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GPIO_CFG_OUT_STD输出引脚是主动驱动的高和低，主动驱动什么意思？和普通输出引脚有什么区别 ？
GPIO_CFG_OUT_STR_LOW 引脚强度设置为低，什么意思？什么时候需要设置引脚强度？
#define GPIO_CFG_OUTPUT (((uint32_t) 0) << GPIO_CFG_IO_LSB) /*!< @hideinitializer Pin is an output. */ #define GPIO_CFG_OUT_STD (((uint32_t) 0) << GPIO_CFG_IO_LSB) /*!< @hideinitializer Output pin is actively driven high and low */ #define GPIO_CFG_OUT_OD_NOPULL (((uint32_t) 2) << GPIO_CFG_IO_LSB) /*!< @hideinitializer Output pin is Open Drain */ #define GPIO_CFG_OUT_OD_PU (((uint32_t) 4) << GPIO_CFG_IO_LSB) /*!< @hideinitializer Output pin is Open Drain w/ pull up */ #define GPIO_CFG_OUT_OD_PD (((uint32_t) 6) << GPIO_CFG_IO_LSB) /*!< @hideinitializer Output pin is Open Drain w/ pull dn */ #define GPIO_CFG_OUT_STR_LOW (((uint32_t) 0) << GPIO_CFG_OUT_STRENGTH_LSB) /*!< @hideinitializer Set output pin strength to low */ #define GPIO_CFG_OUT_STR_MED (((uint32_t) 1) << GPIO_CFG_OUT_STRENGTH_LSB) /*!< @hideinitializer Set output pin strength to medium */ #define GPIO_CFG_OUT_STR_HIGH (((uint32_t) 2) << GPIO_CFG_OUT_STRENGTH_LSB) /*!< @hideinitializer Set output pin strength to high */ #define GPIO_CFG_OUT_HIGH (((uint32_t) 1) << GPIO_CFG_OUT_BIT) /*!< @hideinitializer Set pin's output to 1. */ #define GPIO_CFG_OUT_LOW (((uint32_t) 0) << GPIO_CFG_OUT_BIT) /*!< @hideinitializer Set pin's output to 0. */
设置引脚的驱动强度，有些应用需要引脚有高驱动能力
