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Forum Index : Microcontroller and PC projects : CMM2 music composition ideas seqeuncers,trackers,etc.
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| Daren Newbie  Joined: 05/08/2020 Location: United KingdomPosts: 25 |
Hello everybody! 1st post and happy to be here!   After seeing the CMM on 8bitguy last year and the CMM2 more recently on CTRIX and 8bitguy, I decided to track one down and take the plunge. I am very much not a programmer, although I find it interesting and intend to have a dabble with some simple stuff at first. My primary interest in CMM2 is the music and sound capabilities, and the GPIO port for interfacing with external devices, I have quite a nice set up of synthesizers and other sound and music making equipment. I also use Gameboys and a C64 for music making, and I have modified these to better suit music applications. So the things that interest me specifically on the CMM2 are the wav and synthesis capabilities, including the old school TTS speech (gotta love them robot voices!) I am also very interested in the demo scene, although I was never a part of it personally. I am hoping to try some midi stuff, including making a midi interface, although I have no idea if it is possible to set the baud rate to the required 31250bps yet? Also thinking that I can use the GPIO for things like trigger inputs and outputs for various things, a lot of my gear can send and receive voltage pulses, so it should not be too difficult to build some appropriate buffer circuitry to allow this. I'm not in any particular rush to dive deeply yet, so in the meantime has anyone else done anything or intend to do anything related to music making on CMM2? If so I'd be interest to see/hear what. Things that I am thinking about: Trackers and Sequencers Midi utilities like say midi monitor, editors etc. Conversion utilities like BPM/Hz/Ms/Bar/Sample rate calculators. Synthesis using the built in commands Music playlist creators for wav/mp3/mod files Alternative music control systems using GPIO sensors etc. Etc. Any and all comments welcome! Thanks Daren |
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| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3472 |
Great ideas. See CMM2 FM synthesizer I don't know what progress is being made, or attempted. (oops, I see you have seen that thread) Edited 2020-08-05 22:08 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 734 |
Good question ! The manual says " any baud rate " but sometimes that means any ' standard ' baud rate. my site |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
Yes I hope it is possible, if so it could do a lot of handy midi stuff I think. |
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| Atomizer_Zero Senior Member  Joined: 04/07/2020 Location: United KingdomPosts: 134 |
The manual says "OPTION BAUDRATE nbr : Set the baud rate for the serial console to 'nbr'. This can be any value between 1200 (the minimum) and 1000000 (1MHz). " This is for the serial communication ports COM1 and COM2 (and COM3 if OPTION CONSOLE SCREEN is used), right? |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
Ok so I don’t have a printed manual yet, I connected a midi interface to the GPIO pins, what I’d like to do next is some rudimentary midi transmit and receive tests, but as yet I don’t have a clue how to code it. Easiest to start with sending data I think, so: What I want to do Set com1 to baudrate 31250 Note sub routine Send a midi note on number 60 channel 1 to com1 tx Wait 500ms Send a midi note off number 60 channel 1 to com1 tx Wait 500ms loop back to note subroutine until any key is pressed Can anyone help with the code please? Here is a breakdown of the midi protocol for reference https://ccrma.stanford.edu/~craig/articles/linuxmidi/misc/essenmidi.html |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4139 |
Won't the PDF manuals do? All easily downloaded - unless you're on 1200baud dial-up or some such? John |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
I have the PDFs but can’t really see them too well on a phone screen also at this point my knowledge of how to translate what I want to basic even with the manual isn’t quite up to the job :  |
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| Atomizer_Zero Senior Member Joined: 04/07/2020 Location: United KingdomPosts: 134 |
Hmm im interested in this myself. I have some midi equipment for playing the music in DOS games from my retro pcs. I have a Roland Sound Canvas SC-55 and a bunch of midi compatible sound cards and whatever else. I'm interested in how you connected the Midi Connector to the GPIO's? A schematic would be handy. Edited 2020-08-06 05:14 by Atomizer_Zero |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
I just used a Hobbytronics midi breakout: https://www.hobbytronics.co.uk/midi-breakout Then bridged the 3.3v solder pads (important as the pins used are 3.3v, not 5v) Then connect using dupont style female cables: https://www.amazon.co.uk/Elegoo-120pcs-Multicolored-Breadboard-arduino-colorful/dp/B01EV70C78/ref=asc_df_B01EV70C78/?tag=googshopuk-21&linkCode=df0&hvadid=310773493424&hvpos=&hvnetw=g&hvrand=307777361232053736&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9044871&hvtargid=pla-362913641420&psc=1 5v from breakout to gpio pin 2 Ground from breakout to gpio pin 6 Out from breakout to gpio pin 8 In from breakout to gpio pin 10 You will need to solder a 4 way female pin header to the breakout board as it does not come with one fitted, luckily I had one in my parts box, this one: https://www.hobbytronics.co.uk/header-female-1-4?utm_source=google&utm_medium=googleshopping&utm_campaign=googlebase&gclid=EAIaIQobChMIh4Gi0OSE6wIVhM13Ch1DYwywEAQYASABEgLFj_D_BwE Hope that helps! Edited 2020-08-06 05:24 by Daren |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 734 |
Not sure but try : 10 OPEN "com1:31250" AS #1 20 PRINT #1, CHR$(144); CHR$(60); CHR$(127); 30 PAUSE 500 40 PRINT #1, CHR$(144); CHR$(60); CHR$(0); 50 PAUSE 500 60 GOTO 20 Maybe need to CLOSE each time ? my site |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
hitsware2 that worked just fine, so many thanks for posting it. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4139 |
Wow - I bet that is true!! A cheap PC (desktop or laptop) would help you :) Even a REALLY old one will run Linux quickly and be all you need. (Otherwise put up with clunky Windows, but again an ancient cheapy will do.) John |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
Yes I have a computer but it is in the office, the CMM2 is in the cave, so squinting at a phone is all I have for now until I get the manuals printed :) Anyway, glad to report MIDI is a go on CMM2, well MIDI out at least. |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 734 |
What are you using for a synth ? my site |
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| Daren Newbie Joined: 05/08/2020 Location: United KingdomPosts: 25 |
So far I just tried a midi monitor and a small Roland sound module (PMA5) it seems to work fine. Next I will try using keyboard keys to play notes, then probably try using a potentiometer to send midi CC data - that will be a little trickier though as I don’t know how to stop it reading and sending a value everytime through the loop, rather than only reading and sending when the pot value has changed. |
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