CMSIS-RTOS2  Version 2.1.3
Real-Time Operating System: API and RTX Reference Implementation
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Function Overview

CMSIS-RTOS2 provides following API interfaces:

  • CMSIS-RTOS C API v2 is the C function interface that supports dynamic object creation and Armv8-M (Arm Cortex-M23, Cortex-M33 and Cortex-M35P) .
  • CMSIS-RTOS C API v1 is a C function API that is backward compatible with CMSIS-RTOS v1.
  • CMSIS-RTOS C++ API is a C++ class function API (future extension).

It is possible to intermix the different API variants in the same application and even in the same C/C++ source module. However, the functions of the CMSIS-RTOS C API v1 may be deprecated in future versions of CMSIS-RTOS.

CMSIS-RTOS2 defines also a generic system timer interface that works across the supported Arm Cortex processors:

  • OS Tick API is the interface to a kernel system timer.