Merge pull request #6 from dmadison/upstream-updatesv1.0.1

Arduino Core 1.8.2

17 files changed, 187 insertions, 334 deletions

diff --git a/boards.txt b/boards.txt
index a91e1a7..a860efb 100644
--- a/boards.txt
+++ b/boards.txt
@@ -120,7 +120,7 @@ leonardoeth.build.extra_flags={build.usb_flags}
 
 ##############################################################
 
-micro.name=Arduino/Genuino Micro w/ XInput
+micro.name=Arduino Micro w/ XInput
 
 micro.vid.0=0x2341
 micro.pid.0=0x0037
@@ -130,24 +130,10 @@ micro.vid.2=0x2A03
 micro.pid.2=0x0037
 micro.vid.3=0x2A03
 micro.pid.3=0x8037
-
 micro.vid.4=0x2341
 micro.pid.4=0x0237
-# If the board is a 2341:0237 use 2341:8237 for build and set
-# other parameters as well
-micro.vid.4.build.vid=0x045E
-micro.vid.4.build.pid=0x028E
-micro.vid.4.build.usb_product="Genuino Micro"
-micro.vid.4.bootloader.file=caterina/Caterina-Genuino-Micro.hex
-
 micro.vid.5=0x2341
 micro.pid.5=0x8237
-# If the board is a 2341:8237 use 2341:8237 for build and set
-# other paramters as well
-micro.vid.5.build.vid=0x045E
-micro.vid.5.build.pid=0x028E
-micro.vid.5.build.usb_product="Genuino Micro"
-micro.vid.5.bootloader.file=caterina/Caterina-Genuino-Micro.hex
 
 micro.upload.tool=avrdude
 micro.upload.protocol=avr109
@@ -382,7 +368,7 @@ yunmini.bootloader.tool=avrdude
 yunmini.bootloader.low_fuses=0xff
 yunmini.bootloader.high_fuses=0xd8
 yunmini.bootloader.extended_fuses=0xfb
-yunmini.bootloader.file=caterina/Caterina-Yunmini.hex
+yunmini.bootloader.file=caterina/Caterina-YunMini.hex
 yunmini.bootloader.unlock_bits=0x3F
 yunmini.bootloader.lock_bits=0x2F
 
diff --git a/bootloaders/caterina/Caterina-Genuino-Micro.hex b/bootloaders/caterina/Caterina-Genuino-Micro.hex
deleted file mode 100644
index b658b28..0000000
--- a/bootloaders/caterina/Caterina-Genuino-Micro.hex
+++ /dev/null
@@ -1,257 +0,0 @@
-:1070000055C000006EC000006CC000006AC00000E7
-:1070100068C0000066C0000064C0000062C00000DC
-:1070200060C000005EC00000F2C400005AC0000052
-:1070300058C0000056C0000054C0000052C00000FC
-:1070400050C0000078C000004CC000004AC00000E2
-:1070500048C0000046C0000044C0000042C000001C
-:1070600040C000003EC000003CC000003AC000002C
-:1070700038C0000036C0000034C0000032C000003C
-:1070800030C000002EC000002CC000002AC000004C
-:1070900028C0000026C0000024C0000022C000005C
-:1070A00020C000001EC000001CC0000011241FBE34
-:1070B000CFEFDAE0DEBFCDBF11E0A0E0B1E0E2E368
-:1070C000FFE702C005900D92A83AB107D9F711E089
-:1070D000A8EAB1E001C01D92AE3BB107E1F78FD342
-:1070E00026C78ECFF89410926F00109281001092F4
-:1070F00085001092840081E085BF15BE47985D9899
-:1071000028980C94000008952091B2013091B301A9
-:107110002F5F3F4F3093B3012093B201932F37FF7E
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-:1071C0008093E9000DC08091E8008B778093E80000
-:1071D00003C08EB3882351F08091E80082FFF9CF7D
-:1071E0008091E80085FFEFCF8091F1000895982FFE
-:1071F00083E08093E9008091E80085FD0DC08091D7
-:10720000E8008E778093E80003C08EB3882369F08E
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-:107230006F927F928F929F92AF92BF92CF92DF9286
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-:10725000E9008091E80082FF57C2289A84E690E016
-:107260009093AB018093AA01AADF182F853481F493
-:107270008CE49DE19093AD018093AC0107B600FCD6
-:10728000FDCFF999FECF81E180935700E89503C0C7
-:10729000843519F494DF8DE00DC28C34E1F3803530
-:1072A000D1F3843721F484E4A2DF80E003C2813685
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-:1072D000330F20E0442737FD4095542F822B932B0A
-:1072E000A42BB52BB8C1803711F483E5E3C18335F6
-:1072F00049F4C0E0D1E089917ADF21E0C730D207BC
-:10730000D1F7D9C1863521F481E371DF80E3D2C1A1
-:10731000833731F487E86BDF85E969DF8EE1CAC125
-:107320008536B9F4E0E0F0E093E085E09093570013
-:10733000E89507B600FCFDCF80935700E89507B6A7
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-:10747000B1012197209709F0BECF7DC08090AE0169
-:107480009090AF01A090B001B090B10196E4691660
-:1074900009F05DC083E0F40180935700E89507B6DA
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-:1074F000AF010093B0011093B10102C060DE582EBD
-:10750000742423C0E090AE01F090AF010091B0016F
-:107510001091B10116950795F794E79450DE682F06
-:10752000C701F7D48091AE019091AF01A091B00155
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-:10754000AF01A093B001B093B101219704C05524BD
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-:1075800071F40091AE011091AF0119DE90E021E09D
-:10759000F8010C0120935700E89511247CCE833626
-:1075A00019F5E090AE01F090AF010091B00110919B
-:1075B000B10105DEF701E16090E021E00C012093CC
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-:1075D000F91E0A1F1B1FE092AE01F092AF0100934B
-:1075E000B0011093B10157CE8D3661F4E091AE0138
-:1075F000F091AF0185E080935700E89507B600FC55
-:10760000FDCF49CE823551F4E091AE01F091AF014A
-:1076100005911491812FEBDD802F4CC0843421F52E
-:10762000E090AE01F090AF010091B0011091B10176
-:1076300016950795F794E794C2DD682FC70169D4C2
-:107640008091AE019091AF01A091B001B091B101D4
-:107650000296A11DB11D8093AE019093AF01A0933E
-:10766000B001B093B10117CE843609F5E090AE01B8
-:10767000F090AF010091B0011091B101D801C701A4
-:10768000B695A795979587953CD4B1DD82E090E0BB
-:10769000A0E0B0E0E80EF91E0A1F1B1FE092AE0149
-:1076A000F092AF010093B0011093B10104C08B318F
-:1076B00011F08FE39CDD83E08093E9009091E80076
-:1076C0008091E8008E778093E80095FF04C010C099
-:1076D0008EB38823C9F08091E80080FFF9CF8091B4
-:1076E000E8008E778093E80003C08EB3882361F0B2
-:1076F0008091E80080FFF9CF84E08093E9008091D9
-:10770000E8008B778093E800DF91CF911F910F9174
-:10771000FF90EF90DF90CF90BF90AF909F908F90B1
-:107720007F906F905F904F9008959091B601892F50
-:107730008F77813249F58091B7018032A1F0813293
-:1077400019F5913A09F58091E800877F8093E80068
-:107750008DE091E067E070E00BD28091E8008B77DC
-:107760008093E8000895913279F48091E800877F52
-:107770008093E8008DE091E067E070E05DD2809159
-:10778000E8008E778093E800089582E061EC42E0A3
-:10779000B5D083E061E842E1B1D084E060E842E145
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-:107820000FBE292F30E0F901E270F07091FD18C011
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diff --git a/bootloaders/caterina/Caterina-Genuino-Micro.txt b/bootloaders/caterina/Caterina-Genuino-Micro.txt
deleted file mode 100644
index fd29bd8..0000000
--- a/bootloaders/caterina/Caterina-Genuino-Micro.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-GENUINO MICRO PRODUCTION FIRMWARES
-==================================
-
-Bootloader:
------------
-
-Name: Caterina-Genuino-Micro.hex
-
-Notes:
-Builds against LUFA version 111009
-make version 3.81
-avrdude version 5.11
-
-All AVR tools except avrdude were installed by CrossPack 20100115:
-avr-gcc version 4.3.3 (GCC)
-Thread model: single
-Configured with: ../configure —prefix=/usr/local/CrossPack-AVR-20100115 —disable-dependency-tracking —disable-nls —disable-werror —target=avr —enable-languages=c,c++ —disable-nls —disable-libssp —with-dwarf2
-avr-libc version 1.6.7
-binutils version 2.19
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h
index 09c1448..91eeb16 100644
--- a/cores/arduino/Arduino.h
+++ b/cores/arduino/Arduino.h
@@ -111,7 +111,8 @@ void yield(void);
 #define bitRead(value, bit) (((value) >> (bit)) & 0x01)
 #define bitSet(value, bit) ((value) |= (1UL << (bit)))
 #define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
-#define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
+#define bitToggle(value, bit) ((value) ^= (1UL << (bit)))
+#define bitWrite(value, bit, bitvalue) ((bitvalue) ? bitSet(value, bit) : bitClear(value, bit))
 
 // avr-libc defines _NOP() since 1.6.2
 #ifndef _NOP
@@ -130,16 +131,16 @@ void initVariant(void);
 
 int atexit(void (*func)()) __attribute__((weak));
 
-void pinMode(uint8_t, uint8_t);
-void digitalWrite(uint8_t, uint8_t);
-int digitalRead(uint8_t);
-int analogRead(uint8_t);
+void pinMode(uint8_t pin, uint8_t mode);
+void digitalWrite(uint8_t pin, uint8_t val);
+int digitalRead(uint8_t pin);
+int analogRead(uint8_t pin);
 void analogReference(uint8_t mode);
-void analogWrite(uint8_t, int);
+void analogWrite(uint8_t pin, int val);
 
 unsigned long millis(void);
 unsigned long micros(void);
-void delay(unsigned long);
+void delay(unsigned long ms);
 void delayMicroseconds(unsigned int us);
 unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout);
 unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout);
@@ -147,8 +148,8 @@ unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout);
 void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val);
 uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder);
 
-void attachInterrupt(uint8_t, void (*)(void), int mode);
-void detachInterrupt(uint8_t);
+void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode);
+void detachInterrupt(uint8_t interruptNum);
 
 void setup(void);
 void loop(void);
diff --git a/cores/arduino/Stream.cpp b/cores/arduino/Stream.cpp
index d284631..9eff663 100644
--- a/cores/arduino/Stream.cpp
+++ b/cores/arduino/Stream.cpp
@@ -218,7 +218,6 @@ size_t Stream::readBytes(char *buffer, size_t length)
 
 size_t Stream::readBytesUntil(char terminator, char *buffer, size_t length)
 {
-  if (length < 1) return 0;
   size_t index = 0;
   while (index < length) {
     int c = timedRead();
diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 0f7d171..47221b8 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -66,6 +66,8 @@ public:
 	void detach();	// Serial port goes down too...
 	void poll();
 	bool wakeupHost(); // returns false, when wakeup cannot be processed
+
+	bool isSuspended();
 };
 extern USBDevice_ USBDevice;
 
diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp
index 6e820a1..b384984 100644
--- a/cores/arduino/USBCore.cpp
+++ b/cores/arduino/USBCore.cpp
@@ -825,4 +825,10 @@ bool USBDevice_::wakeupHost()
 	return false;
 }
 
+bool USBDevice_::isSuspended()
+{
+	return (_usbSuspendState & (1 << SUSPI));
+}
+
+
 #endif /* if defined(USBCON) */
diff --git a/cores/arduino/USBCore.h b/cores/arduino/USBCore.h
index eafdbe5..578e1b8 100644
--- a/cores/arduino/USBCore.h
+++ b/cores/arduino/USBCore.h
@@ -87,6 +87,9 @@
 
 // bMaxPower in Configuration Descriptor
 #define USB_CONFIG_POWER_MA(mA)                ((mA)/2)
+#ifndef USB_CONFIG_POWER
+ #define USB_CONFIG_POWER                      (500)
+#endif
 
 // bEndpointAddress in Endpoint Descriptor
 #define USB_ENDPOINT_DIRECTION_MASK            0x80
@@ -166,7 +169,7 @@ typedef struct
 	{ 18, 1, USB_VERSION, _class,_subClass,_proto,_packetSize0,_vid,_pid,_version,_im,_ip,_is,_configs }
 
 #define D_CONFIG(_totalLength,_interfaces) \
-	{ 9, 2, _totalLength,_interfaces, 1, 0, USB_CONFIG_BUS_POWERED | USB_CONFIG_REMOTE_WAKEUP, USB_CONFIG_POWER_MA(500) }
+	{ 9, 2, _totalLength,_interfaces, 1, 0, USB_CONFIG_BUS_POWERED | USB_CONFIG_REMOTE_WAKEUP, USB_CONFIG_POWER_MA(USB_CONFIG_POWER) }
 
 #define D_INTERFACE(_n,_numEndpoints,_class,_subClass,_protocol) \
 	{ 9, 4, _n, 0, _numEndpoints, _class,_subClass, _protocol, 0 }
diff --git a/cores/arduino/WInterrupts.c b/cores/arduino/WInterrupts.c
index cef1106..38ea158 100644
--- a/cores/arduino/WInterrupts.c
+++ b/cores/arduino/WInterrupts.c
@@ -65,7 +65,6 @@ static volatile voidFuncPtr intFunc[EXTERNAL_NUM_INTERRUPTS] = {
     nothing,
 #endif
 };
-// volatile static voidFuncPtr twiIntFunc;
 
 void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
   if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
@@ -103,6 +102,39 @@ void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
         EICRB = (EICRB & ~((1<<ISC60) | (1<<ISC61))) | (mode << ISC60);
         EIMSK |= (1<<INT6);
         break;
+#elif defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega8U2__)
+    case 0:
+      EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
+      EIMSK |= (1 << INT0);
+      break;
+    case 1:
+      EICRA = (EICRA & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
+      EIMSK |= (1 << INT1);
+      break;
+    case 2:
+      EICRA = (EICRA & ~((1 << ISC20) | (1 << ISC21))) | (mode << ISC20);
+      EIMSK |= (1 << INT2);
+      break;
+    case 3:
+      EICRA = (EICRA & ~((1 << ISC30) | (1 << ISC31))) | (mode << ISC30);
+      EIMSK |= (1 << INT3);
+      break;
+    case 4:
+      EICRB = (EICRB & ~((1 << ISC40) | (1 << ISC41))) | (mode << ISC40);
+      EIMSK |= (1 << INT4);
+      break;
+    case 5:
+      EICRB = (EICRB & ~((1 << ISC50) | (1 << ISC51))) | (mode << ISC50);
+      EIMSK |= (1 << INT5);
+      break;
+    case 6:
+      EICRB = (EICRB & ~((1 << ISC60) | (1 << ISC61))) | (mode << ISC60);
+      EIMSK |= (1 << INT6);
+      break;
+    case 7:
+      EICRB = (EICRB & ~((1 << ISC70) | (1 << ISC71))) | (mode << ISC70);
+      EIMSK |= (1 << INT7);
+      break;
 #elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
@@ -205,7 +237,32 @@ void detachInterrupt(uint8_t interruptNum) {
         break;	
     case 4:
         EIMSK &= ~(1<<INT6);
-        break;	
+        break;
+#elif defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega8U2__)
+    case 0:
+      EIMSK &= ~(1 << INT0);
+      break;
+    case 1:
+      EIMSK &= ~(1 << INT1);
+      break;
+    case 2:
+      EIMSK &= ~(1 << INT2);
+      break;
+    case 3:
+      EIMSK &= ~(1 << INT3);
+      break;
+    case 4:
+      EIMSK &= ~(1 << INT4);
+      break;
+    case 5:
+      EIMSK &= ~(1 << INT5);
+      break;
+    case 6:
+      EIMSK &= ~(1 << INT6);
+      break;
+    case 7:
+      EIMSK &= ~(1 << INT7);
+      break;
 #elif defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EIMSK &= ~(1 << INT0);
@@ -274,11 +331,6 @@ void detachInterrupt(uint8_t interruptNum) {
   }
 }
 
-/*
-void attachInterruptTwi(void (*userFunc)(void) ) {
-  twiIntFunc = userFunc;
-}
-*/
 
 #define IMPLEMENT_ISR(vect, interrupt) \
   ISR(vect) { \
@@ -293,6 +345,17 @@ IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_2)
 IMPLEMENT_ISR(INT3_vect, EXTERNAL_INT_3)
 IMPLEMENT_ISR(INT6_vect, EXTERNAL_INT_4)
 
+#elif defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega8U2__)
+
+IMPLEMENT_ISR(INT0_vect, EXTERNAL_INT_0)
+IMPLEMENT_ISR(INT1_vect, EXTERNAL_INT_1)
+IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_2)
+IMPLEMENT_ISR(INT3_vect, EXTERNAL_INT_3)
+IMPLEMENT_ISR(INT4_vect, EXTERNAL_INT_4)
+IMPLEMENT_ISR(INT5_vect, EXTERNAL_INT_5)
+IMPLEMENT_ISR(INT6_vect, EXTERNAL_INT_6)
+IMPLEMENT_ISR(INT7_vect, EXTERNAL_INT_7)
+
 #elif defined(EICRA) && defined(EICRB)
 
 IMPLEMENT_ISR(INT0_vect, EXTERNAL_INT_2)
@@ -314,11 +377,3 @@ IMPLEMENT_ISR(INT2_vect, EXTERNAL_INT_2)
 #endif
 
 #endif
-
-/*
-ISR(TWI_vect) {
-  if(twiIntFunc)
-    twiIntFunc();
-}
-*/
-
diff --git a/cores/arduino/WString.cpp b/cores/arduino/WString.cpp
index f2572d6..043fda7 100644
--- a/cores/arduino/WString.cpp
+++ b/cores/arduino/WString.cpp
@@ -121,7 +121,7 @@ String::String(double value, unsigned char decimalPlaces)
 
 String::~String()
 {
-	free(buffer);
+	if (buffer) free(buffer);
 }
 
 /*********************************************/
diff --git a/cores/arduino/new.cpp b/cores/arduino/new.cpp
index cf6f89c..fc30cf8 100644
--- a/cores/arduino/new.cpp
+++ b/cores/arduino/new.cpp
@@ -26,6 +26,11 @@ void *operator new[](size_t size) {
   return malloc(size);
 }
 
+void * operator new(size_t size, void * ptr) noexcept {
+  (void)size;
+  return ptr;
+}
+
 void operator delete(void * ptr) {
   free(ptr);
 }
diff --git a/cores/arduino/new.h b/cores/arduino/new.h
index 6e1b68f..763f5cc 100644
--- a/cores/arduino/new.h
+++ b/cores/arduino/new.h
@@ -23,6 +23,7 @@
 
 void * operator new(size_t size);
 void * operator new[](size_t size);
+void * operator new(size_t size, void * ptr) noexcept;
 void operator delete(void * ptr);
 void operator delete[](void * ptr);
 
diff --git a/cores/arduino/wiring_shift.c b/cores/arduino/wiring_shift.c
index 2b6f7a8..a9b3be5 100644
--- a/cores/arduino/wiring_shift.c
+++ b/cores/arduino/wiring_shift.c
@@ -42,10 +42,13 @@ void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
 	uint8_t i;
 
 	for (i = 0; i < 8; i++)  {
-		if (bitOrder == LSBFIRST)
-			digitalWrite(dataPin, !!(val & (1 << i)));
-		else	
-			digitalWrite(dataPin, !!(val & (1 << (7 - i))));
+		if (bitOrder == LSBFIRST) {
+			digitalWrite(dataPin, val & 1);
+			val >>= 1;
+		} else {	
+			digitalWrite(dataPin, (val & 128) != 0);
+			val <<= 1;
+		}
 			
 		digitalWrite(clockPin, HIGH);
 		digitalWrite(clockPin, LOW);		
diff --git a/libraries/SoftwareSerial/src/SoftwareSerial.cpp b/libraries/SoftwareSerial/src/SoftwareSerial.cpp
index 474fe4a..3163d7a 100644
--- a/libraries/SoftwareSerial/src/SoftwareSerial.cpp
+++ b/libraries/SoftwareSerial/src/SoftwareSerial.cpp
@@ -316,7 +316,7 @@ void SoftwareSerial::begin(long speed)
   _tx_delay = subtract_cap(bit_delay, 15 / 4);

 

   // Only setup rx when we have a valid PCINT for this pin

-  if (digitalPinToPCICR(_receivePin)) {

+  if (digitalPinToPCICR((int8_t)_receivePin)) {

     #if GCC_VERSION > 40800

     // Timings counted from gcc 4.8.2 output. This works up to 115200 on

     // 16Mhz and 57600 on 8Mhz.

@@ -357,7 +357,7 @@ void SoftwareSerial::begin(long speed)
     // Enable the PCINT for the entire port here, but never disable it

     // (others might also need it, so we disable the interrupt by using

     // the per-pin PCMSK register).

-    *digitalPinToPCICR(_receivePin) |= _BV(digitalPinToPCICRbit(_receivePin));

+    *digitalPinToPCICR((int8_t)_receivePin) |= _BV(digitalPinToPCICRbit(_receivePin));

     // Precalculate the pcint mask register and value, so setRxIntMask

     // can be used inside the ISR without costing too much time.

     _pcint_maskreg = digitalPinToPCMSK(_receivePin);

diff --git a/libraries/SoftwareSerial/src/SoftwareSerial.h b/libraries/SoftwareSerial/src/SoftwareSerial.h
index b1a37c4..d8b88ce 100644
--- a/libraries/SoftwareSerial/src/SoftwareSerial.h
+++ b/libraries/SoftwareSerial/src/SoftwareSerial.h
@@ -111,13 +111,4 @@ public:
   static inline void handle_interrupt() __attribute__((__always_inline__));

 };

 

-// Arduino 0012 workaround

-#undef int

-#undef char

-#undef long

-#undef byte

-#undef float

-#undef abs

-#undef round

-

 #endif

diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
new file mode 100644
index 0000000..3febbf4
--- /dev/null
+++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
@@ -0,0 +1,75 @@
+// --------------------------------------
+// i2c_scanner
+//
+// Version 1
+//    This program (or code that looks like it)
+//    can be found in many places.
+//    For example on the Arduino.cc forum.
+//    The original author is not know.
+// Version 2, Juni 2012, Using Arduino 1.0.1
+//     Adapted to be as simple as possible by Arduino.cc user Krodal
+// Version 3, Feb 26  2013
+//    V3 by louarnold
+// Version 4, March 3, 2013, Using Arduino 1.0.3
+//    by Arduino.cc user Krodal.
+//    Changes by louarnold removed.
+//    Scanning addresses changed from 0...127 to 1...119,
+//    according to the i2c scanner by Nick Gammon
+//    https://www.gammon.com.au/forum/?id=10896
+// Version 5, March 28, 2013
+//    As version 4, but address scans now to 127.
+//    A sensor seems to use address 120.
+// Version 6, November 27, 2015.
+//    Added waiting for the Leonardo serial communication.
+//
+//
+// This sketch tests the standard 7-bit addresses
+// Devices with higher bit address might not be seen properly.
+//
+
+#include <Wire.h>
+
+void setup() {
+  Wire.begin();
+
+  Serial.begin(9600);
+  while (!Serial); // Leonardo: wait for serial monitor
+  Serial.println("\nI2C Scanner");
+}
+
+void loop() {
+  int nDevices = 0;
+
+  Serial.println("Scanning...");
+
+  for (byte address = 1; address < 127; ++address) {
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    byte error = Wire.endTransmission();
+
+    if (error == 0) {
+      Serial.print("I2C device found at address 0x");
+      if (address < 16) {
+        Serial.print("0");
+      }
+      Serial.print(address, HEX);
+      Serial.println("  !");
+
+      ++nDevices;
+    } else if (error == 4) {
+      Serial.print("Unknown error at address 0x");
+      if (address < 16) {
+        Serial.print("0");
+      }
+      Serial.println(address, HEX);
+    }
+  }
+  if (nDevices == 0) {
+    Serial.println("No I2C devices found\n");
+  } else {
+    Serial.println("done\n");
+  }
+  delay(5000); // Wait 5 seconds for next scan
+}
diff --git a/libraries/Wire/src/utility/twi.c b/libraries/Wire/src/utility/twi.c
index 171af73..1a35146 100644
--- a/libraries/Wire/src/utility/twi.c
+++ b/libraries/Wire/src/utility/twi.c
@@ -445,6 +445,7 @@ ISR(TWI_vect)
     case TW_MR_DATA_ACK: // data received, ack sent
       // put byte into buffer
       twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
+      __attribute__ ((fallthrough));
     case TW_MR_SLA_ACK:  // address sent, ack received
       // ack if more bytes are expected, otherwise nack
       if(twi_masterBufferIndex < twi_masterBufferLength){
@@ -530,6 +531,7 @@ ISR(TWI_vect)
         twi_txBufferLength = 1;
         twi_txBuffer[0] = 0x00;
       }
+      __attribute__ ((fallthrough));		  
       // transmit first byte from buffer, fall
     case TW_ST_DATA_ACK: // byte sent, ack returned
       // copy data to output register