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<title>AT91 Simple project for AT91RM9200DK</title>
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<p align=center style='text-align:center'><b><span style='font-size:18.0pt;
mso-bidi-font-size:13.5pt;font-family:Arial;color:#FF6600'>AT91 Basic
project for AT91RM9200DK<o:p></o:p></span></b></p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
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<!-- ******* title ********** !-->
<P><div align="right"><A>Version: 2.0</A></div>
<p><b><i><span style='font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></i></b></p>
<p><b><i><span style='font-family:Arial'>Introduction<o:p></o:p></span></i></b></p>
<p><span style='font-size:10.0pt'>The goal of this demonstration project is to
show how to use AT91 ARM-Based Software Package and how to configure a software cross compilation
tool-chain to get a binary downloadable on an <b>AT91RM9200DK</b> board.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>This very small application sends through the DBGU serial port messages corresponding to the function name where the printing function has been invoked.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>The application binary can be downloaded using the boot program ROMed in AT91RM9200 chip. It can be downloaded:<o:p></o:p></span></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo3;tab-stops:list 36.0pt'><span style='font-size:
10.0pt'>Sending a file using Xmodem protocol through a serial link
configured to 115200 bps, no parity, 1 stop bit, no flow control.<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo3;tab-stops:list 36.0pt'><span style='font-size:
10.0pt'>Sending a file using USB DFU facility <o:p></o:p></span></li>
</ul>
<P><!-- ******* Contents ********** !-->
<div align="left"><B>Contents:</div></B><DIR>
</div> <div align="left"><A HREF="#Reference_Documents">Reference Documents</A>
</div> <div align="left"><A HREF="#Description">Description</A></div>
</div> <div align="left"><A HREF="#Source_Files">Source Files</A>
</div> <div align="left"><a href="../compil/tools.html">Compilation</A>
</div> <div align="left"><a href="AT91RM9200-Download.html">Download</a></li>
</div> <div align="left"><a HREF="#trace">DBUG Trace</a></li>
</DIR>
</P>
<!-- ******* Reference ********** !-->
<P><div align="left"><A NAME="Reference_Documents"><B>Reference Documents</A></div></B> </P><DIR>
<TABLE BORDER CELLSPACING=1 CELLPADDING=7 WIDTH=550>
<TR><TD WIDTH="80%" VALIGN="TOP">Name</TD>
<TD WIDTH="20%" VALIGN="TOP">
<FONT SIZE=2><P>Reference</FONT></TD>
</TR>
<TR><TD WIDTH="80%" VALIGN="TOP">
<FONT SIZE=2><P>ARM-Based Software Package</FONT></TD>
<TD WIDTH="20%" VALIGN="TOP">
<FONT SIZE=2><P>6016</FONT></TD>
</TR>
<TR><TD WIDTH="80%" VALIGN="TOP">ARM920T based Microcontroller AT91RM9200 Datasheet</TD>
<TD WIDTH="20%" VALIGN="TOP">
<FONT SIZE=2><P>1768</FONT></TD>
</TR>
</TR>
<TR><TD WIDTH="80%" VALIGN="TOP">AT91RM9200 Development Kit User Guide</TD>
<TD WIDTH="20%" VALIGN="TOP">
<FONT SIZE=2><P>6006</FONT></TD>
</TR>
</TABLE>
</DIR>
<p><b><i><span style='font-family:Arial'><A NAME="Description">Description<o:p></o:p></span></i></b></p>
<p><span style='font-size:10.0pt'>The main application is ridiculously simple:
it just writes main() through the DBGU serial port. This is the start-point to
write a more complex application running on an AT91RM9200.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>The startup of this application is divided in
two files: one in assembly and one in C. Assembly code tends to be as small as
possible and thus calls C functions as soon as possible.<o:p></o:p></span></p>
<table border=1 cellspacing=1 cellpadding=0 width=568 style='width:426.0pt;
mso-cellspacing:.7pt;mso-padding-alt:5.25pt 5.25pt 5.25pt 5.25pt'>
<tr>
<td width="50%" valign=top style='width:50.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p align=center style='text-align:center'><b><span style='font-size:10.0pt'>cstartup.xxx</span></b></p>
</td>
<td width="50%" valign=top style='width:50.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p align=center style='text-align:center'><b><span style='font-size:10.0pt'>init.c</span></b></p>
</td>
</tr>
<tr>
<td width="50%" valign=top style='width:50.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l4 level1 lfo6;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>The initialization sequence is:<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l4 level1 lfo6;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>Initialize stacks<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l4 level1 lfo6;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>Call AT91F_initialize<o:p></o:p></span></li>
</ul>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Initialize C variables<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Call the main function</span></p>
</td>
<td width="50%" valign=top style='width:50.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo9;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>clear all pending interrupts in the AIC<o:p></o:p></span></li>
</ul>
<p><i><span style='font-size:7.5pt'>(following can be done later in the main
application)<o:p></o:p></span></i></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo12;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>Open PIO for DBGU <o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo12;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>Enable DBGU transmission<o:p></o:p></span></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo12;tab-stops:list 36.0pt'><span
style='font-size:10.0pt'>Send a first <o:p></o:p></span></li>
</ul>
</td>
</tr>
</table>
<p><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>More complex application would configure more
things in init.c. It would configure first the APMC to run at a correct speed.
It may also configure EBI and perform a REMAP. This small application is
supposed to be run after the boot program, so the APMC is configured and the
REMAP is done.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Stacks are defined in cstartup_xxx.s. Stack
sizes corresponds to predefines set in the project makefile. Cstartup_xxx.s
must be placed at the beginning of the image.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt'>Code must be mapped at 0. (Thus REMAP must
have been performed previously).<o:p></o:p></span></p>
<p><b><i><span style='font-family:Arial'><A NAME="Source_Files">Source files<o:p></o:p></span></i></b></p>
<table border=1 cellspacing=1 cellpadding=0 width=555 style='width:416.25pt;
mso-cellspacing:.7pt;mso-padding-alt:5.25pt 5.25pt 5.25pt 5.25pt'>
<tr>
<td width="20%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><i><span style='font-size:10.0pt'>../init.c</span></i></p>
</td>
<td width="80%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><span style='font-size:10.0pt'>Includes low level functions definitions</span></p>
</td>
</tr>
<tr>
<td width="20%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><i><span style='font-size:10.0pt'>../main.c</span></i></p>
</td>
<td width="80%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><span style='font-size:10.0pt'>this is the application</span></p>
</td>
</tr>
<tr>
<td width="20%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><i><span style='font-size:10.0pt'>../compil/cstartup.xxx</span></i></p>
</td>
<td width="80%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'>
<p><span style='font-size:10.0pt'>cstartup </span></p>
</td>
</tr>
</table>
<p><b><i><span style='font-family:Arial'><A NAME="trace">DBUG Trace<o:p></o:p></span></i></b></p>
<div align="left">AT91F_LowLevelInit()
<div align="left">-I- ======================================</div>
<div align="left">-I- AT91RM9200 UART example</div>
<div align="left">-I- --------------------------------------</div>
<div align="left">-I- This application print a '.' each second</div>
<div align="left">-I- ======================================</div>
<div align="left">.........</div>
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