardware for a dedicated application.

Components of an Embedded Systems
* Power Supply and Reset circuit
* Timer
* Watch Dog Timer or WDT
* Processor
* Memory
RAM Which stores the data (data Memory)
ROM Which stores the Program (Program Memory)
* Interrupt controllers
* IO Ports
* UART for Serial communication
* Parallel ports

Classification of Embedded Systems

Small Scale Embedded Systems
* Uses 8 or 16 bit microcontrollers
* Software and harware complexity is very less
* uses C as a programming language
* The codes are cross compiled and stored in the system memory.
* They sometimes may be battery operated.
Example processors : Intel 8051, Microchip PIC16f8X, Motorola 68HC05,08

Medium Scale Embedded Systems
* Uses 16 or 32 bit controllers or sometime uses DSPs(Digital Signal Processors) or RISC (Reduced Instruction Set Processors)
* They have great complexity.
* They use a Real Time Operating Systems (RTOS), SImulators, Debuggers, emulators, and IDE to develop all these functionalities.
Example: Intel 8051, 80251,80196 Motorola 68HCX11,12

Large Scale Embedded Systems
* They use 32 bit processors.
* They use CPLDs or FPGAs or ASICs
* They are System on Chip Controllers
* They go from initial design like co design and co analysis and co verification
* The Processing speeds are very high in these systems.
* They sometime may be proprietary systems in which the development tools may not be available at all.
Example: ARM7, IBM Power PC

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