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关于UPP通信中使能信号的控制问题



     UPP事例中的UPP初始化这三句代码,这个引脚配置是uppconfig函数直接就是将uPP_PIN_TRIS | uPP_PIN_ENABLE | uPP_PIN_WAIT | uPP_PIN_START电平拉高了吗?   因为我需要和FPGA通信,想在准备接收数据前给对方发送一个准备信号,想通过将控制信号电平变化来作为发送判断条件,不知道该如何在程序中手动拉高电平?