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GPIO的上电默认状态可以参考芯片datasheet的3.16.1 GPIO_MUX1和3.16.2 GPIO_MUX2中的描述：
其中GPIO_MUX1：...each GPIO_MUX1 pin can have a pullup enabled or disabled. By default, all pullups and outputs are disabled on reset...
GPIO_MUX2：Each GPIO_MUX2 pin can have a pullup enabled or disabled. On reset, all pins of the GPIO_MUX2 block are
configured as analog inputs, and the GPIO function is disabled. The GPIO_MUX2 block is programmed
through a separate set of registers from those used to program GPIO_MUX1.
