v2.2.0

CRC and SAMD51 Support

Changed

• Added python version to GitHub actions (for PlatformIO)
• Switched to reusable workflows for GitHub actions
• Consolidated timer prescaler math
• Moved bitTimes and mul8x8to16 functions to the timers files
• Replace c-style casts with c++ style casts
• Do not disable interrupts during Tx for processors over 48MHz
• Cast all timer values and math to the proper type for the processor timer being read
  • SAMD21 boards now use the full 16-bits of the timer rather than only the first 8-bits.
  • AVR xU4 boards (ie, 32u4/Leonardo) still use the 10-bit timer as an 8-bit timer.
• Shortened name of espressif ISR access macro from ESPFAMILY_USE_INSTRUCTION_RAM to ISR_MEM_ACCESS
  • This does not change any functionality of the macro, just the name.
• Moved defines to the top of the SDI12_boards.h file
• Renamed the "tools" directory to "extras" in compliance with Arduino library standards.
• Updated copyright and license texts
• SAMD boards now partially revert clock and prescaler settings when an SDI-12 instance is ended.
  • Prescalers are reset to factory settings, the clock divisor is not reset

Added

• Added CRC checking
• Added support for SAMD51 processors using dedicated timers
• Added parity checking on character reception
  • This can be disabled by defining the macro SDI12_IGNORE_PARITY
• Allowing (without testing) processors over 48MHz to use micros() function
• Added a 'yield' function within stream functions to allow the buffer to fill
  • The yield time can be modified using the macro SDI12_YIELD_MS

Removed

• Offloaded some internal header file documentation to markdown files
• Consolidated redundant READTIME and TCNTX macros, removing TCNTX
• Removed documation m_span commands

Fixed

• Added an extra addition/removal of interrupts for espressif boards in the begin function to properly initialize the interrupts and avoid a later error with the gpio_install_isr_service.

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v2.1.4

Possibly breaking changes

• Reverted the default wake delay to 0ms.
  • In 92055d3 this was bumped up to 10ms, which caused problems for several people.
  • The delay can now also be set using the build flag -D SDI12_WAKE_DELAY=#

v2.1.3 Migrate to GitHub Actions

Improvements

• Migrate from Travis to GitHub actions

v2.1.1 Patches for ATTiny

Bug fixes:

• fixes for the timer and pre-scaler for the ATTiny, courtesy of @gabbas1

v2.1.0 Library Rename and ESP support

To comply with requirements for inclusion in the Arduino IDE, the word Arduino has been removed from the name of this library! The repository name is unchanged.

New features:

• Adds support for Espressif ESP8266 and ESP32
• Add option of adding a delay before sending a command to allow the sensor to wake. Take advantage of this by calling the function sendCommand(command, extraWakeTime). This may resolve issues with some Campbell sensors that would not previous communicate with this library. See https://www.envirodiy.org/topic/campbell-scientific-cs-215-sdi-12-communication-issues-w-mayfly/#post-14103
• Adds Doxygen (Javadoc) style comments to ALL members of the library. The generated documentation is available at https://envirodiy.github.io/Arduino-SDI-12/.

v1.3.6: Fixed extra compiler warnings

A very minor update to fix compiler warnings found when using -Wextra in addition to -Wall.

v1.3.5: Removed SAMD Tone Conflict

SAMD boards will no longer have a conflict with the Tone functions in the Arduino core. AVR boards will still conflict. If you need to use Tone and SDI-12 together for some reason on an AVR boards, you must use the "delayBase" branch.

Examples were also updated and given platformio.ini files.

Timer class

Made the timer changes into a compiled class.

Maintaining interrupt control for SAMD processors as there are no interrupt vectors to be in conflict. Because the pin mode changes from input to output and back, allowing another library to control interrupts doesn't work.

Unset prescalers

Now unsetting timer prescalers and setting the isActive pointer to NULL in both the end and the destructor functions.

Also some clean-up of the examples.

Added processor timer for greater stability

Changed the incoming data ISR to use a processor timer, this makes the reception more stable, especially when the ISR is controlled by an external library. This also creates some conflicts with other libraries that use Timer2.

Also made changes to the write functions to use the timer to reduce the amount of time that all system interrupts are off.

Finally, forcing all SDI-12 objects to use the same buffer to reduce ram usage.