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  • Author Author: phoenixcomm
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Sizing an  embedded microprocessor

phoenixcomm

Dah Rules!

  • The selected processor must support all of the I/0 natively ie. no I/O Expanders.
  • There are more out there, but I own these, with the exception of the Pi.
  • The processors to be in the selection are:
    • Ardunio Duemilanove
    • Ardunio Mega
    • TI Stellaris Launchpad
    • Raspberry Pi
    • Beagle Bone
  • The Solution must be integrated with the Radio SubSystem or RSS.
  • There must be two sets of protocols developed.
    • Between the Control Head and the embedded processor.
    • Between the embedded processor and the RSS.

 

PRODUCTCPUSPEED MhzSIZE BytesProto BrdGPIOPWMUSBRAMOSDEVELOPMENTCOSTTOTAL

PASS /

FAIL

DuemilanoveATmega328168Y  $1614- 6Y32 KbWireWire$30$46FAIL 1
MegaATmega2560168Y  $1554- 14Y256 KbWireWire$30$45

PASS

4

StellarisARM Cortex-M48032Y  $2043
Y

32 kb +

256 Kb

Optional

CSS5 / Eclipse

ANSI C

$13$33PASS 5
PiARM-11 BCM283570032Y  $16

Y
Downloadable
$35$51

PASS

3

BoneARM Cortex-A870032Y  $30

Y

Linux Angstrom

Eclipse$89$119FAIL 2

 

The Winners and Losers and Why?!

  1. Does not have enough I/O.
  2. Cost too much for a small job.
  3. I feel the Pi is over kill in this situation. But you might like it.
  4. The Mega has all of the power that you need.
  5. The Stellaris is my personal choice but, its a little heavy handed.

 

image keep tuned in more to come

Cris ~

  • in reply to DAB

    I guess I was not clear enough. I said, that the ardunio Mega will do for the project, and my personal choice was the launchpad. That means I am going to use the Mega.

    Also as radios are what I call "low power requirement" that is in the performance the AVR ardunio will work fine. I have 6 radios, com 1 & 2 & 3, nav 1 & 2, adf but I would like the ATC transponder as well. Other radios are TCAS, SELCAL.

    Remember all the CPU does is read the switches and decode the ARINC 410 to ANSI and sending this data to the HOST. They also receive data as well as to turn on dial lights, and other indicators, meters etc. As well as sending signals to any of the Flight Instruments FLAGS. I guess my next article will be on the RSS as a whole so my readers will understand how it works and why.

    Thxs

    Cris.

  • Without doing my own analysis I would say your selection makes sense.

     

    I also commend you for doing your selection based upon your requirements.  A lot of people fall into the trap of just comparing the candidates against each other.  You did it the right way by making sure each candidate did or did not meet your needs.  After that, you can look at the passing options to decide which best fits your need.

     

    One additional advantage of the Stellaris, assuming you are using a Launchpad as your base is that it is smaller and lighter.

     

    I look forward to seeing your design and integration of the functions into the Stellaris.

     

    Meanwhile, have fun with your build.

     

    DAB