[sdiy] FW: Simple MIDI Seq for firmware updates

[Jerry Gray-Eskue]

<<I don't think a handshake is possible if I use a SysEx loader like MidiOx
or
a sequencer to play MID files.  Right?>>

Maybe, I have not worked with MidiOx but the description says:

"it is both a diagnostic tool and a System Exclusive librarian."
" It displays incoming MIDI streams,"

It may be possible to manually send each block and see the status in the
display of incoming streams.
You have 7 bit data to work with so you may be able to use text in the
handshake ( Good / Bad ) and see it in the display.
-----------
They also mention "MIDI-OX Scripting" so you may be able to automate the
whole process - handshakes and all with a script.
-----------
Yet another possibly is "As of version 4.6, a new COM Interface has been
implemented." Your Borland compiler may support using COM.
-----------




-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of MTG
Sent: Friday, March 12, 2010 11:01 PM
To: Synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] FW: Simple MIDI Seq for firmware updates


> Boot loaders are a bit tricky, you need to know the image is not corrupted
> and need to be able to roll back to the original boot loader in the case
> of
> a programming flaw, incomplete program update, memory corruption etc. A
> simple way to do this using a protected (hardware write protection is
> best)
> boot loader that is always in place, the system starts the boot loader
> runs
> a checksum on the image and looks for an abort load signal of some sort.
> The
> abort signal can be a jumper or other message. If there is no abort signal
> received the loader executes the program.

Thanks for the good tips above and below.  I have a bootloader working well
over RS232, but for obvious reasons I don't want to have people pull out a
DB9 cable. Also, I don't really want to write a MIDI app of my own at this
time because that would be a steep hill to climb right now (unless someone
has a great Borland MIDI component). But I digress...

> Now using MIDI System Exclusives is not hard, and its function is open
> ended.
> For the handshake your target system can Send a System Exclusive message
> block of its own. A MIDI receiver is also allowed to act as a MIDI
> transmitter.

I don't think a handshake is possible if I use a SysEx loader like MidiOx or
a sequencer to play MID files.  Right?

GB

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