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annotate code_part1/OSTC_code_asm_part1/math.asm @ 668:8f8d39117ff7

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always start with normal GF
author heinrichsweikamp
date Sun, 02 Dec 2012 23:24:52 +0100
parents e3ffc6d62a63
children c50296c3059e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ; OSTC - diving computer code
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2 ; Copyright (C) 2008 HeinrichsWeikamp GbR
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3
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4 ; This program is free software: you can redistribute it and/or modify
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5 ; it under the terms of the GNU General Public License as published by
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6 ; the Free Software Foundation, either version 3 of the License, or
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7 ; (at your option) any later version.
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8
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9 ; This program is distributed in the hope that it will be useful,
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10 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ; GNU General Public License for more details.
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13
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14 ; You should have received a copy of the GNU General Public License
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15 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
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16
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17
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18 ; Math routines
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8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
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19 ; history:
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
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20 ; 2005-10-30: Written by Matthias Heinrichs, info@heinrichsweikamp.com
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21 ; 2007-06-21: MH last updated
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22 ; 2011-01-19: Clean up of isr variante.
0
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23 ; known bugs:
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24 ; ToDo: clean up!
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25
88
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26
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27 convert_time: ; converts hi:lo in minutes to hours (hi) and minutes (lo)
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28 movff lo,xA+0 ; divide by 60...
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29 movff hi,xA+1 ;
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30 movlw d'60' ;
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31 movwf xB+0 ;
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32 clrf xB+1 ;
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33 rcall div16x16 ; xA/xB=xC with xA as remainder
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34 movff xC+0,hi ; Hours
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35 movff xA+0,lo ; =remaining minutes (0.....59)
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36 return
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37
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38 div16:
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39 ; divA=divA/2^divB (divB: 8Bit only!)
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40 bcf STATUS,C
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41 rrcf divA+1
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42 rrcf divA
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43 decfsz divB
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44 bra div16
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45 return
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46
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47 sub16: ; sub_c = sub_a - sub_b (with signed values)
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48 bcf neg_flag
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49 movf sub_b+0, W ; Get Value to be subtracted
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50 subwf sub_a+0, W ; Do the High Byte
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51 movwf sub_c+0
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52 movf sub_b+1, W ; Get the Value to be Subbed
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53 subwfb sub_a+1, W
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54 movwf sub_c+1
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55
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56 btfss STATUS,N ; Negativ result ?
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57 return ; NO: result positive done.
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58
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59 bsf neg_flag ; MARK result negative
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60
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61 comf sub_c+1 ; 16bit sign change.
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62 negf sub_c+0
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63 btfsc STATUS,C ; Carry to propagate ?
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64 incf sub_c+1,F ; YES: do it.
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65
0
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66 return
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67
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68 subU16: ; sub_c = sub_a - sub_b (with UNSIGNED values)
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69 bcf neg_flag
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70 movf sub_b+0, W ; Get Value to be subtracted
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71 subwf sub_a+0, W ; Do the High Byte
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72 movwf sub_c+0
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73 movf sub_b+1, W ; Get the Value to be Subbed
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74 subwfb sub_a+1, W
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75 movwf sub_c+1
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76
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77 btfsc STATUS,C ; Borrow to propagate ? (B == /CARRY)
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78 return ; NO: result positive done.
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79
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80 bsf neg_flag ; MARK result negative
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81
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82 comf sub_c+1 ; 16bit sign change.
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83 negf sub_c+0
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84 btfsc STATUS,C ; Carry to propagate ?
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85 incf sub_c+1,F ; YES: do it.
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86
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87 return
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88
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89 ;=============================================================================
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90
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91 mult16x16: ;xA*xB=xC
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92 clrf xC+2 ; Clear the High-Order Bits
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93 clrf xC+3
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94 movf xA, w ; Do the "L" Multiplication first
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95 mulwf xB
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96 movf PRODL, w ; Save result
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97 movwf xC
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98 movf PRODH, w
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99 movwf xC+1
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100 movf xA, w ; Do the "I" Multiplication
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101 mulwf xB+1
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102 movf PRODL, w ; Save the Most Significant Byte First
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103 addwf xC+1, f
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104 movf PRODH, w
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105 addwfc xC+2, f ; Add to the Last Result
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106 movf xA+1, w ; Do the "O" Multiplication
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107 mulwf xB
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108 movf PRODL, w ; Add the Lower Byte Next
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109 addwf xC+1, f
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110 movf PRODH, w ; Add the High Byte First
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111 addwfc xC+2, f
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112 btfsc STATUS, C ; Add the Carry
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113 incf xC+3, f
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114 movf xA+1, w ; Do the "F" Multiplication
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115 mulwf xB+1
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116 movf PRODL, w
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117 addwf xC+2, f
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118 movf PRODH, w
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119 addwfc xC+3, f
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120 return
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121
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122 ;=============================================================================
0
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123
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124 div16x16: ;xA/xB=xC with xA as remainder
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125 ;uses divB as temp variable
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126 clrf xC+0
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127 clrf xC+1
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128 MOVF xB+0,W ; Check for zero
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129 IORWF xB+1,W ;
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130 BTFSC STATUS,Z ; Check for zero
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131 RETLW H'FF' ; return 0xFF if illegal
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132 MOVLW 1 ; Start count at 1
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133 MOVWF divB ; Clear Count
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134 div16x16_1
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135 BTFSC xB+1,7 ; High bit set ?
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136 bra div16x16_2 ; Yes then continue
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137 INCF divB,F ; Increment count
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138
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139 bcf STATUS,C
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140 rlcf xB+0,F
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141 rlcf xB+1,F
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142 bra div16x16_1
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143 div16x16_2:
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144 ; Shift result left
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145 bcf STATUS,C
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146 rlcf xC+0,F
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147 rlcf xC+1,F
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148
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149 ; Reduce Divisor
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150
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151 MOVF xB,W ; Get low byte of subtrahend
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152 SUBWF xA,F ; Subtract DST(low) - SRC(low)
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153 MOVF xB+1,W ; Now get high byte of subtrahend
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154 BTFSS STATUS,C ; If there was a borrow, rather than
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155 INCF xB+1,W ; decrement high byte of dst we inc src
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156 SUBWF xA+1,F ; Subtract the high byte and we're done
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157
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158
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159 BTFSC STATUS, C ; Did it reduce?
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160 bra div16x16_3 ; No, so it was less than
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161
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162 movf xB+0,W ; Reverse subtraction
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163 addwf xA+0,F
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164 movf xB+1,W
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165 addwfc xA+1,F
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166
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167 bra div16x16_4 ; Continue the process
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168 div16x16_3:
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169 BSF xC+0,0 ; Yes it did, this gets a 1 bit
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170 div16x16_4:
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171 DECF divB,F ; Decrement N_COUNT
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172 BTFSC STATUS,Z ; If its not zero then continue
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173 return
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174
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175 bcf STATUS,C
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176 rrcf xB+1,F
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177 rrcf xB+0,F
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178
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179 bra div16x16_2 ; Next bit.
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180
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181 ;=============================================================================
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182
0
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183 div32x16: ; xC:4 / xB:2 = xC+3:xC+2 with xC+1:xC+0 as remainder
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184 ; Setup
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185 movlw .32 ; setup shift counter
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186 movwf divB
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187 movf xC+3,W ; move ACCb to ACCf
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188 movwf xA+1
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189 movf xC+2,W
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190 movwf xA+0
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191 movf xC+1,W ; move ACCc to ACCe
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192 movwf sub_a+1
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193 movf xC+0,W
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194 movwf sub_a+0
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195 clrf xC+3
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196 clrf xC+2
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197 clrf xC+1
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198 clrf xC+0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
199 clrf sub_b+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
200 clrf sub_b+0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
201 div32x16_2
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
202 bcf STATUS,C
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
203 rlcf sub_a+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
204 rlcf sub_a+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
205 rlcf xA+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
206 rlcf xA+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
207 rlcf sub_b+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
208 rlcf sub_b+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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209 movf xB+1,W
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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210 subwf sub_b+1,W ; check if a>d
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
211 btfss STATUS,Z
476
7779bfa89171 Cave bailout prediction.
JeanDo
parents: 426
diff changeset
212 bra div32x16_3
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
213 movf xB+0,W
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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214 subwf sub_b+0,W ; if msb equal then check lsb
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
215 div32x16_3
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
216 btfss STATUS,C ; carry set if d>a
476
7779bfa89171 Cave bailout prediction.
JeanDo
parents: 426
diff changeset
217 bra div32x16_4
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
218 movf xB+0,W ; d-a into d
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
219 subwf sub_b+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
220 btfss STATUS,C
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
221 decf sub_b+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
222 movf xB+1,W
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
223 subwf sub_b+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
224 bsf STATUS,C ; shift a 1 into b (result)
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
225 div32x16_4
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
226 rlcf xC+0,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
227 rlcf xC+1,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
228 rlcf xC+2,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
229 rlcf xC+3,F
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
230 decfsz divB,F ; loop until all bits checked
476
7779bfa89171 Cave bailout prediction.
JeanDo
parents: 426
diff changeset
231 bra div32x16_2
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
232 return
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
233
161
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
234 ;=============================================================================
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
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235 ; u16 * u16 --> 32bit multiply (xA * xB --> xC)
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
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236 ; Used in interupt service routines, to compute temperature and pressure.
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
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diff changeset
237 ;
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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238 isr_mult16x16:
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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239 clrf isr_xC+2 ; Clear the High-Order Bits
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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240 clrf isr_xC+3
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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241 movf isr_xA, w ; Do the "L" Multiplication first
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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242 mulwf isr_xB
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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243 movf PRODL, w ; Save result
161
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
244 movwf isr_xC+0
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
245 movf PRODH, w
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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246 movwf isr_xC+1
161
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
247 movf isr_xA+0, w ; Do the "I" Multiplication
0
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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248 mulwf isr_xB+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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249 movf PRODL, w ; Save the Most Significant Byte First
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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250 addwf isr_xC+1, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
251 movf PRODH, w
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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252 addwfc isr_xC+2, f ; Add to the Last Result
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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253 movf isr_xA+1, w ; Do the "O" Multiplication
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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254 mulwf isr_xB
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
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255 movf PRODL, w ; Add the Lower Byte Next
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
256 addwf isr_xC+1, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
257 movf PRODH, w ; Add the High Byte First
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
258 addwfc isr_xC+2, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
259 btfsc STATUS, C ; Add the Carry
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
260 incf isr_xC+3, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
261 movf isr_xA+1, w ; Do the "F" Multiplication
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
262 mulwf isr_xB+1
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
263 movf PRODL, w
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
264 addwf isr_xC+2, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
265 movf PRODH, w
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
266 addwfc isr_xC+3, f
96a35aeda5f2 Initial setup
heinrichsweikamp
parents:
diff changeset
267 return
161
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
268
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
269 ;=============================================================================
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
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diff changeset
270 ; 24bit shift, repeted WREG times.
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
271 ; Because we shift less than 8bits, and keep only C[2:1], we don't care what
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
272 ; bit is inserted...
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
273 ;
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
274 isr_shift_C31:
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
275 rrcf isr_xC+3,F ; Shift the three bytes...
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
276 rrcf isr_xC+2,F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
277 rrcf isr_xC+1,F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
278 decfsz WREG
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
279 bra isr_shift_C31
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
280 return
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
281
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
282 ;=============================================================================
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
283 ; s16 * s16 --> 32bit multiply (xA * xB --> xC)
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
284 ; Signed multiplication.
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
285 ; Code from... the Pic18F documentation ;-)
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
286 isr_unsigned_mult16x16:
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
287 MOVF isr_xA+0, W ; Lowest is simply a[0] * b[0]
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
288 MULWF isr_xB+0
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
289 MOVFF PRODL, isr_xC+0
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
290 MOVFF PRODH, isr_xC+1
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
291 ;
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
292 MOVF isr_xA+1, W ; And highest a[1] * b[1]
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
293 MULWF isr_xB+1
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
294 MOVFF PRODL, isr_xC+2
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
295 MOVFF PRODH, isr_xC+3
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
296 ;
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
297 MOVF isr_xA+0, W ; Intermediates do propagate:
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
298 MULWF isr_xB+1
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
299 MOVF PRODL, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
300 ADDWF isr_xC+1, F ; Add cross products
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
301 MOVF PRODH, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
302 ADDWFC isr_xC+2, F ; with propagated carry
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
303 CLRF WREG
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
304 ADDWFC isr_xC+3, F ; on the three bytes.
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
305 ;
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
306 MOVF isr_xA+1, W ; And the second one, similarly.
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
307 MULWF isr_xB+0
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
308 MOVF PRODL, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
309 ADDWF isr_xC+1, F ; Add cross products
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
310 MOVF PRODH, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
311 ADDWFC isr_xC+2, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
312 CLRF WREG
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
313 ADDWFC isr_xC+3, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
314 return
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
315
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
316 isr_signed_mult16x16:
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
317 rcall isr_unsigned_mult16x16
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
318
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
319 ; Manage sign extension of operand B
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
320 BTFSS isr_xB+1,7 ; Is B negatif ?
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
321 BRA isr_signed_mult_checkA ; No: check ARG1
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
322 MOVF isr_xA+0, W ; Yes: add -65536 * A
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
323 SUBWF isr_xC+2, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
324 MOVF isr_xA+1, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
325 SUBWFB isr_xC+3, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
326 ; And of operand A
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
327 isr_signed_mult_checkA
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
328 BTFSS isr_xA+1, 7 ; Is A negatif ?
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
329 RETURN ; No: done
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
330 MOVF isr_xB+0, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
331 SUBWF isr_xC+2, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
332 MOVF isr_xB+1, W
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
333 SUBWFB isr_xC+3, F
8d6aca08f66b Use signed arithmetic for pressure/temperature compensation.
JeanDo
parents: 105
diff changeset
334 RETURN