CMSIS-RTOS2  Version 2.1.3
Real-Time Operating System: API and RTX Reference Implementation
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RTX v5 Implementation

Keil RTX version 5 (RTX5) implements the CMSIS-RTOS2 as a native RTOS interface for Arm Cortex-M processor-based devices. A translation layer to CMSIS-RTOS API v1 is provided. Therefore, RTX5 can be used in applications that where previously based on RTX version 4 and CMSIS-RTOS version 1 with minimal effort.

The following sections provide further details: