03：【江科大stm32】：外部中断EXTI的使用

1、按钮通过外部中断控制LED

/*外部中断按键控制LED，使用外部中断EXTI0进行按键控制LED的亮灭
*/
#include "stm32f10x.h" 
int main(void)
{//1.对PB0引脚进行配置,按键连接的引脚RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);GPIO_InitTypeDef GPIOInitStruct;GPIOInitStruct.GPIO_Mode = GPIO_Mode_IPU;//上拉输入GPIOInitStruct.GPIO_Pin = GPIO_Pin_0;GPIO_Init(GPIOB,&GPIOInitStruct);//对PA0进行配置，LED连接的引脚RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);GPIOInitStruct.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出GPIOInitStruct.GPIO_Pin = GPIO_Pin_0;GPIOInitStruct.GPIO_Speed = GPIO_Speed_2MHz;GPIO_Init(GPIOA,&GPIOInitStruct);//2.对AFIO进行配置，AFIO的功能：①复用功能重映射，②中断引脚选择RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);//选择PB0通道进行外部中断//3.对EXTI进行配置EXTI_InitTypeDef EXTIInitStruct;EXTIInitStruct.EXTI_Line = EXTI_Line0;//选择EXTI0EXTIInitStruct.EXTI_Mode = EXTI_Mode_Interrupt;//中断模式EXTIInitStruct.EXTI_Trigger = EXTI_Trigger_Rising;//上升沿触发中断EXTIInitStruct.EXTI_LineCmd = ENABLE;//使能中断屏蔽EXTI_Init(&EXTIInitStruct);//4.对NVIC进行配置NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//优先级的分组，0抢占，4子优先NVIC_InitTypeDef NVICInitStruct;NVICInitStruct.NVIC_IRQChannel = EXTI0_IRQn;//选择中断来源NVICInitStruct.NVIC_IRQChannelPreemptionPriority = 0;//抢占为0NVICInitStruct.NVIC_IRQChannelSubPriority = 0;//子优先级为0NVICInitStruct.NVIC_IRQChannelCmd = ENABLE;//使能NVICNVIC_Init(&NVICInitStruct);while(1){}
}//中断函数
void EXTI0_IRQHandler(void)
{if(EXTI_GetFlagStatus(EXTI_Line0) == SET)//判断EXTI0中断挂起寄存器的值{EXTI_ClearITPendingBit(EXTI_Line0);//EXTI0的中断挂起寄存器置位if(GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_0) == RESET)//如果是点亮的{GPIO_WriteBit(GPIOA,GPIO_Pin_0,Bit_SET);//熄灭}else{GPIO_WriteBit(GPIOA,GPIO_Pin_0,Bit_RESET);//点亮}}
}

2、旋转编码器计次

/*通过外部中断使用旋转编码器计次
*/#include "stm32f10x.h"                 
#include "OLED.h"uint32_t count = 0;
int main(void)
{OLED_Init();OLED_Clear();//1.旋转编码器的B连接单片机的PB1，A连接单片机的PB0，对引脚的初始化RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);GPIO_InitTypeDef GPIOInitStruct;GPIOInitStruct.GPIO_Mode = GPIO_Mode_IPU;//上拉输入GPIOInitStruct.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1;GPIO_Init(GPIOB,&GPIOInitStruct);//2.对AFIO进行配置RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource0);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);//3.对EXTI进行配置EXTI_InitTypeDef EXTIInitStruct;EXTIInitStruct.EXTI_Line = EXTI_Line0 | EXTI_Line1;EXTIInitStruct.EXTI_Mode = EXTI_Mode_Interrupt;EXTIInitStruct.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿触发EXTIInitStruct.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTIInitStruct);//4.对NVIC进行配置NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);NVIC_InitTypeDef NVICInitStruct;NVICInitStruct.NVIC_IRQChannel = EXTI0_IRQn;NVICInitStruct.NVIC_IRQChannelPreemptionPriority = 0;NVICInitStruct.NVIC_IRQChannelSubPriority = 0;NVICInitStruct.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVICInitStruct);NVICInitStruct.NVIC_IRQChannel = EXTI1_IRQn;NVICInitStruct.NVIC_IRQChannelPreemptionPriority = 0;NVICInitStruct.NVIC_IRQChannelSubPriority = 0;NVICInitStruct.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVICInitStruct);while(1){OLED_ShowSignedNum(1,1,count,5);}
}//中断函数
void EXTI0_IRQHandler(void)
{if(EXTI_GetFlagStatus(EXTI_Line0) == SET){EXTI_ClearITPendingBit(EXTI_Line0);//清除中断状态if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1) == 0)count++;}
}void EXTI1_IRQHandler(void)
{if(EXTI_GetFlagStatus(EXTI_Line1) == SET){EXTI_ClearITPendingBit(EXTI_Line1);//清除中断状态if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0)count--;}
}