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Messages - lokki

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1
PreenFM2 / Re: Octatrack and Preen Combo Change
« on: June 05, 2018, 01:04:50 AM »
and i have still not uploaded my latest firmware source to GitHub... will try to do that soon.

2
PreenFM2 / Re: Octatrack and Preen Combo Change
« on: June 04, 2018, 12:08:52 AM »
maybe not the answer you are looking for, but i have made a custom extended firmware, where you can choose in the global menu what incoming program messages should do, change banks/combos etc. maybe that would be an option? you find it in the custom extended firmware thread...

3
PreenFM2 / Re: dfu mode linux error
« on: May 29, 2018, 01:00:13 PM »
i solved it by removing the usb-stick (pain in the a**) because you have to open the case. i then uploaded the new firmware directly to the stick (usb-stick mode in bootloader was also not working)

after reinserting the stick i got a "bootloader ok, but no firmware installed" screen and i was able to boot to bootloader and flash the new firmware. now i am again able to flash via dfu mode...

this seems odd and weird.

4
PreenFM2 / dfu mode linux error
« on: May 29, 2018, 10:19:56 AM »
hi xavier,

on one of my preenfm2 (i have 2) i can no longer upgrade the firmware via dfu mode, i get this error:

Code: [Select]
lokki@linuxmint ~/preenfm2-8monocurrent $ make installdfuo
dfu-util -a0 -d 0x0483:0xdf11 -D build/p2t8_208bo.bin -s 0x8040000
dfu-util 0.8

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2014 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util@lists.gnumonks.org

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Deducing device DFU version from functional descriptor length
Opening DFU capable USB device...
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuDNLOAD-IDLE, status = 0
aborting previous incomplete transfer
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 2048
DfuSe interface name: "Internal Flash  "
Downloading to address = 0x08040000, size = 412860
Download [                         ]   0%            0 bytesdfu-util: Error during special command "ERASE_PAGE" get_status
Makefile:209: recipe for target 'installdfuo' failed
make: *** [installdfuo] Error 74


and sometimes:

Code: [Select]
lokki@linuxmint ~/preenfm2-8monocurrent $ make installdfuo
dfu-util -a0 -d 0x0483:0xdf11 -D build/p2t8_208bo.bin -s 0x8040000
dfu-util 0.8

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2014 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util@lists.gnumonks.org

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Deducing device DFU version from functional descriptor length
Opening DFU capable USB device...
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: dfu-util: error get_status
Makefile:209: recipe for target 'installdfuo' failed
make: *** [installdfuo] Error 74

or even:

Code: [Select]
make installdfuo
dfu-util -a0 -d 0x0483:0xdf11 -D build/p2t8_208bo.bin -s 0x8040000
dfu-util 0.8

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2014 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to dfu-util@lists.gnumonks.org

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Deducing device DFU version from functional descriptor length
dfu-util: Cannot open DFU device 0483:df11
dfu-util: No DFU capable USB device available
Makefile:209: recipe for target 'installdfuo' failed
make: *** [installdfuo] Error 74

however lsusb shows:

Code: [Select]
Bus 001 Device 013: ID 0483:df11 STMicroelectronics STM Device in DFU Mode

which seems to indicate dfu mode is working on the preenfm side. the other preenfm updates the firmware without a problem on the exact same linux installation, same usb port and cable...

any hints on this?


5
PreenFM2 / Re: custom extended firmware
« on: May 02, 2018, 09:10:50 AM »
and the 4timbres version, also untested...

6
PreenFM2 / Re: custom extended firmware
« on: May 02, 2018, 09:10:02 AM »
here is the 8timbres version with the env fix by xavier, currently untested so let me know if it does not work properly.

7
PreenFM2 / Re: custom extended firmware
« on: April 18, 2018, 03:40:40 PM »
hey stelpa,

this time i did not see your comment!

i will update the firmware, the change seems easy enough. give me a couple of days, i am a bit busy at the moment. if you don't hear back again, don't hesitate to ask again.

cheers

8
PreenFM2 / Re: Non-linear waveshaping on the PreenFM2
« on: February 26, 2018, 11:43:01 AM »
can you post your preset?

9
PreenFM2 / Re: Volume mixer
« on: February 18, 2018, 10:12:20 AM »
well yes and no... you see, when you use a sound with less harmonics, the headroom becomes a problem pretty fast. you can hear a distorted sound on a sine VERY quickly. that is why i think it is smart to have it that way. also where would you draw the line? have it always at 16 voices (the dac setting that is) so that when you play monophonic you only use 1/16th of the dynamic range? hmm.

to circumvent your volume problem in live settings i would create at least one instrument which fills up all the voices. once you need more on the bass for example, you simply reduce on the other instrument first.

that being said, it would be relatively trivial to change this in firmware. (xavier has done this for the 8timbres version and it is just one calculation that has to be changed)

10
PreenFM2 / Re: Mystery part
« on: February 14, 2018, 05:38:52 PM »
ground. there are many places on the board where you find ground, maybe easiest is the power adapter.

11
PreenFM2 / Re: Mystery part
« on: February 13, 2018, 10:31:15 AM »
yes, this is used to keep aliens from your preenfm. just put it over the display, so they cannot read your secret patches :-)

no seriously, this is a shield that belongs between the display and the pcb, to reduce the high frequency noise that the oled display emits. see here: http://ixox.fr/forum/index.php?topic=69159.0

12
PreenFM2 / pwm
« on: January 29, 2018, 12:35:11 AM »
hi there,

i thought about extending the 2048 point square wave to add another 1024 points of "low" so that i could then change the onset (first value to be read from the array when used in an oscillator) via a matrix source. this would allow a pwm effect when square wave is selected, which can be a VERY interesting sound. it is like a speaking synth :-) (at least when i try this on the blofeld, but maybe it only works in pm synths, not true fm)

looking at the square table it is no strict 1 and 0 based square wave, it is somewhat antialiased i think.

could this be feasible?

13
PreenFM2 / Re: new matrix destination
« on: January 19, 2018, 12:54:22 AM »
haha perfect! yes for once i did look in the docs and not in the synth, since i was not home...

14
PreenFM2 / new matrix destination
« on: January 18, 2018, 03:17:08 PM »
hi xavier,

before i dive into it, is it feasible to add another matrix destination? i would like to control the release part of a sound, so i would like to adjust all the release parameters with breathcc for example.

15
PreenFM2 / Re: Problem starting PreenFM2
« on: January 14, 2018, 09:20:07 AM »
glad you got the usb sorted! screen issue is not normal. bad connection seems more likely tbh. maybe resolder those pins (on the screen and on the header) do you have a multimeter? you could check the connections and also look for shorts.

you may also post a picture of the display with the lines (so maybe xavier can debug quicker) and a picture of your soldering on the display and the display headers (so we can see possible shorts/bad joints)


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