• Add get_system_us() to avoid 64bit integer divider
• Improve the way of importing the SysTick handler wrapper.
• Other minor update

• Improve delay accuracy
• Fix RT-Thread stack-fully-used issue
• introduce macro PERF_COUNTER_CFG_USE_SYSTICK_WRAPPER

• Improve the measurement accuracy
• Other minor updates

• Add RT-Thread Package
• Add new API update_perf_counter() for notifying perf_counter that SystemCoreClock has been updated
• Add a macro __perf_counter_printf__ to retarget printf
• Add a macor __PERF_COUNT_PLATFORM_SPECIFIC_HEADER__ for people to insert a platform specific header file.
• Add Doxygen
• Other minor changes

• Add support for Cortex-M85, Star-MC1 and all other Armv8.1-m processors
• Update README

• Enhance the stability of RTOS support
• Other minor update

• Add macro __PERF_COUNTER__ in RTE_Components.h for compile-time detection.
• Add a preprocessing in perf_counter.h to detect GNU extensions.
• Include cmsis-compiler.h in perf_counter.h for using __IRQ_SAFE.
• Enhance RTOS support
  • Add API init_task_cycle_info()
  • Add API enable_task_cycle_info()
  • Add API disable_task_cycle_info()
• Other minor updates

• Fixed issue found in cycleof
• Added macros for version info.
• Add a new feature to measure a chain of tasks in RTOS environment.
• Other minor changes.

• Fixed an issue found in super_loop_monitor
• mitigate warnings for gcc
• Add CI
• Update GCC lib

• Added Support for ThreadX.
  • Due to the limitation of MDK, try to avoid using the assembly source code inside the ac5 porting folders.
  • Due to the limitation of MDK, currently, you have to add the following option to the "ASM" configuration when using assembly source code inside the ac6 porting folder.

-include "Pre_Include_Global.h"

• Added supports for RTOSs that the net cycle information of any given tasks/threads can be measured.
  • Support RTX5
  • Support FreeRTOS
  • Support RT-Thread
• Fixed an issue that start_task_cycle_counter() and stop_task_cycle_counter() might lose some cycle information if there is no context switching in between.
• Other minor updates

• Improve support for IAR
• Fix issue found in foreach
• Introduce __cycle_count__ for __cycleof__ in addition to '_' to avoid confusion.
• Other minor updates

• Add CMSIS-Pack
  • Support Arm Compiler 5, Arm Compiler 6 and Arm GCC
• Improve support for IAR and GCC
• Other minor changes

• Add library support for gcc Use the following command-line option to allow hijacking existing SysTick_Handler

   -Wl,--wrap=SysTick_Handler

• Other minor updates

• Improve the support for IAR using source code.
• Other minor fixes.

• Improved support for GCC
• Update __IRQ_SAFE and safe_atom_code() for the latest CMSIS standard.
• Add macros for compiler detection
• Other minor changes.

• Remove duplicated macro definition
• Remove macro definition "_" which conflicts with other libraries, for example, PLOOC
• Other minor changes

• Improve delay_us accuracy for small delays and long range delays.
• The LOAD register should be treated as (LOAD + 1), this improves the long range delay and measurement.
• Add compensation (tested on Cortex-M3 processors) to delay_us
• Add Arm Compiler 5 (armcc) configuration to example project
• Other small changes

• fixed the racing condition
• introduce a minimal systick LOAD restriction
• add some comments

• Support All Cortex-M Processors
• performance counter
• us level delay: delay_us
• Library suitable for Arm Compiler 5 and Arm Compiler 6 (No IAR or GCC support)
• Auto-initialisation