JAVA-BASED REAL-TIME PROGRAMMING

2. Fundamentals
as expressed in the source code should result in the same correct result
independent of the underlying scheduler or operating system.
• Correctness from a real-time point of view; the timing requirements are
considered so that control output is computed in time.
• Proper object oriented design and implementation; we use the established
principles of object orientation to improve structure, readability,
maintainability, etc. of embedded software.
• Appropriate trade-off between active and passive objects; the thread
class should be used where appropriate but not too excessive for efficiency
and readability reasons.
• Proper protection of shared resources; the concepts of semaphores, synchronized
methods, and messages (events) should be used appropriately.
Since software development tends to take a bigger and bigger part of system
development resources, it is very important that we are able to handle the
above items. In a wider perspective, there are different approaches to development
of embedded systems. The focus could be on hardware, control
theory, and/or software issues. All of these focuses are important for industrial
development of control systems. Here we approach the development of
embedded software from a programming point of view, leaving the rest (like
selection of computing and IO hardware, discretizing control algorithms, etc.)
for other books.
40 2012-08-29 16:05