MIDI: support port name strings

Author: kaysievers

src/arduino/Adafruit_USBD_Device.cpp

@@ -126,6 +126,15 @@ void Adafruit_USBD_Device::setSerialDescriptor(const char *s) {
   _desc_str_arr[STRID_SERIAL] = s;
 }
 
+uint8_t Adafruit_USBD_Device::addStringToIndex(const char *s) {
+  if (_desc_str_count >= STRING_DESCRIPTOR_MAX)
+    return 0;
+
+  uint8_t index = _desc_str_count++;
+  _desc_str_arr[index] = s;
+  return index;
+}
+
 void Adafruit_USBD_Device::task(void) { tud_task(); }
 
 bool Adafruit_USBD_Device::mounted(void) { return tud_mounted(); }

src/arduino/Adafruit_USBD_Device.h

@@ -87,6 +87,7 @@ class Adafruit_USBD_Device {
   void setProductDescriptor(const char *s);
   void setSerialDescriptor(const char *s);
   uint8_t getSerialDescriptor(uint16_t *serial_utf16);
+  uint8_t addStringToIndex(const char *s);
 
   //------------- Control -------------//
 

src/arduino/midi/Adafruit_USBD_MIDI.cpp

@@ -105,7 +105,7 @@ uint16_t Adafruit_USBD_MIDI::makeItfDesc(uint8_t itfnum, uint8_t *buf,
 
   // Jack
   for (uint8_t i = 1; i <= _n_cables; i++) {
-    uint8_t jack[] = {TUD_MIDI_DESC_JACK(i)};
+    uint8_t jack[] = {TUD_MIDI_DESC_JACK_DESC(i, _cable_name_strings[i])};
     memcpy(buf + len, jack, sizeof(jack));
     len += sizeof(jack);
   }

src/arduino/midi/Adafruit_USBD_MIDI.h

@@ -34,6 +34,12 @@ class Adafruit_USBD_MIDI : public Stream, public Adafruit_USBD_Interface {
 
   void setCables(uint8_t n_cables);
 
+  // Register the index number of a USB device descriptor string, which was
+  // added with Adafruit_USBD_Device::addStringToIndex().
+  void setCableNameStringIndex(uint8_t index, uint8_t string_index) {
+    _cable_name_strings[index] = string_index;
+  }
+
   bool begin(void);
 
   // for MIDI library
@@ -65,6 +71,7 @@ class Adafruit_USBD_MIDI : public Stream, public Adafruit_USBD_Interface {
 
 private:
   uint8_t _n_cables;
+  uint8_t _cable_name_strings[16]{};
 };
 
 #endif /* ADAFRUIT_USBD_MIDI_H_ */