demo new USB MIDI Host capability in CircuiPython

usb_host_midi_demo.py

# usb_host_midi_demo.py - demo new USB MIDI Host capability in CircuiPython
# 27 Nov 2023 - @todbot / Tod Kurt
# adapted from https://github.com/adafruit/Adafruit_CircuitPython_USB_Host_MIDI/blob/main/examples/usb_host_midi_simpletest.py
# needs "circup install adafruit_midi adafruit_usb_host_descriptors"
# and hand-copy library from https://github.com/adafruit/Adafruit_CircuitPython_USB_Host_MIDI
import time
import board
import usb.core
import adafruit_usb_host_midi
import adafruit_midi
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn
from adafruit_midi.control_change import ControlChange
from adafruit_midi.pitch_bend import PitchBend
from adafruit_midi.timing_clock import TimingClock

import usb_host
usb_host.Port(board.GP20, board.GP21)

print("Looking for midi device")
raw_midi = None
while raw_midi is None:
    for device in usb.core.find(find_all=True):
        try:
            raw_midi = adafruit_usb_host_midi.MIDI(device)
            print("Found vid/pid %04x/%04x" % (device.idVendor, device.idProduct),
                  device.manufacturer, device.product)
        except ValueError:
            continue

midi = adafruit_midi.MIDI(midi_in=raw_midi, in_channel=0)

while True:
    msg = midi.receive()
    if msg is not None:
        print(time.monotonic(), msg)