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https://www.cnblogs.com/pengdonglin137/p/3603166.html
看着办
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void WFI_SET(void) { asm("WFI"); }
void INTX_DISABLE(void) { asm ( "CPSID I" "BX LR" ); }
void INTX_ENABLE(void) { asm ( "CPSIE I" "BX LR " ); }
void MSR_MSP(u32 addr) { asm ( "MSR MSP, r0" "BX r14" ); }
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