This project only use a CODEC, a QuadSPI NOR-flash and a STM32F7 microcontroller to provide a complete MIDI + audio USB soundcard. Continuation of https://github.com/julbouln/stm32f7discovery_midi_synth prototype. It now uses a memory and computing optimized version of https://github.com/schellingb/TinySoundFont and includes STM32 cubemx source code. A dedicated custom board is also provided even though STM32F746 discovery board is supported by the firmware. Features: - Composite USB audio, USB MIDI and USB mass storage - Integrated SF2 MIDI syntheziser - Easy SF2 soundfont customization with USB mass storage - Mixed MIDI synthesis and raw audio Custom board with minimal requirements: - STM32F746VET6 LQFP100 320kb ram + 512kb flash - S25FL256S 32mb nor flash - WM8731 codec Update SF2 font (Linux): When connected, Linux should show the Flash as mass storage: sd 6:0:0:0: [sdb] 8192 4096-byte logical blocks: (33.6 MB/32.0 MiB) sd 6:0:0:0: [sdb] Write Protect is off sd 6:0:0:0: [sdb] Mode Sense: 22 00 00 00 sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA sd 6:0:0:0: [sdb] Attached SCSI removable disk You just need to dd the sf2 file to the disk (can take several minutes): # dd if=yourfont.sf2 of=/dev/sdb bs=4096 Update SF2 font (balena Etcher) You can also update the SF2 using balena Etcher https://www.balena.io/etcher/. This program is intended for OS image, but you can use it for SF2: - you will need to rename your extension from .sf2 to .bin so Etcher can accept the file - Etcher will warn you that the image is not an OS, just hit continue and select SF2 ROM drive LED should blink if the font is properly recognized. Notes: Firmware tested with arm-none-eabi-gcc 9.2.1 20191025 SF2 fonts tested: - TimGM6mb http://www.timbrechbill.com/saxguru/Timidity.php - GeneralUser GS http://www.schristiancollins.com/generaluser.php (custom board only, 32mb font) Default make for STM32F746-DISCO board, use "make BOARD=MUSICBOARD" for custom board firmware. TODO: - bug: synthesis sometimes make a "click" noise - feature: TinySoundFont does not fully implement SF2 (modulators) - feature: Add MIDI IN/OUT uart interfaces - feature: USB-MIDI to MIDI interface (add MIDI-IN and MIDI-OUT) - feature: Audio IN - feature: Add sysex for chorus & reverb control Sources: - https://github.com/STMicroelectronics/STM32CubeF7 SF2: - https://github.com/schellingb/TinySoundFont USB audio with asynchronous feedback - https://github.com/dragonman225/stm32f469-usbaudio - https://github.com/ada-sound/X-CUBE-USB-AUDIO - https://github.com/Lefucjusz/Lefucjusz-USB-DAC USB composite: - https://github.com/sanuch14/STM32_CompositeHID_CDC