CMSIS-RTOS API

Version	Description
V1.03 - only documentation changes	Incorporated documentation for reference implementation CMSIS-RTOS RTX.
V1.02 - only documentation changes	Added: Overview of the CMSIS-RTOS Validation Software Pack. Clarified: Behaviour of Timout Value.
V1.02	Added: New control functions for short timeouts in microsecond resolution osKernelSysTick, osKernelSysTickFrequency, osKernelSysTickMicroSec. Removed: osSignalGet.
V1.01	Added capabilities for C++, kernel initialization and object deletion. Prepared for C++ class interface. In this context to const attribute has been moved from osXxxxDef_t typedefs to the osXxxxDef macros. Added: osTimerDelete, osMutexDelete, osSemaphoreDelete. Added: osKernelInitialize that prepares the Kernel for object creation.
V1.00	First official Release. Added: osKernelStart; starting 'main' as a thread is now an optional feature. Semaphores have now the standard behavior. osTimerCreate does no longer start the timer. Added: osTimerStart (replaces osTimerRestart). Changed: osThreadPass is renamed to osThreadYield.
V0.02	Preview Release.

CMSIS-RTOS RTX

Version	Description
V4.82	Corrected: Recursive Mutex 16-bit lock counter is now checked to not overflow.
V4.81	Added provisions for Arm Compiler 6. Corrected: Message Queue behavior when osMessagePut timed out due to full queue and osMessageGet was called from ISR.
V4.80	Restored time delay parameter 'millisec' old behavior (before V4.79) for software compatibility. Corrected: implicit mutex release when mutex owner thread is terminated.
V4.79	Corrected: time delay parameter ‘millisec’ in all functions (osDelay, osSignalWait, …) is now treated as lower bound – wait for at least time given (before it could have been up to 1ms less). Corrected: Lazy Context switching for Cortex-M4 with FPU could lead to a crash when thread which used FPU was terminated. Corrected: osMailCAlloc only cleared the allocated memory block if it was available without waiting. Corrected: osThreadCreate function returns NULL when trying to create more concurrent threads than defined in the configuration. Improved source code MISRA compliance.
V4.78	Corrected: osTimerStart function accepts full 32-bit range for time delay value in milisec. Added: User Timer Callback Queue overflow reported through os_error(OS_ERROR_TIMER_OVF).
V4.77	Added: Stack usage watermark.
V4.76	Optimized Service calls in GCC libraries. Corrected: Stack/Heap regions can be used with scatter loading.
V4.75	Corrected: Service calls for Cortex-M4 with Floating Point for GCC. Corrected: osSignalClear returns 0x80000000 when called from interrupt service routines. Corrected: C standard library memory functions (malloc, free, ...) can be called between calls to osKernelInitialize and osKernelStart. Corrected: Interrupt Priority Group can be configured between calls to osKernelInitialize and osKernelStart.
V4.74	Corrected: osKernelInitialize and osKernelStart when called from main which is already a thread.
V4.73	Corrected: mutex priority inversion when thread owns more than one mutex. Added: RTX extensions os_suspend and os_resume. Added: RTX os_error template.
V4.72	Corrected: object initialization when defined inside function (allocated on stack and not as static memory).
V4.71	Corrected: osMailFree behaviour when osMailAlloc timed out.
V4.70	Added: New control functions for short timeouts in microsecond resolution osKernelSysTick, osKernelSysTickFrequency, osKernelSysTickMicroSec. Removed: osSignalGet.
V4.61	Enhanced: osTimerCreate can now be called after osKernelInitialize (before only after osKernelStart). Corrected: Initialization of alternative kernel timer for Cortex-M0/M0+/M1 (when SysTick timer is not used). Corrected: Message/Mail Queue behavior when timeout expires.
V4.51	Corrected: problem with osKernelInitialize when after the call high priority threads are defined.
V4.50	Based on CMSIS-RTOS API Version 1.01 and the classic RTX V4.50 Kernel. Added: osTimerDelete, osMutexDelete, osSemaphoreDelete. Added: osKernelInitialize that prepares the Kernel for object creation. Added: support for Low Power Cortex-M applications based on new configuration functions: os_suspend, os_resume. Added: support for peripheral timer to be used as OS tick timer instead of Core SysTick timer. Corrected: stack checking did not work for os_tsk_delete_self function Preview Release.
V4.20	Initial CMSIS-RTOS adaption of the RTX Kernel.