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请问专家GPIO 的配置问题：
推挽输出是：GPIO_PIN_TYPE_STD吧
高阻态输入该如何配置？
外设库里 gpio.h 有定义: 去仔细看一看吧
//*****************************************************************************#define GPIO_PIN_TYPE_STD 0x00000008 // Push-pull#define GPIO_PIN_TYPE_STD_WPU 0x0000000A // Push-pull with weak pull-up#define GPIO_PIN_TYPE_STD_WPD 0x0000000C // Push-pull with weak pull-down#define GPIO_PIN_TYPE_OD 0x00000009 // Open-drain#define GPIO_PIN_TYPE_OD_WPU 0x0000000B // Open-drain with weak pull-up#define GPIO_PIN_TYPE_OD_WPD 0x0000000D // Open-drain with weak pull-down#define GPIO_PIN_TYPE_ANALOG 0x00000000 // Analog comparator
貌似没有个高阻态的说法。但是所有的引脚复位时都被配置为非驱动(三态)的。它们的数字功能是禁止的。
GPIO_PIN_TYPE_STD就是输入高阻，不带上拉和下拉电阻。
GPIO_PIN_TYPE_STD_WPU是输入+上拉，
GPIO_PIN_TYPE_STD_WPD是输入+下拉。
