JTAG关闭后，IO口配置成外部中断触发仍然无法正常使用

feat0506 · 发表于 2020-1-7 20:41:00

本帖最后由 feat0506 于 2020-1-10 12:18 编辑

程序如下：
      EXTI_InitTypeDef EXTI_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      GPIO_InitTypeDef GPIO_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

      GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);

      GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_3;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
      GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource3);
      EXTI_InitStructure.EXTI_Line=EXTI_Line3;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

将PB3设置成外部中断下降沿触发，关闭JTAG，在调试中发现IO口仍然无法正常使用，求问是什么原因？