RT-Thread implementation of ARM CMSIS-RTOS C API v2

• RT-Thread Library
  • Mandatory flags (in "rtconfig.h")
    • RT_USING_MUTEX
    • RT_USING_SEMAPHORE
    • RT_USING_EVENT
  • Optional flags (in "rtconfig.h")
    • RT_USING_MEMPOOL: To enable osMemoryPoolxxx APIs
    • RT_USING_MESSAGEQUEUE: To use osMessageQueuexxx APIs

The following functions do nothing.

• osKernelSuspend()
• osKernelResume()

• In CMSIS OS APIs, bigger priority number means higher priority
• In RT-Thread, bigger priority number means lower priority

In osThreadSetPriority() and osThreadGetPriority() functions, the following formulas are used for priority conversion.

• rtt_priority = osPriorityISR - cmsis_priority
• cmsis_priority = osPriorityISR - rtt_priority

The default values of osPriorityISR and RT_THREAD_PRIORITY_MAX are 56 and 32. So the available priority range for osThreadSetPriority() function is from osPriorityNormal1 (25) to osPriorityISR (56).

• The msg_prio (message priority) and timeout parameters of osMessageQueuePut() function are ignored. So there is no waiting in the function.
• The *msg_prio (message priority pointer) parameter of osMessageQueueGet() function is ignored.