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annotate packages/devs/wallclock/dallas/ds1742/current/ds1742.inl @ 94:4642a6d35749 ecos-sw-2000-06-02

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Merge from eCos master repository on 2000-06-02-07:47:04-BST
author jlarmour
date Fri, 02 Jun 2000 17:35:00 +0000
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children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // devs/wallclock/ds1742.inl
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4 //
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5 // Wallclock implementation for Dallas 1742
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jskov
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35 // Contributors: jskov
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36 // Date: 2000-05-25
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37 // Purpose: Wallclock driver for Dallas 1742
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //==========================================================================
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42
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43 #ifndef DS_BASE
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44 # error "Need to know base of DS1742 RAM"
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45 #endif
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46
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47 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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48 #include <cyg/hal/hal_io.h> // IO macros
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49
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50 // Offsets from DS_BASE
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51 #define DS_SECONDS 0x7f9 // control bit!
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52 #define DS_SECONDS_MASK 0x7f
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53 #define DS_MINUTES 0x7fa
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54 #define DS_HOUR 0x7fb
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55 #define DS_DAY 0x7fc // control bits
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56 #define DS_DAY_MASK 0x07
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57 #define DS_DATE 0x7fd
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58 #define DS_MONTH 0x7fe
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59 #define DS_YEAR 0x7ff
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60 #define DS_CENTURY 0x7f8 // control bits!
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61 #define DS_CENTURY_MASK 0x3f
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62
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63 // Control bits
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64 #define DS_SECONDS_OSC 0x80 // set to stop oscillator (power save)
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65 #define DS_CENTURY_READ 0x40 // set during read
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66 #define DS_CENTURY_WRITE 0x80 // set during write
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67 #define DS_DAY_BF 0x80 // battery flag
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68 #define DS_DAY_FT 0x40 // frequency test
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69
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70
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71 // Make sure test modes are disabled and that clock is running.
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72 static void
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73 init_ds_hwclock(void)
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74 {
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75 cyg_uint8 _tmp;
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76
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77 // Enable clock
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78 HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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79 _tmp &= ~DS_SECONDS_OSC;
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80 HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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81
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82 // clear frequency test
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83 HAL_READ_UINT8(DS_BASE+DS_DAY, _tmp);
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84 _tmp &= ~DS_DAY_FT;
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85 HAL_WRITE_UINT8(DS_BASE+DS_DAY, _tmp);
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86 }
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87
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88
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89 static void
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90 set_ds_hwclock(cyg_uint32 year, cyg_uint32 month, cyg_uint32 mday,
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91 cyg_uint32 hour, cyg_uint32 minute, cyg_uint32 second)
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92 {
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93 cyg_uint8 _tmp;
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94 // Init write operation
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95 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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96 _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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97 _tmp |= DS_CENTURY_WRITE;
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98 HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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99
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100 // Entries with control bits
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101 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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102 _tmp &= ~DS_CENTURY_MASK;
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103 _tmp |= TO_BCD(year/100) & DS_CENTURY_MASK;
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104 HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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105
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106 HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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107 _tmp &= ~DS_SECONDS_MASK;
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108 _tmp |= TO_BCD(second) & DS_SECONDS_MASK;
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109 HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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110
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111 HAL_READ_UINT8(DS_BASE+DS_DAY, _tmp);
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112 _tmp &= ~DS_DAY_FT; // clear frequency test
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113 HAL_WRITE_UINT8(DS_BASE+DS_DAY, _tmp);
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114
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115
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116 // Dedicated entries
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117 HAL_WRITE_UINT8(DS_BASE+DS_YEAR, TO_BCD(year % 100));
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118 HAL_WRITE_UINT8(DS_BASE+DS_MONTH, TO_BCD(month));
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119 HAL_WRITE_UINT8(DS_BASE+DS_DATE, TO_BCD(mday));
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120 HAL_WRITE_UINT8(DS_BASE+DS_HOUR, TO_BCD(hour));
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121 HAL_WRITE_UINT8(DS_BASE+DS_MINUTES, TO_BCD(minute));
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122
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123 // Enable clock
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124 HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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125 _tmp &= ~DS_SECONDS_OSC;
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126 HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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127
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128 // Finish write operation
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129 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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130 _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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131 HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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132 }
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133
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134 static void
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135 get_ds_hwclock(cyg_uint32* year, cyg_uint32* month, cyg_uint32* mday,
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136 cyg_uint32* hour, cyg_uint32* minute, cyg_uint32* second)
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137 {
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138 cyg_uint8 _tmp;
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139
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140 // Init read operation
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141 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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142 _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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143 _tmp |= DS_CENTURY_READ;
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144 HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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145
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146 // Entries with control bits
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147 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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148 _tmp &= DS_CENTURY_MASK;
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149 *year = 100*TO_DEC(_tmp);
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150
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151 HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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152 _tmp &= DS_SECONDS_MASK;
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153 *second = TO_DEC(_tmp);
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154
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155 // Dedicated entries
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156 HAL_READ_UINT8(DS_BASE+DS_YEAR, _tmp);
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157 *year += TO_DEC(_tmp);
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158 HAL_READ_UINT8(DS_BASE+DS_MONTH, _tmp);
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159 *month = TO_DEC(_tmp);
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160 HAL_READ_UINT8(DS_BASE+DS_DATE, _tmp);
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161 *mday = TO_DEC(_tmp);
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162 HAL_READ_UINT8(DS_BASE+DS_HOUR, _tmp);
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163 *hour = TO_DEC(_tmp);
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164 HAL_READ_UINT8(DS_BASE+DS_MINUTES, _tmp);
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165 *minute = TO_DEC(_tmp);
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166
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167 // Finish read operation
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168 HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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169 _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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170 HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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171 }
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172
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173 //-----------------------------------------------------------------------------
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174 // End of devs/wallclock/ds1742.inl