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TMS320F280039C: Ecap输入源选择部分被注释,观察寄存器发现选择的是127,请问这个GPTRIP7 input for instance ECAP1具体是什么

Part Number: TMS320F280039C

软件运行正常,ecap中断也能进去,我无法理解捕获的脉冲从哪来的,望大佬解答