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通过设置寄存器让948 gpio口输出高低电平

公司新产品,mcu->ds90ub949->ds90ub948->lvds屏,其中ds90ub949的gpio引脚没有与mcu相连,949的gpio功能引脚也没与948相连,请问通过MCU这边的i2c接口操作948或者949的寄存器能让948的gpio输出高低电平吗?