Tenth Anniversary of NASA Dawn Launch

Jiri Gaisler jiri at gaisler.se
Thu Sep 28 19:51:34 UTC 2017

On 09/28/2017 08:19 PM, Russell Haley wrote:
> I noticed LEON 2 coming up from time to time on this mailing list.
> Forgive me because I know only a little about this subject so far.
> What is the advantage of running an FPGA/software processor over
> hardware? Is there an advantage in space?

For this particular application, the main advantage is that the used
LEON2 is free and open source (LGPL). The radiation hard FPGA will
protect the system from most radiation effects, but even if the system
hangs it is not mission critical and can be reset by a watch-dog or
similar. For more info on the LEON processors, you can look at Wikipedia:



> Russ
> On Thu, Sep 28, 2017 at 10:56 AM, Joel Sherrill <joel at rtems.org
> <mailto:joel at rtems.org>> wrote:
>     Hi
>     We made a flyer a few years back about the Dawn mission.
>     https://www.rtems.com/sites/default/files/Application-Dawn-2011-10.pdf
>     <https://www.rtems.com/sites/default/files/Application-Dawn-2011-10.pdf>
>     Looks like we don't know a lot about the framing camera we know runs
>     RTEMS beyond it being a LEON2. I recall that the  Technical
>     University 
>     of Braunschweig developed the camera but a quick google search only
>     found other RTEMS systems they had done. 
>     More information on any RTEMS application is of interest though.
>     Looking for that I was also reminded that I watched the launch on
>     the NASA channel.
>     On Wed, Sep 27, 2017 at 7:27 PM, Russell Haley
>     <russ.haley at gmail.com <mailto:russ.haley at gmail.com>> wrote:
>         What version of rtems is it running? Can you tell us any of
>         the technical details?
>         Russ
>         Sent from my BlackBerry 10 smartphone on the Virgin Mobile network.
>         *From: *Joel Sherrill
>         *Sent: *Wednesday, September 27, 2017 4:25 PM
>         *To: *rtems-users at rtems.org <mailto:rtems-users at rtems.org>
>         *Reply To: *joel at rtems.org <mailto:joel at rtems.org>
>         *Subject: *Tenth Anniversary of NASA Dawn Launch
>         Hi
>         The RTEMS Community doesn't post enough about the successes of
>         their
>         RTEMS applications so I am passing this one along. Today is
>         the 10th 
>         anniversary of the launch of the Dawn space probe.
>         https://en.wikipedia.org/wiki/Dawn_(spacecraft)
>         <https://en.wikipedia.org/wiki/Dawn_%28spacecraft%29>
>         Dawn is a mission to the asteroid belt. We have learned a lot
>         from this
>         mission. 
>         Congratulations to those who worked on this mission!
>         --joel
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