Embedded software development : the open-source approach by Ivan Cibrario Bertolotti, Tingting Hu

By Ivan Cibrario Bertolotti, Tingting Hu

Embedded software program improvement: The Open-Source Approach supplies a pragmatic advent to embedded software program improvement, with a spotlight on open-source parts. This programmer-centric booklet is written in a fashion that allows even amateur practitioners to understand the advance approach as a whole.

Incorporating actual code fragments and specific, real-world open-source working process references (in specific, FreeRTOS) all through, the text:

  • Defines the function and objective of embedded structures, describing their inner constitution and interfacing with software program improvement tools
  • Examines the interior workings of the GNU compiler assortment (GCC)-based software program improvement approach or, in different phrases, toolchain
  • Presents software program execution versions that may be followed profitably to version and show concurrency
  • Addresses the fundamental nomenclature, types, and ideas regarding task-based scheduling algorithms
  • Shows how an open-source protocol stack might be built-in in an embedded approach and interfaced with different software program components
  • Analyzes the most parts of the FreeRTOS software Programming Interface (API), detailing the implementation of key working method concepts
  • Discusses complex subject matters resembling formal verification, version checking, runtime exams, reminiscence corruption, defense, and dependability

Embedded software program improvement: The Open-Source Approach capitalizes at the authors’ wide learn on real-time working structures and communications utilized in embedded purposes, usually performed in strict cooperation with undefined. hence, the booklet serves as a springboard for additional research.

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This also explains why jitter is generally more of concern. Several of these important aspects of software development will be considered in more detail in Chapter 12, within the context of a real-world example. As we can see, in several circumstances, embedded systems also have rather tight dependability requirements that, if not met, could easily lead to safety issues, which is another big concern in some kinds of embedded systems. Safety is not only about the functional correctness (including the timing aspect) of a system but also related to the security aspect of a system, especially since embedded systems nowadays are also network-based and an insecure system is often bound to be unsafe.

The main purpose of this chapter is to outline those differences and explain how they affect programmers’ activities and way of working. In turn, this puts the focus on how to make the best possible use of the limited resources available in an embedded system by means of code optimization. As outlined above, this topic is of more importance in embedded software development with respect to general-purpose development, because resource constraints are usually stronger in the first case. Moreover, most embedded systems have to deal with real-world events, for instance, continuously changing environmental parameters, user commands, and others.

In this case, the cache controller performs two distinct actions: a. It selects an empty cache line. If the cache is completely full, this may entail storing the contents of a full cache line back into memory, an operation known as eviction. b. The cache line is filled with the data block that surrounds the address targeted by the processor in the current transaction. In the second case, the transaction requested by the processor finishes only after the cache controller has completed both actions outlined previously.

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