GPIO
• Input floating
• Input pull-up
• Input-pull-down
• Analog
• Output open-drain
• Output push-pull
• Alternate function push-pull
• Alternate function open-drain
必须配置成输入模式,三选一(floating, pull-up or pull-down).
必须配置成输出模式,二选一(Push-Pull or Open-Drain).
必须配置成输出模式,二选一(Push-Pull or Open-Drain).这时输入驱动配置为floating。
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