嵌入式系统中c的开发资源-CSDN文库

共63个文件

gif：48个

htm：15个

嵌入式系统中c的开发

需积分: 9 145 浏览量 2008-12-11 09:16:45 上传评论收藏 627KB RAR 举报

资源推荐

资源详情

资源评论

收起资源包目录

c的开发.rar （63个子文件）

嵌入式系统中c的开发

Developing Embedded Software in C -- Jonathan W_ Valvano.files

MacApple.gif 504B

Chapter 7 Pointers -- Valvano.files

fifo.gif 64KB

pt.gif 40KB

reg.gif 4KB

Chapter 5 Expressions -- Valvano.files

Image34.gif 4KB

Image36.gif 3KB

Image28.gif 3KB

Image30.gif 4KB

Image26.gif 3KB

Image27.gif 3KB

Image25.gif 3KB

Image35.gif 3KB

Image32.gif 4KB

Image29.gif 3KB

Image33.gif 2KB

Chapter 2 Tokens -- Valvano.htm 43KB

legal.htm 1KB

Chapter 8 Arrays and Strings -- Valvano.htm 33KB

Developing Embedded Software in C -- Jonathan W_ Valvano.htm 11KB

Chapter 10 Functions -- Valvano.files

module.gif 7KB

Image40.gif 6KB

fsm.GIF 4KB

Image39.gif 5KB

stck.gif 213KB

stacks.gif 6KB

Chapter 12 Assembly Language Programming -- Valvano.htm 30KB

Chapter 3 Numbers, Characters and Strings -- Valvano.htm 67KB

Chapter 10 Functions -- Valvano.htm 54KB

Chapter 11 Preprocessor Directives -- Valvano.htm 18KB

Chapter 4 Variables and Constants -- Valvano.files

lv.gif 72KB

stack11a.gif 1KB

Chapter 6 Flow of Control -- Valvano.htm 30KB

Chapter 9 Structures -- Valvano.htm 53KB

Chapter 5 Expressions -- Valvano.htm 51KB

Chapter 6 Flow of Control -- Valvano.files

FLOW34.GIF 2KB

FLOW28.GIF 2KB

FLOW35.GIF 2KB

FLOW1.GIF 2KB

Chapter 3 Numbers, Characters and Strings -- Valvano.files

Image21.gif 3KB

Image18.gif 1KB

Image22.gif 2KB

Image20.gif 2KB

Image19.gif 2KB

Image17.gif 3KB

Image16.gif 3KB

Chapter 12 Assembly Language Programming -- Valvano.files

add3stk.gif 3KB

Appendix 1_ BDM Adapt812 Setup -- Valvano.htm 12KB

Chapter 1 Program Structure -- Valvano.files

AssFig0.gif 10KB

AssFig7.gif 26KB

Chapter 1 Program Structure -- Valvano.htm 65KB

Chapter 9 Structures -- Valvano.files

huff3.gif 2KB

link1.gif 2KB

Image41.gif 5KB

huff2.gif 2KB

huff1.gif 4KB

fsm.gif 5KB

link2.gif 5KB

Chapter 7 Pointers -- Valvano.htm 37KB

Appendix 1_ BDM Adapt812 Setup -- Valvano.files

ICC12A.GIF 16KB

BDM.GIF 7KB

ICC12C.GIF 13KB

ICC12B.GIF 15KB

Chapter 4 Variables and Constants -- Valvano.htm 63KB

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">  <HTML><HEAD><TITLE>Chapter 3: Numbers, Characters and Strings -- Valvano</TITLE> <META http-equiv=content-type content=text/html;charset=iso-8859-1> <META content="MSHTML 5.50.3825.1300" name=GENERATOR> <META content="Power HD:Applications:Microsoft Office 98:Templates:Web Pages:Blank Web Page" name=Template></HEAD> <BODY vLink=#800080 link=#0000ff> Chapter 3: Numbers, Characters and Strings What's in Chapter 3? <DIR> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BINARY">How are numbers represented on the computer</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BM8BITUNSIGNED">8-bit unsigned numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BM8BITSIGNED">8-bit signed numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BM16BITUNSIGNED">16-bit unsigned numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BM16BITSIGNED">16-bit signed numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#ENDIAN">Big and little endian </A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#BOOLEAN">Boolean (true/false)</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#DECIMAL">Decimal numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#HEX">Hexadecimal numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#OCTAL">Octal numbers</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#CHARACTER">Characters</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#STRING">Strings</A> <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#ESCAPE">Escape sequences</A> </DIR> This chapter defines the various data types supported by the compiler. Since the objective of most computer systems is to process data, it is important to understand how data is stored and interpreted by the software. We define a literal as the direct specification of the number, character, or string. E.g., <DIR> <DIR> <CODE>100 'a' "Hello World"</CODE></DIR></DIR> are examples of a number literal, a character literal and a string literal respectively. We will discuss the way data are stored on the computer as well as the C syntax for creating the literals. The Imagecraft and Hiware compilers recognize three types of literals (numeric, character, string). Numbers can be written in three bases (<A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#DECIMAL">decimal</A>, <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#OCTAL">octal</A>, and <A href="http://www.ece.utexas.edu/~valvano/embed/chap3/chap3.htm#HEX">hexadecimal</A>). Although the programmer can choose to specify numbers in these three bases, once loaded into the computer, the all numbers are stored and processed as unsigned or signed binary. Although C does not support the binary literals, if you wanted to specify a binary number, you should have no trouble using either the octal or hexadecimal format. <A name=BINARY></A>Binary representation Numbers are stored on the computer in binary form. In other words, information is encoded as a sequence of 1’s and 0’s. Precision is the number of distinct or different values. We express precision in alternatives, decimal digits, bytes, or binary bits. We use the expression 41/2 decimal digits to mean about 20,000 alternatives, and the expression 43/4 decimal digits to mean more than 20,000 alternatives but less than 100,000 alternatives. The following table illustrates the various representations of precision. <TABLE cellSpacing=0 width=398 border=0> <TBODY> <TR> <TD vAlign=top width="22%">binary bits</TD> <TD vAlign=top width="17%">bytes</TD> <TD vAlign=top width="32%">alternatives</TD> <TD vAlign=top width="29%">decimal digits</TD></TR> <TR> <TD vAlign=top width="22%">8</TD> <TD vAlign=top width="17%">1</TD> <TD vAlign=top width="32%">256</TD> <TD vAlign=top width="29%">2 1/2</TD></TR> <TR> <TD vAlign=top width="22%">10</TD> <TD vAlign=top width="17%"> </TD> <TD vAlign=top width="32%">1024</TD> <TD vAlign=top width="29%">3</TD></TR> <TR> <TD vAlign=top width="22%">12</TD> <TD vAlign=top width="17%"> </TD> <TD vAlign=top width="32%">4096</TD> <TD vAlign=top width="29%">3 3/4</TD></TR> <TR> <TD vAlign=top width="22%">16</TD> <TD vAlign=top width="17%">2</TD> <TD vAlign=top width="32%">65,536</TD> <TD vAlign=top width="29%">4 3/4</TD></TR> <TR> <TD vAlign=top width="22%">20</TD> <TD vAlign=top width="17%"> </TD> <TD vAlign=top width="32%">1,048,576</TD> <TD vAlign=top width="29%">5</TD></TR> <TR> <TD vAlign=top width="22%">24</TD> <TD vAlign=top width="17%">3</TD> <TD vAlign=top width="32%">16,777,216</TD> <TD vAlign=top width="29%">7 1/2</TD></TR> <TR> <TD vAlign=top width="22%">30</TD> <TD vAlign=top width="17%"> </TD> <TD vAlign=top width="32%">1,073,741,824</TD> <TD vAlign=top width="29%">9</TD></TR> <TR> <TD vAlign=top width="22%">32</TD> <TD vAlign=top width="17%">4</TD> <TD vAlign=top width="32%">4,294,967,296</TD> <TD vAlign=top width="29%">9 3/4</TD></TR></TBODY></TABLE> <ADDRESS>Table 3-1. Relationships between various representations of precision.</ADDRESS>   <DIR> <ADDRESS>Observation: A good rule of thumb to remember is 210•n is about 103•n. </ADDRESS> <DIR>  </DIR></DIR> For large numbers we use abbreviations, as shown in the following table. For example, 16K means 16*1024 which equals 16384. Computer engineers use the same symbols as other scientists, but with slightly different values.   <TABLE cellSpacing=0 width=487 border=0> <TBODY> <TR> <TD vAlign=top width="21%">abbreviation</TD> <TD vAlign=top width="18%">pronunciation</TD> <TD vAlign=top width="39%">Computer Engineering Value</TD> <TD vAlign=top width="21%">Scientific Value</TD></TR> <TR> <TD vAlign=top width="21%">K</TD> <TD vAlign=top width="18%">"kay"</TD> <TD vAlign=top width="39%">210 1024</TD> <TD vAlign=top width="21%">103 </TD></TR> <TR> <TD vAlign=top width="21%">M</TD> <TD vAlign=top width="18%">"meg"</TD> <TD vAlign=top width="39%">220 1,048,576</TD> <TD vAlign=top width="21%">106 </TD></TR> <TR> <TD vAlign=top width="21%">G</TD> <TD vAlign=top width="18%">"gig"</TD> <TD vAlign=top width="39%">230 1,073,741,824</TD> <TD vAlign=top width="21%">109 </TD></TR> <TR> <TD vAlign=top width="21%">T</TD> <TD vAlign=top width="18%">

评论收藏

内容反馈