关于嘀嗒定时器的中断优先级的问题

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楼主

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楼主 | 2018-7-1 17:24 | 只看该作者回帖奖励

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中断优先级, 定时器, ic, TI, ck

static __INLINE uint32_t SysTick_Config(uint32_t ticks)
{
  if (ticks > SysTick_LOAD_RELOAD_Msk)  return (1);          /* Reload value impossible */

  SysTick->LOAD  = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;    /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority for Cortex-M0 System Interrupts */
  SysTick->VAL = 0;                                        /* 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 (0);                                                 /* Function successful */
}

我就是不知道这个NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority for Cortex-M0 System Interrupts */
到底配置的抢占优先级和响应优先级分别是多少？？求解释

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