Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/ms5535.asm @ 173:4a7a778d9e49
CF09 limits
author | heinrichsweikamp |
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date | Wed, 02 Feb 2011 11:09:39 +0100 |
parents | e26f49674956 |
children | 6d8a2550c9ea |
rev | line source |
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0 | 1 ; OSTC - diving computer code |
2 ; Copyright (C) 2008 HeinrichsWeikamp GbR | |
3 | |
4 ; This program is free software: you can redistribute it and/or modify | |
5 ; it under the terms of the GNU General Public License as published by | |
6 ; the Free Software Foundation, either version 3 of the License, or | |
7 ; (at your option) any later version. | |
8 | |
9 ; This program is distributed in the hope that it will be useful, | |
10 ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 ; GNU General Public License for more details. | |
13 | |
14 ; You should have received a copy of the GNU General Public License | |
15 ; along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | |
17 | |
18 ; routines for Intersema MS5535A, MS5541B and MS5541C | |
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19 ; history: |
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20 ; 2005-09-26: Written by Matthias Heinrichs, info@heinrichsweikamp.com |
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21 ; 2008-08-21: MH last updated, with second order compensation. |
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22 ; 2011-01-19: jDG Clean up using true signed arithmetics. |
0 | 23 ; known bugs: |
24 ; ToDo: | |
25 | |
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26 ;============================================================================= |
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27 ; Expose internal variables, to ease debug: |
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28 global D1, D2 |
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29 global C1, C2, C3, C4, C5 |
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30 global xdT, xdT2, OFF, SENS, amb_pressure |
0 | 31 |
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32 ;============================================================================= |
0 | 33 calculate_compensation: |
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34 ; calculate UT1 = 8*C5 + 10000 (u16 range 10.000 .. +42.760) |
0 | 35 clrf isr_xA+1 |
36 movlw d'8' | |
37 movwf isr_xA+0 | |
38 movff C5+0,isr_xB+0 | |
39 movff C5+1,isr_xB+1 | |
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40 call isr_unsigned_mult16x16 ;isr_xA*isr_xB=isr_xC |
0 | 41 movlw LOW d'10000' |
42 addwf isr_xC+0, f | |
43 movlw HIGH d'10000' | |
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44 addwfc isr_xC+1, f ;isr_xC= 8*C5 + 10000 |
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45 |
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46 ; xdT = D2 - UT1 (s16 range -11.400 .. +12.350) |
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47 movf isr_xC+0,W ; Get Value to be subtracted |
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48 subwf D2+0,W ; Do the Low Byte |
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49 movwf xdT+0 |
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50 movf isr_xC+1,W ; Then the high byte. |
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51 subwfb D2+1,W |
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52 movwf xdT+1 |
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53 |
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54 ; Second order temperature calculation |
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55 ; xdT/128 is in range -89..+96, hence signed 8bit. dT/128 = (2*dT)/256 |
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56 rlcf xdT+0,W ; put hit bit in carry. |
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57 rlcf xdT+1,W ; inject in high byte. |
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58 movwf isr_xA+0 ; and put result in low byte. |
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59 clrf isr_xA+1 |
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60 btfsc xdT+1,7 ; If dT < 0 |
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61 setf isr_xA+1 ; then signextend to -1 |
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62 movff isr_xA+0,isr_xB+0 ; copy A to B |
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63 movff isr_xA+1,isr_xB+1 |
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64 call isr_signed_mult16x16 ; dT*dT --> xC (32 bits) |
0 | 65 |
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66 ; dT >= 0: divide by 8, ie. 3 shifts rights. |
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67 ; dT < 0: divide by 2, ie. 1 shifts rights. |
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68 movlw .3 |
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69 btfss xdT+1,7 ; Was dT negatif ? |
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70 movlw .1 |
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71 calc_loop_1: |
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72 bcf STATUS,C ;dT^2 is positiv, so injected zeros. |
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73 rrcf isr_xC+1,F |
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74 rrcf isr_xC+0,F |
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75 decfsz WREG |
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76 bra calc_loop_1 |
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77 |
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78 movf isr_xC+0,W ; dT2 = dT - (dT/128)*(dT/128)/(2 ...or... 8) |
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79 subwf xdT+0,W |
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80 movwf xdT2+0 |
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81 movf isr_xC+1,W |
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82 subwfb xdT+1,W |
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83 movwf xdT2+1 |
0 | 84 |
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85 ; Calculate OFF = C2 + ((C4-250)*dT2)/2^12 + 10000 |
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86 ; (range +9.246 .. +18.887) |
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87 movlw LOW(-.250) ; C4 - 250 --> A |
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88 addwf C4+0,W |
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89 movwf isr_xA+0 |
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90 movlw -1 ; HIGH(- .250) is not hunderstood... |
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91 addwfc C4+1,W |
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92 movwf isr_xA+1 |
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93 |
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94 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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95 movff xdT2+1,isr_xB+1 |
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96 call isr_signed_mult16x16 |
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97 movlw .12-.8 ; A 12bit shift = 1 byte + 4 bits. |
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98 call isr_shift_C31 |
0 | 99 |
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100 movlw LOW(.10000) ; Add 10000 |
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101 addwf isr_xC+1,F |
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102 movlw HIGH(.10000) |
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103 addwfc isr_xC+2,F |
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104 |
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105 movf C2+0,W ; Add C2, and save into OFF |
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106 addwf isr_xC+1,W |
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107 movwf OFF+0 |
0 | 108 movf C2+1,W |
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109 addwfc isr_xC+2,W |
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110 movwf OFF+1 |
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111 |
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112 ; Calculate SENS = C1/2 + ((C3+200)*dT)/2^13 + 3000 |
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113 movlw LOW(.200) ; C3+200 --> A |
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114 addwf C3+0,W |
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115 movwf isr_xA+0 |
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116 movlw HIGH(.200) |
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117 addwfc C3+1,W |
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118 movwf isr_xA+1 |
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119 ; B still contains dT2 |
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120 call isr_signed_mult16x16 ; A*B --> C |
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121 movlw .13-.8 ; A 13bit shift = 1 byte + 5 bits. |
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122 call isr_shift_C31 |
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123 |
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124 bcf STATUS,C ; SENS = C1 / 2 |
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125 rrcf C1+1,W |
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126 movwf SENS+1 |
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127 rrcf C1+0,W |
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128 movwf SENS+0 |
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129 |
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130 movlw LOW(.3000) ; Add 3000 |
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131 addwf isr_xC+1,F |
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132 movlw HIGH(.3000) |
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133 addwfc isr_xC+2,F |
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135 movf isr_xC+1,W ; And sum into SENS |
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136 addwf SENS+0,F |
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137 movf isr_xC+2,W |
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138 addwfc SENS+1,F |
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139 |
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140 ; calculate amb_pressure = (sens * (d1-off))/2^12 + 1000 |
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141 movf OFF+0,W ; d1-off --> a |
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142 subwf D1+0,W |
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143 movwf isr_xA+0 |
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144 movf OFF+1,W |
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145 subwfb D1+1,W |
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146 movwf isr_xA+1 |
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148 movff SENS+0,isr_xB+0 ; sens --> b |
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149 movff SENS+1,isr_xB+1 |
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150 call isr_signed_mult16x16 |
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151 movlw .12-.8 ; a 12bit shift = 1 byte + 4 bits. |
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152 call isr_shift_C31 |
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153 |
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154 movlw LOW(.1000) ; add 1000, and save into amb_pressure |
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155 addwf isr_xC+1,W |
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156 movwf amb_pressure+0 |
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157 movlw HIGH(.1000) |
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158 addwfc isr_xC+2,W |
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159 movwf amb_pressure+1 |
0 | 160 |
161 btfss simulatormode_active ; are we in simulator mode? | |
162 bra calc_pressure_done ; no | |
163 | |
164 movff sim_pressure+0,amb_pressure+0 ; override readings with simulator values | |
165 movff sim_pressure+1,amb_pressure+1 | |
166 | |
167 calc_pressure_done: | |
161
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168 ; calculate temp = 200 + dT*(C6+100)/2^11 |
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169 movlw LOW(.100) ; C6 + 100 --> A |
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170 addwf C6+0,W |
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171 movwf isr_xA+0 |
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172 movlw HIGH(.100) |
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173 addwfc C6+1,W |
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174 movwf isr_xA+1 |
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176 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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177 movff xdT2+1,isr_xB+1 |
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178 call isr_signed_mult16x16 ; A*B |
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179 movlw .11-.8 ; A 12bit shift = 1 byte + 3 bits. |
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180 call isr_shift_C31 |
0 | 181 |
161
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182 movlw LOW(.200) ; Add 200, and save into temperature |
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183 addwf isr_xC+1,W |
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184 movwf temperature+0 |
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185 movlw HIGH(.200) |
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186 addwfc isr_xC+2,W |
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187 movwf temperature+1 |
0 | 188 |
161
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189 bcf neg_temp |
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190 bnn calc_pos_temp ; Is Temp° negativ ? |
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191 |
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192 bsf neg_temp ; Yes: set flag and store -temp |
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193 comf temperature+1 |
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194 negf temperature+0 |
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195 btfsc STATUS,C |
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196 incf temperature+1 |
0 | 197 |
161
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198 calc_pos_temp: |
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199 return ; Fertig mit allem |
0 | 200 |
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201 ;============================================================================= |
0 | 202 get_pressure_start: |
203 rcall reset_MS5535A | |
204 movlw b'10100000' ;+3*high as start and 1+low as stop! | |
205 get_pressure_start2: | |
206 movwf isr1_temp | |
207 movlw d'12' | |
208 movwf clock_count | |
209 rcall send_data_MS55535A | |
210 return | |
211 | |
212 get_pressure_value: | |
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213 #ifndef TESTING |
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214 ; Use register injection instead when in MPLab Sim emulation... |
0 | 215 rcall get_2bytes_MS5535A |
216 movff dMSB,D1+1 | |
217 movff dLSB,D1+0 | |
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218 #endif |
0 | 219 return |
220 | |
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221 ;============================================================================= |
0 | 222 get_temperature_start: |
223 rcall reset_MS5535A | |
224 movlw b'10010000' ;+3*high as start and 1+low as stop! | |
225 bra get_pressure_start2 ; continue in "get_pressure" | |
226 | |
227 get_temperature_value: | |
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228 #ifndef TESTING |
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229 ; Use register injection instead... |
0 | 230 rcall get_2bytes_MS5535A |
231 movff dMSB,D2+1 | |
232 movff dLSB,D2+0 | |
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233 #endif |
0 | 234 return |
235 | |
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236 ;============================================================================= |
0 | 237 get_calibration_data: |
238 rcall reset_MS5535A | |
239 movlw d'13' | |
240 movwf clock_count | |
241 movlw b'01010100' ;+3*high as start and 1+low as stop! | |
242 movwf isr1_temp | |
243 rcall send_data_MS55535A | |
244 rcall get_2bytes_MS5535A | |
245 movff dMSB,W1+1 | |
246 movff dLSB,W1+0 | |
247 | |
248 movlw d'13' | |
249 movwf clock_count | |
250 movlw b'01011000' ;+3*high as start and 1+low as stop! | |
251 movwf isr1_temp | |
252 rcall send_data_MS55535A | |
253 rcall get_2bytes_MS5535A | |
254 movff dMSB,W2+1 | |
255 movff dLSB,W2+0 | |
256 | |
257 movlw d'13' | |
258 movwf clock_count | |
259 movlw b'01100100' ;+3*high as start and 1+low as stop! | |
260 movwf isr1_temp | |
261 rcall send_data_MS55535A | |
262 rcall get_2bytes_MS5535A | |
263 movff dMSB,W3+1 | |
264 movff dLSB,W3+0 | |
265 | |
266 movlw d'13' | |
267 movwf clock_count | |
268 movlw b'01101000' ;+3*high as start and 1+low as stop! | |
269 movwf isr1_temp | |
270 rcall send_data_MS55535A | |
271 rcall get_2bytes_MS5535A | |
272 movff dMSB,W4+1 | |
273 movff dLSB,W4+0 | |
274 | |
275 ; calculate C1 (16Bit) | |
276 movff W1+1, C1+1 | |
277 bcf STATUS,C | |
278 rrcf C1+1 | |
279 bcf STATUS,C | |
280 rrcf C1+1 | |
281 bcf STATUS,C | |
282 rrcf C1+1 | |
283 movff W1+0, C1+0 | |
284 bsf STATUS,C | |
285 btfss W1+1,0 | |
286 bcf STATUS,C | |
287 rrcf C1+0 | |
288 bsf STATUS,C | |
289 btfss W1+1,1 | |
290 bcf STATUS,C | |
291 rrcf C1+0 | |
292 bsf STATUS,C | |
293 btfss W1+1,2 | |
294 bcf STATUS,C | |
295 rrcf C1+0 | |
296 | |
297 ; calculate C2 (16Bit) | |
298 movff W2+0, C2+0 | |
299 bsf STATUS,C | |
300 btfss W2+1,0 | |
301 bcf STATUS,C | |
302 rrcf C2+0 | |
303 bsf STATUS,C | |
304 btfss W2+1,1 | |
305 bcf STATUS,C | |
306 rrcf C2+0 | |
307 bsf STATUS,C | |
308 btfss W2+1,2 | |
309 bcf STATUS,C | |
310 rrcf C2+0 | |
311 bsf STATUS,C | |
312 btfss W2+1,3 | |
313 bcf STATUS,C | |
314 rrcf C2+0 | |
315 bsf STATUS,C | |
316 btfss W2+1,4 | |
317 bcf STATUS,C | |
318 rrcf C2+0 | |
319 bsf STATUS,C | |
320 btfss W2+1,5 | |
321 bcf STATUS,C | |
322 rrcf C2+0 | |
323 | |
324 movff W2+1, C2+1 | |
325 bsf STATUS,C | |
326 btfss W1+0,0 | |
327 bcf STATUS,C | |
328 rrcf C2+1 | |
329 bsf STATUS,C | |
330 btfss W1+0,1 | |
331 bcf STATUS,C | |
332 rrcf C2+1 | |
333 bsf STATUS,C | |
334 btfss W1+0,2 | |
335 bcf STATUS,C | |
336 rrcf C2+1 | |
337 bcf STATUS,C | |
338 rrcf C2+1 | |
339 bcf STATUS,C | |
340 rrcf C2+1 | |
341 bcf STATUS,C | |
342 rrcf C2+1 | |
343 | |
344 ; calculate C3 (16Bit) | |
345 movff W3+1,C3+0 | |
346 bsf STATUS,C | |
347 btfss W3+0,7 | |
348 bcf STATUS,C | |
349 rlcf C3+0 | |
350 bsf STATUS,C | |
351 btfss W3+0,6 | |
352 bcf STATUS,C | |
353 rlcf C3+0 | |
354 clrf C3+1 | |
355 btfsc W3+1,7 | |
356 bsf C3+1,1 | |
357 btfsc W3+1,6 | |
358 bsf C3+1,0 | |
359 | |
360 ; calculate C4 (16Bit) | |
361 movff W4+1,C4+0 | |
362 bsf STATUS,C | |
363 btfss W4+0,7 | |
364 bcf STATUS,C | |
365 rlcf C4+0 | |
366 clrf C4+1 | |
367 btfsc W4+1,7 | |
368 bsf C4+1,0 | |
369 | |
370 ; calculate C5 (16Bit) | |
371 movff W3+0,C5+0 | |
372 bcf C5+0,6 | |
373 btfsc W2+0,0 | |
374 bsf C5+0,6 | |
375 bcf C5+0,7 | |
376 btfsc W2+0,1 | |
377 bsf C5+0,7 | |
378 clrf C5+1 | |
379 btfsc W2+0,2 | |
380 bsf C5+1,0 | |
381 btfsc W2+0,3 | |
382 bsf C5+1,1 | |
383 btfsc W2+0,4 | |
384 bsf C5+1,2 | |
385 btfsc W2+0,5 | |
386 bsf C5+1,3 | |
387 | |
388 ; calculate C6 (16Bit) | |
389 clrf C6+1 | |
390 movff W4+0,C6+0 | |
391 bcf C6+0,7 | |
392 | |
393 bcf no_sensor_int ; enable sensor interrupts | |
394 return | |
395 | |
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396 ;============================================================================= |
0 | 397 reset_MS5535A_one: |
398 bsf sensor_SDO | |
399 nop | |
400 bsf sensor_CLK | |
401 nop | |
402 nop | |
403 nop | |
404 nop | |
405 nop | |
406 nop | |
407 bcf sensor_CLK | |
408 return | |
409 | |
410 reset_MS5535A_zero: | |
411 bcf sensor_SDO | |
412 nop | |
413 bsf sensor_CLK | |
414 nop | |
415 nop | |
416 nop | |
417 nop | |
418 nop | |
419 nop | |
420 bcf sensor_CLK | |
421 return | |
422 | |
423 reset_MS5535A: | |
424 rcall reset_MS5535A_one ;0 | |
425 rcall reset_MS5535A_zero | |
426 rcall reset_MS5535A_one | |
427 rcall reset_MS5535A_zero | |
428 rcall reset_MS5535A_one | |
429 rcall reset_MS5535A_zero | |
430 rcall reset_MS5535A_one | |
431 rcall reset_MS5535A_zero | |
432 rcall reset_MS5535A_one | |
433 rcall reset_MS5535A_zero | |
434 rcall reset_MS5535A_one | |
435 rcall reset_MS5535A_zero | |
436 rcall reset_MS5535A_one | |
437 rcall reset_MS5535A_zero | |
438 rcall reset_MS5535A_one | |
439 rcall reset_MS5535A_zero ;15 | |
440 rcall reset_MS5535A_zero | |
441 rcall reset_MS5535A_zero | |
442 rcall reset_MS5535A_zero | |
443 rcall reset_MS5535A_zero | |
444 rcall reset_MS5535A_zero ;20 | |
445 return | |
446 | |
447 get_2bytes_MS5535A: | |
448 movlw d'8' | |
449 movwf clock_count | |
450 rcall recieve_loop | |
451 movff isr1_temp,dMSB | |
452 | |
453 movlw d'8' | |
454 movwf clock_count | |
455 rcall recieve_loop | |
456 movff isr1_temp,dLSB | |
457 bsf sensor_CLK | |
458 nop | |
459 nop | |
460 nop | |
461 nop | |
462 nop | |
463 nop | |
464 bcf sensor_CLK | |
465 return | |
466 | |
467 recieve_loop: | |
468 bsf sensor_CLK | |
469 nop | |
470 nop | |
471 nop | |
472 nop | |
473 nop | |
474 nop | |
475 bcf sensor_CLK | |
476 btfss sensor_SDI ;MSB first | |
477 bcf STATUS,C | |
478 btfsc sensor_SDI ;MSB first | |
479 bsf STATUS,C | |
480 rlcf isr1_temp,F | |
481 decfsz clock_count,F | |
482 bra recieve_loop | |
483 return | |
484 | |
485 send_data_MS55535A: | |
486 ; send three startbits first | |
487 bcf sensor_CLK | |
488 bsf sensor_SDO | |
489 movlw d'3' | |
490 subwf clock_count,F ; total bit counter | |
491 bsf sensor_CLK | |
492 nop | |
493 nop | |
494 nop | |
495 nop | |
496 nop | |
497 nop | |
498 bcf sensor_CLK | |
499 nop | |
500 nop | |
501 nop | |
502 nop | |
503 nop | |
504 nop | |
505 bsf sensor_CLK | |
506 nop | |
507 nop | |
508 nop | |
509 nop | |
510 nop | |
511 nop | |
512 bcf sensor_CLK | |
513 nop | |
514 nop | |
515 nop | |
516 nop | |
517 nop | |
518 nop | |
519 bsf sensor_CLK | |
520 nop | |
521 nop | |
522 nop | |
523 nop | |
524 nop | |
525 nop | |
526 bcf sensor_CLK | |
527 ; now send 8 bytes from isr_temp1 and fill-up with zeros | |
528 datenbits: | |
529 btfss isr1_temp,7 ;MSB first | |
530 bcf sensor_SDO | |
531 btfsc isr1_temp,7 ;MSB first | |
532 bsf sensor_SDO | |
533 bcf STATUS,C | |
534 rlcf isr1_temp | |
535 | |
536 bsf sensor_CLK | |
537 nop | |
538 nop | |
539 nop | |
540 nop | |
541 nop | |
542 nop | |
543 bcf sensor_CLK | |
544 | |
545 decfsz clock_count,F | |
546 bra datenbits | |
547 return |