关于hal库 延时函数HAL_Delay()

__weak void HAL_Delay(uint32_t Delay)
{
  uint32_t tickstart = HAL_GetTick();
  uint32_t wait = Delay;

  /* Add a freq to guarantee minimum wait */
  if (wait < HAL_MAX_DELAY)
  {
    wait += (uint32_t)(uwTickFreq)；          　　　　//理解在最下方向
  }

  while((HAL_GetTick() - tickstart) < wait)
  {
  }
}

HAL_TickFreqTypeDef uwTickFreq = HAL_TICK_FREQ_DEFAULT;  /* 1KHz */

typedef enum
{
  HAL_TICK_FREQ_10HZ         = 100U,
  HAL_TICK_FREQ_100HZ        = 10U,
  HAL_TICK_FREQ_1KHZ         = 1U,
  HAL_TICK_FREQ_DEFAULT      = HAL_TICK_FREQ_1KHZ
} HAL_TickFreqTypeDef;