/** * @brief Selects the GPIO pin used as EXTI Line. * @param GPIO_PortSource: selects the GPIO port to be used as source for EXTI lines. * This parameter can be GPIO_PortSourceGPIOx where x can be (A..G). * @param GPIO_PinSource: specifies the EXTI line to be configured. * This parameter can be GPIO_PinSourcex where x can be (0..15). * @retval None */ voidGPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource)
typedefstruct { uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled. This parameter can be any combination of @ref EXTI_Lines */ EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines. This parameter can be a value of @ref EXTIMode_TypeDef */
EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines. This parameter can be a value of @ref EXTIMode_TypeDef */
FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines. This parameter can be set either to ENABLE or DISABLE */ }EXTI_InitTypeDef;
EXTI_Line：设置EXTI lines的组合
/** @defgroup EXTI_Lines * @{ */
#define EXTI_Line0 ((uint32_t)0x00001) /*!< External interrupt line 0 */ #define EXTI_Line1 ((uint32_t)0x00002) /*!< External interrupt line 1 */ #define EXTI_Line2 ((uint32_t)0x00004) /*!< External interrupt line 2 */ #define EXTI_Line3 ((uint32_t)0x00008) /*!< External interrupt line 3 */ #define EXTI_Line4 ((uint32_t)0x00010) /*!< External interrupt line 4 */ #define EXTI_Line5 ((uint32_t)0x00020) /*!< External interrupt line 5 */ #define EXTI_Line6 ((uint32_t)0x00040) /*!< External interrupt line 6 */ #define EXTI_Line7 ((uint32_t)0x00080) /*!< External interrupt line 7 */ #define EXTI_Line8 ((uint32_t)0x00100) /*!< External interrupt line 8 */ #define EXTI_Line9 ((uint32_t)0x00200) /*!< External interrupt line 9 */ #define EXTI_Line10 ((uint32_t)0x00400) /*!< External interrupt line 10 */ #define EXTI_Line11 ((uint32_t)0x00800) /*!< External interrupt line 11 */ #define EXTI_Line12 ((uint32_t)0x01000) /*!< External interrupt line 12 */ #define EXTI_Line13 ((uint32_t)0x02000) /*!< External interrupt line 13 */ #define EXTI_Line14 ((uint32_t)0x04000) /*!< External interrupt line 14 */ #define EXTI_Line15 ((uint32_t)0x08000) /*!< External interrupt line 15 */ #define EXTI_Line16 ((uint32_t)0x10000) /*!< External interrupt line 16 Connected to the PVD Output */ #define EXTI_Line17 ((uint32_t)0x20000) /*!< External interrupt line 17 Connected to the RTC Alarm event */ #define EXTI_Line18 ((uint32_t)0x40000) /*!< External interrupt line 18 Connected to the USB Device/USB OTG FS Wakeup from suspend event */ #define EXTI_Line19 ((uint32_t)0x80000) /*!< External interrupt line 19 Connected to the Ethernet Wakeup event */ 。。。
/** * @brief Initializes the EXTI peripheral according to the specified * parameters in the EXTI_InitStruct. * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure * that contains the configuration information for the EXTI peripheral. * @retval None */ voidEXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
/** * @brief Configures the priority grouping: pre-emption priority and subpriority. * @param NVIC_PriorityGroup: specifies the priority grouping bits length. * This parameter can be one of the following values: * @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority * 4 bits for subpriority * @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority * 3 bits for subpriority * @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority * 2 bits for subpriority * @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority * 1 bits for subpriority * @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority * 0 bits for subpriority * @retval None */ voidNVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup) { /* Check the parameters */ assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup)); /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */ SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup; }
typedefstruct { uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled. This parameter can be a value of @ref IRQn_Type (For the complete STM32 Devices IRQ Channels list, please refer to stm32f10x.h file) */
uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel specified in NVIC_IRQChannel. This parameter can be a value between 0 and 15 as described in the table @ref NVIC_Priority_Table */
uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified in NVIC_IRQChannel. This parameter can be a value between 0 and 15 as described in the table @ref NVIC_Priority_Table */
FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel will be enabled or disabled. This parameter can be set either to ENABLE or DISABLE */ } NVIC_InitTypeDef;
NVIC_IRQChannelPreemptionPriority：设置抢占优先级 int NVIC_IRQChannelSubPriority：设置响应优先级 int
NVIC_IRQChannelCmd：设置是否使用中断通道
ENABLE DISABLE
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
初始化NVIC
/** * @brief Initializes the NVIC peripheral according to the specified * parameters in the NVIC_InitStruct. * @param NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains * the configuration information for the specified NVIC peripheral. * @retval None */ voidNVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
/** * @brief Checks whether the specified EXTI line is asserted or not. * @param EXTI_Line: specifies the EXTI line to check. * This parameter can be: * @arg EXTI_Linex: External interrupt line x where x(0..19) * @retval The new state of EXTI_Line (SET or RESET). */ ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
参数：EXTI_Line(0..19) PinB14是EXTI_Line14
返回值：SET or RESET
还需要注意的是中断结束后需要清除中断标志位使用EXTI_ClearITPendingBit函数
/** * @brief Clears the EXTI's line pending bits. * @param EXTI_Line: specifies the EXTI lines to clear. * This parameter can be any combination of EXTI_Linex where x can be (0..19). * @retval None */ voidEXTI_ClearITPendingBit(uint32_t EXTI_Line)
参数：EXTI_Line(0..19) PinB14是EXTI_Line14
这样，整体就完成了
voidEXTI15_10_IRQHandler(void) { if (EXTI_GetITStatus(EXTI_Line14) == SET) { EXTI_ClearITPendingBit(EXTI_Line14); } }
