中断优先级设置问题

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楼主 | 2020-4-26 12:02 | 只看该作者回帖奖励

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中断优先级, ic, vi, ni, ST

static void NVIC_Config(void)
{
      NVIC_InitTypeDef NVIC_InitStruct;

      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannel = EXTI1_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init( &NVIC_InitStruct );

      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
      NVIC_InitStruct.NVIC_IRQChannel = EXTI3_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init( &NVIC_InitStruct );
}

谁能给我通俗的讲一下NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority，NVIC_InitStruct.NVIC_IRQChannelSubPriority，
是什么意思，到底怎样设置中断优先级，还有中断优先组NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); 组1是比组2先执行吗？

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