00. 目录
01. 概述
中断相关代码主要分布在固件库的 stm32f4xx_exti.h 和 stm32f4xx_exti.c 文件中。
02. 相关类型
EXTI模式枚举
/**
* @brief EXTI mode enumeration
*/
typedef enum
{
EXTI_Mode_Interrupt = 0x00,
EXTI_Mode_Event = 0x04
}EXTIMode_TypeDef;
#define IS_EXTI_MODE(MODE) (((MODE) == EXTI_Mode_Interrupt) || ((MODE) == EXTI_Mode_Event))
EXTI触发枚举
/**
* @brief EXTI Trigger enumeration
*/
typedef enum
{
EXTI_Trigger_Rising = 0x08, //上升沿
EXTI_Trigger_Falling = 0x0C, //下降沿
EXTI_Trigger_Rising_Falling = 0x10 //边沿触发
}EXTITrigger_TypeDef;
#define IS_EXTI_TRIGGER(TRIGGER) (((TRIGGER) == EXTI_Trigger_Rising) || \
((TRIGGER) == EXTI_Trigger_Falling) || \
((TRIGGER) == EXTI_Trigger_Rising_Falling))
EXTI初始化结构体
/**
* @brief EXTI Init Structure definition
*/
typedef struct
{
uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.
This parameter can be any combination value 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 EXTITrigger_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;
外部中断线
/** @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 OTG FS Wakeup from suspend event */
#define EXTI_Line19 ((uint32_t)0x80000) /*!< External interrupt line 19 Connected to the Ethernet Wakeup event */
#define EXTI_Line20 ((uint32_t)0x00100000) /*!< External interrupt line 20 Connected to the USB OTG HS (configured in FS) Wakeup event */
#define EXTI_Line21 ((uint32_t)0x00200000) /*!< External interrupt line 21 Connected to the RTC Tamper and Time Stamp events */
#define EXTI_Line22 ((uint32_t)0x00400000) /*!< External interrupt line 22 Connected to the RTC Wakeup event */
#define EXTI_Line23 ((uint32_t)0x00800000) /*!< External interrupt line 23 Connected to the LPTIM Wakeup event */
#define IS_EXTI_LINE(LINE) ((((LINE) & (uint32_t)0xFF800000) == 0x00) && ((LINE) != (uint16_t)0x00))
#define IS_GET_EXTI_LINE(LINE) (((LINE) == EXTI_Line0) || ((LINE) == EXTI_Line1) || \
((LINE) == EXTI_Line2) || ((LINE) == EXTI_Line3) || \
((LINE) == EXTI_Line4) || ((LINE) == EXTI_Line5) || \
((LINE) == EXTI_Line6) || ((LINE) == EXTI_Line7) || \
((LINE) == EXTI_Line8) || ((LINE) == EXTI_Line9) || \
((LINE) == EXTI_Line10) || ((LINE) == EXTI_Line11) || \
((LINE) == EXTI_Line12) || ((LINE) == EXTI_Line13) || \
((LINE) == EXTI_Line14) || ((LINE) == EXTI_Line15) || \
((LINE) == EXTI_Line16) || ((LINE) == EXTI_Line17) || \
((LINE) == EXTI_Line18) || ((LINE) == EXTI_Line19) || \
((LINE) == EXTI_Line20) || ((LINE) == EXTI_Line21) ||\
((LINE) == EXTI_Line22) || ((LINE) == EXTI_Line23))
03. 相关函数
/* Exported macro ------------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/* Function used to set the EXTI configuration to the default reset state *****/
void EXTI_DeInit(void);
/* Initialization and Configuration functions *********************************/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);
/* Interrupts and flags management functions **********************************/
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
void EXTI_ClearFlag(uint32_t EXTI_Line);
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);
void EXTI_ClearITPendingBit(uint32_t EXTI_Line);
04. 结构体封装
外部中断控制器结构体封装
/**
* @brief External Interrupt/Event Controller
*/
typedef struct
{
__IO uint32_t IMR; /*!< EXTI Interrupt mask register, Address offset: 0x00 */
__IO uint32_t EMR; /*!< EXTI Event mask register, Address offset: 0x04 */
__IO uint32_t RTSR; /*!< EXTI Rising trigger selection register, Address offset: 0x08 */
__IO uint32_t FTSR; /*!< EXTI Falling trigger selection register, Address offset: 0x0C */
__IO uint32_t SWIER; /*!< EXTI Software interrupt event register, Address offset: 0x10 */
__IO uint32_t PR; /*!< EXTI Pending register, Address offset: 0x14 */
} EXTI_TypeDef;
05. 附录
5.1 【STM32】STM32系列教程汇总