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<meta name="author" content="Peter Vranken">
<title>DEVKIT-MPC5748G — Open Source Toolchain Support for a low-cost multi-core PowerPC Evaluation Board</title>
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<body class="article toc2 toc-left">
<div id="header">
<h1>DEVKIT-MPC5748G — Open Source Toolchain Support for a low-cost multi-core PowerPC Evaluation Board</h1>
<div class="details">
<span id="author" class="author">Peter Vranken</span><br>
<span id="email" class="email">mailto:Peter_Vranken@Yahoo.de</span><br>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_introduction">Introduction</a></li>
<li><a href="#_the_samples">The samples</a>
<ul class="sectlevel2">
<li><a href="#_startup">startup</a></li>
<li><a href="#_safe_rtos"><span class="image"><img src="samples/safe-RTOS/doc/manual/theme/iconSafeRTOS-asColoredIcon.jpg" alt="iconSafeRTOS asColoredIcon" width="3%"></span> safe-RTOS</a></li>
<li><a href="#_can">CAN</a></li>
<li><a href="#_tcp">TCP</a></li>
</ul>
</li>
<li><a href="#_installation">Installation</a></li>
<li><a href="#_documentation">Documentation</a></li>
</ul>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_introduction">Introduction</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This project aims at supporting the software development for the NXP PowerPC
microcontroller MPC5748G with professional yet free of charge software
development tools. It’s not difficult to find a GNU C cross compiler for the
PowerPC architecture in the Internet but as a matter of experience it’s
quite cumbersome to make it produce a flashable and running piece of code.
Furthermore, if we have produced such a binary file then it’s still
another matter to flash it and to find and setup a debugger to step through
it.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="doc/DEVKIT-MPC5748G/DEVKIT-MPC5748G.jpg" alt="DEVKIT-MPC5748G" width="80%">
</div>
<div class="title">Figure 1. The NXP evaluation board DEVKIT-MPC5748G</div>
</div>
<div class="paragraph">
<p>None of these tasks can be solved in general. There are too many
dependencies on the host machine, the tool revisions, the specific chip
from the PowerPC family and the hardware board it is mounted on. Any
imaginable configuration of these will need particular investigation and
specific solutions. This project focuses on a single such configuration
and offers a clean, professional level solution for that one. It might be
possible or not possible, more or less difficult or more or less effortful
to migrate this solution to other revisions or ports of GCC or other
derivatives from the microcontroller family but this is considered your
responsibility and out of scope of this project.</p>
</div>
<div class="paragraph">
<p>An important exception is the choice of the host machine. We don’t expect
problems with Linux. GCC is anyway a native UNIX tool, Cygwin is obsolete
by nature, the NXP S32 Design Studio for Power Architecture (S32DS) is
available for Linux, too, and the makefiles used in this project have been
designed to run under Linux. Please note, that this has not been tested
yet.</p>
</div>
<div class="paragraph">
<p>The configuration for this project is:</p>
</div>
<table class="tableblock frame-none grid-all stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 66.6667%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Microcontroller</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://www.nxp.com/products/processors-and-microcontrollers/power-architecture/mpc55xx-5xxx-mcus/ultra-reliable-mpc57xx-mcus/ultra-reliable-mcus-for-automotive-and-industrial-control-and-gateway:MPC574xB-C-G">NXP PowerPC MPC5748G</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Evaluation board</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://www.nxp.com/design/development-boards/automotive-development-platforms/mpc57xx-mcu-platforms/mpc5748g-development-board-for-secure-gateway:DEVKIT-MPC5748G">NXP DEVKIT-MPC5748G</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Host</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Windows 10</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">C compiler <sup class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnotedef_1" title="View footnote.">1</a>]</sup></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://drive.google.com/drive/folders/0B_3zBh2c7LroNEFIOVlJcUVKRWc">powerpc-eabivle-4.9.4-BLD-1607</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">IDE</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://www.nxp.com/design/software/development-software/s32-design-studio-ide/s32-design-studio-for-power-architecture:S32DS-PA">NXP S32 Design Studio for Power Architecture v2.1</a></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Flash tool</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">(GNU debugger contained in S32 Design Studio)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Debugger</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">(same as flash tool)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Unix tools</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">(contained in S32 Design Studio)</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>The project presents a few code samples for this hardware and toolchain
configuration. The samples are intended to support your software
development. They are no fully elaborated, functional applications but
they offer high quality building blocks for a true application. The next
section gives an overview.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_the_samples">The samples</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_startup">startup</h3>
<div class="paragraph">
<p>The most prominent embedded sample is the blinking LED, called
<a href="https://github.com/PeterVranken/DEVKIT-MPC5748G/tree/master/samples/startup">"startup"</a>
in this project. While it is not of any use as such it does contain a lot
of reusable stuff for real development: As there is the toolchain setup
(compiler, linker, flash tool, debugger), a powerful, generic, fully
reusable makefile and a clean piece of startup code, which will suffice
for most applications. Remove the demo code from the three cores' main
functions and start writing your application but don’t loose time with
setting up your development environment.</p>
</div>
<div class="paragraph">
<p>Sample "startup" already integrates some reusable I/O drivers:</p>
</div>
<div class="paragraph">
<p>Simple but useful for your first steps is the I/O driver to access the
user LED’s and buttons on the DEVKIT-MPC5748G. Evidently, this driver is
board specific, but the others aren’t.</p>
</div>
<div class="paragraph">
<p>Most useful is the DMA based serial I/O driver, which connects the C
library’s printf function family with the virtual COM port, that is
element of the board’s USB connection. The S32 Design Studio comes along
with a suitable terminal software; just run a terminal application and
open the COM port of the evaluation board to display the printed output on
the host machine.</p>
</div>
<div class="paragraph">
<p>The System Timer Module driver (STM) can be used to measure time spans and
to add timing control to your software.</p>
</div>
<div class="paragraph">
<p>A driver for the Decorated Memory Storage Controller provides safe
core-to-core data exchange and an encapsulating and abstracting mutex
class further supports this.</p>
</div>
<div class="paragraph">
<p>The use of these I/O drivers is demonstrated by the code. All three cores
communicate with one another, considering and handling both, cache
coherency aspects and race conditions.</p>
</div>
</div>
<div class="sect2">
<h3 id="_safe_rtos"><span class="image"><img src="samples/safe-RTOS/doc/manual/theme/iconSafeRTOS-asColoredIcon.jpg" alt="iconSafeRTOS asColoredIcon" width="3%"></span> safe-RTOS</h3>
<div class="paragraph">
<p><a href="https://github.com/PeterVranken/DEVKIT-MPC5748G/tree/master/samples/safe-RTOS">"safe-RTOS"</a>
is a technically ISO 26262 compliant RTOS with a process and privileges
management concept that implements the <em>freedom-from-interference</em>
paradigm. It can be run on one or more cores. If a core decides not to run
the RTOS then it can still make use of some low-level communication
services to safely exchange data across core-boundaries.</p>
</div>
<div class="paragraph">
<p>In this sample, the I/O drivers found in sample "startup" are further
elaborated in order to meet the demands of the kernel (safety aspects).</p>
</div>
</div>
<div class="sect2">
<h3 id="_can">CAN</h3>
<div class="paragraph">
<p>Sample application
<a href="https://github.com/PeterVranken/DEVKIT-MPC5748G/tree/master/samples/CAN">"CAN"</a>
presents a CAN driver, which supports up to eight CAN devices. One of them
is externally connected to a transceiver and a connector. Connect your CAN
equipment to connector P5 of the DEVKIT-MPC5748G and try the CAN
communication.</p>
</div>
</div>
<div class="sect2">
<h3 id="_tcp">TCP</h3>
<div class="paragraph">
<p>Sample application
<a href="https://github.com/PeterVranken/DEVKIT-MPC5748G/tree/master/samples/TCP">"TCP"</a>
integrates the Internet Protocol stack <a href="https://savannah.nongnu.org/news/?group=lwip" target="_blank" rel="noopener">lwIP 2.2</a>
and demonstrates how to provide a simple Web-page or how to use TCP/IP and
UDP/IP for communication with other network nodes.</p>
</div>
<div class="paragraph">
<p>All samples are self-contained. There are some common elements, which are
(nearly) same in all samples, like startup code and makefile. It would be
natural to put them in a shared directory and reuse them across the
samples. We decided not to do so in order to make the reuse of the samples
as simple as possible. Once you have installed the tools you will be able
to copy any sample to an arbitrary local directory and either run the
makefile from the command line or use the S32 Design Studio IDE with our
Eclipse project file to build the sample. The S32 Design Studio IDE is in
either case required to flash and debug the built software.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_installation">Installation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The installation of the development tools required for a related and a
quite similar GitHub project is described in detail in Wiki page
<a href="https://github.com/PeterVranken/TRK-USB-MPC5643L/wiki/Tools-and-Installation">Tools
and Installation</a>.
Much of what is said there still holds for this GitHub project. As long as
we’ve not migrated the Wiki page to this project yet, we
recommend consulting the MPC5643L page. These are the major differences to
consider:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>The download links to the tools need to be taken from the table above
and not from the Wiki page</p>
</li>
<li>
<p>The compiler (GCC 4.9.4) is element of the S32 Design Studio and doesn’t
need to be downloaded or installed. Nonetheless, the described
customization of the startup batch file (<em>setEnv.ps1</em>) is still
required. (The actual settings may differ a bit.) The proposed setting
of environment variables enables the makefiles to compile and link the
software without using the S32DS. Moreover, even the S32DS depends on
these settings: The sample projects run the "External builder" of the
Eclipse system, which means they run the same makefiles as an external
process</p>
</li>
<li>
<p>The IDE is S32 Design Studio rather than Code Warrior. However, both
IDEs are Eclipse derivatives and much of the installation and
how-to-run-and-open-a-project is simply the same. The described
customization of the startup batch script, <em>CW-IDE.ps1</em>, needs to be
done here, too. Here, the script is called <em>S32DS-IDE.ps1</em> and the
variables to set may differ a bit</p>
</li>
<li>
<p>Debugging and flashing differs. Code Warrior uses TCL scripting and
"Target Tasks" with a
proprietary debugger. S32DS uses GNU debugger. There are no scripts for
flashing. Instead, normal Eclipse launch configurations are applied for
both. There are launch configurations for flashing and others for
debugging. Just run a dedicated flash launch configuration and the ROM
is erased and reprogrammed. Run a debug launch configuration to debug a
software previously flashed</p>
</li>
<li>
<p>The MCU used in this GitHub project supports linkage of the software in
RAM (under control of a switch in the makefile). Dedicated Eclipse
launch configurations load the compiled code into the volatile memories
and start the application. The ROM contents are not touched at all. This
concept is not found in the Code Warrior project</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_documentation">Documentation</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>The Wiki page
<a href="https://github.com/PeterVranken/TRK-USB-MPC5643L/wiki/Tools-and-Installation" target="_blank" rel="noopener">Tools
and Installation</a> of the related MPC5643L GitHub project tells more
about download and installation of the tools and how to run the samples.
(Major differences with this project are outlined above)</p>
</li>
<li>
<p>Each sample has a "readMe", which outlines the functionality and its
particular added value</p>
</li>
<li>
<p>The code and scripts are documented by source code comments</p>
</li>
<li>
<p>Most relevant documentation about the evaluation board and the
microcontroller has been collected in folder
<a href="https://github.com/PeterVranken/DEVKIT-MPC5748G/tree/master/doc">doc</a>
and much, much more can be found in the Internet</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="footnotes">
<hr>
<div class="footnote" id="_footnotedef_1">
<a href="#_footnoteref_1">1</a>. The same compiler is element of the NXP S32 Design Studio installation. You don’t need to download the compiler separately.
</div>
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