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125 lines
3.9 KiB
125 lines
3.9 KiB
/**
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********************************************************************************
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* @file stm8s_wwdg.c
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* @author MCD Application Team
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* @version V2.2.0
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* @date 30-September-2014
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* @brief This file contains all the functions for the WWDG peripheral.
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
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*
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* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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* You may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.st.com/software_license_agreement_liberty_v2
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm8s_wwdg.h"
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/** @addtogroup STM8S_StdPeriph_Driver
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* @{
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*/
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/* Private define ------------------------------------------------------------*/
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#define BIT_MASK ((uint8_t)0x7F)
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @addtogroup WWDG_Public_Functions
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* @{
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*/
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/**
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* @brief Initializes the WWDG peripheral.
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* This function set Window Register = WindowValue, Counter Register
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* according to Counter and \b ENABLE \b WWDG
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* @param Counter : WWDG counter value
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* @param WindowValue : specifies the WWDG Window Register, range is 0x00 to 0x7F.
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* @retval None
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*/
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void WWDG_Init(uint8_t Counter, uint8_t WindowValue)
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{
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/* Check the parameters */
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assert_param(IS_WWDG_WINDOWLIMITVALUE_OK(WindowValue));
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WWDG->WR = WWDG_WR_RESET_VALUE;
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WWDG->CR = (uint8_t)((uint8_t)(WWDG_CR_WDGA | WWDG_CR_T6) | (uint8_t)Counter);
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WWDG->WR = (uint8_t)((uint8_t)(~WWDG_CR_WDGA) & (uint8_t)(WWDG_CR_T6 | WindowValue));
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}
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/**
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* @brief Refreshes the WWDG peripheral.
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* @param Counter : WWDG Counter Value
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* This parameter must be a number between 0x40 and 0x7F.
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* @retval None
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*/
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void WWDG_SetCounter(uint8_t Counter)
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{
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/* Check the parameters */
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assert_param(IS_WWDG_COUNTERVALUE_OK(Counter));
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/* Write to T[6:0] bits to configure the counter value, no need to do
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a read-modify-write; writing a 0 to WDGA bit does nothing */
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WWDG->CR = (uint8_t)(Counter & (uint8_t)BIT_MASK);
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}
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/**
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* @brief Gets the WWDG Counter Value.
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* This value could be used to check if WWDG is in the window, where
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* refresh is allowed.
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* @param None
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* @retval WWDG Counter Value
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*/
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uint8_t WWDG_GetCounter(void)
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{
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return(WWDG->CR);
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}
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/**
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* @brief Generates immediate WWDG RESET.
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* @param None
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* @retval None
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*/
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void WWDG_SWReset(void)
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{
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WWDG->CR = WWDG_CR_WDGA; /* Activate WWDG, with clearing T6 */
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}
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/**
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* @brief Sets the WWDG window value.
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* @param WindowValue: specifies the window value to be compared to the
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* downcounter.
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* This parameter value must be lower than 0x80.
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* @retval None
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*/
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void WWDG_SetWindowValue(uint8_t WindowValue)
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{
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/* Check the parameters */
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assert_param(IS_WWDG_WINDOWLIMITVALUE_OK(WindowValue));
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WWDG->WR = (uint8_t)((uint8_t)(~WWDG_CR_WDGA) & (uint8_t)(WWDG_CR_T6 | WindowValue));
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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