first commit neotrellis 8x8 MIDI feedback controller code

Author: jedgarpark

NeoTrellis_MIDI_Feedback_Controller/code.py

@@ -0,0 +1,154 @@
+# SPDX-FileCopyrightText: 2022 John Park & @todbot Tod Kurt for Adafruit Industries
+# SPDX-License-Identifier: MIT
+# NeoTrellis 8x8 MIDI Trigger Sequencer
+# Does bi-directional MIDI with VCV Rack + Stoermelder MIDI-CAT module
+# (can also work with with other apps, such as DAWs that send MIDI for LED controll)
+# This is a simplified version of https://github.com/PatchworkBoy/TrowasoftControl
+
+# Requirements:
+#  -VCV Rack 2, w/ MIDI-CAT
+#  -sequencer such as Trowa TrigSeq or Count Modula
+#  -MIDI mappings on pads on "momentary"
+
+import time
+import board
+import busio
+from adafruit_neotrellis.neotrellis import NeoTrellis
+from adafruit_neotrellis.multitrellis import MultiTrellis
+import usb_midi
+import adafruit_midi
+from adafruit_midi.note_on import NoteOn
+from adafruit_midi.note_off import NoteOff
+
+note_base = 36
+note_vel = 127
+pad_midi_channel = 0  # add one for "real world" MIDI channel number, e.g. 0=1
+led_midi_channel = 2  # see ^
+pad_ager_secs = 0.1  # how many seconds to wait for MIDI-CAT to fail
+pad_ager_secs_max = 1.0  # seconds max to wait for MIDI-CAT before giving up
+
+# holds whether pad is currently lit or not, when it was pressed before being ack'd
+# tuple of (pad lit?, pad_press_time_or_zero_if_ackd)
+pad_states = [(False,0)] * 64
+
+midi_usb = adafruit_midi.MIDI( midi_in=usb_midi.ports[0],
+                               midi_out=usb_midi.ports[1] )
+
+i2c = busio.I2C(board.SCL, board.SDA)
+trelli = [  # adjust these to match your jumper settings if needed
+     [NeoTrellis(i2c, False, addr=0x2E), NeoTrellis(i2c, False, addr=0x30)],
+     [NeoTrellis(i2c, False, addr=0x32), NeoTrellis(i2c, False, addr=0x36)]
+]
+trellis = MultiTrellis(trelli)
+
+OFF = 0x000000
+RED = 0x100000
+YELLOW = 0x100c00
+GREEN = 0x000c00
+CYAN = 0x000303
+BLUE = 0x000010
+PURPLE = 0x130010
+
+colors = [OFF, RED, YELLOW, GREEN, CYAN, BLUE, PURPLE]
+
+color_table = [  # you can make custom color sections for clarity
+  1, 1, 1, 1, 5, 5, 5, 5,
+  1, 1, 1, 1, 5, 5, 5, 5,
+  1, 1, 1, 1, 5, 5, 5, 5,
+  1, 1, 1, 1, 5, 5, 5, 5,
+  4, 4, 4, 4, 6, 6, 6, 6,
+  4, 4, 4, 4, 6, 6, 6, 6,
+  4, 4, 4, 4, 6, 6, 6, 6,
+  4, 4, 4, 4, 6, 6, 6, 6
+]
+
+# convert an x,y (0-7,0-7) to 0-63
+def xy_to_pos(x,y):
+    return x+(y*8)
+
+# convert 0-63 to x,y
+def pos_to_xy(pos):
+    return (pos%8, pos//8)
+
+# callback when pads are pressed
+def handle_pad(x, y, edge):
+    pos = xy_to_pos(x,y)
+    note_val = pos + note_base
+    if edge == NeoTrellis.EDGE_RISING:
+        (pad_on, pad_time) = pad_states[pos] # get pad state & press time
+        print(pad_time)
+        pad_on = not pad_on                  # toggle state
+        pad_states[pos] = (pad_on, time.monotonic()) # and save it w/ new press time
+        print("handle_pad: x,y,pos",x,y, pos, note_val, pad_on)
+        if pad_on:
+            noteon = NoteOn(note_val, note_vel, channel=pad_midi_channel)
+            midi_usb.send(noteon)
+        else:
+            noteoff = NoteOff(note_val, note_vel, channel=pad_midi_channel)
+            midi_usb.send(noteoff)
+
+# called periodically in main loop to receive MIDI msgs
+# saves to pad_state with LED on/off and 0 to indicate pad press acknowledgement
+def midi_receive():
+    msg_in = midi_usb.receive()
+    if msg_in is None:
+        return
+    #print("msg_in:", msg_in.channel, msg_in.note, msg_in.velocity)
+    if msg_in.channel == led_midi_channel:
+        pos = msg_in.note - note_base
+        x,y = pos_to_xy(pos)
+        if isinstance(msg_in, NoteOn):
+            print("midi_receive: LED ON  ",pos, x,y)
+            pad_states[pos] = (True, 0)  # save pad state with press time 0 = acknowledgdd
+            trellis.color(x,y, colors[color_table[pos]])
+        if isinstance(msg_in, NoteOff):
+            print("midi_receive: LED OFF ",pos, x,y)
+            pad_states[pos] = (False, 0) # save pad state with press time 0 = acknowledged
+            trellis.color(x,y, 0x000000)
+
+# attempts to fix the MIDI-CAT bug by retoggling a pad if no LED msg sent
+def send_pad_toggle(pad_on,pos):
+    print("send_pad_toggle",pad_on,pos)
+    note_val = pos + note_base
+    noteon = NoteOn(note_val, note_vel, channel=pad_midi_channel)
+    noteoff = NoteOff(note_val, note_vel, channel=pad_midi_channel)
+    if pad_on:
+        midi_usb.send(noteoff)
+        midi_usb.send(noteon)
+    else:
+        midi_usb.send(noteon)
+        midi_usb.send(noteoff)
+
+# scan list of pads, if any haven't been acknowledged with LED msgs, toggle them
+def pad_ager():
+    for i in range(len(pad_states)):
+        (pad_on, pad_time) = pad_states[i]
+        if (pad_time > 0 and
+            time.monotonic() - pad_time > pad_ager_secs and
+            time.monotonic() - pad_time < pad_ager_secs_max):
+            send_pad_toggle(pad_on,i)
+
+# set up actions for each pad and do a startup light show
+for y_pad in range(8):
+    for x_pad in range(8):
+        trellis.activate_key(x_pad, y_pad, NeoTrellis.EDGE_RISING)
+        trellis.activate_key(x_pad, y_pad, NeoTrellis.EDGE_FALLING)
+        trellis.set_callback(x_pad, y_pad, handle_pad)
+        trellis.color( x_pad, y_pad, PURPLE)
+        time.sleep(0.005)
+
+for y_pad in range(8):  # finish light show
+    for x_pad in range(8):
+        trellis.color(x_pad, y_pad, OFF)
+        time.sleep(0.005)
+
+print("Ready. Be sure VCV Rack2 w/ MIDI-CAT is running and configured")
+last_debug_time = 0
+while True:
+    trellis.sync()
+    midi_receive()
+    pad_ager()
+
+    if time.monotonic() - last_debug_time > 5.0:
+        last_debug_time = time.monotonic()
+        # print("pads:", ''.join(['1' if i else '0' for (i,t) in pad_states]))