MSPM0L系列使用过程中的几个汇编嵌入宏定义解析

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/**

  \brief   No Operation

  \details No Operation does nothing. This instruction can be used for code alignment purposes.

 */

#define __NOP()                             __ASM volatile ("nop")



/**

  \brief   Wait For Interrupt

  \details Wait For Interrupt is a hint instruction that suspends execution until one of a number of events occurs.

 */

#define __WFI()                             __ASM volatile ("wfi":::"memory")





/**

  \brief   Wait For Event

  \details Wait For Event is a hint instruction that permits the processor to enter

           a low-power state until one of a number of events occurs.

 */

#define __WFE()                             __ASM volatile ("wfe":::"memory")





/**

  \brief   Send Event

  \details Send Event is a hint instruction. It causes an event to be signaled to the CPU.

 */

#define __SEV()                             __ASM volatile ("sev")

__NOP()  //空延时
__WFI()  //等待中断

__WFE()  //等待事件
__SEV()  //发送事件