5b30e3d98d
USB_VBUS is not an alternate function, it is an additionnal function which is always enabled. If configured as an alternate function, it will draw current from VBUS.
README
This example implements a USB MIDI device to demonstrate the use of the USB device stack. It implements the device configuration found in Appendix B of the Universal Serial Bus Device Class Definition for MIDI Devices.
The 'USER' button sends note on/note off messages.
The board will also react to identity request (or any other data sent to the board) by transmitting an identity message in reply.
Board connections
| Port | Function | Description |
|---|---|---|
CN5 |
(USB_OTG_FS) |
USB acting as device, connect to computer |
Testing
To list midi devices, which should include this demo device
$ amidi -l
Dir Device Name
IO hw:2,0,0 MIDI demo MIDI 1
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To record events, while pushing the user button
$ amidi -d -p hw:2,0,0
90 3C 40 -- key down
80 3C 40 -- key up
90 3C 40
80 3C 40^C
12 bytes read
$
To query the system identity, note this dump matches sysex_identity[] in the source.
$ amidi -d -p hw:2,0,0 -s Sysexdump.syx
F0 7E 00 7D 66 66 51 19 00 00 01 00 F7
^C
13 bytes read
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