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AM3359BZCZA80利用pinmux软件配置管脚问题



假如一块AM3359BZCZA80,我只用到SPI1功能,选择了“H16”管脚做SPI_CLK,当利用pinmux软件进行管脚配置时,配置“E18”和“E17”分别为SPI1_D0,SPI1_D1,都提示为pin conflict,分别为“E18 is not valid for SPI1_IO_Set_1”、“E17 is not valid for SPI1_IO_Set_1”,当我选择"C18"管脚做SPI_CLK,则配置“E18”和“E17”分别为SPI1_D0,SPI1_D1就没有提示错误,请问这是什么原因呢?