clean up

Author: hathach

README.md

@@ -7,6 +7,10 @@
 - [Adafruit_nRF52_Arduino](https://github.com/adafruit/Adafruit_nRF52_Arduino)
 - [Adafruit ArduinoCore-samd](https://github.com/adafruit/ArduinoCore-samd) **TinyUSB** must be selected in menu `Tools->USB Stack`
 
-In addition to CDC that provided by the platform core, this library provide platform-independent MSC, HID
+In addition to CDC that provided by the platform core, this library provide platform-independent for
+
+- Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ...
+- Mass Storage Class (MSC): with multiple LUNs
+- Musical Instrument Digital Interface (MIDI)
 
 More document to write ... 

examples/MassStorage/msc_external_flash/msc_external_flash.ino

@@ -69,23 +69,25 @@ void setup()
 
   usb_msc.begin();
 
+  // Init file system on the flash
+  fatfs.begin(&flash);
+
   Serial.begin(115200);
   while ( !Serial ) delay(10);   // wait for native usb
 
   Serial.println("Adafruit TinyUSB Mass Storage External Flash example");
   Serial.print("JEDEC ID: "); Serial.println(flash.getJEDECID(), HEX);
   Serial.print("Flash size: "); Serial.println(flash.size());
 
-  // Init file system on the flash
-  fatfs.begin(&flash);
-
   changed = true; // to print contents initially
 }
 
 void loop()
 {
   if ( changed )
   {
+    changed = false;
+    
     if ( !root.open("/") )
     {
       Serial.println("open root failed");
@@ -114,8 +116,6 @@ void loop()
     root.close();
 
     Serial.println();
-
-    changed = false;
     delay(1000); // refresh every 0.5 second
   }
 }