TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 202

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 202', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1 Specifically it represents the number of clock ticks remaining after all of the timers ahead of it in the list have expired. 2 Astute readers might recall that in Chapter 5 I stated that the PCB was located in the I O space of the 80188EB processor. However because memory-mapped registers are more likely in a device driver situation I ve relocated the entire PCB to physical address 72000h in the memory space. This new location will be assumed for the rest of the book. To see how this relocation was performed take a look at the constructor for the i8018xEB class. 3 A word of caution about waitfor this implementation spins its wheels waiting for the software timer to change to the done state. This technique is called busywaiting and it is neither elegant nor an efficient use of the processor. In Chapter 8 we ll see how the introduction of an operating system allows us to improve upon this implementation. Chapter 9. Putting It All Together Application Overview Flashing the LED Printing Hello World Working with Serial Ports The Zilog 85230 Serial Controller A sufficiently high level of technology is indistinguishable from magic. Arthur C. Clarke In this chapter I ll attempt to bring all of the elements we ve discussed so far together into a complete embedded application. I don t have much new material to add to the discussion at this point so the body of the chapter is mainly a description of the code presented herein. My goal is to describe the structure of this application and its source code in such a way that there is no magic remaining for you. You should leave this chapter with a complete understanding of the example program and the ability to develop useful embedded applications of your own. Application Overview The application we re going to discuss is not much more complicated than the Hello World example found in most other programming books. It is a testament to the complexity of embedded software development that this example .

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