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Messages - Xavier

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1126
Thanks for the tips Xavier. I will try to follow your tips and let you know. I do not know what CPU board I have and also the PCB revision! :) How can I discover? thanks and sorry for the "newbiness" ;)

Can you attach a picture of the whole PCB ?

The PCB revision is written on it : something like "R5d ".

For the CPU board this is the preenF405 :
http://ixox.fr/shop/img/p/30-70-thickbox.jpg
And this is the CERB40 :
http://shop.microframework.eu/Images/ProductOut/Thumb256/6575/0.jpg

And don't forget to upgrade your firmware. 2.07 is the latest revision and your preenfm2 will be much more powerfull with it than it is today with the 1.06.
http://ixox.fr/preenfm2/manual/upgrade-firmware/

Xavier

1127
Hi,

What CPU board do you have? preenF405 or CERB40 ?
What is your PCB revision  ?

I would say you have a CERB40 with a faulty internal USB cable or without cable at all.
For more information about this cable, search for CERB40 in this page :
http://ixox.fr/preenfm2/build-it/the-pcb/

Best,

Xavier

1128
preenfm2 and preenfm3 / Re: Feature request?
« on: May 16, 2017, 09:37:33 AM »
Hi,

Nice to read you enjoy your preenfm2  :)
I never know how to answer to question that begins by "is it possible"....
Do you ask (1) if it's possible, (2) if it's easy to do, or (3) if i would plan to do it ?

1 - Yes it's possible, the firmware is open source.
The midi to audio conversion is done here :
https://github.com/Ixox/preenfm2/blob/master/src/midi/MidiDecoder.cpp#L286
So you have to modify the code to introduce a delay at this point. Requires a little research to do that.
Then the timers for each instrument must be added somewhere in the settings.
2 - Not very easy
3 - No. It will add some complexity in the menus and settings that is not worth it to my opinion.

Possible Alternative : for the instrument you want to introduce a delay
. Set all mix* params to 0.00
. Set a matrix row like this : env2 1.0 mix*
. Then select the modulation : "Free Env 2" like this : "<D> 0.00 5.0 No"
Where <D> is the delay before your sound will begin.

Pseudo delay effect : can be done by
. using one LFO to pan the sound in the matrix (lfo1 1.0 pan*)
. And the gate target matrix (with an other LFO twice faster) to make the sound hearable only when right or left.


1129
preenfm2 and preenfm3 / Re: Output volume vs polyphony..
« on: May 16, 2017, 09:18:44 AM »

This is how it works.
The voice mixer is 100% digital.

So it maximizes the number of actual bits for each used voice.
Same thing : instrument not used should have their number of voice set to 0 so that it does not take any room in the digital mixer.

Summary : for best resolution, only set the number of voices you really need for each instrument.

1130
preenfm2 and preenfm3 / Re: Can't save to usb
« on: May 15, 2017, 10:48:59 AM »
Thanks for the details (i've modified your subjet).
Sounds like a bug.
Don't know if it's easily fixable as the USB library is the one from STM (the MCU manufacturer).

1131
preenfm2 and preenfm3 / Re: A higher polyphony ??
« on: May 15, 2017, 10:30:52 AM »

What you describe is of course possible, but it's a LOT of work.
No i won't work on that  ;)

You can chain 2 preenfm2. But they'll have to play different instrument.
Polyphony on one instrument cannot be expanded.

Xavier

1132
preenfm2 and preenfm3 / Re: Stm32F4Discovery port
« on: May 11, 2017, 03:45:36 PM »
Hi Xavier!

Thanks for the tip. I just checked the symbol list, and found, that at 08041AC0 there is the OTG_FS IRQ handler, and thought that the 0x28041AC0 dumped PC value can be the same with a memory mapping offset. I'll try to find it with gdb, though I only used it before to debug a connected target.

Yes RAM adress in the STM32F4 is 0x20000000. So this is the same adress moved into MCU RAM !

1133
preenfm2 and preenfm3 / Re: Harsh noise at 13,5kHz from preenFM2
« on: May 11, 2017, 03:40:37 PM »
Hi,

Yes this come from the yellow OLED display.
Verify your PCB version and read carefully this :
http://ixox.fr/forum/index.php?topic=69159.0

Xavier

1134
preenfm2 and preenfm3 / Re: Stm32F4Discovery port
« on: May 11, 2017, 09:38:27 AM »
The goal of this register dump is to be able to find where the firmware crashed.
I'm away from my dev computer and I don't remember exacly the steps to debug.
The PC (program counter) value is where it crashed.

With a mix of gdb, elf binary, 'layout split' or asm, and a gdb function to go to the PC value, you should get the C++ line where it crashed.


1135
preenfm2 and preenfm3 / Re: New slippers -> no USB
« on: May 09, 2017, 02:20:58 PM »
Cool  :)
Thanks for the update...

1136
preenfm2 and preenfm3 / Re: Simulating Karplus Strong with PreenFM2
« on: May 08, 2017, 05:27:48 PM »

Thanks a lot to take the time to share what you've found  :D

1137
preenfm2 and preenfm3 / Re: Can't save to usb
« on: May 08, 2017, 05:17:31 PM »
Hi,
Could you describe with more details what you're exactly doing ?
Thanks,
Xavier

1138
preenfm2 and preenfm3 / Re: Connecting..
« on: May 04, 2017, 10:53:47 PM »

First verify you have JMP1 shorted. But if the 7805 is hot i assume it's OK.

I verified and saw you have a kit with a LCD display.
Is the LCD brighter when you switch on the preenfm ?
Have you tried to turn the contrast pot ?

Then check the different voltage as shown in the message #6 of this thread :
http://ixox.fr/forum/index.php?topic=63509.0



Xavier

1139
preenfm2 and preenfm3 / Re: Connecting..
« on: May 03, 2017, 09:22:28 PM »
Hi,

9V, + at the center, should work.
That's strange.
Check that your power supply does not provide more than that.
The 7805 is hot, but that should not be a problem.
Reverse polarity should be blocked by the diode D2.

But smoke is a problem ! Maybe a cap in the wrong polarity ?

Midi polarity is important and is explained here :
http://ixox.fr/preenfm2/build-it/the-case/

1140
preenfm2 and preenfm3 / Re: New slippers -> no USB
« on: May 03, 2017, 05:28:13 PM »
Did you check the external USB solder joins on the main PCB ?

You can order a preenF405 from the shop.
It should be compatible with your white PCB (check it's a R5 version) and you won't need a internal USB cable.
I'll get it back and reimbourse you if that does not fix anything.

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