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 world book serviceProgramming Embedded Systems, Second Edition with C Though prognostications are difficult, it is absolutely clear that consumers will continue to demand everbrainier products requiring more microprocessors and huge increases in the corresponding software. Estimates suggest that the firmware content of most products doubles every 10 to 24 months. While the demand for more code is increasing, our productivity rates creep up only slowly. So it's also clear that the industry will need more embedded systems people in order to meet the demand. What skills will these people need? In the PC world, one must be a competent C/C++ programmer. But embedded developers must have a deep understanding of both the programming languages and the hardware itself; no one can design, code, and test an interrupt service routine, for instance, without knowing where the interrupts come from, how the hardware prioritizes them, the tricks behind servicing that hardware, and machine-level details about saving and preserving the system's context. A firmware developer must have detailed insight into the hardware implementation of his system's peripherals before he can write a single line of driver code. In the PC world, the magic of the hardware is hidden behind an extensive API. In an embedded system, that API is always written by the engineers that are developing the product. In this book, Michael Barr and Anthony Massa show how the software and hardware form a synergistic gestalt. They don't shy away from the intricacies of interrupts and I/O, or priority inversion and mutexes. The authors appropriately demonstrate building embedded systems using a variety of open source tools, including the GNU compiler suite, which is a standard tool widely used in this industry. eCos and Linux, both free/open source products, are used to demonstrate small and large operating systems. The original version of this book used an x86 target board, which has been replaced in this edition by an ARM-based product. Coincidently, as this volume was in production, Intel made an end-of-life announcement for all of its embedded x86 processors. Readers can be assured that the ARM will be around for a very long time, as it's supported by an enormous infrastructure of vendors. The hardware is inexpensive and easily available; the software is free. Together they represent the mainstream of embedded systems development. Readers can be sure they'll use these tools in the future. Buy the development kit, read the book, and execute the examples. You'll get the hands-on experience that employers demand: building and working with real embedded applications.






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