martinzw
commented
1 month ago "What exactly happened when you tried to send SYSEX messages before the "activate MIDI" message?"I got stuck :-)fun...The device hangs and has to be resetted.As i remember a simple power off/ power on got it running again.If it had bricked my THR iwould have ceased experimenting for sure.Interesting approach with the CRC of the symbol table, will try this.Perhaps there is a way to read out the table before activating, but i do not know.The Yamaha software does not read the table at all, as i know. -------- Ursprüngliche Nachricht --------Von: MDJRosenau @.> Datum: 10.03.24 20:29 (GMT+01:00) An: martinzw/THRII-direct-USB-pedalboard @.> Cc: martinzw @.>, Assign @.> Betreff: [martinzw/THRII-direct-USB-pedalboard] "Magic key" during Inquiry (Issue #4) Hello Martin I'm interested in the protocol because the Yamaha app does not run on the operating system I am using. I have a question about the "magic key" in the "activate MIDI" message: In the Windows app, there are three binary files which are obviously symbol tables of different firmware versions. I found out that the CRC-32 values of three of these files are identical to three of the "magic keys" listed in your PDF. For this reason, I think that the "activate MIDI" message is actually there to ensure that the app uses the correct symbol table if it does not read this table from the device. If this is the case, the "magic key " of future firmware versions could be calculated by calculating the CRC-32 of the symbol table. MY QUESTION: ... this would require reading the symbol table before sending the "activate MIDI" message. In your PDF you write: "Do not send any commands to the THRII before successful MIDI activation- or you get stuck!" What exactly happened when you tried to send SYSEX messages before the "activate MIDI" message? Did you brick your amplifier or did you just have to do a power-on/off reset to get the amplifier working again? I don't like to try reading out the symbol table before sending the "activate MIDI" message if I know that sending SYSEX messages before the "activate MIDI" message bricks the device... Thanks for your Answer Martin
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MDJRosenau
Hello Martin
I'm interested in the protocol because the Yamaha app does not run on the operating system I am using.
I have a question about the "magic key" in the "activate MIDI" message:
In the Windows app, there are three binary files which are obviously symbol tables of different firmware versions.
I found out that the CRC-32 values of three of these files are identical to three of the "magic keys" listed in your PDF.
For this reason, I think that the "activate MIDI" message is actually there to ensure that the app uses the correct symbol table if it does not read this table from the device.
If this is the case, the "magic key " of future firmware versions could be calculated by calculating the CRC-32 of the symbol table.
MY QUESTION:
... this would require reading the symbol table before sending the "activate MIDI" message.
In your PDF you write: "Do not send any commands to the THRII before successful MIDI activation- or you get stuck!"
What exactly happened when you tried to send SYSEX messages before the "activate MIDI" message?
Did you brick your amplifier or did you just have to do a power-on/off reset to get the amplifier working again?
I don't like to try reading out the symbol table before sending the "activate MIDI" message if I know that sending SYSEX messages before the "activate MIDI" message bricks the device...
Thanks for your Answer
Martin