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c6748中断优先级嵌套问题

各位好,所用平台是c6748,现在想实现中断优先级嵌套,优先级嵌套指的是我预先设置好每个事件的优先级,如中断1优先级是1,中断2优先级是2,且中断1和中断2都是组合事件,且都属于组合事件0,我想实现当中断1的ISR执行时,可以被中断2打断,且不可以被比1小的中断优先级打断。各位能否指点一二,谢谢各位。