Just one more option to take in account for communications with pwsafe. I remember[1] to some one direction communication (pc to mcu) using blinking squares on a pc monitor (of course you can also use a mobile phone) and ldr; it could be used to send info to pwsafe, and then confirm correctness of data on device. I've done a jsfiddle to show how it would be to send data to device[2]. Note that there's only a "101" as start sequence (1 means black, 0 white). And you detect the end of sending when 8x(timeout between bits) has passed with all blank.
[1]: http://dangerousprototypes.com/2011/12/13/cheap-light-based-pc-to-uc-communication/ [2]: http://jsfiddle.net/WzE4G/1/ On Wed, Sep 11, 2013 at 5:52 PM, Werner Almesberger <wer...@almesberger.net>wrote: > EdorFaus wrote: > > Or, alternately, the device could behave as if the write lock was > > off, except that all reads/writes goes to a separate jailed section > > Kinda like the journal in a journaling file system ? Yes, that > could be a possibility: collect all changes, then present the > user with a "diff" and ask whether to "commit". > > Not sure if that would be convenient with a relatively small > display, though. > > I'd envision basically the following USB protocols: > > - plain HID > - feedback over HID (via "features"): > - select account entry > - password store management > - USB storage: > - read-only mode (access to the ecrypted memory card; that would > give you a slow (Full Speed only) but "trusted" reader) > - read-write mode > - DFU to the internal Flash (for development) > > Not sure whether regular firmware upgrades should also be allowed > via DFU. In any case, they could come from the memory card. > > - Werner > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): discussion@lists.en.qi-hardware.com > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion > -- Felix
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