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1 %$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/winprojs/scirfmmon/docs/man20081211a/man20081211a.tex,v 1.20 2009/01/17 22:17:01 dashley Exp $
2 \documentclass[letterpaper,10pt,titlepage]{article}
3 //-------------------------------------------------------------------------------------------------
4 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
5 //PUBLIC LICENSE, Version 3, full license text below.
6 //-------------------------------------------------------------------------------------------------
8 // Version 3, 29 June 2007
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573 //be similar in spirit to the present version, but may differ in detail to
574 //address new problems or concerns.
575 //
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577 //Program specifies that a certain numbered version of the GNU General
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580 //version or of any later version published by the Free Software
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587 //public statement of acceptance of a version permanently authorizes you
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677 //may consider it more useful to permit linking proprietary applications with
678 //the library. If this is what you want to do, use the GNU Lesser General
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681 //-------------------------------------------------------------------------------------------------%
682 %\pagestyle{headings}
683 %
684 \usepackage{amsmath}
685 \usepackage{amsfonts}
686 \usepackage{amssymb}
687 \usepackage[ansinew]{inputenc}
688 \usepackage[OT1]{fontenc}
689 \usepackage{graphicx}
690 \usepackage{makeidx}
691 %
692 %-----------------------------------------------------------------------------------
693 %Constants
694 \newcommand{\productversion}{0.1a}
695 \newcommand{\productname}{scirfmmon}
696 \newcommand{\productnameemph}{\emph{\productname}}
697 \newcommand{\productcompiledate}{Jan 17 2009}
698 \newcommand{\productassertletter}{a}
699 \newcommand{\productversionhash}{63570560d4fd6dc71431d7bca67c8ff35c9fd1fe}
700 %-----------------------------------------------------------------------------------
701 %New environments
702 %The following environment is for the glossary of terms at the end, if
703 %included.
704 \newenvironment{docglossaryenum}{\begin{list}
705 {}{\setlength{\labelwidth}{0mm}
706 \setlength{\leftmargin}{4mm}
707 \setlength{\itemindent}{-4mm}
708 \setlength{\parsep}{0.85mm}}}
709 {\end{list}}
710 %%
711 %The following environment is for the database table and field
712 %documentation at the end, if included.
713 \newenvironment{docdbtblfielddef}{\begin{list}
714 {}{\setlength{\labelwidth}{0mm}
715 \setlength{\leftmargin}{10mm}
716 \setlength{\itemindent}{-5mm}
717 \setlength{\parsep}{0.85mm}}}
718 {\end{list}}
719 %%
720 %-----------------------------------------------------------------------------------
721 %Embarrassingly, I've forgotten why "makeindex" is necessary ...
722 \makeindex
723 %
724 \begin{document}
725 %-----------------------------------------------------------------------------------
726 %"See" References
727 %-----------------------------------------------------------------------------------
728 \title{\textbf{\huge{The \productnameemph{} Program, Version \productversion{}}\\\vspace*{0.7cm}
729 \normalsize{(\productcompiledate{}, \productassertletter{}, \productversionhash{})}}}
730 \author{\vspace*{3.0cm}\\%
731 \small{David T. Ashley (\texttt{dashley@gmail.com})}}
732 \date{\vspace*{3.5cm}\small{Document Version Control $ $Revision: 1.20 $ $ \\
733 Document Version Control $ $Date: 2009/01/17 22:17:01 $ $ (UTC) \\
734 Document $ $RCSfile: man20081211a.tex,v $ $ \\
735 Document \LaTeX{} Compilation Date: \today{}}}
736 \maketitle
737 \begin{abstract}
738 This document describes the \productnameemph{} program,
739 version \productversion{} (mnemonic: \emph{SCI} \emph{RF} \emph{m}odule
740 \emph{mon}itor). The \productnameemph{} program is a console-mode \emph{Win32} program
741 that monitors SCI communication between
742 a host microcontroller and the LS Research \emph{FreeStar Module}, analyzes character and
743 packet transmissions and exchanges, logs communication activity,
744 and outputs diagnostic information.
745 \\\\
746 This document also provides some information about a hardware configuration that will
747 work to interface the SCI lines of a host microcontroller to the
748 \productnameemph{} program running on a PC.
749 \\\\
750 The \productnameemph{} program and all related documentation
751 is provided under the GPL (GNU General
752 Public License).
753 \end{abstract}
755 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
756 \clearpage{}
757 \pagenumbering{roman} %No page number on table of contents.
758 \tableofcontents{}
759 \clearpage{}
760 \listoffigures
761 \clearpage{}
763 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
764 %Force the page number to 1. We don't want to count the TOC page(s) as a
765 %used-up number.
766 %
767 \setcounter{page}{1}
768 \pagenumbering{arabic}
770 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
771 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
772 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
773 \section{Introduction and Overview}
774 \label{siov0}
777 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
778 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
779 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
780 \subsection{Overview of \productnameemph{}}
781 \label{siov0:sovw0}
783 \index{\productname@\productnameemph{}}\productnameemph{} is a \emph{Win32} console-mode
784 application that:
786 \begin{itemize}
787 \item Monitors the SCI traffic between one host system and one LS Research Freestar
788 Module.
789 (Because the traffic is bidirectional and full duplex, two serial adapters are
790 required.)
791 \item Logs and displays the characters transmitted between the host system and FreeStar Module.
792 \item Logs, displays, and analyzes the packets transmitted between each host system and FreeStar
793 Module, flagging any errors or anomalies.
794 \end{itemize}
796 \productnameemph{} is designed so that:
798 \begin{itemize}
799 \item It can use any serial ports that \emph{Windows} recognizes; including ports built into
800 the motherboard of a laptop
801 or desktop PC, bus expansion cards, and USB-to-serial adapters.
802 \end{itemize}
804 \productnameemph{} is designed to run under
805 \index{Windows XP@\emph{Windows XP}}\emph{Windows XP}
806 and \index{Windows Vista@\emph{Windows Vista}}\emph{Windows Vista} only (although
807 it is possible that it will run under other versions of
808 \emph{Windows}).
811 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
812 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
813 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
814 \subsection{License}
815 \label{siov0:slic0}
817 \index{license}The \productnameemph{} program and all related documentation
818 is provided under the \index{GPL}GPL (\index{GNU General Public License}%
819 GNU General Public
820 License) \cite{bibref:swlic:gpl}.
822 The reason for the selection of the GPL is so that LSR and CEL can pass this solution
823 (including source code) on to customers without restrictions.
825 The GPL does require that modifications to the program be made public. There
826 are several ways to meet this requirement, including:
828 \begin{itemize}
829 \item The modified source code may be posted on a website (\emph{any} website).
830 \item The modified source code may be supplied to
831 Dave Ashley \cite{{bibref:i:daveashley}}, and Dave
832 may integrate the changes into the version control archives and re-release the
833 program.
834 \item The entity making the modifications may create a project at
835 \index{SourceForge@\emph{SourceForge}}\emph{SourceForge} \cite{bibref:osws:sourceforge}
836 or add the source code to an existing \emph{SourceForge} project.
837 \end{itemize}
839 Dave Ashley \cite{bibref:i:daveashley} is the logical first contact for discussion
840 about how to make modified source code public.
843 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
844 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
845 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
846 \subsection{Versioning of Executable Program}
847 \label{siov0:svin0}
849 In the console output and at the start of log files, the
850 \productnameemph{} program writes a line similar to the following. This
851 line is a version identification line.
852 \\\\
853 \begin{footnotesize}
854 \noindent{}\texttt{scirfmmon, v0.1a (Jan 15 2009, A, 0132f11a686cd6efcb395cef23b2231106d5fd25)}\\
855 \end{footnotesize}
857 The components of the version identification line are:
859 \begin{itemize}
860 \item The program name (``\texttt{scirfmmon}'').
861 \item The version number (``\texttt{v0.1a}'').
862 \item The compile date (``\texttt{Jan 15, 2009}'').
863 \item Whether or not debugging assertions are enabled (``\texttt{A}''). (``\texttt{A}''
864 indicates that debugging assertions are enabled, whereas ``\texttt{a}''
865 would indicate that debugging assertions are disabled.)
866 \item A hash (``\texttt{0132f11a686cd6efcb395cef23b2231106d5fd25}'')
867 calculated as a function
868 of the version control information and compile date/time
869 information as known to the compiler and embedded in the software source files.
870 (The purpose of the hash is to decisively identify different compilations of the
871 program that unwisely have the same version number. Compilation at a different date or time
872 or using a different version control revision
873 of a source file will
874 result in a different hash.)
875 \end{itemize}
878 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
879 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
880 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
881 \subsection{Revision History}
882 \label{siov0:srhs0}
884 \begin{itemize}
885 \item \textbf{0.1a, January 17, 2009, a,\\
886 63570560d4fd6dc71431d7bca67c8ff35c9fd1fe}\\
887 Initial release. No known defects other than documented in
888 \S{}\ref{skli0}.
889 \end{itemize}
891 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
892 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
893 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
894 \section{Software Design and Theory of Operation}
895 \label{sswd0}
898 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
899 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
900 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
901 \subsection{General Theory of Operation}
902 \label{sswd0:sgto0}
904 The general theory of operation of the \productnameemph{}
905 program is that:
907 \begin{itemize}
908 \item Each serial interface to the target system is
909 2-wire only (ground and received data)\@. Data is not
910 transmitted by \productnameemph{}
911 (it is only received). Neither hardware nor software
912 handshaking
913 is used.
914 \item The program uses exactly three threads:
915 \begin{itemize}
916 \item Two identical communication worker threads (one for each serial
917 port)\@. These threads each:
918 \begin{itemize}
919 \item Poll a single serial port using the
920 \emph{Windows} serial API.
921 \item Place received characters and events (serial
922 break, several types of errors) into a queue. There is
923 a separate queue for each serial port.
924 \item Separately timestamp received characters and events\@. (Because
925 of thread scheduling latencies and for other reasons,
926 this means that it is difficult to determine
927 exact timing relationships between characters arriving on
928 \emph{different} serial ports.)
929 \end{itemize}
930 \item The primary thread which:
931 \begin{itemize}
932 \item Accepts input from the two communication worker threads
933 via two queues of events.\footnote{Not related to the
934 \emph{Windows} notion of events.} (Received characters
935 as well as detected
936 serial communcation errors are events.)
937 \item Duplicates (or ``fans out'') queued events into other queues.
938 (There is a
939 separate queue for event logging, and a separate queue for
940 packet analysis,
941 for example).
942 \item Processes and parses events, characters, and packets.
943 \item Writes information to several log files, created automatically in
944 the working directory whenever the program is invoked.
945 \item Writes information to the standard output (usually the console).
946 \item Accepts CTRL-C as a termination signal and gracefully stops the
947 communication worker threads as part of the termination sequence.
948 \end{itemize}
949 \end{itemize}
950 \item Because of IPC issues between threads, there is some care taken
951 in the way that the communication worker threads and the
952 primary thread share queues (\S{}\ref{sswd0:sqip0}).
953 \end{itemize}
956 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
957 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
958 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
959 \subsection{Serial Communication Theory of Operation}
960 \label{sswd0:ssct0}
962 The most helpful online information about the \emph{Win32} serial
963 communication API is \cite{bibref:twp:ms810467}. \cite{bibref:twp:ms810467}
964 describes
965 both nonoverlapped and overlapped I/O.
967 For simplicity, the \productnameemph{} uses exclusively nonoverlapped
968 I/O\@. Within each communcation worker thread (\texttt{cw\_threads.c}), the
969 \emph{ClearCommError()} function is called repeatedly
970 to obtain the number of characters available. If characters are available,
971 the precise number of available characters is requested via the
972 \emph{ReadFile()} call. If no characters are available,
973 one character is requested via the \emph{ReadFile()} call, forcing
974 the \emph{ReadFile()} call to either time out or return immediately
975 when at least one character becomes available.
978 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
979 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
980 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
981 \subsection{Queueing and IPC Theory of Operation}
982 \label{sswd0:sqip0}
984 The bulk of \productnameemph{} is ordinary C programming with no IPC
985 considerations. Queues of timestamped events are carried through the program, where
986 an event is either a received character, a serial communication error (such
987 as a parity error), or a serial communication event (such as a received
988 \emph{break}).
990 In the shared data structures between the communication worker threads
991 and the primary thread, however, IPC issues do exist. The way these
992 IPC issues are handled is described in this section.
994 The \emph{Win32} API is incompletely documented, so the
995 \emph{EnterCriticalSection()} and \emph{LeaveCriticalSection()}
996 functions were evaluated to determine their underlying behavior
997 (\texttt{thread\_test.c}).
998 It was determined that these functions won't necessarily allow threads
999 to enter critical sections in the same order that entry is attempted.
1000 Under the right conditions where there is accidental synchronization between thread
1001 scheduling, this could lead to deadlock (although it is improbable)\@.
1002 For this reason, \emph{EnterCriticalSection()} and \emph{LeaveCriticalSection()}
1003 were not used to handle the IPC issues in sharing a queue between the
1004 communication worker threads and the primary thread.
1006 The \emph{Win32} documentation indicates that reads and writes to
1007 a 32-bit integer are always atomic, so the following simple mechanism
1008 was used to share data between the communication worker threads and the
1009 primary thread. The details of the mechanism (per queue) are:
1011 \begin{itemize}
1012 \item Each communication worker thread has a 32-bit variable reserved to
1013 indicate whether the communication worker thread or the primary thread
1014 is allowed to access the shared queue.
1015 \begin{itemize}
1016 \item The value of zero indicates that the communication worker thread
1017 is allowed to place characters into the queue. (After placing
1018 characters into the queue, the communication worker thread should
1019 change the value of the variable to a non-zero value.)
1020 \item A non-zero value indicates that the primary thread is allowed
1021 to consume characters from the queue. (After removing characters
1022 from the queue, the primary thread should change the value of the
1023 variable to zero.)
1024 \end{itemize}
1025 \item The mechanism is safe because in all threads a test is done
1026 before the assignment. The communication worker thread
1027 will change the value of the variable only if it is zero, and
1028 the primary thread will change the value of the variable only
1029 if it is non-zero.
1030 \end{itemize}
1032 \begin{figure}
1033 \centering
1034 \begin{small}
1035 \begin{verbatim}
1036 //Try to move the characters from the
1037 //intermediate queue to the thread synchronization
1038 //queue. The thread synchronization queue is a
1039 //shared resource, so there is a protocol.
1040 //
1041 if (inceq.n != 0)
1042 {
1043 if (C_MAIN_TsQueueSyncSemaphore0 == 0) //Belongs to worker thread.
1044 {
1045 QCHAR_inceq_tsceq_transfer(&inceq, &C_MAIN_tsceq0);
1046 C_MAIN_TsQueueSyncSemaphore0 = 1; //Belongs to primary thread.
1047 }
1048 }
1049 \end{verbatim}
1050 \end{small}
1051 \caption{Communication Worker Thread Source Code to Safely Share Event Queue With Primary
1052 Thread}
1053 \label{fig:sswd0:sqip0:01}
1054 \end{figure}
1056 \begin{figure}
1057 \centering
1058 \begin{small}
1059 \begin{verbatim}
1060 //The transfer out of the TSCEQs has to be coordinated with the worker,
1061 //threads, hence the use of the semaphore variables. Without
1062 //coordination, bizarre effects could result with interleaving of
1063 //access.
1064 //
1065 if (C_MAIN_TsQueueSyncSemaphore0 != 0) //Belongs to primary thread.
1066 {
1067 QCHAR_tsceq_ptceq_transfer(&C_MAIN_tsceq0, &C_MAIN_ptceq0);
1068 C_MAIN_TsQueueSyncSemaphore0 = 0; //Belongs to worker thread.
1069 }
1070 if (C_MAIN_TsQueueSyncSemaphore1 != 0) //Belongs to primary thread.
1071 {
1072 QCHAR_tsceq_ptceq_transfer(&C_MAIN_tsceq1, &C_MAIN_ptceq1);
1073 C_MAIN_TsQueueSyncSemaphore1 = 0; //Belongs to worker thread.
1074 }
1075 \end{verbatim}
1076 \end{small}
1077 \caption{Primary Thread Source Code to Safely Share Event Queue With
1078 Communication Worker Threads}
1079 \label{fig:sswd0:sqip0:02}
1080 \end{figure}
1082 Figure \ref{fig:sswd0:sqip0:01} (p. \pageref{fig:sswd0:sqip0:01}) shows
1083 the code in a communication worker thread to protect access to the
1084 shared queue; and Figure \ref{fig:sswd0:sqip0:02}
1085 (p. \pageref{fig:sswd0:sqip0:02}) shows the analogous code in the
1086 primary thread.
1088 The protocol used for the shared queues (\texttt{C\_MAIN\_tsceq0}
1089 and \texttt{C\_MAIN\_tsceq1} in Figures \ref{fig:sswd0:sqip0:01}
1090 and \ref{fig:sswd0:sqip0:02}) implies (due to thread scheduling
1091 uncertainties) that the shared queues may be unavailable to the
1092 communication worker threads for an unknown period of time once
1093 the coordination variable is assigned to a non-zero value.
1094 For this reason, each communication worker thread keeps an internal
1095 queue to hold received characters until they can be transferred to the
1096 shared queue. The primary thread also keeps queues
1097 (\texttt{C\_MAIN\_ptceq0} and \texttt{C\_MAIN\_ptceq1} in
1098 Figure \ref{fig:sswd0:sqip0:02}) so that the shared queues can be
1099 evacuated quickly and fully. The only queues in the
1100 \productnameemph{} program
1101 shared between threads and subject to special
1102 access protocols are \texttt{C\_MAIN\_tsceq0}
1103 and \texttt{C\_MAIN\_tsceq1}.
1106 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1107 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1108 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1109 \section{Hardware Setup}
1110 \label{shsu0}
1113 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1114 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1115 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1116 \subsection{Hardware Requirements}
1117 \label{shsu0:shrq0}
1119 The \productnameemph{} program uses the serial commication API of \emph{Windows}, so any
1120 serial port recognized by \emph{Windows} should be satisfactory. Two serial interfaces
1121 are required. \productnameemph{}
1122 should work with any mixture of the following types of serial interfaces:
1124 \begin{itemize}
1125 \item A serial port built into the motherboard of a computer.
1126 \item A serial port installed as a bus expansion card.
1127 \item A serial port interfaced via a USB-to-serial adapter.
1128 \end{itemize}
1130 The interface required to the personal computer is 2-wire only: ground and
1131 received data. The \productnameemph{} program does not transmit data or
1132 use hardware or software flow control (it only monitors serial traffic).
1134 Generally, some electronics are required to interface the serial lines of the
1135 host microcontroller system to a PC, as the RS-232
1136 interface nominally requires 12-volt signals. It is likely that serial adapters
1137 exist that will work at TTL logic levels (negating the need for
1138 interface electronics), but this possibility was not
1139 investigated.
1142 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1143 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1144 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1145 \subsection{Description of a Possible Interface Hardware Configuration}
1146 \label{shsu0:sdph0}
1148 This section describes in detail a hardware configuration that is known to work
1149 for interfacing from a host microcontroller to a personal computer.
1150 The hardware configuration described is certainly not unique.
1152 Note that the interface hardware as described has some limitations.
1153 Please see \S{}\ref{skli0:sdap0}, \S{}\ref{skli0:sgoi0}, and
1154 \S{}\ref{skli0:ssud0}.
1156 The serial adapters used were the \index{Dynex}Dynex \cite{bibref:vendor:dynex}
1157 ``\emph{16-Inch USB PDA/Serial Adapter Cable}'', model \index{DX-UBDB9}DX-UBDB9.
1158 There was no particular reason for choosing this model except availability:
1159 it was on the shelves at \emph{Best Buy} for about \$35.\footnote{\$35 each---two
1160 will cost approximately \$70.} These adapters are shown most clearly in
1161 Figure \ref{fig:shsu0:sdph0:06}. As of January, 2009 these adapters have been
1162 discontinued, but there are other similar adapters available from several
1163 manufacturers.
1165 \begin{figure}
1166 \centering
1167 \includegraphics[width=4.6in]{etminia.eps}
1168 \caption{ET-MINI RS-232 Level Translator, With U.S. Quarter for Size Scale}
1169 \label{fig:shsu0:sdph0:01}
1170 \end{figure}
1172 In order to shift the SCI levels for input into a PC serial adapter,
1173 the ``\emph{RS232 to TTL-3V Converter Mini Board}'' (Figure \ref{fig:shsu0:sdph0:01})
1174 was purchased from \index{Futurelec}Futurelec \cite{bibref:vendor:futurelec}.
1175 (\emph{Note:} \index{Futurelec}Futurelec took a few weeks to deliver the interface boards,
1176 despite the fact that I specified overnight shipping.
1177 If time is critical, I recommend ordering a similar product from another
1178 vendor or building a board from scratch using the ADM3232 or similar.)
1180 \begin{figure}
1181 \centering
1182 \includegraphics[width=4.6in]{rs232transinnera.eps}
1183 \caption{RS-232 Level Translator Box Inside View}
1184 \label{fig:shsu0:sdph0:02}
1185 \end{figure}
1187 The RS-232 converter board was packaged inside a project box
1188 (purchased from \index{Radio Shack}Radio Shack). The
1189 converter board was affixed with standoffs to the back of the top
1190 panel (Figure \ref{fig:shsu0:sdph0:02}).
1192 \begin{figure}
1193 \centering
1194 \includegraphics[width=4.6in]{rs232transtopa.eps}
1195 \caption{RS-232 Level Translator Box Top View}
1196 \label{fig:shsu0:sdph0:03}
1197 \end{figure}
1199 The RS-232 level translator was equipped with batteries, a power switch,
1200 a battery test feature,
1201 and the necessary connections (Figure \ref{fig:shsu0:sdph0:03}).
1203 \begin{figure}
1204 \centering
1205 \includegraphics[width=4.6in]{rs232transdesktopa.eps}
1206 \caption{RS-232 Level Translator Box In Use On Desktop}
1207 \label{fig:shsu0:sdph0:04}
1208 \end{figure}
1210 \begin{figure}
1211 \centering
1212 \includegraphics[width=4.6in]{rs232transmicroconnecta.eps}
1213 \caption{RS-232 Level Translator Box Microcontroller Product Connection}
1214 \label{fig:shsu0:sdph0:05}
1215 \end{figure}
1217 \begin{figure}
1218 \centering
1219 \includegraphics[width=4.6in]{rs232transpcconnecta.eps}
1220 \caption{RS-232 Level Translator Box PC Connection}
1221 \label{fig:shsu0:sdph0:06}
1222 \end{figure}
1224 Figure \ref{fig:shsu0:sdph0:04} shows the level translator in use with a laptop computer.
1225 Figure \ref{fig:shsu0:sdph0:05} shows the connection of the level translator to a
1226 microcontroller product (phono jacks were used).
1227 Figure \ref{fig:shsu0:sdph0:06} shows the connection of the level translator
1228 to a laptop computer.
1231 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1232 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1233 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1234 \section{Program Usage}
1235 \label{susg0}
1238 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1239 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1240 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1241 \subsection{Finding Device Names of PC Serial Ports}
1242 \label{susg0:sfdn0}
1244 Before invoking the \productnameemph{} program, the device names of
1245 the two personal computer serial ports that will be used
1246 to monitor SCI communication must be known.
1248 \begin{figure}
1249 \centering
1250 \includegraphics[width=4.6in]{devmancomassignmentsa.eps}
1251 \caption{Screen Snapshot From \emph{Windows} Device Manager
1252 (\emph{Windows Vista})}
1253 \label{fig:susg0:sfdn0:01}
1254 \end{figure}
1256 Guessing the serial device names is not always possible, especially with USB adapters,
1257 where the port numbers assigned may be $>10$ and may change when the USB adapter
1258 is disconnected and reconnected to the computer.
1260 The device names can typically be found by opening the \emph{Device Manager} (typically
1261 under \emph{System} in the \emph{Windows} control panel). (Naturally, the
1262 devices must be plugged in if they are removable and the correct drivers
1263 must be installed.)
1265 Figure \ref{fig:susg0:sfdn0:01} is a screen snapshot from the \emph{Device Manager}
1266 under \emph{Windows Vista}. Under \emph{Ports (COM \& LPT)} it can be seen
1267 in this figure that the device names are ``COM12'' and ``COM13''.
1270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1271 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1272 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1273 \subsection{Testing and Troubleshooting Serial Ports}
1274 \label{susg0:stts0}
1276 For testing and troubleshooting, it was found that
1277 \index{Realterm@\emph{RealTerm}}\emph{RealTerm} \cite{bibref:swp:realterm}
1278 (free open-source software) works very well for displaying the
1279 characters received by a serial port.
1280 \index{Realterm@\emph{RealTerm}}\emph{RealTerm} is able to display all
1281 received characters in hexadecimal, which is very helpful.
1283 \begin{figure}
1284 \centering
1285 \includegraphics[width=4.6in]{rtermsnapshot01.eps}
1286 \caption{\emph{RealTerm} Screen Snapshot (Hexadecimal Display Selected)}
1287 \label{fig:susg0:stts0:01}
1288 \end{figure}
1290 Figure \ref{fig:susg0:stts0:01} is a screen snapshot of
1291 \index{Realterm@\emph{RealTerm}}\emph{RealTerm} being used
1292 to capture data.
1294 \index{HyperTerminal@\emph{HyperTerminal}}\emph{HyperTerminal} (the default
1295 serial communcation program in many versions of \emph{Windows})
1296 is not recommended because of bugs involving bit 7 of incoming characters
1297 (and perhaps other bugs as well).
1300 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1301 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1302 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1303 \subsection{Program Invocation and Command-Line Parameters}
1304 \label{susg0:spin0}
1306 \productnameemph{} is typically invoked by opening a DOS shell and
1307 typing ``\texttt{\productname{}} \emph{ch0commport}
1308 \emph{ch1commport} \emph{logcharstocon} \emph{logpacketstocon}'' (where
1309 the four required parameters are described in detail below),
1310 followed by \emph{ENTER}. Because the program creates the log files
1311 (\S{}\ref{susg0:slgf0}) in the current working directory, the desired
1312 working directory is normally selected before invoking the program.
1314 It is likely possible to invoke the program via the \emph{Windows} GUI,
1315 but this has not been explored.
1317 \productnameemph{} requires the following four command-line parameters:
1319 \begin{itemize}
1320 \item \emph{ch0commport}\\
1321 \emph{ch1commport}\\
1322 These two parameters are the serial port names
1323 of the communication ports to be used.
1325 By convention, Channel 0 (\emph{ch0commport} above) is the serial communication
1326 from the host microcontroller to the RF module, and Channel 1
1327 (\emph{ch1commport} above) is the
1328 serial communication from the RF module to the host microcontroller.
1330 For example, with the communication hardware implied by
1331 Figure \ref{fig:susg0:sfdn0:01}, invoking the program using the
1332 command line\\\\
1333 \texttt{\productname{} com12 com13 n n}\\\\
1334 would result in the program expecting to listen to the output from
1335 the host microcontroller on \emph{com12} and the output from the
1336 RF module on \emph{com13}.
1337 \item \emph{logcharstocon}\\
1338 \emph{logpacketstocon}\\
1339 Whether to log received characters and received packets, respectively,
1340 to the console (in addition to logging them to the
1341 character and packet log files).
1343 The normal guesses for \emph{yes} and \emph{no}
1344 (``y'', ``1'', ``n'', ``0'', etc.) are all accepted.
1346 Errors are \emph{always} displayed on the console (as well as written to
1347 the alert log
1348 file).
1349 \end{itemize}
1352 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1353 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1354 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1355 \subsection{Program Termination}
1356 \label{susg0:sptm0}
1358 The \productnameemph{} program can be terminated by using CTRL-C. Using
1359 CTRL-C once will signal the program to terminate the communication threads
1360 in an orderly way, write trailing information to log files, and terminate.
1361 Termination may take up to approximately 5 seconds.
1363 The program will also terminate upon a variety of abnormal conditions,
1364 such as unexpected errors from \emph{Win32} API functions.
1367 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1368 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1369 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1370 \subsection{Log Files}
1371 \label{susg0:slgf0}
1373 When started, the \productnameemph{} program creates several log files in
1374 the current working directory. All of the created log files are
1375 plain text and can be viewed, manipulated, and printed
1376 using a text editor. This section describes these files.
1379 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1380 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1381 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1382 \subsubsection{Log File Creation, Naming, and Syntax}
1383 \label{susg0:slgf0:sfcn0}
1385 Log files are named based on the local date and time in
1386 YYYYMMDD\_HHMMSS format. For example, a log file named
1387 ``\texttt{20090116\_131247\_alert.txt}'' was created at
1388 approximately 1:12 p.m. on January 16, 2009 (local time).
1390 When started, \productnameemph{} creates an alert log file (containing error
1391 messages), a character log file (containing a log of received characters,
1392 serial events, and serial errors), a packet log file (containing
1393 information about parsed packets), and a comprehensive log file
1394 (containing all log entries to any file).
1396 Additionally, messages are written to the console (\S{}\ref{susg0:spin0}).
1398 The naming convention for log files means that \productnameemph{}
1399 can be run repeatedly in the same directory and the log file names will
1400 not conflict.
1402 A typical set of log file names from a single invocation of
1403 \productnameemph{} is:
1405 \begin{verbatim}
1406 20090116_131247_alert.txt
1407 20090116_131247_character.txt
1408 20090116_131247_comprehensive.txt
1409 20090116_131247_packet.txt
1410 \end{verbatim}
1412 Within each log file, entries are timestamped in HHMMSS.FFF format,
1413 where ``FFF'' is the fractional portion of the second.
1416 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1417 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1418 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1419 \subsubsection{Alert Log File Contents}
1420 \label{susg0:slgf0:salf0}
1422 The alert log file contains entries that indicate some sort of
1423 unusual event or logical problem. The purpose of the alert log
1424 file is to segregate error messages so that the other log files
1425 do not have to be searched for error messages. Generally, an
1426 empty alert log file indicates no problems in SCI communication.
1428 Typical entries from the alert log file are:
1430 \begin{small}
1431 \begin{verbatim}
1432 131247.848:ALRT: CH01:Non-packet start event discarded: Character: 0x57.
1433 131247.848:ALRT: CH01:Non-packet start event discarded: Character: 0xFF.
1434 \end{verbatim}
1435 \end{small}
1437 Note that:
1439 \begin{itemize}
1440 \item All alert messages are also duplicated to the console.
1441 \item Alert messages are usually also duplicated to the log files(s)
1442 where the messages have relevance. For example, the packet parse errors
1443 reproduced above would also be placed in the packet log file.
1444 \end{itemize}
1447 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1448 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1449 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1450 \subsubsection{Character Log File Contents}
1451 \label{susg0:slgf0:sclf0}
1453 The character log file contains a complete log of received characters,
1454 serial events, and serial errors.
1456 Typical entries from the character log file are:
1458 \begin{footnotesize}
1459 \begin{verbatim}
1460 131247.848:NORM: CH00:<01><12><14><3A><11><00><04><B1><BB><D4><60><00><40><40>
1461 131247.848:NORM: CH00:<01><1D><B4><04>
1462 131247.879:NORM: CH00:<01><12><14><3B><11><00><04><B1><BB><D4><60>
1463 131247.848:NORM: CH01:<57><FF><01><08><94><3A><01><00><D8><04>
1464 131247.864:NORM: CH01:<01><15><95><41><11><D4><00><16><E6><04><B1><AA><EE><02>
1465 131247.864:NORM: CH01:<01>
1466 \end{verbatim}
1467 \end{footnotesize}
1469 Note in the text above
1470 that the log entries between channels are slightly out of chronological order.
1471 Please see \S{}\ref{skli0:sooc0}.
1474 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1475 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1476 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1477 \subsubsection{Packet Log File Contents}
1478 \label{susg0:slgf0:splf0}
1480 The packet log file contains the parsed packets from the two communication channels.
1482 Typical entries from the packet log file are:
1484 \begin{footnotesize}
1485 \begin{verbatim}
1486 131455.144:NORM: CH01:ACK_SEND_DATA (0x94).
1487 131455.144:NORM: cspan=16, mdelta=109.
1488 131455.144:NORM: <01><08><94>
1489 131455.144:NORM: <6D><01><00>
1490 131455.144:NORM: <0B><04>
1491 131455.144:NORM: PACKET_ID: 0x6D, ACK_NACK: 0x01, NUM_RETRIES: 0x00.
1492 131455.129:NORM: CH00:SEND_DATA (0x14).
1493 131455.129:NORM: cspan=15, mdelta=110.
1494 131455.129:NORM: <01><12><14>
1495 131455.129:NORM: <6D><11><00><04><B1><BB><D4><70><00><40><73><01><1D>
1496 131455.129:NORM: <2A><04>
1497 131455.129:NORM: PACKET_ID: 0x6D, TARGET_SENDER: 0x11, ADDRESS_MODE: 0x00.
1498 131455.129:NORM: DST_TRANS_AD: 0xB104.
1499 131455.129:NORM: DATA:
1500 131455.129:NORM: <BB><D4><70><00><40><73><01><1D>
1501 131455.238:NORM: CH01:RXED_DATA (0x95).
1502 131455.238:NORM: cspan=15, mdelta=125.
1503 131455.238:NORM: <01><15><95>
1504 131455.238:NORM: <74><11><E4><00><16><E6><04><B1><AA><E7><02><01><80><6D>
1505 131455.238:NORM: <7E><FF>
1506 131455.238:NORM: <C3><04>
1507 131455.238:NORM: PACKET_ID: 0x74, TARGET_SENDER: 0x11, LQI: 0xE4.
1508 131455.238:NORM: ADDRESS_MODE: 0x00.
1509 131455.238:NORM: DST_TRANS_AD: 0xE616, SRC_TRANS_AD: 0xB104.
1510 131455.238:NORM: DATA:
1511 131455.238:NORM: <AA><E7><02><01><80><6D><7E><FF>
1512 \end{verbatim}
1513 \end{footnotesize}
1515 Each parsed packet is documented as:
1517 \begin{itemize}
1518 \item The channel and packet type.
1519 \item The approximate time span between the first and last
1520 characters of the packet, in milliseconds (``\emph{cspan}'').
1521 A large value of \emph{cspan} would indicate some sort of
1522 a software error in transmitting the packet.
1523 \item The approximate time since the last packet of this type
1524 was received (``\emph{mdelta}'').
1525 \item The raw bytes of the packet, grouped by header, payload,
1526 and trailer.
1527 \item The extracted data (symbolically) from the packet.
1528 \end{itemize}
1530 Note in the text above that the packet entries are sometimes
1531 chronologically out of order between the two channels
1532 (see \S{}\ref{skli0:soop0}).
1535 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1536 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1537 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1538 \subsubsection{Comprehensive Log File Contents}
1539 \label{susg0:slgf0:shlf0}
1541 Each entry written to any other log file is also written to the
1542 comprehensive log. The comprehensive log is simply an interleaved concatenation
1543 of the alert, character, and packet log files.
1546 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1547 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1548 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1549 \subsubsection{Concurrent Access to Log Files Using a Text Editor}
1550 \label{susg0:slgf0:scat0}
1552 As the \productnameemph{} program may run for days or weeks at a time,
1553 it is useful to examine the log files (especially the alert log) before
1554 the program has terminated.
1556 \productnameemph{} opens the log files in a mode compatible with sharing,
1557 so they can be safely viewed read-only with a text editor while the program
1558 is running.
1560 Please see \S{}\ref{skli0:sndf0}.
1563 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1564 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1565 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1566 \section{Known Issues and Limitations}
1567 \label{skli0}
1569 This section describes known issues and limitations with the
1570 \productnameemph{} program or the hardware configuration
1571 described in \S{}\ref{shsu0:sdph0}.
1574 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1575 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1576 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1577 \subsection{Possible Destruction of the ADM3232 Part}
1578 \label{skli0:sdap0}
1580 The level conversion board used is designed to be powered from the same power supply
1581 as the microcontroller.
1583 It is suspected that as the batteries discharge, the TTL
1584 SCI inputs from a product may
1585 damage the \index{ADM3232}ADM3232 part (as the
1586 inputs may be more than a diode drop above the
1587 supply voltage provided by the batteries).
1589 In retrospect, rather than using 3 AA
1590 batteries in series (4.5 volts),
1591 it would have been more prudent to use
1592 4 AA batteries in series (6.0 volts)
1593 with a forward-biased diode to bring the supply
1594 voltage down to about 5.4 volts.
1596 A resistor in series with the SCI inputs
1597 (not included in the first version
1598 of the SCI interface box) may also be prudent.
1601 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1602 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1603 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1604 \subsection{Ground Offset Issues}
1605 \label{skli0:sgoi0}
1607 It was observed that the hardware interface box
1608 (\S{}\ref{shsu0:sdph0}, p. \pageref{shsu0:sdph0})
1609 works perfectly when using a laptop computer, but
1610 less reliably when using a desktop computer.
1612 When the interface box fails to operate, the problem can usually
1613 be cured by disconnecting and then reconnecting the serial cables
1614 to the PC and/or the SCI connections to the microcontroller product.
1616 A ground offset issue involving the power supply and the PC
1617 is suspected.
1620 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1621 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1622 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1623 \subsection{Startup Difficulties}
1624 \label{skli0:ssud0}
1626 The \productnameemph{} may not start reliably in the presence of serial
1627 errors or events (such as a break event on the serial line, typically
1628 caused by the target module being turned off but the interface box being turned
1629 on).
1630 A typical error message involves inability to
1631 obtain serial port state or configure the port.
1633 To get \productnameemph{} to start, remove the serial error, start the
1634 program, then reapply the source of the errors. The two easiest approaches
1635 are:
1637 \begin{itemize}
1638 \item Disconnect the serial cables from the serial adapters, start the program,
1639 then reconnect the cables.
1640 \item Turn off the interface box, start the program, then turn on the interface box.
1641 \item Power up everything (including the target product) before starting the
1642 program.
1643 \end{itemize}
1645 The root cause is that the serial errors cause (by design) certain
1646 \emph{Windows} API functions not to operate until the error is cleared using
1647 another \emph{Windows} API function. The present version of the program will
1648 correctly handle serial errors at any time except startup.
1650 This is a very minor issue and does not affect the logical correctness
1651 of the program once it is running.
1654 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1655 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1656 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1657 \subsection{Inability to Determine Timing Relationships Between Channels}
1658 \label{skli0:itr0}
1660 The three-thread software design may lead to more timestamp inconsistency
1661 between the two channels than necessary. If possible, the design should probably
1662 be changed to two threads and overlapped I/O.
1664 The timestamps have, however, proved to be very accurate.
1667 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1668 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1669 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1670 \subsection{Out-of-Order Character Logging}
1671 \label{skli0:sooc0}
1673 The primary thread dequeues and processes all characters from
1674 Channel 0, then dequeues and processes all characters from Channel 1;
1675 regardless of the chronological ordering of the characters between the
1676 channels.
1677 This can result in characters being logged out of chronological order if
1678 characters are arriving on both channels nearly simultaneously.
1680 This problem can be easily fixed by changing the character logging
1681 algorithm to dequeue the characters in chronological order with respect
1682 to
1683 both queues.
1685 This problem does not affect the correctness of the timestamps in the
1686 character log file. It only affects the ordering of the log
1687 entries. Please see the sample log file text in
1688 \S{}\ref{susg0:slgf0:sclf0}, p. \pageref{susg0:slgf0:sclf0}.
1691 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1692 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1693 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1694 \subsection{Out-of-Order Packet Logging}
1695 \label{skli0:soop0}
1697 The packet logging issue occurs for exactly the same reasons as the
1698 character logging issue discussed in
1699 \S{}\ref{skli0:sooc0}. The solution is analogous---to modify the
1700 packet logging algorithm to process both queues simultaneously and
1701 log packets in chronological order.
1703 The sample text in \S{}\ref{susg0:slgf0:splf0}, p. \pageref{susg0:slgf0:splf0}
1704 illustrates the issue. The SEND\_DATA packet is sent at 131455.129 and it is
1705 followed by the ACK\_SEND\_DATA packet at 131455.144; but the log entries are
1706 not in chronological order.
1708 This issue does not affect the correctness of the log entries---only their
1709 ordering.
1712 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1713 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1714 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1715 \subsection{Suspected Out of Sequence Communication Errors}
1716 \label{skli0:sose0}
1718 It is suspected that framing errors and other errors become events
1719 that are reported out of sequence by the communication worker threads.
1720 The root cause is that communication errors may occur with characters
1721 buffered behind the \emph{Windows} API.
1723 The \productnameemph{} program handles errors first, then dequeues any characters;
1724 although the characters probably came first, followed by the error.
1726 The problem can be fixed by experimenting to determine the behavior of
1727 \emph{Windows} and then changing the communication worker threads to match.
1729 This issue is inconsequential because any communication error
1730 (break, framing error, overrun, etc.) is very serious if it occurs
1731 once the target product is operating, and exactly when it occurred is
1732 less important than that it did occur.
1734 The errors will be detected,
1735 but they may
1736 be slightly out of sequence in the event queue.
1739 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1740 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1741 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1742 \subsection{Non-Detection of Log File Flushes}
1743 \label{skli0:sndf0}
1745 \productnameemph{} flushes the log file streams every 15 seconds using
1746 the \emph{fflush()} function. Still,
1747 \index{SlickEdit@\emph{SlickEdit}}\emph{SlickEdit}
1748 (the text editor I use) does not
1749 exhibit the desired behavior of detecting the updated file when focus
1750 is restored. In order to see additions to a log file, the file must be
1751 closed and then re-opened in \emph{SlickEdit}.
1753 The technical basis for this non-detection should be investigated.
1755 Note that this limitation does not affect the correctness or completeness
1756 of any log file---it only affects whether a typical text editor will
1757 automatically detect that the open file has changed.
1760 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1762 %\clearpage{}
1763 %\section{Glossary of Terms, Acronyms, and Nomenclature}
1764 %\label{sglo1}
1766 %\begin{docglossaryenum}
1768 %\item \index{fTq@$f_{T_q}$}$f_{T_q}$
1770 % \cite[p. 161]{bibref:freescale:gz60a} defines $f_{T_q}$ as the
1771 % frequency of $T_q$, the atomic unit of time handled by the HSCAN
1772 % peripheral built in to the microcontroller.
1774 %\end{docglossaryenum}
1776 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1777 \clearpage{}
1778 \addcontentsline{toc}{section}{References}
1780 \begin{thebibliography}{000}
1781 \bibitem{bibref:vendor:dynex}
1782 \emph{Dynex},\\
1783 \texttt{http://www.dynexproducts.com}
1784 \bibitem{bibref:vendor:futurelec}
1785 \emph{Futurelec},\\
1786 \texttt{http://www.futurelec.com}
1787 \bibitem{bibref:twp:ms810467}
1788 \emph{Serial Communications in Win32},\\
1789 \texttt{http://msdn.microsoft.com/en-us/library/ms810467.aspx}
1790 \bibitem{bibref:swlic:gpl}
1791 \emph{GNU General Public License},\\
1792 \texttt{http://www.gnu.org/licenses/licenses.html}
1793 \bibitem{bibref:osws:sourceforge}
1794 \emph{SourceForge},\\
1795 \texttt{http://www.sourceforge.net}
1796 \bibitem{bibref:i:daveashley}
1797 David T. Ashley,\\
1798 \texttt{dashley@gmail.com}
1799 \bibitem{bibref:swp:slickedit}
1800 \emph{SlickEdit},\\
1801 \texttt{http://www.slickedit.com}
1802 \bibitem{bibref:swp:realterm}
1803 \index{Realterm@\emph{RealTerm}}\emph{RealTerm},\\
1804 \texttt{http://realterm.sourceforge.net}
1805 \end{thebibliography}
1807 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1808 \clearpage{}
1809 \addcontentsline{toc}{section}{Index}
1810 \printindex
1812 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1813 \end{document}
1814 %
1815 %$Log: man20081211a.tex,v $
1816 %Revision 1.20 2009/01/17 22:17:01 dashley
1817 %Edits.
1818 %
1819 %Revision 1.19 2009/01/17 20:08:12 dashley
1820 %Edits.
1821 %
1822 %Revision 1.18 2009/01/17 05:25:40 dashley
1823 %Edits.
1824 %
1825 %Revision 1.17 2009/01/17 04:28:05 dashley
1826 %Edits.
1827 %
1828 %Revision 1.16 2009/01/17 01:09:00 dashley
1829 %Edits.
1830 %
1831 %Revision 1.15 2009/01/16 21:32:38 dashley
1832 %Edits.
1833 %
1834 %End of $RCSfile: man20081211a.tex,v $.
1835 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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