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STM32读具体GPIOx的某一位是1还是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 }
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