Midi Clock/BPM Master #164
Replies: 12 comments 30 replies
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also this looks really interesting functionalitywise, maybe it is possible to implement this code too |
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looks interesting, but also not finished as what i read? |
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This is possible, yeah. Do you have any recommendations for software I could use to verify clock drift / accuracy? |
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woohoo! not really, but i found this , where it gets talked about https://midisizer.com/midigal/midiclk/ which also opens an interesting point: there is always the problem of syncing midi clock coming from a DAW because of clock inaccuracy, and they seem to have found a way to code it so that this jitter gets erased |
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Well, I mean, if I implement this, how will you determine whether there's unacceptable jitter? By ear or you have other way of determination / measurement? |
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The tool MIDI-OX shows the received midi-clock on the fraction. |
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If anyone wants to test this, let me know which board are you using. |
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Unfortunately, I only have V.1 mainboards so far, but I plan to build V.2 hardware boards with which I would definitely want to use it. |
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Consider supporting the project with buying the official board: https://www.tindie.com/products/paradajz/opendeck-diy-midi-platform-v3/ Slightly off-topic, but a very-slight variation of v2 boards will also be available on Tindie in a month or two. |
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It would be important to me that the form factor of the board remains the same. |
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Hey, I got the 2.0.1 Board, happy to test it out! |
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i can help testing on blackpill401cc |
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opendeck2.zip Here's the initial MIDI clock implementation (attached firmware update file for OpenDeck v2 board). The clock is sent out on DIN MIDI only for now. To start it, enable DIN MIDI, enable sending of MIDI clock, assign one of the buttons to Real Time Clock message type and then press the button. Edit: @basst22778 I've added the sysex binary for blackpill401cc |
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In my opinion this is completely independent. The generator just always sends clock signals. And the start/stop/continue messages can come at any time in between. |
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Can you please describe your use case in more detail? I don't think we're on the same page here. |
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I think all you have to do is copy what is in the else branch to the if branch as well so that the messages are sent. continue works by the way. |
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I was interested in what your use case is. Why does the instrument/device/whatever you're sending the clock to care about those messages? |
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These 3 messages synchronize sequencers. In the MIDI standard it is really the case that the clock generator does not have to stop when stop is sent. The MIDI Clock Generator should always be running. With the 3 commands you then control the device/sequencer. I am using an old software that I would like to control: "ReBirth 338". Apparently the implementation here is that it waits for a START message before synchronizing. Currently START and STOP are not sent on MIDI-DIN. Continue is sent. |
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Thanks for the explanation. I'm ignorant on these things since it's something I don't use. Here's the updated firmware with the start/stop messages now being sent. |
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I think an external clock generator is also interesting for performers. A function that has already been suggested would be interesting later on to "tap" the tempo with a button. Thank you for your efforts! |
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There is another problem with this new version: The MIDI clock generator stops generating MIDI clock messages with STOP. As said, the generator should ALWAYS be running and sending out a steady stream of MIDI clock signals. For me it is now the case that the continue function is of course crazy. |
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Right. The clock is now sent out constantly, and the start/stop messages won't cause the clock to start/stop. If the "send MIDI clock" option is enabled, the clock is always sent. Only when you disable it will the clock stop. |
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I can confirm: It now works as it should. Great. Thank you very much. |
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Maybe a Option to displaying the BPM and the last sended command (START/STOP/CONTINIUE) on I²C display? |
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Hi Igor, I was finally able to buy an original M board from you, thanks for the super fast delivery. Now I have everything together to continue working on my project. Can you compile a firmware for me with the BPM option for the M board? Thanks and Greetings. |
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Here it is. Short circuit the 2-pin header named RPB before turning on the board and verify that a new disk drive RP2 appeared. Once it did, remove the short circuit and drag the uf2 file onto it from the archive. Keep in mind that this branch is now over a year old and hasn't been tested in a very long time. |
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The feature is now available on the master branch. It's not supported on AVR MCUs (ATmega2560 and AT90USB1286) but it will work everywhere else. I encourage anyone interested in this to test it out. |
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Feature released in v7.6.0 |
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Hi, It would be great to be able to have Midi Clock Master Functions in OpenDeck.
In General i want to build a device that can give out a stable,jitterfree Midi Clock signal or BPM to other gear like Synthesizers,drummachines, etc.
This is especially usefull if you want to synchronize multiple midi instruments to the same clock or bpm.
With the hype around synths today, a lot of people jam together or have multiple synths on their own, and one big problem is always to sync everything right on time.
It would be great if it is possible to build a device that can have:
-An encoder to set a BPM number
-Tap Tempo Button, tapping that button to a beat calculates the bpm, (lets say it takes the median time distance of the last 4 button hits, sees it as 4/4 beat, gives out the corresponding bpm)
-a start/stop button (sends midi start/stop signal)
-a reset button (restarts the cycle on all devices with the start of the next bar, usefull because in a longer jam sometimes instruments tend to drif off and out of sync after a while)
-a screen to show the bpm number (can be a simple 7-digit display)
-send clock signal to midi output , aswell as to a CV output (to sync modular synths etc)
there are similar things existing (but really rare and expensive, actually there are only 2 ):
https://www.e-rm.de/midiclock/ (this one misses a tap-tempo functionality)
https://www.kickstarter.com/projects/midronome/midronome-effortless-midi-synchronization (this one is cancelled!)
so you see, there is really market hole for something like this.
there are some arduino codes on github for midi clock, but sadly i lack the skills on getting that together, thats why i use OpenDeck;)
https://github.com/midilab/uClock
https://github.com/ElliotGarbus/MidiClockGenerator
https://forum.arduino.cc/t/tap-tempo-button-code/642650/5
https://create.arduino.cc/projecthub/victorman/arduino-metronome-tap-to-set-tempo-display-back-bpms-c13d46
https://github.com/dxinteractive/ArduinoTapTempo
Thx for all your work !
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