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omapl138 spi0配置为gpio模式,寄存器写入正确,测试管脚无变化?

我使用的是LCDKOMAPL138开发板,想把SPI0中的CLK_SIMO_SOMI_ENA配置为GPIO模式使用,我唤醒了SPI0模块,在复用管脚寄存器中配置为SPI0功能管脚,在配置了SPIGCR0,SPIGCR1,SPIPC0=0x00000000,SPIPC1=0x00000e00,利用SPIPC4,SPIPC5改变管脚电位,但是用逻辑分析仪分析管脚电位,发现只有ENA高电位,其余为低电平,请问是什么原因。