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F28335基于SCI的modbus程序,485通讯引脚配置问题

Other Parts Discussed in Thread: C2000WARE

如图所示F28335 中GPIO61、62、63三个引脚用作485RT1、SCIRXA1、SCITXA1,用来进行485通信,请问在下位机程序中应该如何配置这三个引脚?