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6678GPio 库函数

我想控制Gpio 4 

代码是不是 这样写   

CSL_GpioHandle        hnd;

hnd = CSL_GPIO_open(0);

CSL_GPIO_setPinDirOutput(hnd, 4);

CSL_GPIO_ setOutPutData (hnd,4);

这样引脚4是不是输出高电平?

如果想输出低电平呢