中断优先级 HAL_NVIC_SetPriority()中的抢占和响应优先级参数问题

霁散A · 发表于 2020-11-24 11:06:00

各位大佬，HAL库中中断优先级配置函数中的第二个参数，第三个参数，也就是响应优先级和抢占优先级，函数中有对其有效性判断的代码，((PRIORITY) < 0x10)，如果中断优先级分组为2，即响应和抢占都为2位，按原子哥视频中说的这两个参数取值可以是0-3，而有效性判断时要求((PRIORITY) < 0x10)，0X10为2，这里没理解。难道这里不是有效性判断？
void HAL_NVIC_SetPriority(IRQn_Type IRQn, uint32_t PreemptPriority, uint32_t SubPriority){
  uint32_t prioritygroup = 0x00;

  /* Check the parameters */
  assert_param(IS_NVIC_SUB_PRIORITY(SubPriority));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(PreemptPriority));

  prioritygroup = NVIC_GetPriorityGrouping();

  NVIC_SetPriority(IRQn, NVIC_EncodePriority(prioritygroup, PreemptPriority, SubPriority));
}

#define IS_NVIC_PREEMPTION_PRIORITY(PRIORITY)  ((PRIORITY) < 0x10)
#define IS_NVIC_SUB_PRIORITY(PRIORITY)       ((PRIORITY) < 0x10)