STM32讀具體GPIOx的某一位是1還是0

1 /**

2 * @brief Reads the specified input port pin.

3 * @param GPIOx: where x can be (A..G) to select the GPIO peripheral.

4 * @param GPIO_Pin: specifies the port bit to read.

5 * This parameter can be GPIO_Pin_x where x can be (0..15).

6 * @retval The input port pin value.

7 */

8 uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

9 {

10 uint8_t bitstatus = 0x00;

11

12 /* Check the parameters */

13 assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

14 assert_param(IS_GET_GPIO_PIN(GPIO_Pin));

15

16 if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)

17 {

18 bitstatus = (uint8_t)Bit_SET;

19 }

20 else

21 {

22 bitstatus = (uint8_t)Bit_RESET;

23 }

24 return bitstatus;

25 }