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AM335x starterware为什么进入中断ISR后会关闭中断,难道不能中断嵌套?



如题,用仿真器发现进入ISR程序后,CPSR的I位变成1了。

还有个问题,进入中断ISR程序前的压栈动作在哪执行?保存的栈指针在哪里?