programming in c and c multiple choice questions
Programming Embedded Systems in C and C ++ docx
... Serial Controller 149 Chapter 10. Optimizing Your Code 151 10.1 Increasing Code Efficiency 151 10.2 Decreasing Code Size 154 10.3 Reducing Memory Usage 156 10.4 Limiting the Impact of C+ + 157 ... running the same software in a simulator. If Programming Embedded Systems in C and C+ + - 44 - you should see is the C source code for main, with a cursor indicating that the embedded processor's ... The hardware-specific constant CYCLES_PER_MS represents the number of decrement -and- test cycles (nCycles != 0) that the processor can perform in a single millisecond. To determine this number...
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Program C Ansi Programming Embedded Systems in C and C++ phần 1 doc
... seriously. In some cases, two or more of the criteria are linked. For example,increases in processing power could lead to increased production costs. Conversely, we might imagine that the sameincrease ... for use in a line of business calculators produced by the Japanese company Busicom. In 1969, Busicomasked Intel to design a set of custom integrated circuits-one for each of their new calculator ... equivalent device that does not contain the processor and software. This could be done byreplacing the combination with a custom integrated circuit that performs the same functions in hardware....
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Program C Ansi Programming Embedded Systems in C and C++ phần 3 ppt
... T0CMPB (PCB_BASE + 0x34)#define T0CON (PCB_BASE + 0x36)#define T1CNT (PCB_BASE + 0x38)#define T1CMPA (PCB_BASE + 0x3A)#define T1CMPB (PCB_BASE + 0x 3C) #define T1CON (PCB_BASE + 0x3E)#define ... 0x 0C) #define REQST (PCB_BASE + 0x0E)#define INSTS (PCB_BASE + 0x10)/* * Timer/Counters */#define TCUCON (PCB_BASE + 0x12)#define T0CNT (PCB_BASE + 0x30)#define T0CMPA (PCB_BASE + 0x32)#define ... 0x52)#define P1CON (PCB_BASE + 0x54)#define P1LTCH (PCB_BASE + 0x56)#define P2DIR (PCB_BASE + 0x58)#define P2PIN (PCB_BASE + 0x5A)#define P2CON (PCB_BASE + 0x 5C) #define P2LTCH (PCB_BASE + 0x5E)Other...
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Program C Ansi Programming Embedded Systems in C and C++ phần 4 potx
... device. Both of thesesolutions work very well in practice.6.3.2 Cyclic Redundancy CodesA cyclic redundancy code (CRC) is a specific checksum algorithm that is designed to detect the most common ... off having some way to confirm that the device is working and that the data it containsis valid. That's where checksums and cyclic redundancy codes come in. 6.3.1 ChecksumsHow can we tell ... device being verified. This makes insertion of the checksum easy-just compute thechecksum and insert it into the memory image prior to programming the memory device. When you recalculate thechecksum,...
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Program C Ansi Programming Embedded Systems in C and C++ phần 5 ppsx
... remainder; }} /* crcInit() */Finally, we arrive at the actual workhorse routine, crcCompute. This is a routine that you can call over and overfrom your application to compute and verify CRC checksums. ... checksums. An additional benefit of splitting the computationbetween crcInit and crcCompute is that the crcInit function need not be executed on the embedded system. Instead,this function can ... containedwithin the 80188EB processor. I have chosen to implement this driver -and all of the remaining examples in thebook -in C+ +. Although C+ + offers no additional assistance over C in accessing...
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Program C Ansi Programming Embedded Systems in C and C++ phần 6 potx
... the routines contextInit and os.readyList.insert. The contextInit routine establishes the initialcontext for a task. This routine is necessarily processor-specific and, therefore, written in assembly ... system.8.2.3 Context SwitchThe actual process of changing from one task to another is called a context switch. Because contexts are processor-specific, so is the code that implements the context switch. ... virtue of the fact that it no longer exists!A third scheduling point is called the clock tick. The clock tick is a periodic event that is triggered by a timerinterrupt. The clock tick provides...
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Program C Ansi Programming Embedded Systems in C and C++ phần 7 docx
... constructor. This routine is responsible for initializing the three private datamembers and configuring the requested data channel within the SCC hardware:#include "scc.h"static SCC scc;/********************************************************************** ... execute during that interval. So we want and need a mechanism to protect critical sectionswithin tasks without disabling interrupts. And mutexes provide that mechanism.Deadlock and Priority InversionMutexes ... theassociated interrupt service routine. When an interrupt occurs, the processor must take several steps before executingthe ISR. First, the processor must finish executing the current instruction....
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Program C Ansi Programming Embedded Systems in C and C++ phần 8 ppsx
... of other communicationprotocols.Here's how the SCC class is actually defined:#include "circbuf.h"class SCC{ public: SCC(); void reset(int channel); void init(int channel, ... course, not everything introduced in C+ + is expensive. Many older C+ + compilers incorporate a technologycalled C- front that turns C+ + programs into C and feeds the result into a standard C compiler. ... engineering practice dictates against the use of thistechnique. But in a pinch, goto statements can be used to remove complicated controlstructures or to share a block of oft repeated code. In...
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Program C Ansi Programming Embedded Systems in C and C++ phần 9 pptx
... debugging tools.< BACK CONTINUE > C CISCComplex Instruction Set Computer. Describes the architecture of a processor family. CISC processors generallyfeature variable-length instructions and ... havespecial I/O space instructions called in and out. Contrast with memory space.< BACK CONTINUE >LlinkerA software development tool that accepts one or more object files as input and ... function calls, or software interrupts, and a periodic clock tick. The operatingsystem is responsible for deciding which task should be using the processor at a given time and for controlling...
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Program C Ansi Programming Embedded Systems in C and C++ phần 10 pps
... best maintained and it has links to many of the others.CPU Info Center (http://bwrc.eecs.berkeley.edu/CIC/)Tons of information about new and old processors alike. Includes a section specifically ... learn which subroutines are the most critical and, therefore, demand the greatest code efficiency.program counterSee instruction pointer.RRAMRandom-Access Memory. A broad classification of ... memory devices that includes all devices in which individual memory locations can be read or written as required.RISCReduced Instruction Set Computer. Describes the architecture of a processor...
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