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<!-- Copyright (C) 2002 Red Hat, Inc.                                -->
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<HTML
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><HEAD
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><TITLE
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>The Console Device</TITLE
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><meta name="MSSmartTagsPreventParsing" content="TRUE">
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<META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="eCos Synthetic Target"
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HREF="hal-synth-arch.html"><LINK
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REL="PREVIOUS"
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TITLE="The I/O Auxiliary's User Interface"
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HREF="synth-gui.html"><LINK
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REL="NEXT"
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TITLE="System Calls"
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HREF="synth-syscalls.html"></HEAD
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>eCos Synthetic Target</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="synth-gui.html"
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ACCESSKEY="P"
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>Prev</A
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><TD
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><A
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HREF="synth-syscalls.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="SYNTH-CONSOLE">The Console Device</H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN435"
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></A
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><H2
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>Name</H2
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>The console device &nbsp;--&nbsp;Show output from the eCos application</DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-DESCRIPTION"
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></A
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><H2
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>Description</H2
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><P
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>The eCos application can generate text output in a variety of ways,
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including calling <TT
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CLASS="FUNCTION"
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>printf</TT
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> or
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<TT
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CLASS="FUNCTION"
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>diag_printf</TT
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>. When the I/O auxiliary is enabled
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the eCos startup code will instantiate a console device to process all
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such output. If operating in text mode the output will simply go to
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standard output, or to a logfile if the <TT
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CLASS="OPTION"
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>-l</TT
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> command
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line option is specified. If operating in graphical mode the output
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will go to the central text window, and optionally to a logfile as
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well. In addition it is possible to control the appearance of the main
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text via the target definition file, and to install extra filters for
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certain types of text.
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    </P
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><P
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>It should be noted that the console device is line-oriented, not
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character-oriented. This means that outputting partial lines is not
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supported, and some functions such as <TT
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CLASS="FUNCTION"
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>fflush</TT
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> and
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<TT
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CLASS="FUNCTION"
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>setvbuf</TT
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> will not operate as expected. This
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limitation prevents much possible confusion when using filters to
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control the appearance of the text window, and has some performance
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benefits - especially when the eCos application generates a great deal
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of output such as when tracing is enabled. For most applications this
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is not a problem, but it is something that developers should be aware
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of.
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    </P
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><P
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>The console device is output-only, it does not provide any support for
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keyboard input. If the application requires keyboard input then that
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should be handled by a separate eCos device package and matching
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host-side code.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-INSTALL"
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></A
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><H2
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>Installation</H2
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><P
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>The eCos side of the console device is implemented by the
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architectural HAL itself, in the source file
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<TT
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CLASS="FILENAME"
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>synth_diag.c</TT
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>, rather than in a separate device
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package. Similarly the host-side implementation,
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<TT
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CLASS="FUNCTION"
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>console.tcl</TT
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>, is part of the architectural HAL's
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host-side support. It gets installed automatically alongside the I/O
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auxiliary itself, so no separate installation procedure is required.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-TDF"
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></A
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><H2
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>Target Definition File</H2
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><P
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>The <A
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HREF="synth-running.html#SYNTH-RUNNING-TDF"
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>target definition file</A
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>
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can contain a number of entries related to the console device. These
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are all optional, they only control the appearance of text output. If
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such control is desired then the relevant options should appear in the
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body of a <B
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CLASS="COMMAND"
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>synth_device</B
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> entry:
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    </P
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>synth_device console {
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    &#8230;
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}</PRE
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></TD
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></TR
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></TABLE
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><P
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>The first option is <B
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CLASS="COMMAND"
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>appearance</B
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>, used to control the
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appearance of any text generated by the eCos application that does not
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match one of the installed filters. This option takes the same
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argument as any other filter, for example:
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    </P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>synth_device console {
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    appearance -foreground white -background black
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    &#8230;
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}</PRE
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></TD
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></TR
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></TABLE
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><P
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>Any number of additional filters can be created with a
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<B
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CLASS="COMMAND"
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>filter</B
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> option, for example:
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    </P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>synth_device console {
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    &#8230;
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    filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
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    &#8230;
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}</PRE
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></TD
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></TR
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></TABLE
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><P
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>The first argument gives the new filter a name which will be used in
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the <A
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HREF="synth-gui.html#SYNTH-GUI-TEXT"
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>filters dialog</A
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>. Filter names
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should be unique. The second argument is a Tcl regular expression. The
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console support will match each line of eCos output against this
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regular expression, and if a match is found then the filter will be
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used for this line of text. The above example matches any line of
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output that begins with <TT
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CLASS="LITERAL"
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>TRACE:</TT
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>, which corresponds
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to the eCos infrastructure's tracing facilities. The remaining options
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control the desired appearance for matched text. If some eCos output
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matches the regular expressions for several different filters then
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only the first match will be used.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-TARGET-CONFIG"
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></A
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><H2
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>Target-side
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  Configuration Options</H2
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><P
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>There are no target-side configuration options related to the console
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device.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-ARGUMENTS"
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></A
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><H2
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>Command Line Arguments</H2
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><P
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>The console device does not use any command-line arguments.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="SYNTH-CONSOLE-HOOKS"
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></A
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><H2
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>Hooks</H2
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><P
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>The console device does not provide any hooks.
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    </P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN477"
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></A
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><H2
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>Additional Tcl Procedures</H2
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><P
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>The console device does not provide any additional Tcl procedures that
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can be used by other scripts.
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    </P
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></DIV
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HREF="synth-gui.html"
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>Prev</A
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HREF="hal-synth-arch.html"
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>Home</A
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HREF="synth-syscalls.html"
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></TD
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>The I/O Auxiliary's User Interface</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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>&nbsp;</TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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>System Calls</TD
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