* shifter: simplify API surface and use build directive to directly match the PyBadge Signed-off-by: Ron Evans <ron@hybridgroup.com> * shifter: further simplify API for PyBadge Signed-off-by: Ron Evans <ron@hybridgroup.com>
this doesn't break existing code, but it might no longer work as expected
* shifter: added generic 8bit shift register driver with ShiftPin Pin-compatible GPIO interface