SAMD CORE 1.6.16 ????.??.??

* USB CDC: fixed issue of available() getting stuck when receiving ZLP's

SAMD CORE 1.6.15 2017.04.27

* Added missing Windows driver for MKRFox1200

* Added SDU support for MKRFox1200

SAMD CORE 1.6.14 2017.04.04

* Fixed platform definition for openocd

* Added bootloader definitions for MKRFox1200

* Added lowpower function on USB subsystem

SAMD CORE 1.6.13 2017.03.31

* Added SDU (SD card Updater) library.

* Fixed 8MHz clock being generated incorrectly. Thanks @keestux

SAMD CORE 1.6.12 2017.02.07

* Fixed type conflict of utoa function. Thanks @kbumsik

* Fixed pinMode(pin, OUTPUT) not working after analogRead(pin)

* Reenabled support for Tian

* Fixed signature for Adafruit Circuit Playground Express board

* Added CMSIS headers for SAML21 chip series. Thanks @aethaniel

SAMD CORE 1.6.11 2016.12.23

* Temporarily disabled support for Arduino Tian until an upload issue is fixed

SAMD CORE 1.6.10 2016.12.23

* Added .org boards

* Fixed MKRZero `build.board` property

* linker: .data section is now aligned to 16 bytes address

* Added support for CRYSTALLESS configurations (thanks @ladyada)

* Added Circuits Playground board

* Added method to automatically retrieve sketch start via linker variable

(see https://github.com/arduino/ArduinoCore-samd/pull/185)

* Fixed USBDevice.epBank1EnableTransferComplete method

* Adapted bootloader source code to CMSIS 4.5

SAMD CORE 1.6.9 2016.12.12

* MKR1000: Enabled PWM on pin 11, it is shared with pin A4

* SPI: Optimized SPI.transfer(...)

* Added linker flags for the ARM Math library

* Added new I2S library

* Bootloader: Check sketch vectors before waiting for double tap

* Upgraded CMSIS version to 4.5.0, and use new CMSIS-Atmel package

* Added Arduino MKRZero board.

SAMD CORE 1.6.8 2016.10.12

* Fixed regression on analogWrite. Thanks @bose-mdellisanti!

* Fixed regression on SerialUSB.available()

* C++ global constructors (if any) are now run after hardware initalization.

SAMD CORE 1.6.7 2016.09.28

* Fixed Serial.flush() blocking before any writes. Thanks @hangmoh

* Added snprintf_P to avr/pgmspace.h stub. Thanks @jantje

* Another small fix to String iterators. Thanks @Ivan-Perez @Chris--A

* Fixes SerialUSB.write(...) returning 0 instead of byte written

* Added Uart::availableForWrite()

* Added defines for RAMSTART, RAMSIZE, RAMEND

* Fixed writing LOW to a digital input pin blocking subsequent digitalRead attempts

* Fixed digitalWrite() unnecessarily activating the pull-up resistor

* Wire: Slave writes now use TX buffer

* Added getTimeout() method to Stream.

* Fixed glitch in PWM generation that may happen when calling analogWrite()

* PWM frequency is now 732.4Hz (before it was 187500.0Hz)

* Fixed PWM/analogwrite() not working on pin 13 on the Zero

* Improved reliability of SerialUSB under heavy load (this should solve

all issues with MKR1000/WiFi101 firmware updater on MacOSX)

* Improved SerialUSB.read() performance

* Added String::toDouble()

* Bootloader: LED now pulses and USB TX/RX blink on transfer (like Leonardo)

* Bootloader: enabled USB string descriptors

SAMD CORE 1.6.6 2016.05.19

* Fixed digitalPinToInterrupt() macro, now it works as documented.

* Added analogInputToDigitalPin macro

* Fixed NUM_DIGITAL_PINS for Zero Board.

* On-board RX-TX LEDs now blinks when there is activity on the native USB port

* Fixed platform.txt, the core now compiles again with Arduino IDE <=1.6.5. Thanks @per1234

* Fixed Wire.write(0x00) "ambiguos method" error

* String class now supports iterators. Thanks @Chris--A

* Remove enabling bootloader protection when burning bootloader. This enables WDT, so sketches do not work.

* Added remote upload for Yun-Shield

SAMD CORE 1.6.5 2016.04.02

* Added Arduino/Genuino MKR1000 board

* Set NVMCTRL.MANW bit to 1 (default is 0). This prevents accidental writes on program memory.

* Bootloader: Fixed wrong UART speed (regression)

* Fixed incorrect return value from Wire.available() when the receive buffer is not fully read.

* Added DAC0 definition in Arduino/Genuino Zero variant file.

* Enabled bootloader protection after "Burn bootloader".

SAMD CORE 1.6.4 2016.02.19

* Fixed Wire address setup when running as slave.

* Fixed String constructor when using floating point numbers.

* USBHost: fixed blocking USBHost.Task(). Thanks @bbx10

* USBHost: fixed some ASCII Control codes in keyboard controller. Thanks @bbx10

* USBHost: ported some minor fix from upstream UHS2. Thanks @bbx10

* USBHost: fixed wrong library initialization. Thanks @bbx10 @ladyada

* better interrupt handling in Serial::accept()

SAMD CORE 1.6.3 2016.02.15

* Added drivers for Arduino/Genuino MKR1000 board

* Fixed Wire master repeated start behaviour

* Added SerialUSB methods: readBreak(), baud(), stopbits(), paritytype(), numbits(), dtr(), rts()

* Added SPI.transfer16(..) method

* Bugfix: added missing Serial.begin(baud, config) method. Thanks @tuxedo0801

* Fixed Serial baudrate calculations for 1200bps. Thanks @TomKeddie

* Fixed Serial.flush() that now waits until the last bit has been sent. Thanks @TomKeddie

* Fixed Serial configuration for data-bit. Thanks @TomKeddie

* Bootloader: 32Khz external oscillator is now used, improves USB clock. Thanks @aethaniel

* Bootloader: Clean up of makefiles and file organization. Thanks @aethaniel

* Added PWM capability to pins A1/A2 of Arduino Zero.

* variant.h/cpp: PWM capability is now determined by PIN_ATTR_PWM combined with

PIN_ATTR_TIMER or PIN_ATTR_TIMER_ALT for timer selection.

* Small fix to USBHost example "USB_desc.ino". Thanks @bbx10

* USBHost: USB-Keyboard right shift key was ignored. Thanks @bbx10

* Wire library now support multiple instances in variant. Thanks @spiderkeys

* Ported some SerialUSB API (readBreak(), baud(), stopbits(), paritytype(), numbits(), dtr(), rts())

SAMD CORE 1.6.2 2015.11.03

* Fixed bug in delay calculations

* Fixed deadlock conditions in Wire. Thanks Erin Tomson

* Print not aborting on write() failure. Thanks @stickbreaker

* SPI can now be configured in variants. Thanks @aethaniel

* Implemented Wire.end

* Fixed external interrupt for pin 8 and 9

* Implemented Wire.setClock. Thanks @PaoloP74

* Wire: allow scanning bus via beginTransmission-endTransmission

* USB Device: big refactoring and bug fix

* USB Device: added PluggableUSB interface

* updated bossac to version 1.6.1-arduino

SAMD CORE 1.6.1 2015.07.21

* Added missing ATN pin definition

* Added missing bootloader key/value pair in boards.txt (this allows to burn bootloader with Sam-ICE too)

* Fixed min/max functions

* Fixed hooks for Cortex-M RTOS

* Fixed acknowledge of UART errors

* Enabled C11/C++11

* Fixed initialization in USB Device

* Updated bossac to version 1.6-arduino

SAMD CORE 1.6.0 2015.06.15

* First public release.