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TMS320F280039C: 示例TIDA-010062的代码中FSI_isRxBaseValid(base)表达式找不到定义位置

Part Number: TMS320F280039C

如图所示,该变量找不到定义位置?不知道该表达式是如何计算的,怎么判断它是true还是false,还是说这个变量其实是个硬件信号??