[stm32f429i-discovery] Added usbmidi example.

This board connects the USB HS interface to the micro usb connector as
opposed to the USB FS interface on the stm32f4-discovery board. This is
why we are using different pins, different periph and different driver.
At the end it should(TM) behave the same as the HS interface implements
FS too.

examples/stm32/f4/stm32f429i-discovery/usb_midi/Makefile

@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usbmidi
+
+LDSCRIPT = ../stm32f429i-discovery.ld
+
+include ../../Makefile.include
+

examples/stm32/f4/stm32f429i-discovery/usb_midi/README

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+------------------------------------------------------------------------------
+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:
+------------------
+
+  CN6	(USB_OTG_HS)	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
+    $
+
+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
+    $
+