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