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3328 povik 1 /**
2 ******************************************************************************
3 * @file stm32f10x_iwdg.c
4 * @author MCD Application Team
5 * @version V3.1.0
6 * @date 06/19/2009
7 * @brief This file provides all the IWDG firmware functions.
8 ******************************************************************************
9 * @copy
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 2009 STMicroelectronics</center></h2>
19 */
20  
21 /* Includes ------------------------------------------------------------------*/
22 #include "stm32f10x_iwdg.h"
23  
24 /** @addtogroup STM32F10x_StdPeriph_Driver
25 * @{
26 */
27  
28 /** @defgroup IWDG
29 * @brief IWDG driver modules
30 * @{
31 */
32  
33 /** @defgroup IWDG_Private_TypesDefinitions
34 * @{
35 */
36  
37 /**
38 * @}
39 */
40  
41 /** @defgroup IWDG_Private_Defines
42 * @{
43 */
44  
45 /* ---------------------- IWDG registers bit mask ----------------------------*/
46  
47 /* KR register bit mask */
48 #define KR_KEY_Reload ((uint16_t)0xAAAA)
49 #define KR_KEY_Enable ((uint16_t)0xCCCC)
50  
51 /**
52 * @}
53 */
54  
55 /** @defgroup IWDG_Private_Macros
56 * @{
57 */
58  
59 /**
60 * @}
61 */
62  
63 /** @defgroup IWDG_Private_Variables
64 * @{
65 */
66  
67 /**
68 * @}
69 */
70  
71 /** @defgroup IWDG_Private_FunctionPrototypes
72 * @{
73 */
74  
75 /**
76 * @}
77 */
78  
79 /** @defgroup IWDG_Private_Functions
80 * @{
81 */
82  
83 /**
84 * @brief Enables or disables write access to IWDG_PR and IWDG_RLR registers.
85 * @param IWDG_WriteAccess: new state of write access to IWDG_PR and IWDG_RLR registers.
86 * This parameter can be one of the following values:
87 * @arg IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and IWDG_RLR registers
88 * @arg IWDG_WriteAccess_Disable: Disable write access to IWDG_PR and IWDG_RLR registers
89 * @retval None
90 */
91 void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
92 {
93 /* Check the parameters */
94 assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
95 IWDG->KR = IWDG_WriteAccess;
96 }
97  
98 /**
99 * @brief Sets IWDG Prescaler value.
100 * @param IWDG_Prescaler: specifies the IWDG Prescaler value.
101 * This parameter can be one of the following values:
102 * @arg IWDG_Prescaler_4: IWDG prescaler set to 4
103 * @arg IWDG_Prescaler_8: IWDG prescaler set to 8
104 * @arg IWDG_Prescaler_16: IWDG prescaler set to 16
105 * @arg IWDG_Prescaler_32: IWDG prescaler set to 32
106 * @arg IWDG_Prescaler_64: IWDG prescaler set to 64
107 * @arg IWDG_Prescaler_128: IWDG prescaler set to 128
108 * @arg IWDG_Prescaler_256: IWDG prescaler set to 256
109 * @retval None
110 */
111 void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
112 {
113 /* Check the parameters */
114 assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));
115 IWDG->PR = IWDG_Prescaler;
116 }
117  
118 /**
119 * @brief Sets IWDG Reload value.
120 * @param Reload: specifies the IWDG Reload value.
121 * This parameter must be a number between 0 and 0x0FFF.
122 * @retval None
123 */
124 void IWDG_SetReload(uint16_t Reload)
125 {
126 /* Check the parameters */
127 assert_param(IS_IWDG_RELOAD(Reload));
128 IWDG->RLR = Reload;
129 }
130  
131 /**
132 * @brief Reloads IWDG counter with value defined in the reload register
133 * (write access to IWDG_PR and IWDG_RLR registers disabled).
134 * @param None
135 * @retval None
136 */
137 void IWDG_ReloadCounter(void)
138 {
139 IWDG->KR = KR_KEY_Reload;
140 }
141  
142 /**
143 * @brief Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).
144 * @param None
145 * @retval None
146 */
147 void IWDG_Enable(void)
148 {
149 IWDG->KR = KR_KEY_Enable;
150 }
151  
152 /**
153 * @brief Checks whether the specified IWDG flag is set or not.
154 * @param IWDG_FLAG: specifies the flag to check.
155 * This parameter can be one of the following values:
156 * @arg IWDG_FLAG_PVU: Prescaler Value Update on going
157 * @arg IWDG_FLAG_RVU: Reload Value Update on going
158 * @retval The new state of IWDG_FLAG (SET or RESET).
159 */
160 FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
161 {
162 FlagStatus bitstatus = RESET;
163 /* Check the parameters */
164 assert_param(IS_IWDG_FLAG(IWDG_FLAG));
165 if ((IWDG->SR & IWDG_FLAG) != (uint32_t)RESET)
166 {
167 bitstatus = SET;
168 }
169 else
170 {
171 bitstatus = RESET;
172 }
173 /* Return the flag status */
174 return bitstatus;
175 }
176  
177 /**
178 * @}
179 */
180  
181 /**
182 * @}
183 */
184  
185 /**
186 * @}
187 */
188  
189 /******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/