在一个项目中，5个IO口使用了外部中断功能（220V经过光耦隔离，IO对电源进行过零检测），在测试程序时，互相有干扰，不知道有没有人遇到类似的情况？

hkys_lxh

IO配置如下,IO口时钟已开启

void PassZero_Config(void)

{

    GPIO_InitTypeDef    GPIO_InitStructure;

    NVIC_InitTypeDef    NVIC_InitStructure;

    EXTI_InitTypeDef    EXTI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    EXTI_DeInit();

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;  // PC.1 过零检测

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 外部中断

    EXTI_ClearITPendingBit(EXTI_Line1);

    EXTI_InitStructure.EXTI_Line = EXTI_Line1;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource1);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    /********************************************************/

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;  // PC.2 过零检测

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 外部中断

    EXTI_ClearITPendingBit(EXTI_Line2);

    EXTI_InitStructure.EXTI_Line = EXTI_Line2;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    /********************************************************/

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    GPIOC->BSRR = GPIO_Pin_3;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;  // PC.3 过零检测

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 外部中断

    EXTI_ClearITPendingBit(EXTI_Line3);

    EXTI_InitStructure.EXTI_Line = EXTI_Line3;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource3);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

    /********************************************************/

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;  // PC.4 过零检测

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 外部中断

    EXTI_ClearITPendingBit(EXTI_Line4);

    EXTI_InitStructure.EXTI_Line = EXTI_Line4;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource4);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

        /********************************************************/

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;  // PC.5 过零检测

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 外部中断

    EXTI_ClearITPendingBit(EXTI_Line5);

    EXTI_InitStructure.EXTI_Line = EXTI_Line5;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource5);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

}

hkys_lxh

来自硬件（继电器干扰），软件上先简单处理一下延时滤波，暂时解决，不知道干扰强了行不行

正点原子

回复【2楼】hkys_lxh:
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PCB布板设计做好点！！

xujiangyu0619

PCB布局很重要！呵呵～～～

hkys_lxh

是的！暂时先这样,实在不行，就不用中断去检测了，直接用IO去检测高低电平，毕毫秒级别的干扰脉冲少的。