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2 ; OSTC - diving computer code
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3 ; Copyright (C) 2008 HeinrichsWeikamp GbR
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4
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5 ; This program is free software: you can redistribute it and/or modify
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6 ; it under the terms of the GNU General Public License as published by
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7 ; the Free Software Foundation, either version 3 of the License, or
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8 ; (at your option) any later version.
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9
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10 ; This program is distributed in the hope that it will be useful,
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11 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ; GNU General Public License for more details.
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14
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15 ; You should have received a copy of the GNU General Public License
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16 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
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17
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18
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19 ; routines for AD converter, Realtime clock initialisation
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20 ; written by: Matthias Heinrichs, info@heinrichsweikamp.com
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21 ; written: 10/30/05
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22 ; last updated: 05/15/08
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23 ; known bugs:
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24 ; ToDo:
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25
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26 get_battery_voltage: ; starts ADC and waits until fnished
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27 bsf ADCON0,0 ; power on ADC
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28 nop
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29 bsf ADCON0,1 ; start ADC
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30 get_battery_voltage2:
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31 btfsc ADCON0,1 ; Wait...
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32 bra get_battery_voltage2
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33
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34 ; 3.3V/1024=3,2227mV Input/Bit=9,6680mV Battery/Bit.
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35 ; Example: 434*9,6680mV=4195,9mV Battery.
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36
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37 movff ADRESH,xA+1
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38 movff ADRESL,xA+0
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39 movlw LOW d'966'
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40 movwf xB+0
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41 movlw HIGH d'966'
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42 movwf xB+1
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43 call mult16x16 ; AD_Result*966
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44 movlw d'100'
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45 movwf xB+0
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46 clrf xB+1
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47 call div32x16 ;xC:4 / xB:2 = xC+3:xC+2 with xC+1:xC+0 as remainder
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48 movff xC+0,batt_voltage+0 ; store value
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49 movff xC+1,batt_voltage+1
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50 bcf ADCON0,0 ; power off ADC
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51
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52 ; Check if we should enter deep-sleep mode
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53
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54 movff batt_voltage+0,sub_b+0
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55 movff batt_voltage+1,sub_b+1
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56 movlw LOW d'2600' ; must be greater then 2600mV...
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57 movwf sub_a+0
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58 movlw HIGH d'2600'
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59 movwf sub_a+1
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60 call sub16 ; sub_c = sub_a - sub_b
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61 bcf enter_error_sleep ; Clear flag
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62 btfsc neg_flag ; neg_flag=1 if eeprom40:41 < 2000
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63 bra get_battery_voltage3 ; Battery in OK range
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64
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65 movlw d'2'
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66 movwf fatal_error_code ; Battery very low!
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67 bsf enter_error_sleep ; enter error routine
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68
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69 get_battery_voltage3:
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70 movff amb_pressure+0,sub_b+0
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71 movff amb_pressure+1,sub_b+1
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72 movlw LOW d'15001' ; must be lower then 15001mBar
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73 movwf sub_a+0
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74 movlw HIGH d'15001'
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75 movwf sub_a+1
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76 call sub16 ; sub_c = sub_a - sub_b
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77 bcf enter_error_sleep ; Clear flag
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78 btfss neg_flag ;
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79 bra get_battery_voltage4 ; Pressure in OK range
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80
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81 movlw d'3'
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82 movwf fatal_error_code ; too deep
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83 bsf enter_error_sleep ; enter error routine
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84 ; Continue with rest of routine
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85
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86 get_battery_voltage4:
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87 ; check if the battery control memory needs to be initialised!
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88 bcf initialize_battery1 ; clear check-flags
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89 bcf initialize_battery2
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90
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91 read_int_eeprom d'40' ; get lowest battery voltage seen in mV
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92 movff EEDATA,sub_b+0
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93 read_int_eeprom d'41'
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94 movff EEDATA,sub_b+1
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95
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96 movlw LOW d'2000' ; must be greater then 2000mV...
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97 movwf sub_a+0
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98 movlw HIGH d'2000'
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99 movwf sub_a+1
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100 call sub16 ; sub_c = sub_a - sub_b
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101 btfss neg_flag ; neg_flag=1 if eeprom40:41 < 2000
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102 bsf initialize_battery1 ; battery need to be initialised
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103
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104 movlw LOW d'4500' ; must be lower then 4500mV...
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105 movwf sub_a+0
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106 movlw HIGH d'4500'
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107 movwf sub_a+1
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108 call sub16 ; sub_c = sub_a - sub_b
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109 btfss neg_flag ; neg_flag=1 if eeprom40:41 < 4500
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110 bsf initialize_battery2 ; battery need to be initialised
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111
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112 btfss initialize_battery1 ; battery need to be initialised?
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113 bra get_battery_no_init ; No, we have already valid values, just check for new extremas
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114
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115 btfss initialize_battery2 ; battery need to be initialised?
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116 bra get_battery_no_init ; No, we have already valid values, just check for new extremas
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117
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118 ; Init EEPROM for battery control
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119 ; Reset lowest battery seen
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120 movlw LOW d'4200' ; reset to 4.2V
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121 movwf EEDATA
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122 write_int_eeprom d'40'
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123 movlw HIGH d'4200' ; reset to 4.2V
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124 movwf EEDATA
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125 write_int_eeprom d'41'
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126 movff month,EEDATA
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127 write_int_eeprom d'42'
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128 movff day,EEDATA
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129 write_int_eeprom d'43'
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130 movff year,EEDATA
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131 write_int_eeprom d'44'
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132 movff temperature+0,EEDATA
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133 write_int_eeprom d'45'
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134 movff temperature+1,EEDATA
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135 write_int_eeprom d'46'
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136 ; Reset charge statistics
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137 clrf EEDATA ; last complete charge
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138 write_int_eeprom d'47'
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139 clrf EEDATA ; last complete charge
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140 write_int_eeprom d'48'
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141 clrf EEDATA ; last complete charge
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142 write_int_eeprom d'49'
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143 clrf EEDATA ; total cycles
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144 write_int_eeprom d'50'
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145 clrf EEDATA ; total cycles
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146 write_int_eeprom d'51'
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147 clrf EEDATA ; total complete cycles
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148 write_int_eeprom d'52'
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149 clrf EEDATA ; total complete cycles
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150 write_int_eeprom d'53'
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151 ; Reset temperature extremas
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152 movff temperature+0,EEDATA ; Reset mimimum extrema
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153 write_int_eeprom d'54'
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154 movff temperature+1,EEDATA
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155 write_int_eeprom d'55'
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156 movff month,EEDATA
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157 write_int_eeprom d'56'
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158 movff day,EEDATA
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159 write_int_eeprom d'57'
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160 movff year,EEDATA
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161 write_int_eeprom d'58'
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162 movff temperature+0,EEDATA ; Reset maximum extrema
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163 write_int_eeprom d'59'
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164 movff temperature+1,EEDATA
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165 write_int_eeprom d'60'
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166 movff month,EEDATA
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167 write_int_eeprom d'61'
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168 movff day,EEDATA
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169 write_int_eeprom d'62'
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170 movff year,EEDATA
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171 write_int_eeprom d'63'
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172
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173 get_battery_no_init:
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174 read_int_eeprom d'40' ; get lowest battery voltage seen in mV
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175 movff EEDATA,sub_b+0
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176 read_int_eeprom d'41'
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177 movff EEDATA,sub_b+1
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178 movff batt_voltage+0,sub_a+0
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179 movff batt_voltage+1,sub_a+1
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180 call sub16 ; sub_c = sub_a - sub_b
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181 btfss neg_flag ; new lowest battery voltage?
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182 return ; no, quit routine
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183 ; Yes, store new value together with the date and temperature values
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184 movff batt_voltage+0,EEDATA
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185 write_int_eeprom d'40'
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186 movff batt_voltage+1,EEDATA
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187 write_int_eeprom d'41'
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188 movff month,EEDATA
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189 write_int_eeprom d'42'
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190 movff day,EEDATA
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191 write_int_eeprom d'43'
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192 movff year,EEDATA
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193 write_int_eeprom d'44'
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194 movff temperature+0,EEDATA
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195 write_int_eeprom d'45'
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196 movff temperature+1,EEDATA
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197 write_int_eeprom d'46'
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198 return
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199
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200 RTCinit: ; resets RTC
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201 movlw 0x80
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202 movwf TMR1H
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203 clrf TMR1L
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204
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205 ; Reset RTC if any part of the time/date is out of range
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206 movlw d'60' ; Limit
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207 cpfslt secs ; Check part
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208 bra RTCinit2 ; Reset time...
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209 movlw d'60' ; Limit
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210 cpfslt mins ; Check part
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211 bra RTCinit2 ; Reset time...
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212 movlw d'24' ; Limit
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213 cpfslt hours ; Check part
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214 bra RTCinit2 ; Reset time...
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215 movlw d'32' ; Limit
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216 cpfslt day ; Check part
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217 bra RTCinit2 ; Reset time...
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218 movlw d'12' ; Limit
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219 cpfslt month ; Check part
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220 bra RTCinit2 ; Reset time...
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221 movlw d'100' ; Limit
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222 cpfslt year ; Check part
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223 bra RTCinit2 ; Reset time...
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224
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225 bsf PIE1, TMR1IE
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226 return
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227
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228 RTCinit2:
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229 movlw .00
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230 movwf secs
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231 movlw .00
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232 movwf mins
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233 movlw .12
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234 movwf hours
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235 movlw .2
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236 movwf day
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237 movlw .8
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238 movwf month
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239 movlw .09
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240 movwf year
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241 bsf PIE1, TMR1IE
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242 return |
