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在将一个GPIO口配制成输出时，正确步骤是应该先用GPySET, GPyCLEAR这些寄存器给这个GPIO口一个固定的电平，再用GPyDIR寄存器设置为output吧
你可以参考controlSUITE中的例程，如：C:\ti\controlSUITE\device_support\F2837xD\v130\F2837xD_examples_Cpu1\gpio_setup
例如GPIO8初始化：
GpioCtrlRegs.GPAPUD.bit.GPIO8 = 0; // Enable pullup on GPIO8 GpioDataRegs.GPASET.bit.GPIO8 = 1; // Load output latch GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 0; // GPIO8 = GPIO8 GpioCtrlRegs.GPADIR.bit.GPIO8 = 1; // GPIO8 = output
