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求助



问一个很简单的问题,因为初学,有太多的不懂

        GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_3,GPIO_STRENGTH_4MA,GPIO_PIN_TYPE_STD);
	GPIODirModeSet(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_DIR_MODE_OUT);
	GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3,~GPIO_PIN_3);
很简短的三行,不理解的是第三行,能不能稍微讲的详细一点