doc: Update example

Author: franky47

examples/AltPinSerial/AltPinSerial.ino

@@ -1,34 +1,36 @@
 #include <MIDI.h>
 
-// Simple tutorial on how to receive and send MIDI messages.
+// Simple tutorial on how to receive and send MIDI messages
+// on a different serial port, using SoftwareSerial.
 // Here, when receiving any message on channel 4, the Arduino
 // will blink a led and play back a note for 1 second.
 
-#if defined(ARDUINO_SAM_DUE) || defined(SAMD_SERIES) 
-   /* example not relevant for this hardware */
+#if defined(ARDUINO_SAM_DUE) || defined(SAMD_SERIES)
+   /* example not relevant for this hardware (SoftwareSerial not supported) */
    MIDI_CREATE_DEFAULT_INSTANCE();
 #else
    #include <SoftwareSerial.h>
+   using Transport = MIDI_NAMESPACE::SerialMIDI<SoftwareSerial>;
    int rxPin = 18;
    int txPin = 19;
    SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);
-   MIDI_NAMESPACE::SerialMIDI<SoftwareSerial> serialMIDI(mySerial);
-   MIDI_NAMESPACE::MidiInterface<MIDI_NAMESPACE::SerialMIDI<SoftwareSerial>> MIDI((MIDI_NAMESPACE::SerialMIDI<SoftwareSerial>&)serialMIDI);
+   Transport serialMIDI(mySerial);
+   MIDI_NAMESPACE::MidiInterface<Transport> MIDI((Transport&)serialMIDI);
 #endif
 
 void setup()
 {
   pinMode(LED_BUILTIN, OUTPUT);
-  MIDI.begin(4);                      // Launch MIDI and listen to channel 4
+  MIDI.begin(4);                    // Launch MIDI and listen to channel 4
 }
 
 void loop()
 {
-  if (MIDI.read())                    // If we have received a message
+  if (MIDI.read())                  // If we have received a message
   {
     digitalWrite(LED_BUILTIN, HIGH);
     MIDI.sendNoteOn(42, 127, 1);    // Send a Note (pitch 42, velo 127 on channel 1)
-    delay(1000);		            // Wait for a second
+    delay(1000);                    // Wait for a second
     MIDI.sendNoteOff(42, 0, 1);     // Stop the note
     digitalWrite(LED_BUILTIN, LOW);
   }