Release 1.7.0 - Update tone generator, panic on illegal pin selection

• Allow continuous tone frequency changes (#186)
• Add tone music example (#185)
• Use optimal bundled library names (#183)
• PANIC on attempting an invalid setXXX pin (#182)

Release 1.6.2 - Fix broken 1.6.1 packaging

• Re-add pico-sdk/extra submodules to release ZIP (#181)

Release 1.6.1 - Automated release process

• Add TinyUSB include to all libs (#180)
• Create README describing release publish process (#179)
• CI to update JSON when releases are published (#178)
• Use CI to build draft releases on a tag push (#177)
• Check in Arduino API directory to avoid symlink (#176)

Release 1.6.0 - Bugfixes, new Adafruit board support, CI

• Try to mount Pico drive if not already present during sketch upload (#175)
• Docs: clarify pin assignments for i2c (#173)
• Two board variant definitions and a high speed SPI transfer function (#172)
• Add baud rate to main Serial.begin() (#170)
• Add TinyUSB usage note. (#168)
• CI for style, compilation checks (#166 #163 #159)
• Add quasi-sane abs() implementation to Arduino.h (#157)
• Fix debug level "Wire" compile error (#151)
• Ignore non-UTF8 chars in UF2 upload (#148)

Release 1.5.1 - New USB stack, Adafruit boards, compatibility

• Fix over/underclock support (#147)
• Add Adafruit ItsyBitsy and QTPy RP2040 (#144)
• Port Adafruit_TinyUSB_Arduino lib (#127)
• Add defs for compatibility (#142)
• Add -DBOARD_NAME="{build.board}" (#136)
• Add time support (time, gettimeofday, etc.) (#138)

Release 1.5.0 - New USB stack, Adafruit boards, compatibility

• Add Adafruit ItsyBitsy and QTPy RP2040 (#144)
• Port Adafruit_TinyUSB_Arduino lib (#127)
• Add defs for compatibility (#142)
• Add -DBOARD_NAME="{build.board}" (#136)
• Add time support (time, gettimeofday, etc.) (#138)

Release 1.4.0 - Massive memory/flash savings

• Massively reduce generated code and RAM size (#137)

Blink went from:

Sketch uses 215604 bytes (10%) of program storage space. Maximum is 2093056 bytes.
Global variables use 18152 bytes (6%) of dynamic memory, leaving 243992 bytes for local variables. Maximum is 262144 bytes.

To:

Sketch uses 56112 bytes (5%) of program storage space. Maximum is 1044480 bytes.
Global variables use 12152 bytes (4%) of dynamic memory, leaving 249992 bytes for local variables. Maximum is 262144 bytes.

For a savings of 155KB of flash and 6KB of RAM

Release 1.3.1 - USB Keyboard/Mouse and SPI bug fix

• Add support for shared USB Serial, Keyboard, Mouse (#132)
• Fix SPI default pinouts to SPI0, not SPI1 pins (#135)
• Add missing USB header (d'oh! I need a CI system)

Release 1.2.2 - Minor Cleanup

• Point people to READTHEDOCS for help, not GitHub
• Add stdlib_noniso.h to Arduino.h (#131)
• Added Printable.h in dir where it can be found
• Clean up directory organization, libpico build (#129)
• Clean up platform.txt, libpico build (#128)

Release 1.2.1 - Multicore/tone fixes

• Fix memory leak in tone/noTone calls (#125)
• Minor keyword and mutex fixes for multicore
• Additional multicore fixes, BOOTSEL and PIO (#123)