I would be good consider more options before making a choice that breaks board compatibility again in the future.
Cristian Paul > El 22/01/2016, a las 22:24, Werner Almesberger <[email protected]> > escribió: > > A while ago I discussed the Anelok design with Bluetooth hacker Mike > Ryan, and he strongly recommended using the Nordic nRF51822 instead > of the the TI CC2543. > > The idea for the TI CC2543 is to write the lower layers of an open > BTLE stack from scratch, and at some point mix this with the upper > layers from BlueZ. > > The main benefit of this approach is that it's 100% open. The main > drawback is that it's a lot of work, especially given that the > hardware doesn't quite support the BTLE frame format, and thus would > require some creative software tweaks. > > After looking (again [1]) at the nRF51822 documentation, I'm now > reasonably confident that one could write an all-Free stack also for > this chip. But it has the added benefit that Nordic provide a > (closed) stack as well, which should help to keep the development > time for a first working prototype down. > > Another feature that may become important given recent regulatory > trends is that the nRF51822 (like the Kinetis MCUs) can be protected > against unauthorized Flash modification. I.e., one could write a > boot loader that only accepts signed binaries. The CC2543, on the > other hand, can always be fully erased and then accepts any new > firmware. > > Further advantages of the nRF51822 include that it's a Cortex M0 > (so we don't need SDCC for the ancient 8051 core of the CC2543) and > that it has enough Flash and RAM for the entire BTLE stack. That may > end up weakening the role of the cMCU, but I think any possible > optimizations there can wait until later. > > I haven't put too much work into the CC2543 so far, so the time lost > by switching RF chips again wouldn't be excessive. Of course, such a > change will still obsolete all the RF sections of the 2014/Mk2/CR2032 > boards made so far. > > [1] > http://lists.en.qi-hardware.com/pipermail/discussion/2014-April/010574.html > > Opinions ? > > - Werner > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): [email protected] > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
