feat(usb_midi): Refactor USBMIDI with device name handling

Author: SuGlider

libraries/USB/src/USBMIDI.cpp

@@ -6,19 +6,23 @@
 #include "Arduino.h"
 #include "esp32-hal-tinyusb.h"
 
+// Initialize static members
+const char* USBMIDI::deviceName = nullptr;
+char USBMIDI::nameBuffer[32] = {0};
+
 // Default Cable Number (for simplified APIs that do not expose this)
 #define DEFAULT_CN 0
 
 static bool tinyusb_midi_descriptor_loaded = false;
 static bool tinyusb_midi_interface_enabled = false;
-static String deviceDescriptor("");
 
 extern "C" uint16_t tusb_midi_load_descriptor(uint8_t *dst, uint8_t *itf) {
   if (tinyusb_midi_descriptor_loaded) {
     return 0;
   }
   tinyusb_midi_descriptor_loaded = true;
-  uint8_t str_index = tinyusb_add_string_descriptor(deviceDescriptor.c_str());
+
+  uint8_t str_index = tinyusb_add_string_descriptor(USBMIDI::getCurrentDeviceName());
   uint8_t ep_in = tinyusb_get_free_in_endpoint();
   TU_VERIFY(ep_in != 0);
   uint8_t ep_out = tinyusb_get_free_out_endpoint();
@@ -32,10 +36,21 @@ extern "C" uint16_t tusb_midi_load_descriptor(uint8_t *dst, uint8_t *itf) {
   return TUD_MIDI_DESC_LEN;
 }
 
-USBMIDI::USBMIDI(String devDescName) {
+USBMIDI::USBMIDI() {
+  if (!tinyusb_midi_interface_enabled) {
+    tinyusb_midi_interface_enabled = true;
+    tinyusb_enable_interface(USB_INTERFACE_MIDI, TUD_MIDI_DESC_LEN, tusb_midi_load_descriptor);
+  } else {
+    log_e("USBMIDI: Multiple instances of USBMIDI not supported!");
+  }
+}
+
+USBMIDI::USBMIDI(const char* name) {
   if (!tinyusb_midi_interface_enabled) {
+    strncpy(nameBuffer, name, sizeof(nameBuffer) - 1);
+    nameBuffer[sizeof(nameBuffer) - 1] = '\0';
+    deviceName = nameBuffer;
     tinyusb_midi_interface_enabled = true;
-    deviceDescriptor = devDescName;
     tinyusb_enable_interface(USB_INTERFACE_MIDI, TUD_MIDI_DESC_LEN, tusb_midi_load_descriptor);
   } else {
     log_e("USBMIDI: Multiple instances of USBMIDI not supported!");