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><TITLE
>The Console Device</TITLE
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><H1
><A
NAME="SYNTH-CONSOLE">The Console Device</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN18091"
></A
><H2
>Name</H2
>The console device -- Show output from the eCos application</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-DESCRIPTION"
></A
><H2
>Description</H2
><P
>The eCos application can generate text output in a variety of ways,
including calling <TT
CLASS="FUNCTION"
>printf</TT
> or
<TT
CLASS="FUNCTION"
>diag_printf</TT
>. When the I/O auxiliary is enabled
the eCos startup code will instantiate a console device to process all
such output. If operating in text mode the output will simply go to
standard output, or to a logfile if the <TT
CLASS="OPTION"
>-l</TT
> command
line option is specified. If operating in graphical mode the output
will go to the central text window, and optionally to a logfile as
well. In addition it is possible to control the appearance of the main
text via the target definition file, and to install extra filters for
certain types of text.
</P
><P
>It should be noted that the console device is line-oriented, not
character-oriented. This means that outputting partial lines is not
supported, and some functions such as <TT
CLASS="FUNCTION"
>fflush</TT
> and
<TT
CLASS="FUNCTION"
>setvbuf</TT
> will not operate as expected. This
limitation prevents much possible confusion when using filters to
control the appearance of the text window, and has some performance
benefits - especially when the eCos application generates a great deal
of output such as when tracing is enabled. For most applications this
is not a problem, but it is something that developers should be aware
of.
</P
><P
>The console device is output-only, it does not provide any support for
keyboard input. If the application requires keyboard input then that
should be handled by a separate eCos device package and matching
host-side code.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-INSTALL"
></A
><H2
>Installation</H2
><P
>The eCos side of the console device is implemented by the
architectural HAL itself, in the source file
<TT
CLASS="FILENAME"
>synth_diag.c</TT
>, rather than in a separate device
package. Similarly the host-side implementation,
<TT
CLASS="FUNCTION"
>console.tcl</TT
>, is part of the architectural HAL's
host-side support. It gets installed automatically alongside the I/O
auxiliary itself, so no separate installation procedure is required.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-TDF"
></A
><H2
>Target Definition File</H2
><P
>The <A
HREF="synth-running.html#SYNTH-RUNNING-TDF"
>target definition file</A
>
can contain a number of entries related to the console device. These
are all optional, they only control the appearance of text output. If
such control is desired then the relevant options should appear in the
body of a <B
CLASS="COMMAND"
>synth_device</B
> entry:
</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>synth_device console {
…
}</PRE
></TD
></TR
></TABLE
><P
>The first option is <B
CLASS="COMMAND"
>appearance</B
>, used to control the
appearance of any text generated by the eCos application that does not
match one of the installed filters. This option takes the same
argument as any other filter, for example:
</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>synth_device console {
appearance -foreground white -background black
…
}</PRE
></TD
></TR
></TABLE
><P
>Any number of additional filters can be created with a
<B
CLASS="COMMAND"
>filter</B
> option, for example:
</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>synth_device console {
…
filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
…
}</PRE
></TD
></TR
></TABLE
><P
>The first argument gives the new filter a name which will be used in
the <A
HREF="synth-gui.html#SYNTH-GUI-TEXT"
>filters dialog</A
>. Filter names
should be unique. The second argument is a Tcl regular expression. The
console support will match each line of eCos output against this
regular expression, and if a match is found then the filter will be
used for this line of text. The above example matches any line of
output that begins with <TT
CLASS="LITERAL"
>TRACE:</TT
>, which corresponds
to the eCos infrastructure's tracing facilities. The remaining options
control the desired appearance for matched text. If some eCos output
matches the regular expressions for several different filters then
only the first match will be used.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-TARGET-CONFIG"
></A
><H2
>Target-side
Configuration Options</H2
><P
>There are no target-side configuration options related to the console
device.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-ARGUMENTS"
></A
><H2
>Command Line Arguments</H2
><P
>The console device does not use any command-line arguments.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SYNTH-CONSOLE-HOOKS"
></A
><H2
>Hooks</H2
><P
>The console device does not provide any hooks.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN18133"
></A
><H2
>Additional Tcl Procedures</H2
><P
>The console device does not provide any additional Tcl procedures that
can be used by other scripts.
</P
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