STM32

【中断优先级】STM32中断优先级没用，请问是怎么回事？？？

2019-07-14 23:01发布

站内问答 / STM32/STM8
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  1. void NVIC_Configuration(void)
  2. {
  3.     NVIC_InitTypeDef NVIC_InitStructure;

  5.     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//设置优先级分组形式1，即抢占级占一位，优先级占3位

  7.     /* Enable the USART1 Interrupt */
  8.     NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
  9.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  10.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  11.     NVIC_Init(&NVIC_InitStructure);


  14.     /* Enable the USART2 Interrupt*/
  15.     NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQChannel;
  16.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
  17.     NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
  18.     NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  19.     NVIC_Init(&NVIC_InitStructure);

  21.     /* Enable the USART3 Interrupt*/
  22.     NVIC_InitStructure.NVIC_IRQChannel=USART3_IRQChannel;
  23.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
  24.     NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
  25.     NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  26.     NVIC_Init(&NVIC_InitStructure);


  29.     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 /*| RCC_APB1Periph_TIM3*/,ENABLE);
  30.     NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
  31.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
  32.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  33.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  34.     NVIC_Init(&NVIC_InitStructure);
  35. }
复制代码
如上就是我NIVC的配置，我的定时中断执行时间比较长，我希望在我定时中断的时候，我的串口中断不影响，照常执行，也就是优先级高点。但是我这么做，运行的效果是我的串口接收不能打断定时，只有定时过了之后，才能继续接收。

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2条回答
初代饭影
2019-07-15 14:34
你是用USATR1来接收的吗，你看看你的配置

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