eptheca
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Posts posted by eptheca
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I have checked that :(
The values I got are straight from J11E on the STM32F4 Core with a 220 Ohm resistor from Vd and one from MO4 (and the other 3 MIDI OUT)
I have even tested 3 different DISCO boards with different revs.
The MIDI OUT 4 from UART5 on PC12 is "hotter" than the other 3
I wonder if this is because it shares pin with this on-board function: PC12 CS43L22 (Audio DAC) SDIN
TK, could you confirm / explain this when you have time :)
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Ok, done some testing.
MIDI thru makes no difference, same result.
When I measure between M+ and M-, on all other MIDI OUT pins its about 0,9V, but on MO4 its 2V.
This must have something to do with it.
Does anybody know why this is? Is it a bug/fault or by design? Can it be changed?
I guess it's not a problem for most situations, and my computer can read the MIDI messages, but for some uses like MB SID it's a problem.
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7 minutes ago, latigid on said:
Separate the power/grounds of the devices. With an optoisolated input, this shouldn't be a problem, but often loops can cause issues.
Do you mean that I should connect the two power supplies to different wall sockets?
The power supplies are not earthed/grounded.
11 minutes ago, latigid on said:Try to buffer O4 through another MIDI device, if it works then the problem is electrical.
I'll see if I can find a unit with MIDI thru.
If it works, and the problem is electrical, what does that mean?
1 hour ago, latigid on said:Disable your second quad I2C module by defining fewer ports in the SEQ app (and disconnecting the second module). It could be that the increased latency causes timing mismatches.
OK, that should be easy to test
Thanks :)
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I have tried 088 as well, and it's the same problem, so I don't think it's a bug.
I thought the MIDI OUTs where 5V?
QuoteJ 11 E
"This port provides four MIDI IOs at ca. 5V level (the pin is configured in open-drain mode, so that a resistor connected between the MOx pins and 5V can pull the output level to 3V or 5V. Normally this pull-up resistor is not required if an opto coupler is used at the receiver side)
Interface to the MBHP_MIDI_IO breakout board."What is this pull up resistor that is mentioned here?
Is this something I should add?
The strange thing is that it only affects OUT 4, and only MB SIDs
Is it possible to measure the output with a multimeter?
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SEQ V4 (STM32F4) 092
MIDI OUT 4 is not working with MB SID.
All other MIDI OUT from the MIDI_IO modules and the two Quad IIc are working fine with the MB SID, but for some strange reason not OUT 4
I have tested it with both MIDI-OX and Send SX, and normal MIDI messages are sent like clock and note on and off.
Is there a reason that the UART for MIDI OUT 4 should not work with MB SID?
I have 4 different MB SID V2, 2 are sammichSIDs and I have the same problem with all. They don't work on MIDI OUT 4, but work fine on all the other OUTs, and other synths seem to work on OUT 4, and the MIDI messages looks fine.
I have even tried with a different DISCO board, and checked all connections with a multi meter. Same problem and no bad connections.
?????
I just don't get it
Any suggestions anyone?
Cheers Hal
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Hi,
Does anybody know if it possible to disable the LED matrix? and in case, how?
Also, does the sammichSID need any special configuration for 6581 chips in the setup, like the standard SID V2
;; select default filter calibration value ;; expecting 12bit values (0..4095) ;; will be overwritten by ensemble setting - this is only used as default value for BankStick initialisation! #define DEFAULT_FILTER_CALI_MIN 0 #define DEFAULT_FILTER_CALI_MAX 4095Cheers, Hal
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I have re-cased my SEQ in a Pelican-style plastic case.
Added a AOUT_NG with 8 CV and 8 Triggers
Connected MIDI OUT 1-8 to a DB9 D-Sub connector for easy connection to the other half of the case which will contain the synths.
Made a USB Micro cable with a switch to ground pin 4 for USB Host Support (OTG) as suggested by Yogi
Connected the cable to a female USB A socket so I can connect a MIDI keyboard or a GM5 for 4 more MIDI OUT (total of 16 direct outs)
With a USB A-A cable I can connect it to my computer for updates etc.
The extra USB socket is just 5V for a gooseneck light
Thought a case like this deserved a "Nuclear Football" key power switch :)
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For the SID with PIC 18F4685 the LCD have to run in 4-bit mode.
Use this diagram http://www.ucapps.de/mbhp/mbhp_lcd_4bit_mios8.pdf
For the buttons and encoder, use this http://www.ucapps.de/midibox_sid_cs/mbsid_v2_din_default.pdf
Ribbon cable is fine for MIDI
For Audio, it depends on how far away from the SID module you are stretching the wires, and what other wires or circuits the wire pass on the way. For best results, use a shielded audio wire.
Good luck :) I have built 3 MBSID's
Pics would be nice
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Sounds great. Really liked this one.
Is it the Erica Synths Polivoks filter?
#dawless
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It just says you should double check before you order anything. Some settings in CAD software could change line weights etc.
To add your corner screw holes, use the FPD file, add them, and export to DXF.
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Yes, It's a vector file, not just a bitmap file. The DXF exporter in FPD is accurate to 0,01 mm or 0,0001 inch. You don't need anything more accurate than that.
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On 22.12.2016 at 4:36 AM, tassadar said:
Hi brains trust
I
havehad a functioning sammichSID with MIOS 1.9g installed - and have screwed up something when updating it to 2.044.Previously, MIDI was communicating with the core in MIOS Studio. I then uploaded setup_sammich_sid.hex from midibox_sid_v2_044.zip. The upload got to 100% successfully (though, I think it said errors were detected, but they were resolved). On resetting, the display now shows nothing, except garbled characters briefly after 2 seconds. I cannot find the core in MIOS Studio anymore!
How can I resolve this?
Hi tassadar,
According to the Changelog you should have updated MIOS first to V1.9h before installing SID V2.044.
This version got an improved rotary encoder handling.
Please update to MIOS V1.9h before uploading the application, otherwise the improvements
won't be effective.If I were you, I would update to MIOS V1.9h and then install SID V2.044 again.
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Hi folks,
I can confirm that the latest FW update from ST, M16 works great for the "new boards" MB997D
No need to remove the resistor and bridge from the board to power it from the Micro-USB :)
Get the latest Software and Driver as well as the update here: http://www.st.com/en/development-tools/st-link-v2.html
Install the Driver first, then the Software, then with the board connected with the MINI-USB / ST- Link, run the ST-LinkUpgrade app. (Through the STM32 ST-LINK Utility it only suggest to update to M15)
Merry Christmas :) (other holidays are available)
Hal
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I am finally building my old sammichFM kit :)
The LCD that came with it is an Orient Display FSTN Negative red
On the PCB there is an option for "High-power" backlight (250mA)
The standard configuration is for "Low-power" (25mA)
The paper for the LCD says: Max V= 4,1 and that the forward current for the RED backlight is 210mA
Which setting should I use?
I think it is a bit dark/dim, or maybe it's the type of LCD.
Is it safe for this LCD to use the High-power setting?
Cheers, Hal
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Thanks :)
I am hoping to use my music equipment more with this form factor. It's a pelican- style case that I have mounted rails in. 19" rack rails for the SEQ and Eurorack rails for the synths. They are all MIDI synths, no modular analog synths (yet anyway). 3+3+1U, 93HP
Good ideas about the flat cable :) The less I have to do to set it up, the better.
Is the Ground from MIDI OUT to the shield of the MIDI cable important?
I have to figure out about the powering of the synths, and the audio out. Trying to figure out a power supply with 5V, 9V, 12V and 15V. I guess I have to accept some cables.
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Thanks for the tip, and the offer.
I think I will still need my Quad IIc for the total of 8 direct MIDI OUT? Or can I get that with the STM32F4-to-BOB adapter board?
I don't have much space in this case I am making, so I am trying to do it with as little modules/components as possible (see image)
It just felt unnecessary to plug in and out 8 MIDI cables each time. A short serial cable will work great I think, also for when I detach the lid from the SEQ part and have them next to each other.
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Hey, that's a cool project.
So a 9-pin shielded serial cable, and "BOB's your uncle" ;)
Do you have any suggestions where to get one?
I was looking for one earlier today, but none of them where 1:1 in pins and had wires on all the pins, that's why I thought of the VGA, I have tons of them.
But your right, they are stiff and thick
Hal
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Thanks for the info.
I am also considering another option.
Is it possible to use a "multi midi cable"?
Does MIDI cables need individual shielding, or could I use a D-Sub connector cable like a VGA cable with a DE-15 connector from the SEQ to the case with the 8 synths.
So the 8 M- pins from the 2x MIDI IO modules and 1x Quad IIC module get an individual wire, the Ground goes to the shield of the VGA cable and the 5V gets a wire.
On the other side of the cable, in the synth-case I could connect a MIDI wire and a 220 ohm resistor from the 5V to the MIDI IN on each synth.
Would this work? Or will it be "cross talk" between the "MIDI wires" inside the cable.?
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Yes, that looks very nice.
The LEDs are singing "It's hip to be square" ;)
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That worked great, thanks :)
Used a MC74HC04A Hex-inverter I had.
I guess I can use the 3 remaining inverters on this chip for the second port and one more chip for tree and four.
What I'm not sure of is the difference in latency in this, compared to the direct MIDI OUT from the UARTs, but I'm pretty sure I can't hear it.
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Thanks guys, I have a try with a hex-inverter after the out pin on the GM5 chip, and then a MIDI Out DIN circuit with 220 ohms resistors.
Hal
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> Maybe the problem can be simplified on the other end: one or two DIN MIDI with a thru box on the other end.
That's a possibility. I could test that and see what kind of latency etc I get.
Cheers, Hal
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Yes the diagram is incomplete, I have 2 x MIDI IO and 2 x Quad IIC connected to the Core already :)
But I was thinking for the mobile solution, that I could get away with mounting the GM5 in the case with the synths, and then I only have to connect the SEQ and the synths with one USB cable.
Do you know how long the cable can be between the Core and the MIDI IO and Quad IIC modules, or if there is a "Line Driver" solution for long cables for this purpose?
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Hi,
I am making my sequencer and some synths mobile, by mounting them in a case. I would like as few cables as possible.
The SEQ V4 can run a GM5 module through an OTG adapter, so with only one USB cable out from the SEQ, I can get 4 MIDI OUT port over USB.
I have 8 synths that I want to connect, but none of them have a MIDI THRU port.
They can all receive MIDI on different channels, so 4 OUT should be plenty.
Q: Would it be possible to "split" the 4 MIDI OUT ports on the GM5 into 2 each? If yes, how?
Can I just connect 2 cables to the same OUT?
Can I use a Hexinverter as a MIDI THRU?
Or do I have to have a full MIDI THRU circuit with a MIDI IN through an Opto, then the Hexinverter?
All suggestions are welcome, maybe this is not the best way to do it at all.
Cheers, Hal
MIDI OUT 4 problem
in MIDIbox SEQ
Posted
Could someone please measure the MIDI OUT 1-4 on their STM43F4 Core or MIDI I/O module, and see if they get the same values I get?
Cheers, Hal