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STM32,八种GPIO输入输出模式，按照端口配置寄存器应该是用4位表示，为什么官方库里要这样枚举？
typedef enum
{ GPIO_Mode_AIN = 0x0,
GPIO_Mode_IN_FLOA
tiNG = 0x04,
GPIO_Mode_IPD = 0x28,
GPIO_Mode_IPU = 0x48,
GPIO_Mode_Out_OD = 0x14,
GPIO_Mode_Out_PP = 0x10,
GPIO_Mode_AF_OD = 0x1C,
GPIO_Mode_AF_PP = 0x18
}GPIOMode_TypeDef;
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