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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_iwdg.c @ 0:c59513fd84fb

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Initial commit of STM32 test code.
author Daniel O'Connor <darius@dons.net.au>
date Mon, 03 Oct 2011 21:19:15 +1030
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1 /**
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2 ******************************************************************************
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3 * @file stm32f10x_iwdg.c
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4 * @author MCD Application Team
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5 * @version V3.5.0
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6 * @date 11-March-2011
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7 * @brief This file provides all the IWDG firmware functions.
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8 ******************************************************************************
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9 * @attention
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10 *
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11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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17 *
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18 * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
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19 ******************************************************************************
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20 */
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21
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22 /* Includes ------------------------------------------------------------------*/
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23 #include "stm32f10x_iwdg.h"
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24
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25 /** @addtogroup STM32F10x_StdPeriph_Driver
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26 * @{
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27 */
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28
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29 /** @defgroup IWDG
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30 * @brief IWDG driver modules
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31 * @{
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32 */
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33
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34 /** @defgroup IWDG_Private_TypesDefinitions
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35 * @{
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36 */
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37
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38 /**
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39 * @}
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40 */
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41
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42 /** @defgroup IWDG_Private_Defines
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43 * @{
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44 */
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45
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46 /* ---------------------- IWDG registers bit mask ----------------------------*/
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47
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48 /* KR register bit mask */
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49 #define KR_KEY_Reload ((uint16_t)0xAAAA)
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50 #define KR_KEY_Enable ((uint16_t)0xCCCC)
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51
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52 /**
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53 * @}
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54 */
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55
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56 /** @defgroup IWDG_Private_Macros
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57 * @{
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58 */
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59
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60 /**
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61 * @}
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62 */
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63
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64 /** @defgroup IWDG_Private_Variables
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65 * @{
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66 */
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67
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68 /**
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69 * @}
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70 */
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71
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72 /** @defgroup IWDG_Private_FunctionPrototypes
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73 * @{
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74 */
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75
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76 /**
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77 * @}
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78 */
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79
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80 /** @defgroup IWDG_Private_Functions
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81 * @{
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82 */
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83
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84 /**
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85 * @brief Enables or disables write access to IWDG_PR and IWDG_RLR registers.
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86 * @param IWDG_WriteAccess: new state of write access to IWDG_PR and IWDG_RLR registers.
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87 * This parameter can be one of the following values:
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88 * @arg IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and IWDG_RLR registers
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89 * @arg IWDG_WriteAccess_Disable: Disable write access to IWDG_PR and IWDG_RLR registers
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90 * @retval None
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91 */
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92 void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
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93 {
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94 /* Check the parameters */
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95 assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
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96 IWDG->KR = IWDG_WriteAccess;
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97 }
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98
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99 /**
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100 * @brief Sets IWDG Prescaler value.
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101 * @param IWDG_Prescaler: specifies the IWDG Prescaler value.
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102 * This parameter can be one of the following values:
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103 * @arg IWDG_Prescaler_4: IWDG prescaler set to 4
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104 * @arg IWDG_Prescaler_8: IWDG prescaler set to 8
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105 * @arg IWDG_Prescaler_16: IWDG prescaler set to 16
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106 * @arg IWDG_Prescaler_32: IWDG prescaler set to 32
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107 * @arg IWDG_Prescaler_64: IWDG prescaler set to 64
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108 * @arg IWDG_Prescaler_128: IWDG prescaler set to 128
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109 * @arg IWDG_Prescaler_256: IWDG prescaler set to 256
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110 * @retval None
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111 */
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112 void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
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113 {
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114 /* Check the parameters */
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115 assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));
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116 IWDG->PR = IWDG_Prescaler;
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117 }
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118
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119 /**
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120 * @brief Sets IWDG Reload value.
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121 * @param Reload: specifies the IWDG Reload value.
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122 * This parameter must be a number between 0 and 0x0FFF.
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123 * @retval None
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124 */
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125 void IWDG_SetReload(uint16_t Reload)
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126 {
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127 /* Check the parameters */
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128 assert_param(IS_IWDG_RELOAD(Reload));
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129 IWDG->RLR = Reload;
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130 }
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131
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132 /**
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133 * @brief Reloads IWDG counter with value defined in the reload register
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134 * (write access to IWDG_PR and IWDG_RLR registers disabled).
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135 * @param None
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136 * @retval None
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137 */
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138 void IWDG_ReloadCounter(void)
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139 {
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140 IWDG->KR = KR_KEY_Reload;
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141 }
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142
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143 /**
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144 * @brief Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).
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145 * @param None
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146 * @retval None
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147 */
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148 void IWDG_Enable(void)
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149 {
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150 IWDG->KR = KR_KEY_Enable;
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151 }
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152
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153 /**
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154 * @brief Checks whether the specified IWDG flag is set or not.
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155 * @param IWDG_FLAG: specifies the flag to check.
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156 * This parameter can be one of the following values:
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157 * @arg IWDG_FLAG_PVU: Prescaler Value Update on going
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158 * @arg IWDG_FLAG_RVU: Reload Value Update on going
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159 * @retval The new state of IWDG_FLAG (SET or RESET).
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160 */
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161 FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
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162 {
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163 FlagStatus bitstatus = RESET;
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164 /* Check the parameters */
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165 assert_param(IS_IWDG_FLAG(IWDG_FLAG));
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166 if ((IWDG->SR & IWDG_FLAG) != (uint32_t)RESET)
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167 {
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168 bitstatus = SET;
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169 }
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170 else
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171 {
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172 bitstatus = RESET;
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173 }
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174 /* Return the flag status */
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175 return bitstatus;
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176 }
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177
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178 /**
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179 * @}
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180 */
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181
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182 /**
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183 * @}
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184 */
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185
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186 /**
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187 * @}
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188 */
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189
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190 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/