- /******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
- * File Name : stm32f10x_wwdg.c
- * Author : MCD Application Team
- * Version : V2.0.2
- * Date : 07/11/2008
- * Description : This file provides all the WWDG firmware functions.
- ********************************************************************************
- * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
- * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
- * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
- * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
- * CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
- * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
- *******************************************************************************/
- /* Includes ------------------------------------------------------------------*/
- #include "stm32f10x_wwdg.h"
- #include "stm32f10x_rcc.h"
- /* Private typedef -----------------------------------------------------------*/
- /* Private define ------------------------------------------------------------*/
- /* ----------- WWDG registers bit address in the alias region ----------- */
- #define WWDG_OFFSET (WWDG_BASE - PERIPH_BASE)
- /* Alias word address of EWI bit */
- #define CFR_OFFSET (WWDG_OFFSET + 0x04)
- #define EWI_BitNumber 0x09
- #define CFR_EWI_BB (PERIPH_BB_BASE + (CFR_OFFSET * 32) + (EWI_BitNumber * 4))
- /* --------------------- WWDG registers bit mask ------------------------ */
- /* CR register bit mask */
- #define CR_WDGA_Set ((u32)0x00000080)
- /* CFR register bit mask */
- #define CFR_WDGTB_Mask ((u32)0xFFFFFE7F)
- #define CFR_W_Mask ((u32)0xFFFFFF80)
- #define BIT_Mask ((u8)0x7F)
- /* Private macro -------------------------------------------------------------*/
- /* Private variables ---------------------------------------------------------*/
- /* Private function prototypes -----------------------------------------------*/
- /* Private functions ---------------------------------------------------------*/
- /*******************************************************************************
- * Function Name : WWDG_DeInit
- * Description : Deinitializes the WWDG peripheral registers to their default
- * reset values.
- * Input : None
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_DeInit(void)
- {
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
- }
- /*******************************************************************************
- * Function Name : WWDG_SetPrescaler
- * Description : Sets the WWDG Prescaler.
- * Input : - WWDG_Prescaler: specifies the WWDG Prescaler.
- * This parameter can be one of the following values:
- * - WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
- * - WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
- * - WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
- * - WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_SetPrescaler(u32 WWDG_Prescaler)
- {
- u32 tmpreg = 0;
- /* Check the parameters */
- assert_param(IS_WWDG_PRESCALER(WWDG_Prescaler));
- /* Clear WDGTB[1:0] bits */
- tmpreg = WWDG->CFR & CFR_WDGTB_Mask;
- /* Set WDGTB[1:0] bits according to WWDG_Prescaler value */
- tmpreg |= WWDG_Prescaler;
- /* Store the new value */
- WWDG->CFR = tmpreg;
- }
- /*******************************************************************************
- * Function Name : WWDG_SetWindowValue
- * Description : Sets the WWDG window value.
- * Input : - WindowValue: specifies the window value to be compared to
- * the downcounter.
- * This parameter value must be lower than 0x80.
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_SetWindowValue(u8 WindowValue)
- {
- u32 tmpreg = 0;
- /* Check the parameters */
- assert_param(IS_WWDG_WINDOW_VALUE(WindowValue));
- /* Clear W[6:0] bits */
- tmpreg = WWDG->CFR & CFR_W_Mask;
- /* Set W[6:0] bits according to WindowValue value */
- tmpreg |= WindowValue & BIT_Mask;
- /* Store the new value */
- WWDG->CFR = tmpreg;
- }
- /*******************************************************************************
- * Function Name : WWDG_EnableIT
- * Description : Enables the WWDG Early Wakeup interrupt(EWI).
- * Input : None
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_EnableIT(void)
- {
- *(vu32 *) CFR_EWI_BB = (u32)ENABLE;
- }
- /*******************************************************************************
- * Function Name : WWDG_SetCounter
- * Description : Sets the WWDG counter value.
- * Input : - Counter: specifies the watchdog counter value.
- * This parameter must be a number between 0x40 and 0x7F.
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_SetCounter(u8 Counter)
- {
- /* Check the parameters */
- assert_param(IS_WWDG_COUNTER(Counter));
- /* Write to T[6:0] bits to configure the counter value, no need to do
- a read-modify-write; writing a 0 to WDGA bit does nothing */
- WWDG->CR = Counter & BIT_Mask;
- }
- /*******************************************************************************
- * Function Name : WWDG_Enable
- * Description : Enables WWDG and load the counter value.
- * - Counter: specifies the watchdog counter value.
- * This parameter must be a number between 0x40 and 0x7F.
- * Input : None
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_Enable(u8 Counter)
- {
- /* Check the parameters */
- assert_param(IS_WWDG_COUNTER(Counter));
- WWDG->CR = CR_WDGA_Set | Counter;
- }
- /*******************************************************************************
- * Function Name : WWDG_GetFlagStatus
- * Description : Checks whether the Early Wakeup interrupt flag is set or not.
- * Input : None
- * Output : None
- * Return : The new state of the Early Wakeup interrupt flag (SET or RESET)
- *******************************************************************************/
- FlagStatus WWDG_GetFlagStatus(void)
- {
- return (FlagStatus)(WWDG->SR);
- }
- /*******************************************************************************
- * Function Name : WWDG_ClearFlag
- * Description : Clears Early Wakeup interrupt flag.
- * Input : None
- * Output : None
- * Return : None
- *******************************************************************************/
- void WWDG_ClearFlag(void)
- {
- WWDG->SR = (u32)RESET;
- }
- /******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/