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TMS320C6678: 关于对chip registers赋值的问题

Part Number: TMS320C6678

在查看Keystone_SDK_Packet里面提供的例程的时候发现,在配置中断的时候是通过函数

来使能interrupt,请问这里的ICR和IER等chip registers为什么可以这样子赋值呢?

右键open declaration是没有相关定义的,为什么可以通过这种方式设置到相关寄存器呢?