1、配置RCC时钟,打开对应的端口的时钟
//开启RCC时钟,配置GPIO和AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
2、配置GPIO(X),选择对应端口开启输入模式
//配置GPIO
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
3、配置AFIO,选择GPIO连接到EXIT
//配置AFIO,选择中断引脚
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14);
4、配置EXTI,选择触发方式(上升沿、下降沿、双边沿)(选择触发方式:中断响应、事件响应)
//配置EXTI,配置任意线路的模式(中断模式或事件模式),并选择触发方式(上升沿[Rising]、下降沿[Falling]、双边沿[Rising_Falling])、开启(关闭)中断
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line14;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
5、配置NVIC,为中断配置优先级
//设置优先级分组:先占优先级和从优先级(这个模式范围需要在整个系统内统一)
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//配置NVIC,配置中断通道(对应EXTI的线路),指定中断通道状态(使能/失能),最后分别配置线路的抢占优先级和响应优先级
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_InitStructure);
中断程序总代码
#include "stm32f10x.h" // Device header
//定义中断的函数
void CountSensor_Init(void)
{
//开启RCC时钟,配置GPIO和AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//配置GPIO
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//配置AFIO,选择中断引脚
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14);
//配置EXTI,配置任意线路的模式(中断模式或事件模式),并选择触发方式(上升沿[Rising]、下降沿[Falling]、双边沿[Rising_Falling])、开启(关闭)中断
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line14;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_Init(&EXTI_InitStructure);
//设置优先级分组:先占优先级和从优先级(这个模式范围需要在整个系统内统一)
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//配置NVIC,配置中断通道(对应EXTI的线路),指定中断通道状态(使能/失能),最后分别配置线路的抢占优先级和响应优先级
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_InitStructure);
}
//开启中断的函数(函数为固定值,查表验证);不需要在.h文件额外声明,会自动执行的啦
//这里开启的是EXTI 10~15 的线路,不确定所以还要开启线路判断
void EXTI15_10_IRQHandler(void)
{
//检查指定的 EXTI (14)线路触发请求发生与否
if (EXTI_GetITStatus(EXTI_Line14) == SET)
{
//中断程序结束后,要清楚中断请求,结束中断
EXTI_ClearITPendingBit(EXTI_Line14);
}
}
EXTI中断
EXIT框图
参考资料:【STM32入门教程-2023持续更新中】 https://www.bilibili.com/video/BV1th411z7sn/?p=12&share_source=copy_web&vd_source=75df8cb68ad3ea976a2f5faa2e9336aa
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