The table of CNF1-3 valuses used to set the CAN bus baudrate were
taken from the Seeed studio code at:

https://github.com/Seeed-Studio/CAN_BUS_Shield/

/*
  mcp_can.cpp
  2012 Copyright (c) Seeed Technology Inc.  All right reserved.

  Author:Loovee
  2014-1-16

  Contributor:

  Cory J. Fowler
  Latonita
  Woodward1
  Mehtajaghvi
  BykeBlast
  TheRo0T
  Tsipizic
  ralfEdmund
  Nathancheek
  BlueAndi
  Adlerweb
  Btetz
  Hurvajs
  xboxpro1

  The MIT License (MIT)

  Copyright (c) 2013 Seeed Technology Inc.

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
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  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
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  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
*/
