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  1. Date: Sun, 12 Jun 2011 08:22:36 -0300
  2. From: Werner Almesberger <werner@almesberger.net>
  3. To: "English Qi Hardware mailing list - support, developers, use cases and fun"
  4.         <discussion@lists.en.qi-hardware.com>
  5. Subject: Re: ben-wpan: commercial description
  6.  
  7. Monkey + keyboard =
  8. >     - AVR(r) microcontroller with 32 kB flash memory (currently 24 kB
  9. >       used)
  10.  
  11. Perhaps in my worst nightmares :-) That should have been "8 kB used"
  12. (with 24 kB free for experiments).
  13.  
  14. Meanwhile, the firmware has gotten a little fatter, so it's now 9/23 kB.
  15. There is still at least one vital piece missing, namely interrupt
  16. notification. Plus, it probably makes sense to add an "intelligent"
  17. receive mode, where the firmware automatically retrieves an incoming
  18. packet and sends it along with the interrupt notification. All this
  19. may drive the size up to ~10 kB.
  20.  
  21. That's 4 kB boot loader plus 6 kB application, each with its own USB
  22. stack. Anyone who doesn't need the existing application has 28 kB to
  23. play with. If desperate, one could also get rid of the boot loader,
  24. but that's when things get messy.
  25.  
  26. So the item above should say
  27.  
  28.     - AVR(r) microcontroller with 32 kB flash memory (currently 10 kB
  29.       used)
  30.  
  31. or maybe
  32.  
  33.     - AVR(r) microcontroller with 32 kB flash memory (22-28 kB
  34.       available for experiments and future enhancements)
  35.  
  36. - Werner
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