STM32 常用GPIO操作函数记录

STM32读具体GPIOx的某一位是1还是0

 /**
   * @brief  Reads the specified input port pin.
   * @param  GPIOx: where x can be (A..G) to select the GPIO peripheral.
   * @param  GPIO_Pin:  specifies the port bit to read.
   *   This parameter can be GPIO_Pin_x where x can be (0..15).
   * @retval The input port pin value.
   */
 uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
 {
   uint8_t bitstatus = 0x00;

   /* Check the parameters */
   assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
   assert_param(IS_GET_GPIO_PIN(GPIO_Pin)); 

   if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)
   {
     bitstatus = (uint8_t)Bit_SET;
   }
   else
   {
     bitstatus = (uint8_t)Bit_RESET;
   }
   return bitstatus;
 }