This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.


Cortex-M Software Interface Standard (CMSIS) RTOS is a vendor-independent hardware abstraction layer for the ARM Cortex-M processor series and defines generic tool interfaces. Though it was originally defined for ARM Cortex-M microcontrollers alone, it could be easily extended to other microcontrollers making it generic. For more information on CMSIS RTOS v1, please refer