Simple test

Ensure your device works with this simple test.

examples/midi_simpletest.py

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
# simple_test
import random
import time

import usb_midi

import adafruit_midi
from adafruit_midi.control_change import ControlChange
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn
from adafruit_midi.pitch_bend import PitchBend

print(usb_midi.ports)
midi = adafruit_midi.MIDI(
    midi_in=usb_midi.ports[0], in_channel=0, midi_out=usb_midi.ports[1], out_channel=0
)
print("Midi test")
# Convert channel numbers at the presentation layer to the ones musicians use
print("Default output channel:", midi.out_channel + 1)
print("Listening on input channel:", midi.in_channel + 1)
while True:
    midi.send(NoteOn(44, 120))  # G sharp 2nd octave
    time.sleep(0.25)
    a_pitch_bend = PitchBend(random.randint(0, 16383))
    midi.send(a_pitch_bend)
    # note how a list of messages can be used
    midi.send([NoteOff("G#2", 120), ControlChange(3, 44)])
    time.sleep(0.5)
    msg = midi.receive()
    if msg is not None:
        print("Received:", msg, "at", time.monotonic())