Midi clock sysex doesn't work on XL

[MisterE]

I used sysex messages to set the tempo for each song because of the problems with sending a continuous clock signal from the Gordius.
It seems that with the XL this doesn't work anymore.
This was the code:
F0 00 01 74 03 02 0D 01 20 00 1E 00 00 01 37 F7 30BPM
The identifier is still the same.
So something else must have changed

 

[AlGrenadine]

The model id is nomore 03 but 06

 

[MisterE]

Thanks Al.
But because the Id changed, the checksum has changed as well and I don't know how to calculate it.

 

[javajunkie]

The checksum is derived by XORing every byte from the start of the SysEx message, up to the character before the terminating F7 byte.

 

[javajunkie]

Try F0 00 01 74 06 02 0D 01 20 00 1E 00 00 01 32 F7

 

[MisterE]

That should give a tempo of 30
I figured that out using a midi monitor on my Gordius
Now only 159 tempos to go :mrgreen

 

[javajunkie]

Wiki Will Help:

MIDI SysEx - Axe-Fx II Wiki

 

[MisterE]

Thanks Java
But I already had that page in my favourites
But it doesn't explain how to calculate it and turn it into hex code without any programming skills
I googled for an XOR calculator program but couldn't find any.
So I'll have to do it the slow and tedious way

 

[AlGrenadine]

You can also try to understand the code of axeloader made by tgunn, everything is inside
Btw, it would be very cool if FAS would support 3rd party developers

 

[AlGrenadine]

Here is wonderful tgunn's code :https://code.google.com/p/afx2lg/

 

[PALYGAP]

From the MidyAX code, but might actually come from mTroll or some other shared code, can't remember.


byte Calculate_CheckSum( byte *cur_sysex, int cur_size)
{
byte result = 0xF0;
for(int j=0; j < cur_size ;j++)
{
result = result ^ cur_sysex[j];
}
result = result & 0x7F;
return result;
}

cur_sysex : byte array of size at least cur_size
cur_size : size of the message to send (payload) with the CheckSum but without start (0xF0) and end (0x7F) of SYSEX message
return : CheckSum byte

Hopes that helps

 

[javajunkie]

Thanks Java
But I already had that page in my favourites
But it doesn't explain how to calculate it and turn it into hex code without any programming skills
I googled for an XOR calculator program but couldn't find any.
So I'll have to do it the slow and tedious way

Use the windows calculator in programming mode (I'm sure Mac has a similar thing). Set it to Hex. XOR the numbers together and do an And 7F at the end to strip the left most bit.

 

[MisterE]

Hed to do it the old fashioned way with my Gordius and some elbow grease.
XL-Tempo Sysex