本帖最后由 xyz549040622 于 2023-4-26 15:14 编辑
/**
\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")
__WFI() //等待中断
__WFE() //等待事件
__SEV() //发送事件
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