stm32CubeIDE中CMSIS_V1和CMSIS_V2選項的區(qū)別

STM32CubeIDE在stm32開發(fā)者起著最基礎的作用，在STM32CubeIDE中配置FreeRTOS中間層時需要選擇interface，其中有三個選項：Disable、CMSIS_V1和CMSIS_V2

CMSIS定義了通用工具接口，并提供一致的設備支持，那么CMSIS_V1和CMSIS_V2有什么區(qū)別呢，該怎選擇呢？

微控制器軟件接口標準CMSIS

CMSIS ARM官方定義如下：

Cortex微控制器軟件接口標準（CMSIS）是獨立于供應商的硬件抽象層，用于基于Arm Cortex處理器的微控制器，并且CMSIS提供了到處理器和外圍設備，實時操作系統(tǒng)以及中間件組件的接口，可以說非常實用。

CMSIS軟件接口簡化了軟件重用，減少了開發(fā)周期，而且也不受限操作系統(tǒng)的類型，去耦。

不同之處

• RTOS v1使得軟件能夠在不同的實時操作系統(tǒng)下運行（屏蔽不同RTOS提供的API的差別）

• 而RTOS v2則是拓展了RTOS v1，兼容更多的CPU架構和實時操作系統(tǒng)。

RTOS v1創(chuàng)建任務函數(shù)如下：

/***********************?Thread?Management?*****************************/
/**
*?@brief??Create?a?thread?and?add?it?to?Active?Threads?and?set?it?to?state?READY.
*?@param??thread_def????thread?definition?referenced?with?\ref?osThread.
*?@param??argument??????pointer?that?is?passed?to?the?thread?function?as?start?argument.
*?@retval?thread?ID?for?reference?by?other?functions?or?NULL?in?case?of?error.
*?@note???MUST?REMAIN?UNCHANGED:?\b?osThreadCreate?shall?be?consistent?in?every?CMSIS-RTOS.
*/
osThreadId?osThreadCreate?(const?osThreadDef_t?*thread_def,?void?*argument)
{
??TaskHandle_t?handle;
??
#if(?configSUPPORT_STATIC_ALLOCATION?==?1?)?&&??(?configSUPPORT_DYNAMIC_ALLOCATION?==?1?)
??if((thread_def->buffer?!=?NULL)?&&?(thread_def->controlblock?!=?NULL))?{
????handle?=?xTaskCreateStatic((TaskFunction_t)thread_def->pthread,(const?portCHAR?*)thread_def->name,
??????????????thread_def->stacksize,?argument,?makeFreeRtosPriority(thread_def->tpriority),
??????????????thread_def->buffer,?thread_def->controlblock);
??}
??else?{
????if?(xTaskCreate((TaskFunction_t)thread_def->pthread,(const?portCHAR?*)thread_def->name,
??????????????thread_def->stacksize,?argument,?makeFreeRtosPriority(thread_def->tpriority),
??????????????&handle)?!=?pdPASS)??{
??????return?NULL;
????}?
??}
#elif(?configSUPPORT_STATIC_ALLOCATION?==?1?)

????handle?=?xTaskCreateStatic((TaskFunction_t)thread_def->pthread,(const?portCHAR?*)thread_def->name,
??????????????thread_def->stacksize,?argument,?makeFreeRtosPriority(thread_def->tpriority),
??????????????thread_def->buffer,?thread_def->controlblock);
#else
??if?(xTaskCreate((TaskFunction_t)thread_def->pthread,(const?portCHAR?*)thread_def->name,
???????????????????thread_def->stacksize,?argument,?makeFreeRtosPriority(thread_def->tpriority),
???????????????????&handle)?!=?pdPASS)??{
????return?NULL;
??}?????
#endif
??
??return?handle;
}

RTOS v2創(chuàng)建任務函數(shù)如下：

osThreadId_t?osThreadNew?(osThreadFunc_t?func,?void?*argument,?const?osThreadAttr_t?*attr)?{
??const?char?*name;
??uint32_t?stack;
??TaskHandle_t?hTask;
??UBaseType_t?prio;
??int32_t?mem;

??hTask?=?NULL;

??if?(!IS_IRQ()?&&?(func?!=?NULL))?{
????stack?=?configMINIMAL_STACK_SIZE;
????prio??=?(UBaseType_t)osPriorityNormal;

????name?=?NULL;
????mem??=?-1;

????if?(attr?!=?NULL)?{
??????if?(attr->name?!=?NULL)?{
????????name?=?attr->name;
??????}
??????if?(attr->priority?!=?osPriorityNone)?{
????????prio?=?(UBaseType_t)attr->priority;
??????}

??????if?((prio??osPriorityISR)?||?((attr->attr_bits?&?osThreadJoinable)?==?osThreadJoinable))?{
????????return?(NULL);
??????}

??????if?(attr->stack_size?>?0U)?{
????????/*?In?FreeRTOS?stack?is?not?in?bytes,?but?in?sizeof(StackType_t)?which?is?4?on?ARM?ports.???????*/
????????/*?Stack?size?should?be?therefore?4?byte?aligned?in?order?to?avoid?division?caused?side?effects?*/
????????stack?=?attr->stack_size?/?sizeof(StackType_t);
??????}

??????if?((attr->cb_mem????!=?NULL)?&&?(attr->cb_size????>=?sizeof(StaticTask_t))?&&
??????????(attr->stack_mem?!=?NULL)?&&?(attr->stack_size?>??0U))?{
????????mem?=?1;
??????}
??????else?{
????????if?((attr->cb_mem?==?NULL)?&&?(attr->cb_size?==?0U)?&&?(attr->stack_mem?==?NULL))?{
??????????mem?=?0;
????????}
??????}
????}
????else?{
??????mem?=?0;
????}

????if?(mem?==?1)?{
??????#if?(configSUPPORT_STATIC_ALLOCATION?==?1)
????????hTask?=?xTaskCreateStatic?((TaskFunction_t)func,?name,?stack,?argument,?prio,?(StackType_t??*)attr->stack_mem,
??????????????????????????????????????????????????????????????????????????????????????(StaticTask_t?*)attr->cb_mem);
??????#endif
????}
????else?{
??????if?(mem?==?0)?{
????????#if?(configSUPPORT_DYNAMIC_ALLOCATION?==?1)
??????????if?(xTaskCreate?((TaskFunction_t)func,?name,?(uint16_t)stack,?argument,?prio,?&hTask)?!=?pdPASS)?{
????????????hTask?=?NULL;
??????????}
????????#endif
??????}
????}
??}

??return?((osThreadId_t)hTask);
}

正常V1夠用了，普通功能選V1，高級功能選擇V2:

我分別選擇CMSIS_V1和CMSIS_V2編譯了兩次進行對比，CMSIS_V2都要大一些。