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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><HEAD
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><TITLE
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>Building and Running Sample Applications</TITLE
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"><LINK
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REL="HOME"
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TITLE="eCos User Guide"
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TITLE="Programming With eCos"
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REL="PREVIOUS"
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TITLE="Testing Filters"
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REL="NEXT"
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TITLE="A Sample Program with Two Threads"
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HREF="sample-twothreads.html"></HEAD
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><BODY
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><TR
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><TH
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COLSPAN="3"
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>eCos User Guide</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="testing-filters.html"
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ACCESSKEY="P"
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>Prev</A
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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ALIGN="right"
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HREF="sample-twothreads.html"
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>Next</A
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></TD
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="CHAPTER"
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><H1
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><A
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NAME="BUILDING-AND-RUNNING-SAMPLE-APPLIATIONS">Chapter 13. Building and Running Sample Applications</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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><DT
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><A
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HREF="building-and-running-sample-appliations.html#ECOS-HELLO-WORLD"
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><SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> Hello World</A
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></DT
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><DT
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><A
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HREF="sample-twothreads.html"
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>A Sample Program with Two Threads</A
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></DT
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></DL
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></DIV
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><P
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>The example programs in this tutorial are included, along
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with a <TT
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CLASS="FILENAME"
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>Makefile</TT
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>, in the <TT
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CLASS="FILENAME"
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>examples</TT
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> directory
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of the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> distribution. The first program you will run is a <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>hello
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world</I
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></SPAN
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>-style application, then you will run a more complex
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application that demonstrates the creation of threads and the use
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of cyg_thread_delay(), and finally you will run
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one that uses clocks and alarm handlers.</P
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><P
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>The <TT
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CLASS="FILENAME"
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>Makefile</TT
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> depends on an externally
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defined variable to find the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> library and header files. This
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variable is <TT
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CLASS="LITERAL"
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>INSTALL_DIR</TT
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> and must be set to the
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pathname of the install directory created in <A
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HREF="using-configtool-windows-linux.html"
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>the Section called <I
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>Configuration Tool on Windows and Linux Quick Start</I
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> in Chapter 11</A
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>.</P
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><P
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><TT
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CLASS="LITERAL"
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>INSTALL_DIR</TT
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> may be either be set in the shell
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environment or may be supplied on the command line. To set it in the
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shell do the following in a <B
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CLASS="COMMAND"
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>bash</B
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> shell:</P
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><TABLE
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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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>$ export INSTALL_DIR=BASE_DIR/ecos-work/arm_install</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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>You can then run <B
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CLASS="COMMAND"
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>make</B
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> without any extra parameters
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to build the examples.</P
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><P
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>Alternatively, if you can do the following:</P
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><TABLE
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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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>$ make INSTALL_DIR=BASE_DIR/ecos-work/arm_install</PRE
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></TD
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></TR
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></TABLE
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="ECOS-HELLO-WORLD"><SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> Hello World</H1
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><P
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>The following code is found in the file <TT
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CLASS="FILENAME"
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>hello.c</TT
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>
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in the <TT
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CLASS="FILENAME"
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>examples</TT
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> directory: </P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN835"><SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> hello world program listing</H2
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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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>/* this is a simple hello world program */
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#include &lt;stdio.h&#62;
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int main(void)
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{
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 printf("Hello, eCos world!\n");
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 return 0;
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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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>To compile this or any other program that is not part of the
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<SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> distribution, you can follow the procedures described below. Type
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this explicit compilation command (assuming your current working
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directory is also where you built the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> kernel):</P
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><TABLE
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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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>$ <TT
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CLASS="REPLACEABLE"
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><I
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>TARGET-</I
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></TT
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>gcc -g -I<TT
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CLASS="REPLACEABLE"
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><I
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>BASE_DIR</I
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></TT
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>/ecos-work/install/include hello.c -L<TT
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CLASS="REPLACEABLE"
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><I
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>BASE_DIR</I
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></TT
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>/ecos-work/install/lib -Ttarget.ld -nostdlib</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 compilation command above contains some standard GCC
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options (for example, <TT
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CLASS="OPTION"
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>-g</TT
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> enables debugging), as well
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as some mention of paths
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(<TT
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CLASS="OPTION"
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>-I<TT
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CLASS="REPLACEABLE"
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><I
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>BASE_DIR</I
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></TT
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>/ecos-work/install/include</TT
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> allows files
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like <TT
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CLASS="FILENAME"
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>cyg/kernel/kapi.h</TT
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> to be found, and
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<TT
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CLASS="OPTION"
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>-L<TT
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CLASS="REPLACEABLE"
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><I
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>BASE_DIR</I
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></TT
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>/ecos-work/install/lib</TT
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> allows the linker to
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find <TT
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CLASS="OPTION"
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>-Ttarget.ld</TT
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>). </P
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><P
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>The executable program will be called <TT
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CLASS="FILENAME"
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>a.out</TT
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>. </P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>Note: </B
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>Some target systems require special options to be passed to
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gcc to compile correctly for that system. Please examine the Makefile
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in the examples directory to see if this applies to your target.</P
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></BLOCKQUOTE
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></DIV
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><P
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>You can now run the resulting program using GDB in exactly the
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same the way you ran the test case before. The procedure will be the
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same, but this time run
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<B
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CLASS="COMMAND"
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><TT
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CLASS="REPLACEABLE"
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><I
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>TARGET-</I
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></TT
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>gdb</B
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> specifying
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<TT
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CLASS="OPTION"
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>-nw a.out</TT
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> on the command line:</P
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><TABLE
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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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>$ <TT
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CLASS="REPLACEABLE"
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><I
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>TARGET-</I
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></TT
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>gdb -nw a.out</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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>For targets other than the synthetic linux target, you should
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now run the usual GDB commands described earlier. Once this is done,
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typing the command "continue" at the (gdb) prompt ("run" for
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simulators) will allow the program to execute and print the string
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"Hello, eCos world!" on your screen.</P
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><P
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>On the synthetic linux target, you may use the "run" command
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immediately - you do not need to connect to the target, nor use the
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"load" command.</P
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></DIV
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></DIV
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HREF="ecos-user-guide.html"
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>Testing Filters</TD
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>A Sample Program with Two Threads</TD
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