<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>This is awesome! to fixate on one detail, that is not related to
the IHU..........I'm very interested in the AX5043 (particularly
the native HDLC features, which sound suspiciously close to AX.25
with a little help from the Pi/MCU). Will the Raspberry Pi dev
board / reference code also be on github at the link provided?
any ETA for that? Does that already exist somewhere on github?</p>
<p><br>
</p>
<p>Thanks!</p>
<p>-Zach, KJ4QLP<br>
</p>
<pre class="moz-signature" cols="72">Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305</pre>
<div class="moz-cite-prefix">On 6/5/2018 11:54 AM, Michelle Thompson
via Ground-Station wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACvjz2VGTtGmuV1qusZhbfk9QNaVyLDVL2YJo=sud4or-cfw7A@mail.gmail.com">
<div dir="ltr">
<div>
<div class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div>A conference call was held on 31 May
2018. Presenting was Jonathan Brandenburg,
concerning his IHU project that he wishes to
publish. </div>
<div><br>
</div>
<div>Open Research Institute will support
publishing this open source Integrated
Housekeeping Unit (IHU) design intended for
amateur radio satellite service payloads. An
IHU is a flight computer, controlling all
the elements of the payload.</div>
<div><br>
</div>
<div>The call was held courtesy of National
Instruments conference bridge. Thank you to
Neel Pandeya for making it possible and for
supporting open source hardware and software
designs. </div>
<div><br>
</div>
<div>The design team for this IHU consists of
Zach Metzinger, Jordan Trewitt, Bill Reed,
and Jonathan Brandenburg. This started in
earnest about a year ago. It it not
radiation hardened by design, but is
entirely appropriate for low earth orbit
(LEO) use. </div>
<div><br>
</div>
<div>Initial design work was presented at the
2017 AMSAT Symposium. </div>
<div>This is a failover IHU design. It was two
fault-tolerant processors. The processor is
TI Hercules and the part number is
TMS570LS0914PGE. Each processor has two
cores, and each core operates in lock-step.
There is some flight heritage with this part
from the ICI Radar Satellite and a NASA
Robotic ARM. </div>
<div><br>
</div>
<div>Included in the design are twin
transceivers. The transceiver selected is
the AX5043.</div>
<div><br>
</div>
<div>A power amplifier design is in progress. </div>
<div>There is error correction on the
memories. </div>
<div>This IHU has two “sides”, with one
Hercules and one transceiver on each side.
There is diversity in the voltage
regulators, with the primary side powered by
a MAX1556A regulators and a secondary side
powered with LTI963As. The diversity in
voltage regulators is intended to provide
additional resilience. For each side, there
is a 3.3volt rail and a 1.2volt rail.</div>
<div><br>
</div>
<div>Software development has only just begun.
Layout is approximately 80% complete. </div>
<div><br>
</div>
<div>The board has 4 layers and relatively
good power consumption based on prototype
measurement. </div>
<div><br>
</div>
<div>UPSat from Libre Space was also
introduced and referenced.</div>
<div><br>
</div>
<div>OreSat is interested in collaborating and
learning more about this design.</div>
<div><br>
</div>
<div>Our consensus is CANbus or Ethernet for
flight hardware.</div>
<div><br>
</div>
<div>Jonathan has also made a Raspberry Pi
daughterboard for the AX5043. This allows
development with the transceiver independent
of the Hercules or IHU. </div>
<div><br>
</div>
<div>The drawbacks to the Hercules include
terrible documentation and a cumbersome
parameterized code generation process for
development. Jonathan believes he is getting
a handle on this and there is the
possibility of him producing improved
documentation for this design. </div>
<div><br>
</div>
<div>We also discussed the VA10820 - Radiation
Hardened ARM® Cortex®-M0 MCU <a
href="https://www.voragotech.com/products/va10820"
moz-do-not-send="true">https://www.voragotech.com/products/va10820</a>.
This is approximately $700, but has good
stats and a well-documented toolchain. There
is at least one design that is open source
that could be used as a basis for an IHU. </div>
<div><br>
</div>
<div>Jonathan to publish the IHU at <a
href="https://github.com/phase4space/payload-IHU"
moz-do-not-send="true">https://github.com/phase4space/payload-IHU</a></div>
<div>Jonathan and Michelle to press for review
of the design.</div>
<div><br>
</div>
<div>Michelle to publish minutes.</div>
<div><br>
</div>
<div>Michelle to arrange for additional IHU
conference calls. </div>
<div><br>
</div>
<div>Microsemi’s SmartFusion2 and PolarFire
devices were brought up outside of the
meeting. They are actively advertising
radiation hardening for these parts and they
may be available now and should be
discussed. </div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<!--'"--><br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Ground-Station mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Ground-Station@lists.openresearch.institute">Ground-Station@lists.openresearch.institute</a>
<a class="moz-txt-link-freetext" href="http://lists.openresearch.institute/mailman/listinfo/ground-station">http://lists.openresearch.institute/mailman/listinfo/ground-station</a>
</pre>
</blockquote>
<br>
</body>
</html>