Added support for Arduino Esplora

hardware/arduino/boards.txt

@@ -167,6 +167,27 @@ leonardo.build.variant=leonardo
 
 ##############################################################
 
+esplora.name=Arduino Esplora
+esplora.upload.protocol=avr109
+esplora.upload.maximum_size=28672
+esplora.upload.speed=57600
+esplora.upload.disable_flushing=true
+esplora.bootloader.low_fuses=0xff
+esplora.bootloader.high_fuses=0xd8
+esplora.bootloader.extended_fuses=0xcb
+esplora.bootloader.path=caterina
+esplora.bootloader.file=Caterina-Esplora.hex
+esplora.bootloader.unlock_bits=0x3F
+esplora.bootloader.lock_bits=0x2F
+esplora.build.mcu=atmega32u4
+esplora.build.f_cpu=16000000L
+esplora.build.vid=0x2341
+esplora.build.pid=0x803C
+esplora.build.core=arduino
+esplora.build.variant=leonardo
+
+##############################################################
+
 micro.name=Arduino Micro
 micro.upload.protocol=avr109
 micro.upload.maximum_size=28672

hardware/arduino/bootloaders/caterina/Descriptors.c

@@ -197,6 +197,8 @@ const USB_Descriptor_String_t ProductString =
 	.UnicodeString          = L"Arduino Leonardo" 
 	#elif DEVICE_PID == 0x0037
 	.UnicodeString			= L"Arduino Micro   "
+	#elif DEVICE_PID == 0x003C
+	.UnicodeString			= L"Arduino Esplora "
 	#else
 	.UnicodeString			= L"USB IO board    "
 	#endif

hardware/arduino/bootloaders/caterina/Makefile

@@ -57,6 +57,8 @@
 # PID = 0x0036
 # official Micro PID
 # PID = 0x0037
+# official Esplora PID
+# PID = 0x003C
 
 # MCU name
 MCU = atmega32u4

hardware/arduino/cores/arduino/USBCore.cpp

@@ -55,6 +55,8 @@ const u16 STRING_IPRODUCT[17] = {
 	'A','r','d','u','i','n','o',' ','L','e','o','n','a','r','d','o'
 #elif USB_PID == 0x8037
 	'A','r','d','u','i','n','o',' ','M','i','c','r','o',' ',' ',' '
+#elif USB_PID == 0x803C
+	'A','r','d','u','i','n','o',' ','E','s','p','l','o','r','a',' '
 #elif USB_PID == 0x9208
 	'L','i','l','y','P','a','d','U','S','B',' ',' ',' ',' ',' ',' '
 #else