__set_PRIMASK __disable_irq
时间: 2023-08-24 19:06:52 浏览: 71
__set_PRIMASK和__disable_irq是CMSIS提供的用来操作中断的接口。__set_PRIMASK用于设置PRIMASK寄存器的值,可以用来开启或关闭中断。__disable_irq是调用了__set_PRIMASK来关闭所有中断。通过调用__disable_irq,CPU将不再响应中断请求,但并不会屏蔽中断的触发。如果在关闭总中断后有中断触发,中断标志将被置位。当调用__enable_irq来开启总中断后,之前触发的中断将会立即被处理。要想禁止所有中断,可以对每个模块的中断进行Disable操作,或者通过清除中断标志或清除寄存器状态的方法来达到目的。这样在__enable_irq开启总中断后,MCU就不会响应之前触发的中断了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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