1 | /** |
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2 | * @file rtems/score/tod.h |
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3 | * |
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4 | * This include file contains all the constants and structures associated |
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5 | * with the Time of Day Handler. |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_TOD_H |
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20 | #define _RTEMS_SCORE_TOD_H |
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21 | |
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22 | /** |
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23 | * @defgroup ScoreTOD Time Of Day (TOD) Handler |
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24 | * |
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25 | * This handler encapsulates functionality used to manage time of day. |
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26 | */ |
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27 | /**@{*/ |
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28 | |
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29 | #ifdef __cplusplus |
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30 | extern "C" { |
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31 | #endif |
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32 | |
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33 | #include <rtems/score/object.h> |
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34 | #include <rtems/score/watchdog.h> |
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35 | #include <time.h> |
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36 | |
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37 | /** @defgroup ScoreTODConstants TOD Constants |
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38 | * The following constants are related to the time of day. |
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39 | */ |
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40 | /**@{*/ |
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41 | |
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42 | /** |
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43 | * This constant represents the number of seconds in a minute. |
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44 | */ |
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45 | #define TOD_SECONDS_PER_MINUTE (uint32_t)60 |
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46 | |
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47 | /** |
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48 | * This constant represents the number of minutes per hour. |
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49 | */ |
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50 | #define TOD_MINUTES_PER_HOUR (uint32_t)60 |
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51 | |
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52 | /** |
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53 | * This constant represents the number of months in a year. |
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54 | */ |
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55 | #define TOD_MONTHS_PER_YEAR (uint32_t)12 |
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56 | |
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57 | /** |
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58 | * This constant represents the number of days in a non-leap year. |
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59 | */ |
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60 | #define TOD_DAYS_PER_YEAR (uint32_t)365 |
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61 | |
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62 | /** |
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63 | * This constant represents the number of hours per day. |
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64 | */ |
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65 | #define TOD_HOURS_PER_DAY (uint32_t)24 |
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66 | |
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67 | /** |
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68 | * This constant represents the number of seconds in a day which does |
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69 | * not include a leap second. |
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70 | */ |
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71 | #define TOD_SECONDS_PER_DAY (uint32_t) (TOD_SECONDS_PER_MINUTE * \ |
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72 | TOD_MINUTES_PER_HOUR * \ |
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73 | TOD_HOURS_PER_DAY) |
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74 | |
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75 | /** |
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76 | * This constant represents the number of seconds in a non-leap year. |
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77 | */ |
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78 | #define TOD_SECONDS_PER_NON_LEAP_YEAR (365 * TOD_SECONDS_PER_DAY) |
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79 | |
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80 | /** |
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81 | * This constant represents the number of seconds in a millisecond. |
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82 | */ |
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83 | #define TOD_MILLISECONDS_PER_SECOND (uint32_t)1000 |
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84 | |
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85 | /** |
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86 | * This constant represents the number of microseconds in a second. |
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87 | */ |
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88 | #define TOD_MICROSECONDS_PER_SECOND (uint32_t)1000000 |
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89 | |
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90 | /** |
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91 | * This constant represents the number of nanoseconds in a second. |
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92 | */ |
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93 | #define TOD_NANOSECONDS_PER_SECOND (uint32_t)1000000000 |
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94 | |
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95 | /** |
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96 | * This constant represents the number of nanoseconds in a second. |
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97 | */ |
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98 | #define TOD_NANOSECONDS_PER_MICROSECOND (uint32_t)1000 |
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99 | |
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100 | /* |
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101 | * Seconds from January 1, 1970 to January 1, 1988. Used to account for |
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102 | * differences between POSIX API and RTEMS core. The timespec format time |
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103 | * is kept in POSIX compliant form. |
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104 | */ |
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105 | #define TOD_SECONDS_1970_THROUGH_1988 \ |
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106 | (((1987 - 1970 + 1) * TOD_SECONDS_PER_NON_LEAP_YEAR) + \ |
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107 | (4 * TOD_SECONDS_PER_DAY)) |
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108 | |
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109 | /**@}*/ |
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110 | |
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111 | /** @brief RTEMS Epoch Year |
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112 | * |
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113 | * The following constant define the earliest year to which an |
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114 | * time of day can be initialized. This is considered the |
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115 | * epoch. |
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116 | */ |
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117 | #define TOD_BASE_YEAR 1988 |
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118 | |
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119 | /** @brief Is the Time Of Day Set |
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120 | * |
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121 | * This is TRUE if the application has set the current |
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122 | * time of day, and FALSE otherwise. |
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123 | */ |
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124 | SCORE_EXTERN boolean _TOD_Is_set; |
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125 | |
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126 | /** @brief Current Time of Day (Timespec) |
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127 | * The following contains the current time of day. |
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128 | */ |
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129 | SCORE_EXTERN struct timespec _TOD_Now; |
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130 | |
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131 | /** @brief Current Time of Day (Timespec) |
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132 | * The following contains the running uptime. |
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133 | */ |
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134 | SCORE_EXTERN struct timespec _TOD_Uptime; |
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135 | |
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136 | /** @brief Seconds Since RTEMS Epoch |
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137 | * The following contains the number of seconds from 00:00:00 |
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138 | * January 1, TOD_BASE_YEAR until the current time of day. |
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139 | */ |
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140 | #define _TOD_Seconds_since_epoch (_TOD_Now.tv_sec) |
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141 | |
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142 | /** @brief Microseconds per Clock Tick |
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143 | * |
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144 | * The following contains the number of microseconds per tick. |
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145 | */ |
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146 | SCORE_EXTERN uint32_t _TOD_Microseconds_per_tick; |
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147 | |
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148 | /** @brief _TOD_Handler_initialization |
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149 | * |
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150 | * This routine performs the initialization necessary for this handler. |
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151 | */ |
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152 | void _TOD_Handler_initialization( |
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153 | uint32_t microseconds_per_tick |
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154 | ); |
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155 | |
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156 | /** @brief _TOD_Set |
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157 | * |
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158 | * This routine sets the current time of day to @a time and |
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159 | * the equivalent SECONDS_SINCE_EPOCH. |
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160 | */ |
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161 | void _TOD_Set( |
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162 | const struct timespec *time |
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163 | ); |
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164 | |
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165 | /** @brief _TOD_Get |
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166 | * |
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167 | * This routine returns the current time of day with potential accuracy |
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168 | * to the nanosecond. |
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169 | * |
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170 | * @param[in] time is a pointer to the time to be returned |
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171 | */ |
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172 | void _TOD_Get( |
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173 | struct timespec *time |
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174 | ); |
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175 | |
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176 | /** @brief _TOD_Get_uptime |
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177 | * |
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178 | * This routine returns the system uptime with potential accuracy |
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179 | * to the nanosecond. |
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180 | * |
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181 | * @param[in] time is a pointer to the uptime to be returned |
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182 | */ |
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183 | void _TOD_Get_uptime( |
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184 | struct timespec *time |
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185 | ); |
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186 | |
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187 | /** |
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188 | * This routine increments the ticks field of the current time of |
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189 | * day at each clock tick. |
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190 | */ |
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191 | void _TOD_Tickle_ticks( void ); |
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192 | |
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193 | /** @brief TOD_MILLISECONDS_TO_MICROSECONDS |
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194 | * |
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195 | * This routine converts an interval expressed in milliseconds to microseconds. |
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196 | * |
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197 | * @note This must be a macro so it can be used in "static" tables. |
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198 | */ |
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199 | #define TOD_MILLISECONDS_TO_MICROSECONDS(_ms) ((uint32_t)(_ms) * 1000L) |
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200 | |
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201 | /** @brief TOD_MICROSECONDS_TO_TICKS |
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202 | * |
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203 | * This routine converts an interval expressed in microseconds to ticks. |
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204 | * |
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205 | * @note This must be a macro so it can be used in "static" tables. |
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206 | */ |
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207 | #define TOD_MICROSECONDS_TO_TICKS(_us) \ |
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208 | ((_us) / _TOD_Microseconds_per_tick) |
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209 | |
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210 | /** @brief TOD_MILLISECONDS_TO_TICKS |
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211 | * |
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212 | * This routine converts an interval expressed in milliseconds to ticks. |
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213 | * |
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214 | * @note This must be a macro so it can be used in "static" tables. |
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215 | */ |
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216 | |
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217 | #define TOD_MILLISECONDS_TO_TICKS(_ms) \ |
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218 | (TOD_MILLISECONDS_TO_MICROSECONDS(_ms) / _TOD_Microseconds_per_tick) |
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219 | |
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220 | |
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221 | /** @brief How many ticks in a second? |
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222 | * |
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223 | * This macro returns the number of ticks in a second. |
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224 | * |
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225 | * @note If the clock tick value does not multiply evenly into a second |
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226 | * then this number of ticks will be slightly shorter than a second. |
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227 | */ |
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228 | #define TOD_TICKS_PER_SECOND \ |
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229 | (TOD_MICROSECONDS_PER_SECOND / _TOD_Microseconds_per_tick) |
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230 | |
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231 | #ifndef __RTEMS_APPLICATION__ |
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232 | #include <rtems/score/tod.inl> |
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233 | #endif |
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234 | |
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235 | #ifdef __cplusplus |
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236 | } |
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237 | #endif |
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238 | |
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239 | /**@}*/ |
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240 | |
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241 | #endif |
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242 | /* end of include file */ |
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