avrtos v1.2.1

Key features:

• I2C:
  • Introduce function i2c_master_write_read() enabling to write and
    read data in a single transaction.
  • Rename i2c_master_transmit()) to i2c_master_write().
  • Rename i2c_master_receive() to i2c_master_read().
  • Add option to configure the speed of the I2C bus on initialization.

Minor changes:

• Introduce CONFIG_KERNEL_REENTRANCY configuration option to enable/disable
  reentrancy support for kernel objects, such as mutexes and sched lock/unlock.
• Change code style, update .clang-format and format the codebase.
• Improve stack sentinel verification by introducing a thread monitoring mecanism.
• Introduce CONFIG_THREAD_MONITOR and CONFIG_THREAD_MAIN_MONITOR configuration
  options to enable/disable thread monitoring.
• Introduce CONFIG_THREAD_STACK_SENTINEL_AUTO_VERIFY configuration option to
  enable/disable automatic stack sentinel verification.
• Improve timers subsystem.

Bug fixes:

• Fix returned error code in i2c_master_write() and i2c_master_read().
• Fix K_MSEC macro with big values of CONFIG_KERNEL_SYSCLOCK_PERIOD_US.
• Fix K_WORK_DELAYABLE_INIT macro.

Full Changelog: v1.2.0...v1.2.1

avrtos v1.2.0

Key Features:

• I2C: Introduced a comprehensive I2C driver, and a minimal TCN75 device driver.
• SPI Driver Refactor: Enhanced the SPI driver by introducing the spi_regs intermediate structure, which holds SPI registers.
• Work Queue: Added support for delayable work queue items, with a sample demonstrating this feature.

Minor Changes:

• Stored MCUSR at startup using the CONFIG_KERNEL_MINICORE_SAVE_RESET_CAUSE option.
• Introduced new configuration options:
  • Management of reset cause with CONFIG_KERNEL_MINICORE_SAVE_RESET_CAUSE and CONFIG_KERNEL_CLEAR_WDT_ON_INIT.
  • Addition of an idle hook through CONFIG_IDLE_HOOK.
  • Enabling of the delayable work feature with CONFIG_WORKQUEUE_DELAYABLE.
  • CONFIG_SERIAL_AUTO_INIT.
  • Banner configuration options CONFIG_AVRTOS_BANNER_ENABLE and CONFIG_AVRTOS_BANNER.
  • Various options for the I2C driver.
• Updated samples and documentation.
• Removed unused USART functions and eradicated obsolete code.
• Moved assembly files to src/arch.
• Improved overall error code returns and extended support for CONFIG_KERNEL_ARGS_CHECK.

Bug Fixes:

• Fixed CONFIG_KERNEL_AUTO_INIT with the Arduino framework by utilizing the initVariant() function.

Documentation and Samples:

• Enhanced documentation.
• Added new samples demonstrating various features:
  • MCP3008 and TCN75 driver samples.
  • Arduino sample MinimalExample.

Full Changelog: v1.1.0...v1.2.0

avrtos v1.1.0

Main features:

• SPI: Added SPI drivers for master and slave with full support for atmega328p
  and atmega2560.
• SPI: Added two samples to demonstrate communication between master and slave
  (with data rate and error measurement).
• DevOps: Added Dockerfile and Jenkinsfile for CI/CD.

Bug Fixes:

• Corrected bad characters in a preprocessor #error message.
• Resolved anomalies in the implementation of k_flags_notify() consequently,
  refined the flags sample.
• IRQ are now always enabled when exiting k_thread_stop(), this adjustment
  ensures threads can be safely resumed using k_thread_start().
• Fixed a bug in QEMU preventing to use all timers (patch submitted and attached
  here).

Improvements:

• Improved time functions: introduced k_wait allowing to wait for a specific
  time in a particular mode. Added support for millisecond precision in time API
  through CONFIG_KERNEL_TIME_API_MS_PRECISION.
• Updated and improved documentation.
• Optimized headers inclusions.

Minor changes:

• Introduced K_TICKS to declare timeouts in ticks.
• Introduced macros: FEATURE_TIMER_COUNT and FEATURE_USART_COUNT to ascertain if
  an example can be built for a certain toolchain.
• Enhanced disassembly script for PlatformIO.
• k_work_submittable removed from public API, but k_workqueue_create was added
  to the Arduino keywords list.
• Added sample for testing a single timer.
• Enhanced cmake targets with better ninja support, making ninja the default
  generator.
• Introduced a script for computing code metrics.
• Dead code was purged.
• Help added for thread-ev-spawn example.
• Defined internal macros: Z_THREAD_MAIN_PRIORITY and
  Z_THREAD_MAIN_STACK_END_ADDR.
• Eradicated unused/unfished file descriptor features (fd.c/fd.h).
• Eliminated /______/ code boundaries.

Full Changelog: v1.0.0...v1.1.0

avrtos v1.0.0

AVRTOS is a real-time operating system (RTOS) designed specifically for 8-bit AVR microcontrollers. The project aims to provide an efficient and highly configurable RTOS solution for AVR-based systems. Fully C/C++ compliant, AVRTOS is compatible with the AVR-GCC toolchain, Arduino and PlatformIO frameworks.

Key Features:

• Cooperative and preemptive threads
• Round-robin scheduling without priority support
• Configurable system clock
• Synchronization objects (mutexes, semaphores, workqueues, etc.)
• Drivers for UART, timers, GPIO, and external interrupts
• Thread sleep and scheduler lock/unlock
• Runtime object creation
• Thread canaries and sentinel stack protection
• Events and timers
• Atomic API, logging subsystem, and Uptime API
• Various data structures
• Thread naming, pseudo random number generator, and debug/utils functions

Supported AVR Architectures:

• AVR5: Tested on ATmega328p (Arduino PRO)
• AVR6: Tested on ATmega2560 (Arduino Mega2560)

Full Changelog: https://github.com/lucasdietrich/AVRTOS/commits/v1.0.0

Full Changelog: https://github.com/lucasdietrich/AVRTOS/commits/v1.0.0