PRACTICAL STATECHARTS IN C/C EBOOK

Practical Statecharts in C/C++: Quantum Programming for Embedded Systems with CDROM , , Miro Samek, In , I wrote Practical Statecharts in C/C++: Quantum Programming for Embedded Systems (PSiCC), which was the first book to provide what had been missing thus far: a compact, efficient, and highly maintainable implementation of UML state machines in C and C++ with full support for hierarchical nesting of states. Practical statecharts in C/C++: quantum programming for embedded systems / Miro Samek. Bookmark: ; Physical.


PRACTICAL STATECHARTS IN C/C EBOOK

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PRACTICAL STATECHARTS IN C/C EBOOK


Practical UML Statecharts in C/C++, 2nd Edition

The accompanying website to this book contains complete open source code for QP, practical statecharts in c/c to popular processors and operating systems, including 80x86, ARM Cortex-M3, MSP, and Linux, as well as all examples described in the book.

I can simply hard-code the dimension right in the definition of an array, which is theonly place that I specify it. The function takes the following parameters: I like to keep the code and data of every active object strictly encapsulated within itsown C-file.

For example, all code and data for the active object Ship are encapsulated inthe file ship. The frameworkexecutes the application by calling your code, not the other practical statecharts in c/c around.

PRACTICAL STATECHARTS IN C/C EBOOK

In the DOS version of the www. In general, the decomposition of a problem into active objects is not trivial. As usualin any decomposition, your goal is to achieve possibly loose coupling among theactive object components ideally no sharing of any resourcesand you also strivefor minimizing the communication in terms of the frequency and size of exchangedevents.

I practical statecharts in c/c the simplest object-oriented technique ofidentifying objects, which is to pick the frequently used nouns in the problemspecification.

However,not every state machine in the system needs to be an active object with a separatetask context, an event queue, and a unique priority level practical statecharts in c/c, and merging them is a validoption when performance or space is needed.

As an example of this idea, Practical statecharts in c/c ended upmerging the Mines into the Tunnel active object, whereas I preserved the Mines asindependent state machine components of the Tunnel active object.

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The general design strategy for avoidingsharing of resources is to encapsulate each resource inside a dedicated active object andto practical statecharts in c/c that object manage the resource for the rest of the application.

That way, insteadof sharing the resource directly, the rest of the application shares the dedicatedactive object via events. So, for example, I decided to put the Tunnel active object in charge of the display.

With some understanding of the responsibilities and resource allocations to activeobjects I can move on to devising the various scenarios of event exchanges amongthe practical statecharts in c/c.

Perhaps the best instrument to aid the thinking process at this stage is theUML sequence diagram, such as the diagram depicted in Figure 1. The explanation sectionimmediately following the diagram illuminates the interesting points.

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Horizontally arranged boxesrepresent the various objects participating in the scenario, whereas heavy borders indicateactive objects. As usual in the UML, the object name is underlined. Time flows down thepage along the vertical dashed lines descending from the objects. Events are represented practical statecharts in c/c arrows originating from the sending object and terminating at the receiving object.

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Optionally, thin rectangles around instance lines indicate focus of control. I then use these labels in the left margin of the explanation section that immediatelyfollows the diagram.

PRACTICAL STATECHARTS IN C/C EBOOK

Occasionally, to unambiguously refer to a specific element of a partic-ular practical statecharts in c/c from sections of text other than the explanation section, I use the full referenceconsisting of the figure number followed by the label.

For example, Figure 1. This event is generated by the QF framework from the system time tick interrupt at a rate of 30 times per second, which is needed to drive a smooth animation of the display.

PRACTICAL STATECHARTS IN C/C EBOOK

The publish-subscribe event delivery in Practical statecharts in c/c is described in Chapter 6. First, Tunnel redraws the entire display from the current frame buffer. This action, performed 30 times per second, provides the illusion of animation of the display.

Next, the Tunnel clears the frame buffer and starts filling it up again for the next time frame. The Tunnel advances the tunnel walls by one step and copies the walls practical statecharts in c/c the frame buffer.

The parameters of this event are the current x, y coordinates of the Ship, which are the starting point for the Missile. This determination depends on the type of the Mine.