Added code to release USB id on CLCD.

Marlin/usb-flashdrive/Fake_Sd2Card_impl.h

@@ -93,8 +93,15 @@ bool Sd2Card::usbHostReady() {
 // Marlin will call this to learn whether an SD card is inserted.
 bool Sd2Card::isInserted() {
    if(usbHostReady()) {
+    const uint8_t lastUsbTaskState = usb.getUsbTaskState();
     usb.Task();
-    return usb.getUsbTaskState() == USB_STATE_RUNNING;
+    const uint8_t newUsbTaskState  = usb.getUsbTaskState();
+    if(lastUsbTaskState == USB_STATE_RUNNING && newUsbTaskState != USB_STATE_RUNNING) {
+      // the user pulled the flash drive. Make sure the bulk storage driver releases the address
+      SERIAL_ECHOLNPGM("Drive removed\n");
+      bulk.Release();
+    }
+    return newUsbTaskState == USB_STATE_RUNNING;
    }
 }
 

Marlin/usb-flashdrive/lib/UsbCore.h

@@ -94,7 +94,7 @@ typedef MAX3421e<P10, P9> MAX3421E; // Official Arduinos (UNO, Duemilanove, Mega
 #define USB_RETRY_LIMIT		3       // 3 retry limit for a transfer
 #define USB_SETTLE_DELAY	200     //settle delay in milliseconds
 
-#define USB_NUMDEVICES		16	//number of USB devices
+#define USB_NUMDEVICES		2	//number of USB devices (changed by marcio@alephobjects.com)
 //#define HUB_MAX_HUBS		7	// maximum number of hubs that can be attached to the host controller
 #define HUB_PORT_RESET_DELAY	20	// hub port reset delay 10 ms recomended, can be up to 20 ms