@
目录嵌套向量中断控制器(NVIC)和处理器核的接口紧密相连,可以实现低延迟的中断处理和高效地处理晚到的中断
//官方文档 typedef struct //结构体 { 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_PriorityGroupConfig //设置优先级分组:先占优先级和从优先级 NVIC_Init //根据 NVIC_InitStruct 中指定的参数初始化外设 NVIC 寄存器
//官方文档 typedef struct //结构体 { 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_Init //根据 EXTI_InitStruct 中指定的参数初始化外设 EXTI 寄存器
GPIO引脚 | 中断标志位 | 中断处理函数 |
---|---|---|
PA0~PG0 | EXTI0 | EXTI0_IRQHandler |
PA1~PG1 | EXTI1 | EXTI1_IRQHandler |
PA2~PG2 | EXTI2 | EXTI2_IRQHandler |
PA3~PG3 | EXTI3 | EXTI3_IRQHandler |
PA4~PG4 | EXTI4 | EXTI4_IRQHandler |
PA5~PG5 | EXTI5 | EXTI9_5_IRQHandler |
~ | ||
PA10~PG10 | EXTI10 | EXTI15_10_IRQHandler |
~ | ||
PA15~PG15 | EXTI15 |
//bsp_exti.c #include "bsp_exti.h" #include <misc.h> #include <stm32f10x_gpio.h> #include <stm32f10x_exti.h> #include <stm32f10x_rcc.h> void PA0_EXTI0_Configuration(void) { //定义结构体 NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; //开启时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO , ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //设置优先级分组 NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //选择中断类型 外部中断线0 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //响应先级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外设NVIC NVIC_Init(&NVIC_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); //选择GPIO管脚用作外部中断线路 EXTI_InitStructure.EXTI_Line = EXTI_Line0; //使能外部线路0 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //请求模式 中断请求 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //触发模式为下降沿触发 EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能外设EXTI EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //选择中断类型 外部中断线0 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //响应先级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外设NVIC NVIC_Init(&NVIC_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource5); //选择GPIO管脚用作外部中断线路 EXTI_InitStructure.EXTI_Line = EXTI_Line5; //使能外部线路0 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //请求模式 中断请求 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //触发模式为下降沿触发 EXTI_InitStructure.EXTI_LineCmd = ENABLE; //使能外设EXTI EXTI_Init(&EXTI_InitStructure); } void EXTI0_IRQHandler(void) { //检测指定的EXTI线路中断请求发生与否 消抖 if(EXTI_GetITStatus(EXTI_Line0) != RESET) { GPIOA->ODR ^= GPIO_Pin_1; EXTI_ClearITPendingBit(EXTI_Line0);//清除中断标志位 } } void EXTI9_5_IRQHandler(void) { //检测指定的EXTI线路中断请求发生与否 消抖 if(EXTI_GetITStatus(EXTI_Line5) != RESET) { GPIOA->ODR ^= GPIO_Pin_4; EXTI_ClearITPendingBit(EXTI_Line5);//清除中断标志位 } }
//bsp_exti.h #ifndef __BSP_EXTI_H__ #define __BSP_EXTI_H__ #include <stm32f10x.h> void PA0_EXTI0_Configuration(void); #endif
//效果 PA0 PA5按键响应中断并取反相应LED电平 //main.c #include "Led_Key.h" //见上篇 #include "bsp_exti.h" #include "stm32f10x_gpio.h" int main(void) { Led_Configuration(); Key_Configuration(); PA0_EXTI0_Configuration(); while(1) { } }
...Thank you for reading...______________________Heisenberg_Poppings