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能否详细介绍一下GPIOPinTypeKBColumn和GPIOPinTypeKBRow 函数的使用方法

TivaWare Peripheral Driver Library User's Guide,(spmu298)文档关于GPIO章节内提到GPIOPinTypeKBColumn和GPIOPinTypeKBRow两个函数用于矩阵键盘控制,但是所给出的描述比较简单,请教论坛内大神能否提供以上两个函数的详细使用方法,最好能展示一段例程代码,谢谢!!!