lib/main/STM32F1/Drivers/STM32F10x_StdPeriph_Driver/src/stm32f10x_wwdg.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f10x_wwdg.c
   4   * @author  MCD Application Team
   5   * @version V3.5.0
   6   * @date    11-March-2011
   7   * @brief   This file provides all the WWDG firmware functions.
   8   ******************************************************************************
   9   * @attention
  10   *
  11   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  12   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  13   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  14   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  15   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  16   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  17   *
  18   * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  19   ******************************************************************************
  20   */
  21
  22 /* Includes ------------------------------------------------------------------*/
  23 #include "stm32f10x_wwdg.h"
  24 #include "stm32f10x_rcc.h"
  25
  26 /** @addtogroup STM32F10x_StdPeriph_Driver
  27   * @{
  28   */
  29
  30 /** @defgroup WWDG
  31   * @brief WWDG driver modules
  32   * @{
  33   */
  34
  35 /** @defgroup WWDG_Private_TypesDefinitions
  36   * @{
  37   */
  38
  39 /**
  40   * @}
  41   */
  42
  43 /** @defgroup WWDG_Private_Defines
  44   * @{
  45   */
  46
  47 /* ----------- WWDG registers bit address in the alias region ----------- */
  48 #define WWDG_OFFSET       (WWDG_BASE - PERIPH_BASE)
  49
  50 /* Alias word address of EWI bit */
  51 #define CFR_OFFSET        (WWDG_OFFSET + 0x04)
  52 #define EWI_BitNumber     0x09
  53 #define CFR_EWI_BB        (PERIPH_BB_BASE + (CFR_OFFSET * 32) + (EWI_BitNumber * 4))
  54
  55 /* --------------------- WWDG registers bit mask ------------------------ */
  56
  57 /* CR register bit mask */
  58 #define CR_WDGA_Set       ((uint32_t)0x00000080)
  59
  60 /* CFR register bit mask */
  61 #define CFR_WDGTB_Mask    ((uint32_t)0xFFFFFE7F)
  62 #define CFR_W_Mask        ((uint32_t)0xFFFFFF80)
  63 #define BIT_Mask          ((uint8_t)0x7F)
  64
  65 /**
  66   * @}
  67   */
  68
  69 /** @defgroup WWDG_Private_Macros
  70   * @{
  71   */
  72
  73 /**
  74   * @}
  75   */
  76
  77 /** @defgroup WWDG_Private_Variables
  78   * @{
  79   */
  80
  81 /**
  82   * @}
  83   */
  84
  85 /** @defgroup WWDG_Private_FunctionPrototypes
  86   * @{
  87   */
  88
  89 /**
  90   * @}
  91   */
  92
  93 /** @defgroup WWDG_Private_Functions
  94   * @{
  95   */
  96
  97 /**
  98   * @brief  Deinitializes the WWDG peripheral registers to their default reset values.
  99   * @param  None
 100   * @retval None
 101   */
 102 void WWDG_DeInit(void)
 103 {
 104   RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
 105   RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
 106 }
 107
 108 /**
 109   * @brief  Sets the WWDG Prescaler.
 110   * @param  WWDG_Prescaler: specifies the WWDG Prescaler.
 111   *   This parameter can be one of the following values:
 112   *     @arg WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
 113   *     @arg WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
 114   *     @arg WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
 115   *     @arg WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
 116   * @retval None
 117   */
 118 void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
 119 {
 120   uint32_t tmpreg = 0;
 121   /* Check the parameters */
 122   assert_param(IS_WWDG_PRESCALER(WWDG_Prescaler));
 123   /* Clear WDGTB[1:0] bits */
 124   tmpreg = WWDG->CFR & CFR_WDGTB_Mask;
 125   /* Set WDGTB[1:0] bits according to WWDG_Prescaler value */
 126   tmpreg |= WWDG_Prescaler;
 127   /* Store the new value */
 128   WWDG->CFR = tmpreg;
 129 }
 130
 131 /**
 132   * @brief  Sets the WWDG window value.
 133   * @param  WindowValue: specifies the window value to be compared to the downcounter.
 134   *   This parameter value must be lower than 0x80.
 135   * @retval None
 136   */
 137 void WWDG_SetWindowValue(uint8_t WindowValue)
 138 {
 139   __IO uint32_t tmpreg = 0;
 140
 141   /* Check the parameters */
 142   assert_param(IS_WWDG_WINDOW_VALUE(WindowValue));
 143   /* Clear W[6:0] bits */
 144
 145   tmpreg = WWDG->CFR & CFR_W_Mask;
 146
 147   /* Set W[6:0] bits according to WindowValue value */
 148   tmpreg |= WindowValue & (uint32_t) BIT_Mask;
 149
 150   /* Store the new value */
 151   WWDG->CFR = tmpreg;
 152 }
 153
 154 /**
 155   * @brief  Enables the WWDG Early Wakeup interrupt(EWI).
 156   * @param  None
 157   * @retval None
 158   */
 159 void WWDG_EnableIT(void)
 160 {
 161   *(__IO uint32_t *) CFR_EWI_BB = (uint32_t)ENABLE;
 162 }
 163
 164 /**
 165   * @brief  Sets the WWDG counter value.
 166   * @param  Counter: specifies the watchdog counter value.
 167   *   This parameter must be a number between 0x40 and 0x7F.
 168   * @retval None
 169   */
 170 void WWDG_SetCounter(uint8_t Counter)
 171 {
 172   /* Check the parameters */
 173   assert_param(IS_WWDG_COUNTER(Counter));
 174   /* Write to T[6:0] bits to configure the counter value, no need to do
 175      a read-modify-write; writing a 0 to WDGA bit does nothing */
 176   WWDG->CR = Counter & BIT_Mask;
 177 }
 178
 179 /**
 180   * @brief  Enables WWDG and load the counter value.
 181   * @param  Counter: specifies the watchdog counter value.
 182   *   This parameter must be a number between 0x40 and 0x7F.
 183   * @retval None
 184   */
 185 void WWDG_Enable(uint8_t Counter)
 186 {
 187   /* Check the parameters */
 188   assert_param(IS_WWDG_COUNTER(Counter));
 189   WWDG->CR = CR_WDGA_Set | Counter;
 190 }
 191
 192 /**
 193   * @brief  Checks whether the Early Wakeup interrupt flag is set or not.
 194   * @param  None
 195   * @retval The new state of the Early Wakeup interrupt flag (SET or RESET)
 196   */
 197 FlagStatus WWDG_GetFlagStatus(void)
 198 {
 199   return (FlagStatus)(WWDG->SR);
 200 }
 201
 202 /**
 203   * @brief  Clears Early Wakeup interrupt flag.
 204   * @param  None
 205   * @retval None
 206   */
 207 void WWDG_ClearFlag(void)
 208 {
 209   WWDG->SR = (uint32_t)RESET;
 210 }
 211
 212 /**
 213   * @}
 214   */
 215
 216 /**
 217   * @}
 218   */
 219
 220 /**
 221   * @}
 222   */
 223
 224 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/