stm8s_wwdg.c

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/**
  ********************************************************************************
  * @file    stm8s_wwdg.c
  * @author  MCD Application Team
  * @version V2.3.0
  * @date    16-June-2017
  * @brief   This file contains all the functions for the WWDG peripheral.
   ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8s_wwdg.h"

/** @addtogroup STM8S_StdPeriph_Driver
  * @{
  */
/* Private define ------------------------------------------------------------*/
#define BIT_MASK          ((uint8_t)0x7F)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @addtogroup WWDG_Public_Functions
  * @{
  */

/**
  * @brief  Initializes the WWDG peripheral.
  *         This function set Window Register = WindowValue, Counter Register
  *         according to Counter and \b ENABLE \b WWDG
  * @param  Counter : WWDG counter value
  * @param  WindowValue : specifies the WWDG Window Register, range is 0x00 to 0x7F.
  * @retval None
  */
void WWDG_Init(uint8_t Counter, uint8_t WindowValue)
{
  /* Check the parameters */
  assert_param(IS_WWDG_WINDOWLIMITVALUE_OK(WindowValue));
  
  WWDG->WR = WWDG_WR_RESET_VALUE;
  WWDG->CR = (uint8_t)((uint8_t)(WWDG_CR_WDGA | WWDG_CR_T6) | (uint8_t)Counter);
  WWDG->WR = (uint8_t)((uint8_t)(~WWDG_CR_WDGA) & (uint8_t)(WWDG_CR_T6 | WindowValue));
}

/**
  * @brief  Refreshes the WWDG peripheral.
  * @param  Counter :  WWDG Counter Value
  *         This parameter must be a number between 0x40 and 0x7F.
  * @retval None
  */
void WWDG_SetCounter(uint8_t Counter)
{
  /* Check the parameters */
  assert_param(IS_WWDG_COUNTERVALUE_OK(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 = (uint8_t)(Counter & (uint8_t)BIT_MASK);
}

/**
  * @brief Gets the WWDG Counter Value.
  *        This value could be used to check if WWDG is in the window, where
  *        refresh is allowed.
  * @param  None
  * @retval WWDG Counter Value
  */
uint8_t WWDG_GetCounter(void)
{
  return(WWDG->CR);
}

/**
  * @brief  Generates immediate WWDG RESET.
  * @param  None
  * @retval None
  */
void WWDG_SWReset(void)
{
  WWDG->CR = WWDG_CR_WDGA; /* Activate WWDG, with clearing T6 */
}

/**
  * @brief  Sets the WWDG window value.
  * @param  WindowValue: specifies the window value to be compared to the
  *         downcounter.
  *         This parameter value must be lower than 0x80.
  * @retval None
  */
void WWDG_SetWindowValue(uint8_t WindowValue)
{
  /* Check the parameters */
  assert_param(IS_WWDG_WINDOWLIMITVALUE_OK(WindowValue));
  
  WWDG->WR = (uint8_t)((uint8_t)(~WWDG_CR_WDGA) & (uint8_t)(WWDG_CR_T6 | WindowValue));
}

/**
  * @}
  */
  
/**
  * @}
  */
  

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/