Merge pull request #1615 from jedgarpark/macropad-midi-tester

first commit

Author: kattni

Macropad_MIDI_Tester/code.py

@@ -0,0 +1,93 @@
+# SPDX-FileCopyrightText: 2021 John Park for Adafruit Industries
+# SPDX-License-Identifier: MIT
+# Macropad MIDI Tester
+# Play MIDI notes with keys
+# Click encoder to switch modes
+# Turn encoder to adjust CC, ProgramChange, or PitchBend
+from adafruit_macropad import MacroPad
+from rainbowio import colorwheel
+
+CC_NUM = 74  # select your CC number
+
+macropad = MacroPad(rotation=180)  # create the macropad object, rotate orientation
+
+# --- Pixel setup --- #
+key_color = colorwheel(120)  # fill with cyan to start
+macropad.pixels.brightness = 0.1
+macropad.pixels.fill(key_color)
+
+# --- MIDI variables ---
+mode = 0
+mode_text = ["Patch", ("CC #%s" % (CC_NUM)), "Pitch Bend"]
+midi_values = [0, 16, 8]  # bank, cc value, pitch
+# Chromatic scale starting with C3 as bottom left keyswitch (or use any notes you like)
+midi_notes = [
+            57, 58, 59,
+            54, 55, 56,
+            51, 52, 53,
+            48, 49, 50
+            ]
+
+# --- Display text setup ---
+text_lines = macropad.display_text("Macropad MIDI Tester")
+text_lines[0].text = "Mode: Patch {}".format(midi_values[0]+1)  # Patch display offset by 1
+text_lines[1].text = "Press knob for modes"
+text_lines.show()
+
+last_knob_pos = macropad.encoder  # store knob position state
+
+
+while True:
+
+    key_event = macropad.keys.events.get()  # check for key press or release
+    if key_event:
+        if key_event.pressed:
+            key = key_event.key_number
+            macropad.midi.send(macropad.NoteOn(midi_notes[key], 120))  # send midi noteon
+            macropad.pixels[key] = colorwheel(90)  # light up green
+            text_lines[1].text = "NoteOn:{}".format(midi_notes[key])
+
+        if key_event.released:
+            key = key_event.key_number
+            macropad.midi.send(macropad.NoteOff(midi_notes[key], 0))
+            macropad.pixels[key] = key_color  # return to color set by encoder bank value
+            text_lines[1].text = "NoteOff:{}".format(midi_notes[key])
+
+    macropad.encoder_switch_debounced.update()  # check the knob switch for press or release
+    if macropad.encoder_switch_debounced.pressed:
+        mode = (mode+1) % 3
+        if mode == 0:
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], midi_values[mode]+1))
+        elif mode == 1:
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], int(midi_values[mode]*4.1)))
+        else:
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], midi_values[mode]-8))
+        macropad.red_led = macropad.encoder_switch
+        text_lines[1].text = " "  # clear the note line
+
+    if macropad.encoder_switch_debounced.released:
+        macropad.red_led = macropad.encoder_switch
+
+    if last_knob_pos is not macropad.encoder:  # knob has been turned
+        knob_pos = macropad.encoder  # read encoder
+        knob_delta = knob_pos - last_knob_pos  # compute knob_delta since last read
+        last_knob_pos = knob_pos  # save new reading
+
+        if mode == 0:  # ProgramChange
+            midi_values[mode] = min(max(midi_values[mode] + knob_delta, 0), 127)  # delta + minmax
+            macropad.midi.send(macropad.ProgramChange(midi_values[mode]))  # midi send ProgramChange
+            key_color = colorwheel(midi_values[mode]+120)  # change key_color as patches change
+            macropad.pixels.fill(key_color)
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], midi_values[mode]+1))
+
+        if mode == 1:  # CC
+            midi_values[mode] = min(max(midi_values[mode] + knob_delta, 0), 31)  # scale the value
+            macropad.midi.send(macropad.ControlChange(CC_NUM, int(midi_values[mode]*4.1)))
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], int(midi_values[mode]*4.1)))
+
+        if mode == 2:  # PitchBend
+            midi_values[mode] = min(max(midi_values[mode] + knob_delta, 0), 15)  # smaller range
+            macropad.midi.send(macropad.PitchBend((midi_values[mode]*1024)))  # range * mult = 16384
+            text_lines[0].text = ("Mode: %s %d" % (mode_text[mode], midi_values[mode]-8))
+
+        last_knob_pos = macropad.encoder