中断优先级的定义

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楼主 | 2020-4-26 10:52 | 只看该作者回帖奖励

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中断优先级, ic, vi, IO, rio

这个是自带的中断优先级
static __INLINE void NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
  if(IRQn < 0) {
SCB->SHP[((uint32_t)(IRQn) & 0xF)-4] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff); } /* set Priority for Cortex-M3 System Interrupts */
  else {
NVIC->IP[(uint32_t)(IRQn)] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff); }       /* set Priority for device specific Interrupts  */
}

这个是看视频编写的中断优先级
static  void EXTI_NVIC_Config(void)
{
      NVIC_InitTypeDef  NVIC_InitStruct;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStruct.NVIC_IRQChannel=EXTI0_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
      NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init( &NVIC_InitStruct);
}

请问它们之间有什么区别或者联系吗？自带的不是很看得懂

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