[Trac #477] Improvement needed in Gamepad Buttons

[Zarro Boogs per Child]

#477: Improvement needed in Gamepad Buttons
----------------------+-----------------------------------------------------
 Reporter:  mfoster   |       Owner:  mfoster
     Type:  defect    |      Status:  new    
 Priority:  high      |   Milestone:  BTest-2
Component:  hardware  |    Keywords:         
----------------------+-----------------------------------------------------
 Hi, Folks,

 We're not satisfied with the current gamepad implementation on the B1
 units. The problems here are threefold. First, the implementation of the
 left gamepad controller needs a bit of tweaking to ensure consistency
 across all units (we currently see a failure rate of ~2.5% on the gamepad
 switches).  Second, the electrical design of the current gamepad buttons
 should be enhanced for N-Key rollover, which means that it will be
 possible to depress "many" buttons simultaneously without generating
 "ghost" / false button triggering.  Finally, the EC's scanning logic for
 the gamepad buttons is currently broken - simple firmware enhancements are
 required to implement the gamepad scanning logic properly.

 All of these features should be implemented in the B2 build.

-- 
Ticket URL: <http://dev.laptop.org/ticket/477>
One Laptop Per Child <http://laptop.org/>