本帖最后由 175192387 于 2019-4-4 21:48 编辑
过零检测电路,设置了过零中断，我发现程序一直未进入中断。
过零检测电路
这是示波器的图
- void EXTIX_Init(void)
- {
-
- EXTI_InitTypeDef EXTI_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- KEY_Init(); // 按键端口初始化
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟
- //GPIOB.14 中断线以及中断初始化配置
- GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource14);
- EXTI_InitStructure.EXTI_Line=EXTI_Line14;
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;
- EXTI_Init(&EXTI_InitStructure); //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器
-
- NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级2，
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
- NVIC_Init(&NVIC_InitStructure);
- }
- //外部中断0服务程序
- void EXTI15_10_IRQHandler(void)
- {
- if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)==1)
- {
- UPWM=1;
- EXTI_ClearITPendingBit(EXTI_Line14);
- }
- if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)==0)
- {
- num=0;
- TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //开启定时器中断
- EXTI_ClearITPendingBit(EXTI_Line14);
- }
- }
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