1 files changed, 68 insertions, 0 deletions
diff --git a/quantum/process_keycode/process_midi.c b/quantum/process_keycode/process_midi.c
new file mode 100644
index 0000000000..577dad43ac
--- /dev/null
+++ b/quantum/process_keycode/process_midi.c
@@ -0,0 +1,68 @@
+#include "process_midi.h"
+
+bool midi_activated = false;
+uint8_t midi_starting_note = 0x0C;
+int midi_offset = 7;
+
+bool process_midi(uint16_t keycode, keyrecord_t *record) {
+    if (keycode == MI_ON && record->event.pressed) {
+      midi_activated = true;
+#ifdef AUDIO_ENABLE
+      music_scale_user();
+#endif
+      return false;
+    }
+
+    if (keycode == MI_OFF && record->event.pressed) {
+      midi_activated = false;
+      midi_send_cc(&midi_device, 0, 0x7B, 0);
+      return false;
+    }
+
+    if (midi_activated) {
+      if (record->event.key.col == (MATRIX_COLS - 1) && record->event.key.row == (MATRIX_ROWS - 1)) {
+          if (record->event.pressed) {
+              midi_starting_note++; // Change key
+              midi_send_cc(&midi_device, 0, 0x7B, 0);
+          }
+          return false;
+      }
+      if (record->event.key.col == (MATRIX_COLS - 2) && record->event.key.row == (MATRIX_ROWS - 1)) {
+          if (record->event.pressed) {
+              midi_starting_note--; // Change key
+              midi_send_cc(&midi_device, 0, 0x7B, 0);
+          }
+          return false;
+      }
+      if (record->event.key.col == (MATRIX_COLS - 3) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
+          midi_offset++; // Change scale
+          midi_send_cc(&midi_device, 0, 0x7B, 0);
+          return false;
+      }
+      if (record->event.key.col == (MATRIX_COLS - 4) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
+          midi_offset--; // Change scale
+          midi_send_cc(&midi_device, 0, 0x7B, 0);
+          return false;
+      }
+      // basic
+      // uint8_t note = (midi_starting_note + SCALE[record->event.key.col + midi_offset])+12*(MATRIX_ROWS - record->event.key.row);
+      // advanced
+      // uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+12*(MATRIX_ROWS - record->event.key.row);
+      // guitar
+      uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+5*(MATRIX_ROWS - record->event.key.row);
+      // violin
+      // uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+7*(MATRIX_ROWS - record->event.key.row);
+
+      if (record->event.pressed) {
+        // midi_send_noteon(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
+        midi_send_noteon(&midi_device, 0, note, 127);
+      } else {
+        // midi_send_noteoff(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
+        midi_send_noteoff(&midi_device, 0, note, 127);
+      }
+
+      if (keycode < 0xFF) // ignores all normal keycodes, but lets RAISE, LOWER, etc through
+        return false;
+    }
+  return true;
+}