1  # SPDX-FileCopyrightText: 2018 John Park for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  # Simple example of sending MIDI via UART to classic DIN-5 (not USB) synth
 6  
 7  import adafruit_trellism4
 8  from rainbowio import colorwheel
 9  import board
10  import busio
11  midiuart = busio.UART(board.SDA, board.SCL, baudrate=31250)
12  print("MIDI UART EXAMPLE")
13  
14  trellis = adafruit_trellism4.TrellisM4Express()
15  
16  
17  for x in range(trellis.pixels.width):
18      for y in range(trellis.pixels.height):
19          pixel_index = (((y * 8) + x) * 256 // 2)
20          trellis.pixels[x, y] = colorwheel(pixel_index & 255)
21  
22  current_press = set()
23  
24  while True:
25      pressed = set(trellis.pressed_keys)
26  
27      for press in pressed - current_press:
28          x, y = press
29          print("Pressed:", press)
30          noteval = 36 + x + (y * 8)
31          midiuart.write(bytes([0x90, noteval, 100]))
32  
33      for release in current_press - pressed:
34          x, y = release
35          print("Released:", release)
36          noteval = 36 + x + (y * 8)
37          midiuart.write(bytes([0x90, noteval, 0]))  # note off
38  
39      current_press = pressed