programming in c and c multiple choice questions
Programming Embedded Systems in C and C ++ docx
Ngày tải lên :
17/03/2014, 13:20
... 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+ +
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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
Ngày tải lên :
05/08/2014, 10:21
... 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 same
increase ... for use in a line of business calculators produced by the Japanese company Busicom. In 1969, Busicom
asked 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 by
replacing 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
Ngày tải lên :
05/08/2014, 10:21
... 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
Ngày tải lên :
05/08/2014, 10:21
... device. Both of these
solutions work very well in practice.
6.3.2 Cyclic Redundancy Codes
A 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 contains
is valid. That's where checksums and cyclic redundancy codes come in.
6.3.1 Checksums
How can we tell ... device being verified. This makes insertion of the checksum easy-just compute the
checksum and insert it into the memory image prior to programming the memory device. When you recalculate the
checksum,...
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Program C Ansi Programming Embedded Systems in C and C++ phần 5 ppsx
Ngày tải lên :
05/08/2014, 10:21
... remainder;
}
} /* crcInit() */
Finally, we arrive at the actual workhorse routine, crcCompute. This is a routine that you can call over and over
from your application to compute and verify CRC checksums. ... checksums. An additional benefit of splitting the computation
between crcInit and crcCompute is that the crcInit function need not be executed on the embedded system. Instead,
this function can ... contained
within the 80188EB processor. I have chosen to implement this driver -and all of the remaining examples in the
book -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
Ngày tải lên :
05/08/2014, 10:21
... the routines contextInit and os.readyList.insert. The contextInit routine establishes the initial
context for a task. This routine is necessarily processor-specific and, therefore, written in assembly ... system.
8.2.3 Context Switch
The 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 timer
interrupt. The clock tick provides...
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Program C Ansi Programming Embedded Systems in C and C++ phần 7 docx
Ngày tải lên :
05/08/2014, 10:21
... constructor. This routine is responsible for initializing the three private data
members 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 sections
within tasks without disabling interrupts. And mutexes provide that mechanism.
Deadlock and Priority Inversion
Mutexes ... the
associated interrupt service routine. When an interrupt occurs, the processor must take several steps before executing
the ISR. First, the processor must finish executing the current instruction....
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