mirror of https://github.com/probonopd/MiniDexed
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107 lines
4.8 KiB
107 lines
4.8 KiB
# MiniDexed 
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[Dexed](https://asb2m10.github.io/dexed/) is a FM synthesizer closely modeled on the famous DX7 by a well-known Japanese manufacturer. MiniDexed is a port to run it on a bare metal Raspberry Pi (without a Linux kernel or operating system). __This is a work in progress. Contributions are highly welcome.__
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## TODO
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Contributions are highly welcome.
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- [x] Get [Synth_Dexed](https://codeberg.org/dcoredump/Synth_Dexed) to build with [circle-stdlib](https://github.com/smuehlst/circle-stdlib)
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- [x] Upload SD card contents to [GitHub Releases](../../releases)
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- [x] Get it to build for and boot on a Raspberry Pi 4
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- [x] Get it to react to USB MIDI
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- [x] Get it to react to MIDI via Raspberry Pi 4 GPIO
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- [x] Get it to produce some sound on the headphone jack
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- [x] Get it to produce some sound produced by Dexed
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- [x] Load a default (hardcoded) sysex
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- [x] Get it to build for and boot on a Raspberry Pi 3
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- [x] Get it to build for and boot on a Raspberry Pi 2
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- [x] Get it to build for and boot on a Raspberry Pi 1 and Raspberry Pi Zero
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- [x] Support multiple voices through Program Change MIDI messages
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- [ ] Add functionality for loading `.syx` files (e.g., from [Dexed_cart_1.0.zip](http://hsjp.eu/downloads/Dexed/Dexed_cart_1.0.zip))
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- [ ] Get 8 Dexed instances to run simultaneously (like in a TX816) and mix their output together
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- [ ] Add a way to configure each Dexed instance
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- [ ] Allow for each Dexed instance to be stereo shifted
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- [ ] Add reverb effect
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I am wondering whether we can run multiple Dexed instances, in order to recreate basically an open source equivalent of the TX802 (8 DX7 instances without the keyboard in one box).
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## Usage
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* Download from [GitHub Releases](../../releases)
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* Unzip
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* Put the files into the root directory of a FAT32 formatted partition on SD/microSD card
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* Put SD/microSD card into Raspberry Pi 1, 2, 3 or 4 (Zero and Zero 2 can probably be used but need HDMI or a supported i2c DAC for audio out)
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* Attach headphones to the headphone jack using `sounddev=sndpwm` in `cmdline.txt` (default)
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* Alternatively, attach a PCM5102A or PCM5122 based DAC and select i2c sound output using `sounddev=sndi2s | sndhdmi` in `cmdline.txt`
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* Alternatively, attach a HDMI display with sound and select HDMI sound output using `sounddev=sndhdmi` in `cmdline.txt` (this may introduce slight latency)
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* Attach a MIDI keyboard via USB
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* Boot
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* Stat playing
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## Building locally
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E.g., to build for Raspberry Pi 4 on a Ubuntu 20.04 build system, you can use the following example. See [`build.yml`](../../tree/main/.github/workflows/build.yml) for complete build steps that create versions for Raspberry Pi 1, 2, 3,and 4 in 32-bit and 64-bit as required.
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```
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RPI=4
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git clone https://github.com/probonopd/MiniDexed
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cd MiniDexed
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# Recursively pull git submodules
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git submodule update --init --recursive
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# Install toolchain
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wget -q https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz
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tar xf gcc-arm-*-*.tar.xz
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export PATH=$(readlink -f ./gcc-*/bin/):$PATH
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# Build circle-stdlib library
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cd circle-stdlib/
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./configure -r ${RPI} --prefix "aarch64-none-elf-"
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make -j$(nproc)
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cd ..
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# Build MiniDexed
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cd src
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make -j$(nproc)
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ls *.img
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cd ..
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# Get Raspberry Pi boot files
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cd ./circle-stdlib/libs/circle/boot
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make
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make armstub64
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cd -
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# Make zip that contains Raspberry Pi 4 boot files. The contents can be copied to a FAT32 formatted partition on a microSD card
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mkdir -p sdcard
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cp -r ./circle-stdlib/libs/circle/boot/* sdcard
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mv sdcard/config64.txt sdcard/config.txt
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rm -rf sdcard/config32.txt sdcard/README sdcard/Makefile sdcard/armstub sdcard/COPYING.linux
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cp ./src/*img sdcard/
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zip -r MiniDexed_Raspberry_Pi_${RPI}.zip sdcard/*
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# Optionally, create a RPi image. This can be written to a microSD card using tools like Etcher or dd
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sudo apt install --yes mount parted
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IMG="`date +%Y-%m-%d`_minidexed-RPi${RPI}.img"
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dd of="${IMG}" seek=50MiB bs=1 count=0
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sudo parted "${IMG}" mktable msdos
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sudo parted "${IMG}" mkpart primary fat32 2048s 100%
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DEV=`sudo losetup --find --partscan --show "${IMG}"`
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sudo mkfs.vfat -F 32 -n BOOT "${DEV}p1"
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mkdir boot
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sudo mount "${DEV}p1" boot
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sudo cp sdcard/* boot
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sudo umount boot
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sudo losetup -d "${DEV}"
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rm -r boot
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```
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## Acknowledgements
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* [asb2m10](https://github.com/asb2m10/dexed) for the [Dexed](https://github.com/asb2m10/dexed) sound engine
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* [dcoredump](https://github.com/dcoredump) for https://codeberg.org/dcoredump/Synth_Dexed, a port of Dexed for embedded systems
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* [rsta2](https://github.com/rsta2) for https://github.com/rsta2/circle, the library to run code on bare betal Raspberry Pi (without a Linux kernel or operating system) and for the initial MiniDexed code
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* [smuehlst](https://github.com/smuehlst) for https://github.com/smuehlst/circle-stdlib, a version with Standard C and C++ library support
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