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Youtube

Watch the related Demo Video on Youtube for a workout in musical context.

S54 (Liv's Synth - A Demo)

Watch the corresponding Video Manual on Youtube for a detailed feature explanation.

S54 (Liv's Synth - A Demo)

Build Instructions

How to convert a CubeMX / CubeIDE project to GNU ARM Toolchain with CMake, openocd and VS Code

Prerequisites

Available on PATH

  • ARM toolchain
  • make
  • cmake
  • openocd

VS Code extensions

  • MS C/C++
  • MS C/C++ Extension Pack
  • Cortex Debug

Workflow

Copy to project directory:

  • README.md
  • Makefile
  • CMakeLists.txt
  • cmake folder with arm toolchain cmake directives
  • .gitignore file
  • swvtrace.sh
  • svd file (optional)
  • folder .vscode/launch.json and adapt settings
  • folder "App"

then

  • Adapt settings in CMakeLists.txt header
  • rename myAppMain [.hpp/.cpp]
  • include myAppMain.hpp in Core/Src/main.c
  • add projectMain() to main.c (right before while loop)
  • right click CMakeLists.txt -> configure all projects
  • start coding

Tested on

  • Mac
  • Linux

2022-03-08: There is an issue using ARM Toolchain 11.2.1: https://community.arm.com/support-forums/f/compilers-and-libraries-forum/52377/internal-compiler-errors-with-arm-none-eabi-gcc-11-2-2022-02-on-macs-with-apple-silicon Stick with 10.3 for now!! 2022-11-13: The issue is solved within Toolchain version 11.3.1

Upload to github

  • git init
  • git add .
  • git config user.name "<>"
  • git config user.email "<>"
  • git commit -m "First commit"
  • git branch -M main
  • git remote add origin https://github.com/SloBloLabs/<"ProjectRepo">.git
  • git push -u origin main

--

Update github access token

  • git remote remove origin
  • git remote add origin https://oauth2:<>@github.com/<>/<>.git
  • git remote -v

--

Bake a new release on Github: git tag // e.g. v0.2.1 git push origin

--

STM32 USB Composite device

Composite USB interface:

1 configuration 3 interfaces (2CDC + 1MIDI) 6 endpoints

CDC:

  • 2 interfaces
    • 0: communications control
      • 1 endpoint 0x82
    • 1: communications data
      • 2 endpoints 0x01 + 0x81 (BULK)
  • 4 endpoints overall
    • EP0
    • EP1
    • EP3 (in only: 0x83)

MIDI:

  • 1 interface
    • 0: Audio/Streaming
      • 2 endpoints 0x02 + 0x83 (BULK)
  • 3 endpoints overall
    • EP0
    • EP2

Build Instructions

Use the ibom tool inside the hardware section of the repository to track your work!

Power

  • Place USB Micro Connector J21
  • Place all components from power section
    • U8
    • D12
    • FB1
    • U1
    • J24, J24, J12, J7
    • C49, C52, C32, C33, C1, C2, C3, C7
    • R1, R2, R11
    • SW7
  • Check voltages at J201, do proceed if everything is ok!

Assembly of backside

  • assemble all components (except 5mm LEDs!) on the backside of the mainboard, preferably using the following order:
    • SMD components
    • resistors
    • diodes
    • DIP socket and DIP components
    • transistors (Q4/Q5, Q8/Q9 and Q11/Q12 must be matched)
    • tempco resistor
    • pin headers
    • capacitors

Assemply of frontside

  • assemble potentiometers, trimmers, spacers and switches of the mainboard, DO NOT SOLDER THEM YET!
  • put the faceplate on top and make sure all components incl. trimmers fit into the wholes
  • fasten the M2.5 screws in the corners
  • turn the set around and solder everthing
  • remove the faceplate again

Assmebly of speaker

  • First put screws from backside, hex nuts on the front side and tighten them
  • solder the hex nuts to the solder pads
  • apply two pieces of bell wire of about 5cm in lenght to the speakers solder pads
  • remove screws and mount the speaker to the frontside using the screws the other way around
  • if using the battery holder you may need to shorten one of the screws to make it fit
  • connect the loose ends of speaker wires to J4

LEDs

  • assemble the 5mm LEDs on the backside
  • bend their heads in a 180° U-turn into the holes behind the transparent potentiometers, so they can emit as much light as possible into their shafts

Flashing the firmware

  • make sure, dfu-util (https://dfu-util.sourceforge.net) is installed on your machine
  • switch off the synthesizer
  • pull the run/program toggle switch next to the micro USB port to lower (program) position
  • connect a USB cable between the synth and your computer
  • switch on the synth again
  • execute the following command:
dfu-util -a 0 -s 0x08000000 -D <path to LivSynth.bin>
  • The output in the console shoud look similar to this:
dfu-util -a 0 -s 0x08000000 -D build/LivSynth.bin
dfu-util 0.11

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2021 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

dfu-util: Warning: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release
Opening DFU capable USB device...
Device ID 0483:df11
Device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Interface #0 ...
Determining device status...
DFU state(10) = dfuERROR, status(10) = Device's firmware is corrupt. It cannot return to run-time (non-DFU) operations
Clearing status
Determining device status...
DFU state(2) = dfuIDLE, status(0) = No error condition is present
DFU mode device DFU version 011a
Device returned transfer size 2048
DfuSe interface name: "Internal Flash  "
Downloading element to address = 0x08000000, size = 49412
Erase           [=========================] 100%        49412 bytes
Erase    done.
Download        [=========================] 100%        49412 bytes
Download done.
File downloaded successfully

Hint: if you are building the firmware from the repo, the DFU command is called by simply writing

make dfu
  • switch off the synth and remove the USB cable
  • pull the run/program switch up (run) again
  • switch on the synth
  • Click shift + run to enter sequence control mode
  • press and hold button 8 for more than 2 seconds. This will initialize the sequencer program in flash. The synth is now reset.
  • Press run again to get back to pattern mode

Test & Calibration

  • connect a 9V center negative power supply to the barrel jack
  • switch on the device and wait a moment. Turn it off again if you see anything suspicious. ("smoke test")
  • At least the keyboard LEDs should light up in white colour and the LFO LEDs are blinking

VCO

  • SAW amplitude
  • SQUARE amplitude
  • fine tune & tracking
    • Press a button and tune it to the lowest note (red) using the tune knob
    • Press another button and tune it to the red note two octaves higher
    • Press a third button and tune it to the highest red note

VCA

  • balance...