updated Faderwave code

Author: jedgarpark

Faderwave_Synth/code.py

@@ -5,16 +5,16 @@
     use 16 faders to create the single cycle waveform
     rotary encoder adjusts other synth parameters
     audio output: line level over 3.5mm TRS
-    CV output via DAC '''
+    optional CV output via DAC '''
 
 import board
 import busio
 import ulab.numpy as np
 import rotaryio
-import neopixel
 from digitalio import DigitalInOut, Pull
 import displayio
 from adafruit_display_text import label
+from adafruit_display_shapes.rect import Rect
 import terminalio
 import synthio
 import audiomixer
@@ -30,10 +30,12 @@
 
 displayio.release_displays()
 
+DEBUG = False  # turn on print debugging messages
 ITSY_TYPE = 0  # Pick your ItsyBitsy: 0=M4, 1=RP2040
 
 # neopixel setup for RP2040 only
 if ITSY_TYPE == 1:
+    import neopixel
     pixel = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.3)
     pixel.fill(0x004444)
 
@@ -42,8 +44,8 @@
 midi = adafruit_midi.MIDI(midi_in=usb_midi.ports[0], in_channel=0)
 
 NUM_FADERS = 16
-num_oscs = 2       # how many oscillators for each note
-detune = 0.003  # how much to detune the oscillators
+num_oscs = 1       # how many oscillators for each note to start
+detune = 0.000  # how much to detune the oscillators
 volume = 0.6  # mixer volume
 lpf_freq = 12000  # user Low Pass Filter frequency setting
 lpf_basef = 500     # filter lowest frequency
@@ -54,7 +56,7 @@
 
 # Initialize ADS7830
 adc_a = ADC.ADS7830(i2c, address=0x48)  # default address 0x48
-adc_b = ADC.ADS7830(i2c, address=0x4A)  # A0 jumper 0x49, A1 0x4A
+adc_b = ADC.ADS7830(i2c, address=0x49)  # A0 jumper 0x49, A1 0x4A
 
 faders = []  # list for fader objects on first ADC
 for fdr in range(8):  # add first group to list
@@ -92,42 +94,46 @@
 
 # Create display group
 group = displayio.Group()
-# Create background rectangle
-# bg_rect = Rect(0, 0, display.width, display.height, fill=0x0)
-# group.append(bg_rect)
+
 # Set the font for the text label
 font = terminalio.FONT
 
 # Create text label
-title = label.Label(font, x=2, y=4, text=("Faderwave Synthesizer"), color=0xffffff)
+title = label.Label(font, x=2, y=4, text=("FADERWAVE SYNTHESIZER"), color=0xffffff)
 group.append(title)
 
-title2 = label.Label(font, x=2, y=10, text=("---------------------"), color=0xffffff)
-group.append(title2)
+column_x = (8, 60, 100)
+row_y = (22, 34, 46, 58)
 
-column_x = (20, 90)
-row_y = (22, 34, 48, 60)
+midi_lbl_rect = Rect(column_x[2]-3, row_y[0]-5, 28, 10, fill=0xffffff)
+group.append(midi_lbl_rect)
+midi_lbl = label.Label(font, x=column_x[2], y=row_y[0], text="MIDI", color=0x000000)
+group.append(midi_lbl)
+midi_rect = Rect(column_x[2]-3, row_y[1]-5, 28, 10, fill=0xffffff)
+group.append(midi_rect)
+midi_counter_lbl = label.Label(font, x=column_x[2]+8, y=row_y[1], text='-', color=0x000000)
+group.append(midi_counter_lbl)
 
 # Create menu selector
 menu_sel = 0
-menu_sel_txt = label.Label(font, text=("->"), color=0xffffff)
-menu_sel_txt.x = column_x[0]-16
+menu_sel_txt = label.Label(font, text=(">"), color=0xffffff)
+menu_sel_txt.x = column_x[0]-10
 menu_sel_txt.y = row_y[menu_sel]
 group.append(menu_sel_txt)
 
 # Create detune text
-det_txt_a = label.Label(font, text=("Detune....."), color=0xffffff)
+det_txt_a = label.Label(font, text=("Detune "), color=0xffffff)
 det_txt_a.x = column_x[0]
 det_txt_a.y = row_y[0]
 group.append(det_txt_a)
 
-det_txt_b = label.Label(font, text=(str(0.003)), color=0xffffff)
+det_txt_b = label.Label(font, text=(str(detune)), color=0xffffff)
 det_txt_b.x = column_x[1]
 det_txt_b.y = row_y[0]
 group.append(det_txt_b)
 
 # Create number of oscs text
-num_oscs_txt_a = label.Label(font, text=("Num Oscs..."), color=0xffffff)
+num_oscs_txt_a = label.Label(font, text=("Num Oscs "), color=0xffffff)
 num_oscs_txt_a.x = column_x[0]
 num_oscs_txt_a.y = row_y[1]
 group.append(num_oscs_txt_a)
@@ -138,7 +144,7 @@
 group.append(num_oscs_txt_b)
 
 # Create volume text
-vol_txt_a = label.Label(font, text=("Volume....."), color=0xffffff)
+vol_txt_a = label.Label(font, text=("Volume "), color=0xffffff)
 vol_txt_a.x = column_x[0]
 vol_txt_a.y = row_y[2]
 group.append(vol_txt_a)
@@ -148,9 +154,8 @@
 vol_txt_b.y = row_y[2]
 group.append(vol_txt_b)
 
-
 # Create lpf frequency text
-lpf_txt_a = label.Label(font, text=("LPF........"), color=0xffffff)
+lpf_txt_a = label.Label(font, text=("LPF "), color=0xffffff)
 lpf_txt_a.x = column_x[0]
 lpf_txt_a.y = row_y[3]
 group.append(lpf_txt_a)
@@ -160,7 +165,6 @@
 lpf_txt_b.y = row_y[3]
 group.append(lpf_txt_b)
 
-
 # Show the display group
 display.root_group = group
 
@@ -185,7 +189,7 @@
 
 def faders_to_wave():
     for j in range(NUM_FADERS):
-        wave_user[j] = int(map_range(faders_pos[j], 0, 255, -32768, 32767))
+        wave_user[j] = int(map_range(faders_pos[j], 0, 127, -32768, 32767))
 
 notes_pressed = {}  # which notes being pressed. key=midi note, val=note object
 
@@ -198,6 +202,7 @@ def note_on(n):
         f = fo * (1 + k*detune)
         voices.append(synthio.Note(frequency=f, filter=lpf, envelope=amp_env, waveform=wave_user))
     synth.press(voices)
+    note_off(n)  # help to prevent double note_on for same note which can get stuck
     notes_pressed[n] = voices
 
 def note_off(n):
@@ -209,25 +214,39 @@ def note_off(n):
 def map_range(s, a1, a2, b1, b2):
     return b1 + ((s - a1) * (b2 - b1) / (a2 - a1))
 
+notes_on = 0
+
+print("Welcome to Faderwave")
+
 
 while True:
     #  get midi messages
     msg = midi.receive()
     if isinstance(msg, NoteOn) and msg.velocity != 0:
         note_on(msg.note)
-    elif isinstance(msg, NoteOff) or isinstance(msg, NoteOn) and msg.velocity == 0:
+        notes_on = notes_on + 1
+        if DEBUG:
+            print("MIDI notes on:     ", msg.note, "      Polyphony:", " "*notes_on, notes_on)
+        midi_counter_lbl.text = str(msg.note)
+    elif isinstance(msg, NoteOff) or (isinstance(msg, NoteOn) and msg.velocity == 0):
         note_off(msg.note)
+        notes_on = notes_on - 1
+        if DEBUG:
+            print("MIDI notes off:", msg.note, "          Polyphony:", " "*notes_on, notes_on)
+        midi_counter_lbl.text = "-"
 
     # check faders
     for i in range(len(faders)):
-        faders_pos[i] = faders[i].value//256
+        faders_pos[i] = faders[i].value//512
         if faders_pos[i] is not last_faders_pos[i]:
             faders_to_wave()
             last_faders_pos[i] = faders_pos[i]
+            if DEBUG:
+                print("fader", [i], faders_pos[i])
 
             # send out a DAC value based on fader 0
-            if i == 0:
-                dac.value = faders[0].value
+            # if i == 1:
+            #     dac.value = faders[1].value
 
     # check encoder button
     button.update()
@@ -247,7 +266,7 @@ def map_range(s, a1, a2, b1, b2):
 
         elif menu_sel == 1:
             num_oscs = num_oscs + delta
-            num_oscs = min(max(num_oscs, 1), 8)
+            num_oscs = min(max(num_oscs, 1), 5)
             formatted_num_oscs = str(num_oscs)
             num_oscs_txt_b.text = formatted_num_oscs