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我用的am3359 ice v2开发板，用的TI RTOS，如图所示配置mcspi寄存器的结构体，这个pinMode是什么意思，为什么关于MCSPI_DATA_LINE_COMM_MODE_n的定义注释有三条，一共不就两条数据线吗，为啥有的一条数据线既接收又发送的，谁来帮忙解释下
