Arduino MIDIUSB

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Arduino MIDIUSB

Can be used as the "transport layer" for the more advanced Arduino MIDI library

supports AVR, SAM, SAMD

Building example sketch MIDIUSB_loop.ino for Generic STM32F1 fails

- fixed USB MCU error by enabling, in Tools
USB support "CDC (generic 'Serial' supersede U(S)ART)" fixed USB MCU error

Unlike ESP32, STM32duino does NOT use TinyUSB

STM32F1 had Arduino MIDI support,
using USB Composite library for Roger's Melbourne's STM32F1 core

@Levi--G's USBLibrarySTM32

reportedly works with Arduino sketches in platformio,

emulates PluggableUSB, but has issues in Arduino 2.
- wanted to pretend that it is ARDUINO_ARCH_AVR;
instead, hacked MIDIUSB.h:

	- #if defined(ARDUINO_ARCH_AVR)
	+ #if defined(ARDUINO_ARCH_AVR) || defined(HAL_PCD_MODULE_ENABLED)

- requires USBCON and HAL_PCD_MODULE_ENABLED build flags
probably set in menu based on usb_flags and platform.txt
- Arduino 2 does not see files in USBLibrarySTM32/include/;
moving files to USBLibrarySTM32/src/ fixes that.
- reported my experience
- coordination with STM32duino core USB is discussed here;
likely integration would be as a menu option

This compiles with hacked MIDIUSB Library for Arduino example sketch,
but then fails to link because it duplicates STM32duino USB library definitions.

STM32duino USB multiple definition possible workaround

install and use a custom core version
more details: Platform specification
- hopefully applies to Arduino 2...?
- is STM32duino "core" literally https://github.com/stm32duino/Arduino_Core_STM32?
that seemingly matches (658MB) content at
AppData/Local/Arduino15/packages/STMicroelectronics/hardware/stm32/2.11.0/

results from grep -R USBD_Init

potential hack, based on feedback from @Levi--G

add platform.local.txt file in packages/STMicroelectronics/hardware/stm32/2.11.0/:
USBDevice_include_dir=/libraries/USBLibrarySTM32
With only this change, builds fail:

C:\Users\bleke\AppData\Local\Arduino15\packages\STMicroelectronics\hardware\stm32\2.11.0\cores\arduino/WSerial.h:7:12:
	 fatal error: USBSerial.h: No such file or directory
    7 |   #include "USBSerial.h"
      |            ^~~~~~~~~~~~~
compilation terminated.

Success requires setting USB support (if available): "None", then:

$ cat MIDIUSB_loop/build_opt.h
-DUSBCON -DHAL_PCD_MODULE_ENABLED

Attempts to build a USBSerial library in user space failed

Compiling STM32 core seemingly uses incompatible rules...

USB enumeration, endpoints and descriptors

maintained by blekenbleu