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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_rtc.c @ 48:2f336d212c74

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author Daniel O'Connor <darius@dons.net.au>
date Wed, 03 Apr 2013 23:33:47 +1030
parents c59513fd84fb
children
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1 /**
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2 ******************************************************************************
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3 * @file stm32f10x_rtc.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 RTC 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_rtc.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 RTC
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30 * @brief RTC driver modules
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31 * @{
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32 */
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33
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34 /** @defgroup RTC_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 /** @defgroup RTC_Private_Defines
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42 * @{
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43 */
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44 #define RTC_LSB_MASK ((uint32_t)0x0000FFFF) /*!< RTC LSB Mask */
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45 #define PRLH_MSB_MASK ((uint32_t)0x000F0000) /*!< RTC Prescaler MSB Mask */
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46
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47 /**
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48 * @}
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49 */
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50
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51 /** @defgroup RTC_Private_Macros
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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 * @}
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57 */
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58
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59 /** @defgroup RTC_Private_Variables
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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 * @}
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65 */
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66
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67 /** @defgroup RTC_Private_FunctionPrototypes
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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 * @}
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73 */
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74
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75 /** @defgroup RTC_Private_Functions
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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 * @brief Enables or disables the specified RTC interrupts.
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81 * @param RTC_IT: specifies the RTC interrupts sources to be enabled or disabled.
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82 * This parameter can be any combination of the following values:
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83 * @arg RTC_IT_OW: Overflow interrupt
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84 * @arg RTC_IT_ALR: Alarm interrupt
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85 * @arg RTC_IT_SEC: Second interrupt
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86 * @param NewState: new state of the specified RTC interrupts.
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87 * This parameter can be: ENABLE or DISABLE.
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88 * @retval None
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89 */
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90 void RTC_ITConfig(uint16_t RTC_IT, FunctionalState NewState)
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91 {
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92 /* Check the parameters */
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93 assert_param(IS_RTC_IT(RTC_IT));
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94 assert_param(IS_FUNCTIONAL_STATE(NewState));
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95
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96 if (NewState != DISABLE)
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97 {
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98 RTC->CRH |= RTC_IT;
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99 }
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100 else
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101 {
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102 RTC->CRH &= (uint16_t)~RTC_IT;
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103 }
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104 }
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105
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106 /**
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107 * @brief Enters the RTC configuration mode.
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108 * @param None
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109 * @retval None
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110 */
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111 void RTC_EnterConfigMode(void)
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112 {
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113 /* Set the CNF flag to enter in the Configuration Mode */
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114 RTC->CRL |= RTC_CRL_CNF;
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115 }
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116
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117 /**
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118 * @brief Exits from the RTC configuration mode.
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119 * @param None
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120 * @retval None
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121 */
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122 void RTC_ExitConfigMode(void)
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123 {
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124 /* Reset the CNF flag to exit from the Configuration Mode */
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125 RTC->CRL &= (uint16_t)~((uint16_t)RTC_CRL_CNF);
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126 }
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127
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128 /**
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129 * @brief Gets the RTC counter value.
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130 * @param None
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131 * @retval RTC counter value.
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132 */
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133 uint32_t RTC_GetCounter(void)
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134 {
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135 uint16_t tmp = 0;
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136 tmp = RTC->CNTL;
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137 return (((uint32_t)RTC->CNTH << 16 ) | tmp) ;
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138 }
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139
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140 /**
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141 * @brief Sets the RTC counter value.
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142 * @param CounterValue: RTC counter new value.
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143 * @retval None
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144 */
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145 void RTC_SetCounter(uint32_t CounterValue)
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146 {
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147 RTC_EnterConfigMode();
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148 /* Set RTC COUNTER MSB word */
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149 RTC->CNTH = CounterValue >> 16;
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150 /* Set RTC COUNTER LSB word */
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151 RTC->CNTL = (CounterValue & RTC_LSB_MASK);
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152 RTC_ExitConfigMode();
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153 }
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154
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155 /**
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156 * @brief Sets the RTC prescaler value.
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157 * @param PrescalerValue: RTC prescaler new value.
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158 * @retval None
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159 */
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160 void RTC_SetPrescaler(uint32_t PrescalerValue)
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161 {
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162 /* Check the parameters */
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163 assert_param(IS_RTC_PRESCALER(PrescalerValue));
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164
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165 RTC_EnterConfigMode();
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166 /* Set RTC PRESCALER MSB word */
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167 RTC->PRLH = (PrescalerValue & PRLH_MSB_MASK) >> 16;
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168 /* Set RTC PRESCALER LSB word */
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169 RTC->PRLL = (PrescalerValue & RTC_LSB_MASK);
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170 RTC_ExitConfigMode();
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171 }
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172
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173 /**
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174 * @brief Sets the RTC alarm value.
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175 * @param AlarmValue: RTC alarm new value.
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176 * @retval None
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177 */
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178 void RTC_SetAlarm(uint32_t AlarmValue)
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179 {
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180 RTC_EnterConfigMode();
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181 /* Set the ALARM MSB word */
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182 RTC->ALRH = AlarmValue >> 16;
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183 /* Set the ALARM LSB word */
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184 RTC->ALRL = (AlarmValue & RTC_LSB_MASK);
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185 RTC_ExitConfigMode();
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186 }
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187
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188 /**
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189 * @brief Gets the RTC divider value.
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190 * @param None
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191 * @retval RTC Divider value.
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192 */
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193 uint32_t RTC_GetDivider(void)
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194 {
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195 uint32_t tmp = 0x00;
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196 tmp = ((uint32_t)RTC->DIVH & (uint32_t)0x000F) << 16;
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197 tmp |= RTC->DIVL;
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198 return tmp;
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199 }
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200
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201 /**
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202 * @brief Waits until last write operation on RTC registers has finished.
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203 * @note This function must be called before any write to RTC registers.
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204 * @param None
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205 * @retval None
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206 */
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207 void RTC_WaitForLastTask(void)
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208 {
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209 /* Loop until RTOFF flag is set */
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210 while ((RTC->CRL & RTC_FLAG_RTOFF) == (uint16_t)RESET)
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211 {
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212 }
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213 }
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214
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215 /**
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216 * @brief Waits until the RTC registers (RTC_CNT, RTC_ALR and RTC_PRL)
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217 * are synchronized with RTC APB clock.
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218 * @note This function must be called before any read operation after an APB reset
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219 * or an APB clock stop.
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220 * @param None
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221 * @retval None
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222 */
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223 void RTC_WaitForSynchro(void)
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224 {
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225 /* Clear RSF flag */
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226 RTC->CRL &= (uint16_t)~RTC_FLAG_RSF;
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227 /* Loop until RSF flag is set */
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228 while ((RTC->CRL & RTC_FLAG_RSF) == (uint16_t)RESET)
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229 {
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230 }
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231 }
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232
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233 /**
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234 * @brief Checks whether the specified RTC flag is set or not.
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235 * @param RTC_FLAG: specifies the flag to check.
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236 * This parameter can be one the following values:
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237 * @arg RTC_FLAG_RTOFF: RTC Operation OFF flag
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238 * @arg RTC_FLAG_RSF: Registers Synchronized flag
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239 * @arg RTC_FLAG_OW: Overflow flag
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240 * @arg RTC_FLAG_ALR: Alarm flag
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241 * @arg RTC_FLAG_SEC: Second flag
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242 * @retval The new state of RTC_FLAG (SET or RESET).
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243 */
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244 FlagStatus RTC_GetFlagStatus(uint16_t RTC_FLAG)
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245 {
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246 FlagStatus bitstatus = RESET;
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247
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248 /* Check the parameters */
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249 assert_param(IS_RTC_GET_FLAG(RTC_FLAG));
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250
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251 if ((RTC->CRL & RTC_FLAG) != (uint16_t)RESET)
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252 {
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253 bitstatus = SET;
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254 }
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255 else
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256 {
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257 bitstatus = RESET;
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258 }
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259 return bitstatus;
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260 }
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261
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262 /**
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263 * @brief Clears the RTC's pending flags.
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264 * @param RTC_FLAG: specifies the flag to clear.
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265 * This parameter can be any combination of the following values:
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266 * @arg RTC_FLAG_RSF: Registers Synchronized flag. This flag is cleared only after
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267 * an APB reset or an APB Clock stop.
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268 * @arg RTC_FLAG_OW: Overflow flag
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269 * @arg RTC_FLAG_ALR: Alarm flag
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270 * @arg RTC_FLAG_SEC: Second flag
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271 * @retval None
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272 */
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273 void RTC_ClearFlag(uint16_t RTC_FLAG)
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274 {
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275 /* Check the parameters */
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276 assert_param(IS_RTC_CLEAR_FLAG(RTC_FLAG));
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277
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278 /* Clear the corresponding RTC flag */
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279 RTC->CRL &= (uint16_t)~RTC_FLAG;
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280 }
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281
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282 /**
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283 * @brief Checks whether the specified RTC interrupt has occurred or not.
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284 * @param RTC_IT: specifies the RTC interrupts sources to check.
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285 * This parameter can be one of the following values:
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286 * @arg RTC_IT_OW: Overflow interrupt
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287 * @arg RTC_IT_ALR: Alarm interrupt
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288 * @arg RTC_IT_SEC: Second interrupt
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289 * @retval The new state of the RTC_IT (SET or RESET).
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290 */
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291 ITStatus RTC_GetITStatus(uint16_t RTC_IT)
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292 {
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293 ITStatus bitstatus = RESET;
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294 /* Check the parameters */
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295 assert_param(IS_RTC_GET_IT(RTC_IT));
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296
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297 bitstatus = (ITStatus)(RTC->CRL & RTC_IT);
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298 if (((RTC->CRH & RTC_IT) != (uint16_t)RESET) && (bitstatus != (uint16_t)RESET))
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299 {
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300 bitstatus = SET;
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301 }
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302 else
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303 {
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304 bitstatus = RESET;
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305 }
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306 return bitstatus;
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307 }
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308
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309 /**
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310 * @brief Clears the RTC's interrupt pending bits.
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311 * @param RTC_IT: specifies the interrupt pending bit to clear.
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312 * This parameter can be any combination of the following values:
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313 * @arg RTC_IT_OW: Overflow interrupt
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314 * @arg RTC_IT_ALR: Alarm interrupt
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315 * @arg RTC_IT_SEC: Second interrupt
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316 * @retval None
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317 */
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318 void RTC_ClearITPendingBit(uint16_t RTC_IT)
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319 {
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320 /* Check the parameters */
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321 assert_param(IS_RTC_IT(RTC_IT));
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322
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323 /* Clear the corresponding RTC pending bit */
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324 RTC->CRL &= (uint16_t)~RTC_IT;
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325 }
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326
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327 /**
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328 * @}
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329 */
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330
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331 /**
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332 * @}
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333 */
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334
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335 /**
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336 * @}
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337 */
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338
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339 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/