1.10.1 - fix conflict with ArduinoCore-API boards

• 1.10.1 (2023-05-25)
  • Remove unnecessary declaration of __FlashStringHelper in AceButton.h.
    • Breaks boards using the ArduinoCore-API, which moved the
      __FlashStringHelper to the arduino:: namespace, while polluting
      the global namespace anyway with a using arduino::__FlashStringHelper shim in an attempt to provide backwards
      compatibility, which doesn't always work.
    • See Issue#120.

1.10.0 - add back SAMD21, SAMD51 to Tier 1; move Teensy boards to Tier 2; add HeartBeat event

• 1.10.0 (2023-05-24)
  • Add AceButton::eventName(event) lookup function
    • Translates the event integer constant (e.g. kEventDoublePressed)
      into a human readable string (e.g. "DoublePressed").
    • Intended for development and debugging.
  • Update supported boards and tiers
    • Add SAMD21 and SAMD51 boards to Tier 1
      • Add 2 SAMD boards from 2 different companies, to test their
        Arduino Core software:
        • Seeeduino XIAO M0 (SAMD21 48MHz ARM Cortex-M0+)
        • Adafruit ItsyBitsy M4 (SAMD51 120MHz ARM Cortex-M4)
      • SAMD21 and SAMD51 boards are back in Tier 1, as long as they use
        the traditional Arduino API instead of the new
        Arduino-Core.
      • Fortunately most third party SAMD21 and SAMD51 boards continue to
        use the traditional Arduino API.
    • Move Teensy 3.2 to Tier 2
      • This board is entering end-of-life.
      • As well, the Teensyduino environment integrates with the Arduino
        IDE and CLI in a way that's different than all other third-party
        Arduino boards. Some of my automation scripts do not work with
        Teensyduino, so it becomes very time consuming to test the Teensy
        boards.
      • All Teensy boards are now in Tier 2 ("Should work but not tested
        often").
  • Add HeartBeat event
    • AceButton::kEventHeartBeat event
    • ButtonConfig::kHeartBeatInterval (default 5000)
    • ButtonConfig::setHeartBeatInterval(uint16)t)
    • ButtonConfig::getHeartBeatInterval()
    • See the Heart Best section in the README.md,
      and the examples/HeartBeat sample application.
    • Memory size impact
      • Increases flash size of ButtonConfig by ~150 bytes on AVR, and
        ~50 bytes on 32-bit processors.
      • Increases RAM size of AceButton by 3 bytes on AVR, and 4 bytes
        on 32-bit processors.
  • Binary Encoded Buttons
    • Derive formula of the number of diodes required to implement
      binary encoded buttons for N lines.
    • total diodes = N * (2^(N-1) - 1)
  • Add extensive Bugs and Limitations section
    in the README.md.
  • Update examples/SimultaneousButtons
    • Simplify transition logic, removing 'concurrent event' option, which
      is too difficult to get right in the time

v1.9.2 - upgrade toolchain; downgrade SAMD21 support; no functional change

• 1.9.2 (2022-02-10)
  • Fix incorrect subtraction of 2 uint16_t integers in
    various examples and README.md docs for 32-bit processors.
    • On 8-bit processors with sizeof(int) == 2, a uint16_t - uint16_t
      returns a uint16_t.
    • But on 32-bit processors with sizeof(int) == 4, a uint16_t - uint16_t returns an int, which returns a negative number if the
      unsigned integer rolled over.
    • The solution is to explicitly add a (uint16_t) cast, which is
      harmless on 8-bit processors, but is required to produce the correct
      value on 32-bit processors.
  • Upgrade various tool chains:
    • Arduino IDE from 1.8.13 to 1.8.19
    • Arduino CLI to 0.20.2
    • Arduino AVR from 1.8.3 to 1.8.4
    • STM32duino from 2.0.0 to 2.2.0
    • ESP8266 from 2.7.4 to 3.0.2
    • ESP32 from 1.0.6 to 2.0.2
    • Teensyduino from 1.53 to 1.56
    • No signficant changes except for LadderButtonConfig on ESP8266
      (faster) and ESP32 (slower).
  • Downgrade support for SAMD21 boards to new "Tier 3: May work but
    unsupported".
    • I can no longer flash my SAMD21 boards as of Arduino IDE 1.8.19.
  • This is a maintenance release. No functional change.

v1.9.1 - upgrade STM32duino to 2.0.0, SparkFun SAMD core to 1.8.3

• 1.9.1 (2021-08-10)
  • Upgrade STM32duino Core from 1.9.0 to 2.0.0.
    • MemoryBenchmark: Flash usage increases by 2.6kB across the board, but
      static RAM goes down by 250 bytes.
    • AutoBenchmark: No change.
    • Very little change to AceButton code itself.
  • Upgrade SparkFun SAMD Core from 1.8.1 to 1.8.3.
    • No change observed in MemoryBenchmark or AutoBenchmark.
  • Add examples/SimultaneousButtons, showing how to detect the simultaneous
    press of 2 buttons.

v1.9 - support ATtiny85; support digitalWriteFast libraries; better LadderButtonConfig support

• 1.9 (2021-06-01)
  • Split LadderButtonCalibrator
    from LadderButtons for convenience.
  • Add preliminary support for ATtiny85 using
    SpenceKonde/ATTinyCore.
  • Add LadderButtonsTiny, a demo of attaching
    2 buttons to the RESET/A0 pin of the ATtiny85 micrcontroller using
    a resistor ladder. This avoids wasting the RESET pin, freeing the other 5
    GPIO pins for other purposes.
  • Update docs and examples for LadderButtonConfig and
    EncodedButtonConfig to prevent the creation of the unused
    SystemButtonConfig.
    • Uses the 4-parameter AceButton() constructor to set the
      buttonConfig parameter explicitly to nullptr.
    • Saves 30 bytes of flash and 26 bytes of RAM on AVR (e.g. ATmega328,
      ATtiny83) processors.
  • Split off examples/Encoded4To2Buttons from
    examples/Encoded8To3Buttons to make the usage of the
    Encoded4To2ButtonConfig and Encoded8To3ButtonConfig classes more
    clear.
  • Add ButtonConfigFast1, ButtonConfigFast2, and ButtonConfigFast3.
    • Implementations of ButtonConfig which use the digitalWriteFast
      library.
    • Saves 100-400 bytes of flash on AVR processors.
    • See README.md#DigitalWriteFast.

v1.8.3 - advise rate-limiting LadderButtonConfig due to problems with analogRead()

• 1.8.3 (2021-04-18)
  • AceButton now has a
    GitHub Discussion.
    • Use that for general questions and discussions.
    • Reserve GitHub Issues
      for bugs and feature requests.
  • Add Rate Limit
    warning on LadderButtonsConfig::checkButtons() should be limited to
    about 200 samples/second. This reduces the overhead of the slow
    analogRead() function, and avoids triggering a bug that disconnects the
    WiFi on the ESP8266.
  • Add general Sampling Rate recommendation to
    sample at about 5 ms intervals, or 200 samples/second. Add code sample
    using non-blocking delay.
  • Update Makefiles used by EpoxyDuino for better compatibility with FreeBSD.
  • Update ESP32 Arduino Core from v1.0.4 to v1.0.6.

v1.8.2 - Update UnixHostDuino 0.4 to EpoxyDuino 0.5

• 1.8.2 (2021-01-22)
  • Update UnixHostDuino 0.4 to EpoxyDuino 0.5.
  • Re-add Teensy 3.2 in AutoBenchmark.
  • No functional change in this release.

v1.8.1 - officially support STM32

• 1.8.1 (2021-01-18)
  • Add official support for STM32 by validating on a "Blue Pill" board.
  • Add scripts to automate collection of AutoBenchmark data. Add
    benchmarks for STM32 microcontroller.
  • No functional change in this release.

v1.8 - add kEventLongReleased event when kEventReleased is suppressed for LongPress

• 1.8 (2020-11-21)
  • Add kEventLongReleased event type which is triggered after a
    kEventLongPressed as a substitute for kEventReleased when
    kFeatureSuppressAfterLongPress is used to suppress the kEventReleased
    event. See the new Distinguishing Pressed and
    LongPressed section in the README.md and
    the new examples/PressedAndLongPressed
    sample code.
  • Potentially Breaking: Completely remove
    src/ace_button/AdjustableButtonConfig.h. It was deprecated over 2 years
    ago in v1.3.

v1.7.1 - add Table of Contents to README.md

• 1.7.1 (2020-11-12)
  • Add Table of Contents to README.md.
  • Regenerate MemoryBenchmark numbers for v1.7.
  • No functional change in this release.