AnsweredAssumed Answered

中断优先级

Question asked by 孙雪孙 on May 19, 2019
Latest reply on May 28, 2019 by Kerry Zhou

Like • Show 0 Likes0
Comment • 3

中断优先级设置例程

No one else has this question

Outcomes

3 Replies

Kerry Zhou

May 20, 2019 3:18 AM

楼主你好！

请使用这个函数去设置中断优先级：

__STATIC_INLINE void __NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
  if ((int32_t)(IRQn) >= 0)
  {
    NVIC->IP[_IP_IDX(IRQn)]  = ((uint32_t)(NVIC->IP[_IP_IDX(IRQn)]  & ~(0xFFUL << _BIT_SHIFT(IRQn))) |
       (((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL) << _BIT_SHIFT(IRQn)));
  }
  else
  {
    SCB->SHP[_SHP_IDX(IRQn)] = ((uint32_t)(SCB->SHP[_SHP_IDX(IRQn)] & ~(0xFFUL << _BIT_SHIFT(IRQn))) |
       (((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL) << _BIT_SHIFT(IRQn)));
  }
}

希望能帮到你。

关于例子，给你一个systick的中断优先级配置的代码：

__STATIC_INLINE uint32_t SysTick_Config(uint32_t ticks)
{
  if ((ticks - 1UL) > SysTick_LOAD_RELOAD_Msk)
  {
    return (1UL);                                                   /* Reload value impossible */
  }

  SysTick->LOAD  = (uint32_t)(ticks - 1UL);                         /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL); /* set Priority for Systick Interrupt */
  SysTick->VAL   = 0UL;                                             /* Load the SysTick Counter Value */
  SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |
                   SysTick_CTRL_TICKINT_Msk   |
                   SysTick_CTRL_ENABLE_Msk;                         /* Enable SysTick IRQ and SysTick Timer */
  return (0UL);                                                     /* Function successful */
}

如果还有问题，欢迎继续交流。

Wish it helps you!

If you still have question about it, please kindly let me know.

Have a great day,
Kerry

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

1 person found this helpful

Actions

孙雪孙 @ Kerry Zhou on May 28, 2019 6:45 PM
Mark Correct
Correct Answer
好的，谢谢
Like • Show 0 Likes0
Actions
- Kerry Zhou @ 孙雪孙 on May 28, 2019 8:14 PM
  Mark Correct
  Correct Answer
  不客气！
  如果还有关于这个主题的问题，欢迎继续交流。
  如果问题解决了还请帮我标下正确答案，以示结贴，谢谢。
  
  Have a great day,
  Kerry
  
  -------------------------------------------------------------------------------
  Note:
  - If this post answers your question, please click the "Mark Correct" button. Thank you!
  
  - We are following threads for 7 weeks after the last post, later replies are ignored
  Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
  -------------------------------------------------------------------------------
  Like • Show 0 Likes0
  Actions

中断优先级

Outcomes

Related Content

Recommended Content