if ARCH_ARM_CORTEX_M menu "ARM CMSIS" config RT_USING_CMSIS_OS bool "Using CMSIS RTOS API" default n help Enable CMSIS RTOS API, which is implemented above RT-Thread. config RT_USING_RTT_CMSIS bool "Using CMSIS Header files in RT-Thread" default n help Use CMSIS header files in RT-Thread/components/CMSIS. Otherwise, use the CMSIS header files in BSP. endmenu endif