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annotate src/adc_lightsensor.asm @ 44:18fe4e668baa

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BUGFIX: Percent display with 1,5V batteries
author heinrichsweikamp
date Wed, 28 Aug 2013 15:44:11 +0200
parents 0e1723f2761e
children f3062a611eef
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1 ;=============================================================================
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2 ;
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3 ; File adc.asm
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4 ;
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5 ;
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6 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
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7 ;=============================================================================
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8 ; HISTORY
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9 ; 2011-08-08 : [mH] moving from OSTC code
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10
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11 #include "ostc3.inc"
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12 #include "math.inc"
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13 #include "wait.inc"
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14 #include "eeprom_rs232.inc"
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15
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16 sensors CODE
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17
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18 wait_adc:
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19 movwf ADCON0
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20 nop
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21 bsf ADCON0,1 ; start ADC
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22 wait_adc2:
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23 btfsc ADCON0,1 ; Wait...
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24 bra wait_adc2
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25 return
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26
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27 global get_battery_voltage
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28 get_battery_voltage: ; starts ADC and waits until fnished
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29 bsf adc_running ; =1: The ADC is in use
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30 movlw b'00100000' ; 2.048V Vref+ -> 1LSB = 500µV
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31 movwf ADCON1
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32 movlw b'00011001' ; power on ADC, select AN6
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33 rcall wait_adc
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34
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35 movff ADRESH,batt_voltage+1 ; store value
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36 movff ADRESL,batt_voltage+0 ; store value
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37 bcf ADCON0,0 ; power off ADC
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38
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39 ; Multiply with 2,006 to be excact here...
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40 ; bcf STATUS,C
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41 ; rlcf xA+0,F
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42 ;
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43 ; rlcf xA+1,F ; x2
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44
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45 ; movff xA+0,batt_voltage+0 ; store value
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46 ; movff xA+1,batt_voltage+1
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47
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48 movlw LOW lithium_36v_low
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49 movwf sub_a+0
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50 movlw HIGH lithium_36v_low
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51 movwf sub_a+1
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52 movff batt_voltage+0,sub_b+0
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53 movff batt_voltage+1,sub_b+1
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54 call subU16 ; sub_c = sub_a - sub_b
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55 ; Battery is 3,6V (>lithium_36v_low?)
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56 btfss neg_flag
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57 bra get_battery_voltage4 ; No, use 1,5V
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58
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59 bsf battery_is_36v ; Yes, set flag (Cleared in power-on reset only!)
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60
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61 ; Check if the battery is near-dead already
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62 movlw LOW lithium_36v_empty
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63 movwf sub_a+0
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64 movlw HIGH lithium_36v_empty
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65 movwf sub_a+1
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66 call subU16 ; sub_c = sub_a - sub_b
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67 ; Battery is not dead yet (>lithium_36v_empty?)
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68 btfsc neg_flag
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69 bra get_battery_voltage2 ; Yes, battery is still ok
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70
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71 ; Battery is probably dead very soon
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72 ; Set ">=24Ah used" into battery gauge registers
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73 movlw .128
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74 movff WREG,battery_gauge+5
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75
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76 get_battery_voltage2:
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77 ; Use 3,6V battery gauging mode
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78 movff battery_gauge+5,xC+3
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79 movff battery_gauge+4,xC+2
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80 movff battery_gauge+3,xC+1
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81 movff battery_gauge+2,xC+0
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82 ; battery_gauge:6 is nAs
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83 ; devide through 65536
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84 ; devide through 364
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85 ; Result is in percent of a 2,4Ah Battery
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86 movlw LOW .364
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87 movwf xB+0
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88 movlw HIGH .364
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89 movwf xB+1
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90 call div32x16 ; xC:4 / xB:2 = xC+3:xC+2 with xC+1:xC+0 as remainder
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91 movff xC+0,lo
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92 ; Limit to 100
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93 movlw .100
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94 cpfslt lo
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95 movwf lo
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96 ; lo will be between 0 (Full) and 100 (empty)
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97 movf lo,W
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98 sublw .100
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99 movwf lo
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100 get_battery_voltage3:
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101 movlw .100
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102 cpfslt lo
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103 movwf lo
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104 ; lo will be between 100 (Full) and 0 (empty)
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105
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106 ; use 3,6V battery sensing based on 50mA load
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107 ; 75%
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108 movff batt_voltage+0,sub_b+0
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109 movff batt_voltage+1,sub_b+1
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110 movlw LOW lithium_36v_75
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111 movwf sub_a+0
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112 movlw HIGH lithium_36v_75
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113 movwf sub_a+1
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114 call subU16 ; sub_c = sub_a - sub_b
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115 btfsc neg_flag
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116 bra get_battery_voltage3a
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117 movlw .75
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118 movwf lo
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119 get_battery_voltage3a:
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120 ; 50%
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121 movlw LOW lithium_36v_50
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122 movwf sub_a+0
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123 movlw HIGH lithium_36v_50
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124 movwf sub_a+1
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125 call subU16 ; sub_c = sub_a - sub_b
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126 btfsc neg_flag
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127 bra get_battery_voltage3b
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128 movlw .50
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129 movwf lo
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130 get_battery_voltage3b:
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131 ; 25%
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132 movlw LOW lithium_36v_25
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133 movwf sub_a+0
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134 movlw HIGH lithium_36v_25
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135 movwf sub_a+1
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136 call subU16 ; sub_c = sub_a - sub_b
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137 btfsc neg_flag
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138 bra get_battery_voltage3c
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139 movlw .25
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140 movwf lo
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141 get_battery_voltage3c:
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142 ; 10%
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143 movlw LOW lithium_36v_10
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144 movwf sub_a+0
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145 movlw HIGH lithium_36v_10
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146 movwf sub_a+1
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147 call subU16 ; sub_c = sub_a - sub_b
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148 btfsc neg_flag
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149 bra get_battery_voltage3d
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150 movlw .10
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151 movwf lo
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152 get_battery_voltage3d:
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18fe4e668baa BUGFIX: Percent display with 1,5V batteries
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153 movlw .100
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154 cpfslt lo
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155 movwf lo
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156 ; lo will be between 100 (Full) and 0 (empty)
0
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157 movf batt_percent,W
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158 cpfsgt lo ; keep batt_percent on the lowest value found
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159 movff lo,batt_percent ; store value
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160 ; btfsc battery_is_36v ; but always use computed value for 3,6V battery
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161 ; movff lo,batt_percent ; store value
0
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162 bcf adc_running ; =1: The ADC is in use
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163 return
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164
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165 get_battery_voltage4:
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166 ; Use 1,5V battery voltage mode
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167 ; Use approximation (batt_voltage:2-aa_15v_low)/4 = lo
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168 movff batt_voltage+0,sub_a+0
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169 movff batt_voltage+1,sub_a+1
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170 movlw LOW aa_15v_low
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171 movwf sub_b+0
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172 movlw HIGH aa_15v_low
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173 movwf sub_b+1
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174 call subU16 ; sub_c = sub_a - sub_b
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175 bcf STATUS,C
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176 rrcf sub_c+1
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177 rrcf sub_c+0 ; /2
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178 bcf STATUS,C
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179 rrcf sub_c+1
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180 rrcf sub_c+0 ; /4
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181 movff sub_c+0,lo
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182 bra get_battery_voltage3d ; Check limits and return
0
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183
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184 global get_ambient_level
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185 get_ambient_level: ; starts ADC and waits until finished
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186 btfsc adc_running ; ADC in use?
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187 return ; Yes, return
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188
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189 movlw b'00000000' ; Vref+ = Vdd
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190 movwf ADCON1
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191 movlw b'00011101' ; power on ADC, select AN7
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192 rcall wait_adc
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193
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194 movff ADRESH,ambient_light+1
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195 movff ADRESL,ambient_light+0
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196 bcf ADCON0,0 ; power off ADC
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197
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198 ; ambient_light:2 is between 4096 (direct sunlight) and about 200 (darkness)
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199 ; First: Devide through 16
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200 bcf STATUS,C
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201 rrcf ambient_light+1
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202 rrcf ambient_light+0
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203 bcf STATUS,C
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204 rrcf ambient_light+1
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205 rrcf ambient_light+0
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206 bcf STATUS,C
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207 rrcf ambient_light+1
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208 rrcf ambient_light+0
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209 bcf STATUS,C
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210 rrcf ambient_light+1
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211 rrcf ambient_light+0
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212 ; Result: ambient_light:2/16
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213 ; Now, make sure to have value between ambient_light_low and ambient_light_max
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214
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215 movlw .254
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216 tstfsz ambient_light+1 ; >255?
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217 movwf ambient_light+0 ; avoid ADC clipping
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218
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219 incfsz ambient_light+0,W ; =255?
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220 bra get_ambient_level2 ; No, continue
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221
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222 movlw .254
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223 movwf ambient_light+0 ; avoid ADC clipping
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224
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225 get_ambient_level2:
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226 banksel isr_backup ; Back to Bank0 ISR data
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227 movff opt_brightness,isr1_temp
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228
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229 btfsc RCSTA1,7 ; UART module on?
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230 clrf isr1_temp ; Yes, set temporally to eco mode
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231
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232 incf isr1_temp,F ; adjust 0-2 to 1-3
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233
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234 banksel common ; flag is in bank1
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235 movlw ambient_light_max_high ; brightest setting
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236 btfsc battery_is_36v ; 3,6V battery in use?
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237 movlw ambient_light_max_high_36V ; Yes...
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238 banksel isr_backup ; Back to Bank0 ISR data
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239
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240 dcfsnz isr1_temp,F
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241 movlw ambient_light_max_eco ; brightest setting
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242 dcfsnz isr1_temp,F
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243 movlw ambient_light_max_medium; brightest setting
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244
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245 banksel common ; ambient_light is in Bank1
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246 incf ambient_light+0,F ; +1
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247 cpfslt ambient_light+0 ; smaller then WREG?
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248 movwf ambient_light+0 ; No, set to max.
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249
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250 banksel isr_backup ; Back to Bank0 ISR data
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251 movff opt_brightness,isr1_temp
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252 incf isr1_temp,F ; adjust 0-2 to 1-3
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253 movlw ambient_light_min_high ; darkest setting
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254
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255 dcfsnz isr1_temp,F
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256 movlw ambient_light_min_eco ; darkest setting
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257 dcfsnz isr1_temp,F
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258 movlw ambient_light_min_medium; darkest setting
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259 dcfsnz isr1_temp,F
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260 movlw ambient_light_min_high ; darkest setting
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261
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262 banksel common ; ambient_light is in Bank1
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263 cpfsgt ambient_light+0 ; bigger then WREG?
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264 movwf ambient_light+0 ; No, set to min
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265
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266 movff ambient_light+0,max_CCPR1L ; Store value for dimming in TMR7 interrupt
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267 return
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268
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269 global get_rssi_level
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270 get_rssi_level: ; starts ADC and waits until fnished
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271 bsf adc_running ; =1: The ADC is in use
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272 movlw b'00100000' ; 2.048V Vref+
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273 movwf ADCON1
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274 movlw b'01000101' ; power on ADC, select AN17
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275 rcall wait_adc
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276
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277 movff ADRESL,rssi_value
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278 bcf ADCON0,0 ; power off ADC
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279 bcf adc_running ; =1: The ADC is in use
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280 return
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281
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282 global reset_battery_pointer
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283 reset_battery_pointer: ; Resets battery pointer 0x07-0x0C and battery_gauge:5
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284 clrf EEADRH
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285 clrf EEDATA ; Delete to zero
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286 write_int_eeprom 0x07
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287 write_int_eeprom 0x08
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288 write_int_eeprom 0x09
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289 write_int_eeprom 0x0A
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290 write_int_eeprom 0x0B
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291 write_int_eeprom 0x0C
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292 banksel battery_gauge+0
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293 clrf battery_gauge+0
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294 clrf battery_gauge+1
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295 clrf battery_gauge+2
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296 clrf battery_gauge+3
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297 clrf battery_gauge+4
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298 clrf battery_gauge+5
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299 banksel common
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300 movlw .100
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301 movwf batt_percent
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302 return
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303
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304
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305 END