rogerallen/stm32disc_midisynth1 开源项目中文解读：技术栈、适用场景与上手建议

项目介绍

rogerallen/stm32disc_midisynth1 是一个托管在 GitHub 上的开源项目，主要使用 C 编写，目前获得 15 个 Star、1 次 Fork。

仓库全名: rogerallen/stm32disc_midisynth1

README 摘要

STM32F407VG Discovery Midi Synth Extension of the https://github.com/rogerallen/stm32discsynth1 project adding USB MIDI keyboard input and synth configuration over serial bus (USART2 on PA2 & PA3) connected to computer. I did this for learning purposes. Feedback is welcome. Goals Next step in making a synth. use STM32CubeIDE USB MIDI Keyboard Control using HAL & BSPAUDIO Stm32 Firmware a basic, "reasonable"-sounding…

完整内容见 GitHub 原始 README 或本页。

常见问题

stm32disc_midisynth1 用什么语言开发？

主要使用 C 编写，目前有 15 个 Star。

如何获取 stm32disc_midisynth1 的源码？

可以直接克隆仓库：git clone https://github.com/rogerallen/stm32disc_midisynth1.git，默认分支为 main；安装与运行步骤见仓库 README。

stm32disc_midisynth1 最近还在维护吗？

仓库最近一次更新为 2021年7月28日，当前没有未关闭的 Issue；Star 数为 15，可作为社区活跃度的参考。

关于

midi-controlled synth example for STM32F407VG Discovery board

midi midi-synthesizer stm32 stm32cubeide stm32f4-discovery wavetable-synthesizer

15 Stars
1 Forks
2 Watching

描述取自 GitHub 官方 API，中文内容由 GitRead 中文社区编辑团队整理。

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贡献者

rogerallen

STM32F407VG Discovery Midi Synth

Extension of the https://github.com/rogerallen/stm32disc_synth1 project adding USB MIDI keyboard input and synth configuration over serial bus (USART2 on PA2 & PA3) connected to computer.

I did this for learning purposes. Feedback is welcome.

Goals

Next step in making a synth.
use STM32CubeIDE
USB MIDI Keyboard Control
using HAL & BSP_AUDIO Stm32 Firmware
a basic, “reasonable”-sounding synth
polyphonic, wavetable-based synth
resonant lowpass filter
reverb
user button to reset & reprogram synth

To Do

Add USB Hub so I can have both keyboard midi device and control midi device connected. Having USB-connected PC control would be great, too.
fix the FIXMEs

Usage

git clone this repo
add repo to STM32CubeIDE
compile & run
plug in midi keyboard (via USB OTG adapter cable) to send note on, note off messages
listen to sounds
connect computer to serial bus to USART2 on PA2 & PA3
press user button to reset & reprogram synth

Note

If you run in Debug mode, the full 10-voice synth will fail because it cannot keep up.
Change the number of voices to 2 in synth.c.

Coded for clarity, not necessarily performance.

Reprogram Synth

press user button, the orange LED will activate & this will cause it to output

begin edit mode
{
  wave      = 0
  voices    = 10
  attack    = 200
  decay     = 200
  sustain   = 800
  release   = 200
  scale     = 300
  cutoff    = 600
  resonance = 5
  wet       = 750
  delay     = 1500
}
Enter 'variable value' (e.g. 'attack 500').
End edit mode with '.'

wave, voices, cutoff and resonance are unscaled but the rest of the values are scaled by 1000. (scanf %f was giving me grief so 1.0 is now 1000)

!!! Be careful. Read the code for setting ranges. No error checking. !!!

Enter in settings and finish with a .

wave 1
attack 800
cutoff 1000
.

License

Who the heck knows? I pulled stuff from everywhere to make this. It is likely GPLv2 due to usbh_MIDI.

usbh_MIDI by Xavier Halgand (GPLv2) via https://github.com/MrBlueXav/Dekrispator_v2 biquad by Sean Connelly (MIT) via https://github.com/velipso/sndfilter reverb written by me but inspired by https://github.com/YetAnotherElectronicsChannel/STM32_DSP_Reverb

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