/**
  * @brief  Handles RNG interrupt request.
  * @note   In the case of a clock error, the RNG is no more able to generate 
  *         random numbers because the PLL48CLK clock is not correct. User has 
  *         to check that the clock controller is correctly configured to provide
  *         the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT(). 
  *         The clock error has no impact on the previously generated 
  *         random numbers, and the RNG_DR register contents can be used.
  * @note   In the case of a seed error, the generation of random numbers is 
  *         interrupted as long as the SECS bit is '1'. If a number is 
  *         available in the RNG_DR register, it must not be used because it may 
  *         not have enough entropy. In this case, it is recommended to clear the 
  *         SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable 
  *         the RNG peripheral to reinitialize and restart the RNG.
  * @note   User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
  *         or CEIS are set.  
  * @param  hrng: pointer to a RNG_HandleTypeDef structure that contains
  *                the configuration information for RNG.
  * @retval None

  */
void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
{
  /* RNG clock error interrupt occurred */
  if((__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET) ||  (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET))
  { 
    /* Change RNG peripheral state */
    hrng->State = HAL_RNG_STATE_ERROR;
  
    HAL_RNG_ErrorCallback(hrng);
    
    /* Clear the clock error flag */
    __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI|RNG_IT_SEI);
    
  }
  
  /* Check RNG data ready interrupt occurred */    
  if(__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
  {
    /* Generate random number once, so disable the IT */
    __HAL_RNG_DISABLE_IT(hrng);
    
    /* Get the 32bit Random number (DRDY flag automatically cleared) */ 
    hrng->RandomNumber = hrng->Instance->DR;
    
    if(hrng->State != HAL_RNG_STATE_ERROR)
    {
      /* Change RNG peripheral state */
      hrng->State = HAL_RNG_STATE_READY; 
      
      /* Data Ready callback */ 
      HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
    } 
  }
} 
Example #2
0
/**
  * @brief  Handles RNG interrupt request.
  * @note   In the case of a clock error, the RNG is no more able to generate
  *         random numbers because the PLL48CLK clock is not correct. User has
  *         to check that the clock controller is correctly configured to provide
  *         the RNG clock and clear the CEIS bit using __HAL_RNG_CLEAR_IT().
  *         The clock error has no impact on the previously generated
  *         random numbers, and the RNG_DR register contents can be used.
  * @note   In the case of a seed error, the generation of random numbers is
  *         interrupted as long as the SECS bit is '1'. If a number is
  *         available in the RNG_DR register, it must not be used because it may
  *         not have enough entropy. In this case, it is recommended to clear the
  *         SEIS bit using __HAL_RNG_CLEAR_IT(), then disable and enable
  *         the RNG peripheral to reinitialize and restart the RNG.
  * @note   User-written HAL_RNG_ErrorCallback() API is called once whether SEIS
  *         or CEIS are set.
  * @param  hrng pointer to a RNG_HandleTypeDef structure that contains
  *                the configuration information for RNG.
  * @retval None

  */
void HAL_RNG_IRQHandler(RNG_HandleTypeDef *hrng)
{
  uint32_t rngclockerror = 0U;

  /* RNG clock error interrupt occurred */
  if (__HAL_RNG_GET_IT(hrng, RNG_IT_CEI) != RESET)
  {
    rngclockerror = 1U;
  }
  else if (__HAL_RNG_GET_IT(hrng, RNG_IT_SEI) != RESET)
  {
    rngclockerror = 1U;
  }
  else
  {
    /* Nothing to do */
  }

  if (rngclockerror == 1U)
  {
    /* Change RNG peripheral state */
    hrng->State = HAL_RNG_STATE_ERROR;

#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
    /* Call registered Error callback */
    hrng->ErrorCallback(hrng);
#else
    /* Call legacy weak Error callback */
    HAL_RNG_ErrorCallback(hrng);
#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */

    /* Clear the clock error flag */
    __HAL_RNG_CLEAR_IT(hrng, RNG_IT_CEI | RNG_IT_SEI);
  }

  /* Check RNG data ready interrupt occurred */
  if (__HAL_RNG_GET_IT(hrng, RNG_IT_DRDY) != RESET)
  {
    /* Generate random number once, so disable the IT */
    __HAL_RNG_DISABLE_IT(hrng);

    /* Get the 32bit Random number (DRDY flag automatically cleared) */
    hrng->RandomNumber = hrng->Instance->DR;

    if (hrng->State != HAL_RNG_STATE_ERROR)
    {
      /* Change RNG peripheral state */
      hrng->State = HAL_RNG_STATE_READY;
      /* Process Unlocked */
      __HAL_UNLOCK(hrng);

#if (USE_HAL_RNG_REGISTER_CALLBACKS == 1)
      /* Call registered Data Ready callback */
      hrng->ReadyDataCallback(hrng, hrng->RandomNumber);
#else
      /* Call legacy weak Data Ready callback */
      HAL_RNG_ReadyDataCallback(hrng, hrng->RandomNumber);
#endif /* USE_HAL_RNG_REGISTER_CALLBACKS */
    }
  }
}