Does HAL_GetTick() return ticks or milliseconds? (and how to measure in microseconds)

Question

I\'m new to using HAL functions. The description of the function HAL_GetTick() says that it \"provides a tick value in millisecond

Answer 1

Although the question was already answered, I think it would be helpful to see how HAL uses HAL_GetTick() to count milliseconds. This can be seen in HAL's function HAL_Delay(uint32_t Delay).

Implementation of HAL_Delay(uint32_t Delay) from stm32l0xx_hal.c:

/**
  * @brief This function provides minimum delay (in milliseconds) based
  *        on variable incremented.
  * @note In the default implementation , SysTick timer is the source of time base.
  *       It is used to generate interrupts at regular time intervals where uwTick
  *       is incremented.
  * @note This function is declared as __weak to be overwritten in case of other
  *       implementations in user file.
  * @param Delay specifies the delay time length, in milliseconds.
  * @retval None
  */
__weak void HAL_Delay(uint32_t Delay)
{
  uint32_t tickstart = HAL_GetTick();
  uint32_t wait = Delay;

  /* Add a period to guaranty minimum wait */
  if (wait < HAL_MAX_DELAY)
  {
    wait++;
  }

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