[嵌入式]ARM汇编部分全称（CPSID、CPSIE全称）

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CPS全称Change Processor State，改变处理器状态

IE：Interrupt or abort enable.? 中断使能

ID:?Interrupt or abort disable.?关闭中断

最后面的i：Enables or disables IRQ interrupts.

CPSID?i :?改变处理器的状态，关闭掉irq中断，

CPSIE?i ：打开irq中断

    CPSIE if      ; enable interrupts and fast interrupts
    CPSID A       ; disable imprecise aborts
    CPSID ai, #17 ; disable imprecise aborts and interrupts, and enter FIQ mode
    CPS #16       ; enter User mode

详情请参考ARM的汇编文档：https://developer.arm.com/documentation/dui0489/c/arm-and-thumb-instructions/miscellaneous-instructions/cps