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_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？

Viki Shi：

#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