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我在开发L138的DSP的时候，需要用到中断嵌套，不知道怎样实现，也没发现有什么文档讲解了。请多多指教，谢谢！
下面文档第5.6.2 Nested Interrupts章节有讲中断嵌套。http://www.ti.com/lit/ug/sprufe8b/sprufe8b.pdf
主要是在进中断的时候不要关中断就可以嵌套。
注意嵌套层数不能太多，否则会栈溢出
