Check for a stop bit on serial input

Check for a stop bit on serial input to avoid flooding the
host in the event of a hardware problem.

Signed-off-by: Mark Rustad <MRustad@mac.com>
Clean up some debugging stuff

Turn off and remove some debugging code that shouldn't generally
be needed any more.

Signed-off-by: Mark Rustad <MRustad@mac.com>
Fix up gpio init script

Signed-off-by: Mark Rustad <MRustad@mac.com>
Fix up platod script

Signed-off-by: Mark Rustad <MRustad@mac.com>
Update Makefile

Signed-off-by: Mark Rustad <MRustad@mac.com>