[sdiy] MIDI State Machine diagram - please comment

[Neil Johnson]

Hi John,

> http://mysite.verizon.net/jspeth/MIDI_FSM.pdf

- In your "status unknown" state you don't handle System Realtime  
messages, while you do in other states.

- Why treat Note On and Note Off differently?  They have the same  
structure, just different status byte.  As Achim suggests treat them  
the same, and then interpret the collection of three bytes later on -  
its also much easier to pick up on the 0-velocity note-off command.

- In the Sysex state what do you do if you receive a status byte  
other than EOX?  The official line is to abort the sysex.  Specific  
to your diagram, what if a Note On status byte terminates a sysex?

- What about all the other MIDI messages?  There is lots of useful  
information coming across the MIDI cable.  Seems odd to support Sysex  
but ignore pitchbend or even mod.wheel.

- No mention of channel filtering for the note messages.  Are you  
supporting OMNI ON mode only?

Look forward to seeing the update!

Cheers,
Neil
--
http://www.njohnson.co.uk