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/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************

* File Name          : stm32f10x_wwdg.c

* Author             : MCD Application Team

* Date First Issued  : 09/29/2006

* Description        : This file provides all the WWDG firmware functions.

********************************************************************************

* History:

* 04/02/2007: V0.2

* 02/05/2007: V0.1

* 09/29/2006: V0.01

********************************************************************************

* THE PRESENT SOFTWARE 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 SOFTWARE 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))

/* Alias word address of EWIF bit */

#define SR_OFFSET         (WWDG_OFFSET + 0x08)

#define EWIF_BitNumber    0x00

#define SR_EWIF_BB        (PERIPH_BB_BASE + (SR_OFFSET * 32) + (EWIF_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(IS_WWDG_PRESCALER(WWDG_Prescaler));

  /* Clear WDGTB[8:7] bits */

  tmpreg = WWDG->CFR & CFR_WDGTB_Mask;

  /* Set WDGTB[8:7] 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(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(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(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)(*(vu32 *) SR_EWIF_BB);

}

/*******************************************************************************

* 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 2007 STMicroelectronics *****END OF FILE****/