ArduinoCore-samd

What's Changed

• Fixed Serial_::begin(..) definition to match arduino::HardwareSerial by @cmaglie in https://github.com/arduino/ArduinoCore-samd/pull/672
• Document how to add the required link to ArduinoCore-API. by @aentinger in https://github.com/arduino/ArduinoCore-samd/pull/676
• Update I2S.cpp to work with RTCZero library by @Khosos in https://github.com/arduino/ArduinoCore-samd/pull/6...

Regressions fixed:

• Fix upload via openODC (Arduino Zero Programming port)

Fixes:

• SerialCDC now inherits from HardwareSerial (makes it easier to create classes that accept both Serial and Serial1 objects
• Fix USBDevice.connected()
• Align HID library with AVR

Regressions fixed:

• Fix Serial.flush()
• Use 12MHz as maximum SPI speed
• UART: Ringbuffer size is back to 256 bytes

Improvements:

• Refactor programmers menu and add Jlink to the available programmers

Changelog

Fix some bugs exposed by ArduinoCore-API migration

• SPI clock is now limited to F_CPU/2
• RingBuffer access for UART is now IRQ safe (fixes issues with high speed serial communication)
• Get rid of all warnings
• Allow inclusion of <avr/pgmspace.h> (backwards compatibility)

Changelog

First release with ArduinoCore-API support While aiming for maximum backwards compatibility, this will likely expose some "unofficial" behaviours on 3rd party libraries, resulting in compilation errors. We'll work closely with the maintainers to fix them as soon as possibile.

Wire requestFrom can return more than 256 bytes