请问HAL库中的延时函数是怎么算的

2019-07-14 16:02发布

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10条回答

7762642422d

1楼-- · 2019-07-14 20:28

精彩回答 2 元偷偷看……

gaozhu123

2楼-- · 2019-07-14 21:19

vywyefswer

3楼-- · 2019-07-15 02:28

看代码就晓得了，systick是1ms的Stm32xx_hal.c中HAL_InitTick中有写的

Oo一笑

4楼-- · 2019-07-15 04:19

__weak HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)

{
  /*Configure the SysTick to have interrupt in 1ms time basis*/
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

  /*Configure the SysTick IRQ priority */
  HAL_NVIC_SetPriority(SysTick_IRQn, TickPriority ,0);

/* Return function status */
  return HAL_OK;
}
static __IO uint32_t uwTick;
__weak void HAL_IncTick(void)
{
  uwTick++;
}

__weak uint32_t HAL_GetTick(void)
{
  return uwTick;
}

__weak void HAL_Delay(__IO uint32_t Delay)
{
  uint32_t tickstart = HAL_GetTick();
  while((HAL_GetTick() - tickstart) < Delay)
  {
  }
}