STM32库函数uint8_t GPIO_ReadInputDataBit ( GPIO_TypeDef * GPIOx, uint16_t GPIO_Pin )
uint8_tGPIO_ReadInputDataBit(GPIO_TypeDef*GPIOx,uint16_tGPIO_Pin)Readsthespecifiedinputportpin.Parameters:GPIOx,:wherexcanbe(A..G)toselecttheGPIOperipheral.GPIO_Pin,:specifiestheportbittoread.Thispara