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1 %$Header$
3 \chapter{\cdaazerolongtitle{}}
5 \label{cdaa0}
7 \beginchapterquote{``Without censorship, things can get terribly confused
8 in the public mind.''}{General William Westmoreland}
10 \section{Introduction}
11 %Section Tag: INT
13 In practice, preparing the ROM image of a microcontroller software product
14 is a complex process that exceeds the capabilities of standard development
15 tools such as compilers, assemblers, and linkers. The specific
16 elements of the process that exceed the capabilities of standard ``off-the-shelf''
17 development tools are:
19 \begin{itemize}
20 \item ROM checksums must typically be generated and placed at a specific
21 location in ROM.
22 \item Suspicious conditions that may indicate a software error
23 should be detected. Suspicious conditions include
24 versions of compilers or other development tools that are
25 not the expected versions, files which are not checked into
26 version control, extra files, missing files, etc.
27 \item Coding standards should be automatically enforced during the
28 build process. Violations of coding standards should prevent
29 a production build.
30 \item Product defects should be fed back into the tool set.\footnote{Product
31 defects should also be fed back into the training for software
32 developers, and into the software process.} If the root cause
33 of a product defect is found to be automatically detectable,
34 tools should be enhanced to prevent recurrence of the defect.
35 \item Redundancy should be eliminated or minimized in all of the
36 materials---including the code---which are maintained as
37 part of software developments. Examples of redundancy include:
38 \begin{itemize}
39 \item Network message lists are often redundant with respect to
40 the code. Network message lists often are processed to
41 form data tables in the code, and sometimes even influence
42 the structure of the code.
43 \item Software modules are often redundant with respect to
44 each other. For example, it is common for task schedulers
45 and real-time operating systems to contain lists of
46 function pointers. These lists of function pointers
47 must be maintained to be consistent with the functions
48 (usually in different source files). The maintenance
49 of consistency should be automatic (the lists of function
50 pointers should be maintained automatically).
51 \end{itemize}
52 \item Organizations often maintain ``bookshelves''---collections of
53 re-usable software components. Often, ``customizing'' the
54 software components (i.e. using them from the bookshelf)
55 is a task that exceeds the capabilites of the `C' preprocessor
56 or other simple tools.
57 \item Some mappings that are helpful in code are too complex to
58 be performed by the `C' preprocessor or other simple
59 tools. For example, if one accepts 1.6093 as the
60 ideal conversion factor from miles-per-hour to
61 kilometers-per-hour, the best rational approximation with
62 numerator and denominator not exceeding 255 is 243/151.\footnote{See
63 Chapters \cfryzeroxrefhyphen{}\ref{cfry0},
64 \ccfrzeroxrefhyphen{}\ref{ccfr0},
65 and \cratzeroxrefhyphen{}\ref{crat0}.} The mapping from
66 (1.6093, 255, 255) to (243,151) is too complex to be made
67 by the `C' preprocessor.
68 \end{itemize}
70 In this chapter, we present a solution based around the scripting language
71 Tcl.
73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
74 \noindent\begin{figure}[!b]
75 \noindent\rule[-0.25in]{\textwidth}{1pt}
76 \begin{tiny}
77 \begin{verbatim}
78 $HeadURL$
79 $Revision$
80 $Date$
81 $Author$
82 \end{verbatim}
83 \end{tiny}
84 \noindent\rule[0.25in]{\textwidth}{1pt}
85 \end{figure}
86 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
87 %
88 %End of file C_DAA0.TEX


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