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Embedded systems are where the software meets the physical world. As we put tiny computers into all sorts of systems (door locks, airplanes, pacemakers), how we implement the software is truly, terrifyingly important. Writing software for these things is more difficult than computer software because the systems have so few resources.
Designing an efficient software on top of such limited resources is indeed a challanging task.
The purpose of these tutorial is to accelerate your learning process and give you solid understanding of embedded system basics.