Do extra filtering in H300 (and H100) main unit button reading to suppress wrong readings during voltage transitions. * Optimised multi-button ADC reads to use a balanced binary tree with an initial check for 'any button' to determine the pressed button. * The iriver button driver wouldn't have detected main unit (ADC-connected) buttons as long as remote buttons (ADC-connected) were pressed (btn = value; vs. btn |= value), * Do extra filtering in the recorder v1 OFF button read, to suppress spurious OFF events. * Some more tweaks.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9530 a1c6a512-1295-4272-9138-f99709370657