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最近学习使用PRU_Code_Generation_Tools对PRU单元进行编程，了解PRU可以通过对host2~7写中断，映射到arm的中断事件中；
不过，我还是不太清楚，arm如何调用pru，如何给pru中断请求？请各位前辈指教。
谢谢啦。
