Additional midi note state

Co-authored-by: Oliver Parczyk <oliver.parczyk@mailbox.tu-dresden.de>

src/main.cpp

@@ -1,8 +1,5 @@
 #include <Arduino.h>
 
-#define MIDI_NAME {'P', 'i', 'n', 'g', 'b', 'o', 'a', 'r', 'd'}
-#define MIDI_NAME_LEN 9
-
 #define KEY_GROUP_NUM 9
 #define KEY_PINS 6
 #define NUMBER_OF_KEYS 49
@@ -17,6 +14,8 @@ const uint8_t group_pins[KEY_GROUP_NUM] {14, 15, 16, 17, 18, 19, 20, 21, 22};
 const uint8_t key_pins[KEY_PINS] {2, 3, 4, 5, 6, 7};
 // Array of pressed keys (initially all 0)
 uint8_t keys_pressed[NUMBER_OF_KEYS];
+// Array of currently active midi notes
+bool active_notes[NUMBER_OF_KEYS];
 // K1, K2, K3, K4, K5, K12, K13, K14, K15
 const uint8_t self_drive_pins[KEY_GROUP_NUM] {8, 9, 10, 11, 12, 26, 23, 24, 25};
 uint8_t current_self_drive_pin = 0;
@@ -72,8 +71,9 @@ int8_t getActiveKeyGroup() {
 
 // Set the next self drive pin
 FASTRUN void nextSelfDrivePin() {
-  // Set the current pin to high
+  // Set previous pin to low
   digitalWriteFast(self_drive_pins[current_self_drive_pin != 0 ? current_self_drive_pin - 1 : KEY_GROUP_NUM - 1], LOW);
+  // Set the current pin to high
   digitalWriteFast(self_drive_pins[current_self_drive_pin], HIGH);
   // Set the next pin
   current_self_drive_pin = (current_self_drive_pin + 1) % KEY_GROUP_NUM;
@@ -114,7 +114,9 @@ void loop() {
       // ! inverted
       if (value == LOW) { 
         // Check if the key is not already pressed
-        if (keys_pressed[active_key_group * 6 + i] >= DEBOUNCE_TIMES) {
+        if (keys_pressed[active_key_group * 6 + i] >= DEBOUNCE_TIMES && !active_notes[active_key_group * 6 + i]) {
+          // Note is on
+          active_notes[active_key_group * 6 + i] = true;
           // Send MIDI message
           usbMIDI.sendNoteOn(mapToMidi(active_key_group, i), 127, 1);
         }
@@ -123,7 +125,9 @@ void loop() {
         keys_pressed[active_key_group * 6 + i] += keys_pressed[active_key_group * 6 + i] < 0xFF ? 1 : 0;
       } else {
         // Check if the key is not already released
-        if (keys_pressed[active_key_group * 6 + i] < DEBOUNCE_TIMES) {
+        if (keys_pressed[active_key_group * 6 + i] < DEBOUNCE_TIMES && active_notes[active_key_group * 6 + i]) {
+          // Note is off
+          active_notes[active_key_group * 6 + i] = false;
           // Send MIDI message
           usbMIDI.sendNoteOff(mapToMidi(active_key_group, i), 0, 1);
         }

src/name.c

@@ -0,0 +1,13 @@
+// To give your USB MIDI device a unique name, this code must be placed into a .c file (its own tab).  It can not be in a .cpp file or your main sketch (the .ino file).
+#include "usb_names.h"
+
+// Edit these lines to create your own name.  The length must match the number of characters in your custom name.
+#define MIDI_NAME {'P', 'i', 'n', 'g', 'b', 'o', 'a', 'r', 'd'}
+#define MIDI_NAME_LEN 9
+
+// Do not change this part.  This exact format is required by USB.
+struct usb_string_descriptor_struct usb_string_product_name = {
+    2 + MIDI_NAME_LEN * 2,
+    3,
+    MIDI_NAME
+};