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目录NVIC向量中断控制器
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
EXTI外部中断／事件控制器
//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
外部中断服务函数：
| 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 |
- 中断线 0-4 每个中断线对应一个中断函数，中断线 5-9 共用中断函数 EXTI9_5_IRQHandler，中断线 10-15 共用中断函数 EXTI15_10_IRQHandler
代码示例
//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