请问我的NVIC设置有什么问题？？

只看该作者 · 2008-3-28 14:49

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);

/* Enable the TIM2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the TIM3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the EXTI9_5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the ADC1  Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;    NVIC_Init(&NVIC_InitStructure);

刚开始对STM32学习使用，碰到一个问题：我在初始化时将以上各个中断都Enable了，为什么一直进入USART1中断，其他中断都进不了。而如果把USART1中断Disable了。其他中断都正常进入？

1万 · 2008-3-28 15:41

如果不清除相应的中断状态位，则该中断会永远有效。

这个原则对所有的中断源都适用。

只看该作者 · 2008-3-29 10:26

我在USART中断处理函数中都清除相应的中断标志位
USART_ClearFlag(USART1, USART_FLAG_RXNE);
USART_ClearFlag(USART1, USART_FLAG_TXE);
再者，TIM2_IRQChannel的中断优先级高于USART ,应该在TIM2中断产生时切到TIM2中断处理函数才对吧！但是却还是一直进入USART中断函数