/**
* @brief Initialize the IWDG according to the specified parameters in the
* IWDG_InitTypeDef and start watchdog. Before exiting function,
* watchdog is refreshed in order to have correct time base.
* @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
* the configuration information for the specified IWDG module.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
{
uint32_t tickstart;
/* Check the IWDG handle allocation */
if(hiwdg == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
assert_param(IS_IWDG_WINDOW(hiwdg->Init.Window));
/* Enable IWDG. LSI is turned on automaticaly */
__HAL_IWDG_START(hiwdg);
/* Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers by writing
0x5555 in KR */
IWDG_ENABLE_WRITE_ACCESS(hiwdg);
/* Write to IWDG registers the Prescaler & Reload values to work with */
hiwdg->Instance->PR = hiwdg->Init.Prescaler;
hiwdg->Instance->RLR = hiwdg->Init.Reload;
/* Check pending flag, if previous update not done, return timeout */
tickstart = HAL_GetTick();
/* Wait for register to be updated */
while(hiwdg->Instance->SR != RESET)
{
if((HAL_GetTick() - tickstart ) > HAL_IWDG_DEFAULT_TIMEOUT)
{
return HAL_TIMEOUT;
}
}
/* If window parameter is different than current value, modify window
register */
if(hiwdg->Instance->WINR != hiwdg->Init.Window)
{
/* Write to IWDG WINR the IWDG_Window value to compare with. In any case,
even if window feature is disabled, Watchdog will be reloaded by writing
windows register */
hiwdg->Instance->WINR = hiwdg->Init.Window;
}
else
{
/* Reload IWDG counter with value defined in the reload register */
__HAL_IWDG_RELOAD_COUNTER(hiwdg);
}
/* Return function status */
return HAL_OK;
}
/**
* @brief Initialize the IWDG according to the specified
* parameters in the IWDG_InitTypeDef and initialize the associated handle.
* @param hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
* the configuration information for the specified IWDG module.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
{
uint32_t tickstart = 0;
/* Check the IWDG handle allocation */
if(hiwdg == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
assert_param(IS_IWDG_WINDOW(hiwdg->Init.Window));
/* Check pending flag, if previous update not done, return error */
if(((hiwdg->Instance->SR) & IWDG_SR_FLAGS) != 0)
{
return HAL_ERROR;
}
if(hiwdg->State == HAL_IWDG_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hiwdg->Lock = HAL_UNLOCKED;
/* Init the low level hardware */
HAL_IWDG_MspInit(hiwdg);
}
/* Change IWDG peripheral state */
hiwdg->State = HAL_IWDG_STATE_BUSY;
/* Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers */
/* by writing 0x5555 in KR */
IWDG_ENABLE_WRITE_ACCESS(hiwdg);
/* Write to IWDG registers the IWDG_Prescaler & IWDG_Reload values to work with */
MODIFY_REG(hiwdg->Instance->PR, IWDG_PR_PR, hiwdg->Init.Prescaler);
MODIFY_REG(hiwdg->Instance->RLR, IWDG_RLR_RL, hiwdg->Init.Reload);
/* check if window option is enabled */
if (((hiwdg->Init.Window) != IWDG_WINDOW_DISABLE) || ((hiwdg->Instance->WINR) != IWDG_WINDOW_DISABLE))
{
tickstart = HAL_GetTick();
/* Wait for register to be updated */
while(((hiwdg->Instance->SR) & IWDG_SR_FLAGS) != 0)
{
if((HAL_GetTick() - tickstart ) > HAL_IWDG_DEFAULT_TIMEOUT)
{
/* Set IWDG state */
hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
return HAL_TIMEOUT;
}
}
/* Write to IWDG WINR the IWDG_Window value to compare with */
MODIFY_REG(hiwdg->Instance->WINR, IWDG_WINR_WIN, hiwdg->Init.Window);
}
/* Change IWDG peripheral state */
hiwdg->State = HAL_IWDG_STATE_READY;
/* Return function status */
return HAL_OK;
}