117 lines
3.0 KiB
Python
117 lines
3.0 KiB
Python
# SPDX-FileCopyrightText: 2021 Sandy Macdonald
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#
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# SPDX-License-Identifier: MIT
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# Demonstrates how to send MIDI notes by attaching handler functions to key
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# presses with decorators.
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# You'll need to connect Keybow 2040 to a computer running a DAW like Ableton,
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# or other software synth, or to a hardware synth that accepts USB MIDI.
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# NOTE! Requires the adafruit_midi CircuitPython library!
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import time
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import board
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import random
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from keybow2040 import Keybow2040
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import usb_midi
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import adafruit_midi
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from adafruit_midi.note_off import NoteOff
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from adafruit_midi.note_on import NoteOn
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# Set up Keybow
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i2c = board.I2C()
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keybow = Keybow2040(i2c)
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keys = keybow.keys
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# Set USB MIDI up on channel 0.
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midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=5)
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# The colour to set the keys when pressed.
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rgb = (255, 50, 0)
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# MIDI velocity.
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start_note = 60
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velocity = 127
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# Arpeggio style:
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# 0 = up
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# 1 = down
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# 2 = up down
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arp_style = 2
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if arp_style == 0 or arp_style == 2:
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direction = 1
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elif arp_style == 1:
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direction = -1
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last_played = None
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last_pressed = []
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speed = 5
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# Loop through keys and attach decorators.
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for key in keys:
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# If pressed, turn on LED.
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@keybow.on_press(key)
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def press_handler(key):
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key.set_led(*rgb)
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# If released, turn off LED.
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@keybow.on_release(key)
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def release_handler(key):
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key.set_led(0, 0, 0)
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while True:
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# Always remember to call keybow.update()!
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keybow.update()
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if keybow.any_pressed():
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pressed = keybow.get_pressed()
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if pressed != last_pressed:
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notes = [start_note + k for k in pressed]
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last_pressed = pressed
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if arp_style == 0 or arp_style == 2:
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this_note = 0
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elif arp_style == 1:
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this_note = len(notes) - 1
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midi.send(NoteOn(notes[this_note], velocity))
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print(notes[this_note])
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last_played = time.monotonic()
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elapsed = 0
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last_note = this_note
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this_note += direction
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else:
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if notes != []:
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elapsed = time.monotonic() - last_played
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if elapsed > 1 / speed:
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if this_note == len(notes) and direction == 1:
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this_note = 0
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elif this_note < 0:
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this_note = len(notes) - 1
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midi.send(NoteOff(notes[last_note], 0))
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midi.send(NoteOn(notes[this_note], velocity))
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print(notes[this_note])
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last_played = time.monotonic()
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last_note = this_note
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if arp_style == 2 and this_note == len(notes) -1:
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direction = -1
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elif arp_style == 2 and this_note == 0:
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direction = 1
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this_note += direction
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elif len(last_pressed) and keybow.none_pressed():
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for note in range(128):
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midi.send(NoteOff(note, 0))
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last_pressed = [] |