Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/ms5535.asm @ 704:422b9eeace4f
minor
| author | heinrichsweikamp |
|---|---|
| date | Fri, 29 Mar 2013 20:53:41 +0100 |
| parents | f53aa96ff2f4 |
| children | b7f7184d800d |
| rev | line source |
|---|---|
| 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. |
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23 ; 2011-05-19: jDG Avegaring temperature and amb_pressure in private variable, |
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24 ; Use signed 16bit value for temperature (compat with avg !). |
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25 ; |
| 0 | 26 ; known bugs: |
| 27 ; ToDo: | |
| 28 | |
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29 ;============================================================================= |
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30 ; Expose internal variables, to ease debug: |
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31 global D1, D2 |
| 289 | 32 global C1, C2, C3, C4, C5, C6 |
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33 global xdT, xdT2, OFF, SENS, amb_pressure_avg, temperature_avg |
| 0 | 34 |
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35 ;============================================================================= |
| 0 | 36 calculate_compensation: |
| 704 | 37 ; xdT = D2 - C5 (s16 range -11.400 .. +12.350) |
| 38 movf C5+0,W ; Get Value to be subtracted | |
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39 subwf D2+0,W ; Do the Low Byte |
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40 movwf xdT+0 |
| 704 | 41 movf C5+1,W ; Then the high byte. |
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42 subwfb D2+1,W |
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43 movwf xdT+1 |
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44 |
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45 ; Second order temperature calculation |
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46 ; xdT/128 is in range -89..+96, hence signed 8bit. dT/128 = (2*dT)/256 |
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47 rlcf xdT+0,W ; put hit bit in carry. |
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48 rlcf xdT+1,W ; inject in high byte. |
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49 movwf isr_xA+0 ; and put result in low byte. |
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50 clrf isr_xA+1 |
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51 btfsc xdT+1,7 ; If dT < 0 |
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52 setf isr_xA+1 ; then signextend to -1 |
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53 movff isr_xA+0,isr_xB+0 ; copy A to B |
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54 movff isr_xA+1,isr_xB+1 |
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55 call isr_signed_mult16x16 ; dT*dT --> xC (32 bits) |
| 0 | 56 |
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57 ; dT >= 0: divide by 8, ie. 3 shifts rights. |
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58 ; dT < 0: divide by 2, ie. 1 shifts rights. |
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59 movlw .3 |
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60 btfss xdT+1,7 ; Was dT negatif ? |
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61 movlw .1 |
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62 calc_loop_1: |
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63 bcf STATUS,C ;dT^2 is positiv, so injected zeros. |
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64 rrcf isr_xC+1,F |
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65 rrcf isr_xC+0,F |
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66 decfsz WREG |
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67 bra calc_loop_1 |
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68 |
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69 movf isr_xC+0,W ; dT2 = dT - (dT/128)*(dT/128)/(2 ...or... 8) |
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70 subwf xdT+0,W |
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71 movwf xdT2+0 |
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72 movf isr_xC+1,W |
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73 subwfb xdT+1,W |
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74 movwf xdT2+1 |
| 0 | 75 |
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76 ; Calculate OFF = C2 + ((C4-250)*dT2)/2^12 + 10000 |
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77 ; (range +9.246 .. +18.887) |
| 704 | 78 movff C4+0,isr_xA+0 |
| 79 movff C4+1,isr_xA+1 | |
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80 |
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81 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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82 movff xdT2+1,isr_xB+1 |
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83 call isr_signed_mult16x16 |
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84 movlw .12-.8 ; A 12bit shift = 1 byte + 4 bits. |
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85 call isr_shift_C31 |
| 0 | 86 |
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87 movlw LOW(.10000) ; Add 10000 |
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88 addwf isr_xC+1,F |
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89 movlw HIGH(.10000) |
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90 addwfc isr_xC+2,F |
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91 |
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92 movf C2+0,W ; Add C2, and save into OFF |
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93 addwf isr_xC+1,W |
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94 movwf OFF+0 |
| 0 | 95 movf C2+1,W |
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96 addwfc isr_xC+2,W |
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97 movwf OFF+1 |
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98 |
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99 ; Calculate SENS = C1/2 + ((C3+200)*dT)/2^13 + 3000 |
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100 movlw LOW(.200) ; C3+200 --> A |
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101 addwf C3+0,W |
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102 movwf isr_xA+0 |
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103 movlw HIGH(.200) |
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104 addwfc C3+1,W |
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105 movwf isr_xA+1 |
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106 ; B still contains dT2 |
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107 call isr_signed_mult16x16 ; A*B --> C |
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108 movlw .13-.8 ; A 13bit shift = 1 byte + 5 bits. |
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109 call isr_shift_C31 |
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110 |
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111 bcf STATUS,C ; SENS = C1 / 2 |
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112 rrcf C1+1,W |
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113 movwf SENS+1 |
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114 rrcf C1+0,W |
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115 movwf SENS+0 |
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116 |
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117 movlw LOW(.3000) ; Add 3000 |
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118 addwf isr_xC+1,F |
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119 movlw HIGH(.3000) |
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120 addwfc isr_xC+2,F |
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122 movf isr_xC+1,W ; And sum into SENS |
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123 addwf SENS+0,F |
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124 movf isr_xC+2,W |
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125 addwfc SENS+1,F |
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126 |
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127 ; calculate amb_pressure = (sens * (d1-off))/2^12 + 1000 |
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128 movf OFF+0,W ; d1-off --> a |
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129 subwf D1+0,W |
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130 movwf isr_xA+0 |
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131 movf OFF+1,W |
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132 subwfb D1+1,W |
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133 movwf isr_xA+1 |
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135 movff SENS+0,isr_xB+0 ; sens --> b |
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136 movff SENS+1,isr_xB+1 |
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137 call isr_signed_mult16x16 |
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138 movlw .12-.8 ; a 12bit shift = 1 byte + 4 bits. |
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139 call isr_shift_C31 |
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140 |
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141 movlw LOW(.1000) ; add 1000 |
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142 addwf isr_xC+1,F |
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143 movlw HIGH(.1000) |
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144 addwfc isr_xC+2,F |
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| 146 btfss simulatormode_active ; are we in simulator mode? | |
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147 bra calc_compensation_2 ; no |
| 0 | 148 |
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149 movff sim_pressure+0,isr_xC+1 ; override readings with simulator values |
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150 movff sim_pressure+1,isr_xC+2 |
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152 calc_compensation_2: |
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153 movf isr_xC+1,W ; Then sum_up to pressure averaging buffer. |
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154 addwf amb_pressure_avg+0,F |
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155 movf isr_xC+2,W |
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156 addwfc amb_pressure_avg+1,F |
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157 |
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158 ; calculate temp = 200 + dT*(C6+100)/2^11 |
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159 movlw LOW(.100) ; C6 + 100 --> A |
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160 addwf C6+0,W |
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161 movwf isr_xA+0 |
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162 movlw HIGH(.100) |
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163 addwfc C6+1,W |
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164 movwf isr_xA+1 |
| 0 | 165 |
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166 movff xdT2+0,isr_xB+0 ; dT2 --> B |
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167 movff xdT2+1,isr_xB+1 |
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168 call isr_signed_mult16x16 ; A*B |
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169 movlw .11-.8 ; A 12bit shift = 1 byte + 3 bits. |
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170 call isr_shift_C31 |
| 0 | 171 |
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172 movlw LOW(.200) ; Add 200 |
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173 addwf isr_xC+1,F |
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174 movlw HIGH(.200) |
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175 addwfc isr_xC+2,F |
| 0 | 176 |
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177 movf isr_xC+1,W |
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178 addwf temperature_avg+0,F |
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179 movf isr_xC+2,W |
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180 addwfc temperature_avg+1,F |
| 0 | 181 |
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182 return ; Fertig mit allem |
| 0 | 183 |
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184 ;============================================================================= |
| 0 | 185 get_pressure_start: |
| 186 rcall reset_MS5535A | |
| 187 movlw b'10100000' ;+3*high as start and 1+low as stop! | |
| 188 get_pressure_start2: | |
| 189 movwf isr1_temp | |
| 190 movlw d'12' | |
| 191 movwf clock_count | |
| 192 rcall send_data_MS55535A | |
| 193 return | |
| 194 | |
| 195 get_pressure_value: | |
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196 #ifndef TESTING |
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197 ; Use register injection instead when in MPLab Sim emulation... |
| 0 | 198 rcall get_2bytes_MS5535A |
| 199 movff dMSB,D1+1 | |
| 200 movff dLSB,D1+0 | |
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201 #endif |
| 0 | 202 return |
| 203 | |
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204 ;============================================================================= |
| 0 | 205 get_temperature_start: |
| 206 rcall reset_MS5535A | |
| 207 movlw b'10010000' ;+3*high as start and 1+low as stop! | |
| 208 bra get_pressure_start2 ; continue in "get_pressure" | |
| 209 | |
| 210 get_temperature_value: | |
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211 #ifndef TESTING |
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212 ; Use register injection instead... |
| 0 | 213 rcall get_2bytes_MS5535A |
| 214 movff dMSB,D2+1 | |
| 215 movff dLSB,D2+0 | |
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216 #endif |
| 0 | 217 return |
| 218 | |
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219 ;============================================================================= |
| 0 | 220 get_calibration_data: |
| 221 rcall reset_MS5535A | |
| 222 movlw d'13' | |
| 223 movwf clock_count | |
| 224 movlw b'01010100' ;+3*high as start and 1+low as stop! | |
| 225 movwf isr1_temp | |
| 226 rcall send_data_MS55535A | |
| 227 rcall get_2bytes_MS5535A | |
| 289 | 228 |
| 229 #ifdef TESTING | |
| 230 movlw LOW(.18556) | |
| 231 movff WREG,W1+0 | |
| 232 movlw HIGH(.18556) | |
| 233 movff WREG,W1+1 | |
| 234 #else | |
| 0 | 235 movff dMSB,W1+1 |
| 236 movff dLSB,W1+0 | |
| 289 | 237 #endif |
| 0 | 238 |
| 239 movlw d'13' | |
| 240 movwf clock_count | |
| 241 movlw b'01011000' ;+3*high as start and 1+low as stop! | |
| 242 movwf isr1_temp | |
| 243 rcall send_data_MS55535A | |
| 244 rcall get_2bytes_MS5535A | |
| 289 | 245 #ifdef TESTING |
| 246 movlw LOW(.49183) | |
| 247 movff WREG,W2+0 | |
| 248 movlw HIGH(.49183) | |
| 249 movff WREG,W2+1 | |
| 250 #else | |
| 0 | 251 movff dMSB,W2+1 |
| 252 movff dLSB,W2+0 | |
| 289 | 253 #endif |
| 0 | 254 |
| 255 movlw d'13' | |
| 256 movwf clock_count | |
| 257 movlw b'01100100' ;+3*high as start and 1+low as stop! | |
| 258 movwf isr1_temp | |
| 259 rcall send_data_MS55535A | |
| 260 rcall get_2bytes_MS5535A | |
| 289 | 261 #ifdef TESTING |
| 262 movlw LOW(.22354) | |
| 263 movff WREG,W3+0 | |
| 264 movlw HIGH(.22354) | |
| 265 movff WREG,W3+1 | |
| 266 #else | |
| 0 | 267 movff dMSB,W3+1 |
| 268 movff dLSB,W3+0 | |
| 289 | 269 #endif |
| 0 | 270 |
| 271 movlw d'13' | |
| 272 movwf clock_count | |
| 273 movlw b'01101000' ;+3*high as start and 1+low as stop! | |
| 274 movwf isr1_temp | |
| 275 rcall send_data_MS55535A | |
| 276 rcall get_2bytes_MS5535A | |
| 289 | 277 #ifdef TESTING |
| 278 movlw LOW(.28083) | |
| 279 movff WREG,W4+0 | |
| 280 movlw HIGH(.28083) | |
| 281 movff WREG,W4+1 | |
| 282 #else | |
| 0 | 283 movff dMSB,W4+1 |
| 284 movff dLSB,W4+0 | |
| 289 | 285 #endif |
| 0 | 286 |
| 287 ; calculate C1 (16Bit) | |
| 288 movff W1+1, C1+1 | |
| 289 bcf STATUS,C | |
| 290 rrcf C1+1 | |
| 291 bcf STATUS,C | |
| 292 rrcf C1+1 | |
| 293 bcf STATUS,C | |
| 294 rrcf C1+1 | |
| 295 movff W1+0, C1+0 | |
| 296 bsf STATUS,C | |
| 297 btfss W1+1,0 | |
| 298 bcf STATUS,C | |
| 299 rrcf C1+0 | |
| 300 bsf STATUS,C | |
| 301 btfss W1+1,1 | |
| 302 bcf STATUS,C | |
| 303 rrcf C1+0 | |
| 304 bsf STATUS,C | |
| 305 btfss W1+1,2 | |
| 306 bcf STATUS,C | |
| 307 rrcf C1+0 | |
| 308 | |
| 309 ; calculate C2 (16Bit) | |
| 310 movff W2+0, C2+0 | |
| 311 bsf STATUS,C | |
| 312 btfss W2+1,0 | |
| 313 bcf STATUS,C | |
| 314 rrcf C2+0 | |
| 315 bsf STATUS,C | |
| 316 btfss W2+1,1 | |
| 317 bcf STATUS,C | |
| 318 rrcf C2+0 | |
| 319 bsf STATUS,C | |
| 320 btfss W2+1,2 | |
| 321 bcf STATUS,C | |
| 322 rrcf C2+0 | |
| 323 bsf STATUS,C | |
| 324 btfss W2+1,3 | |
| 325 bcf STATUS,C | |
| 326 rrcf C2+0 | |
| 327 bsf STATUS,C | |
| 328 btfss W2+1,4 | |
| 329 bcf STATUS,C | |
| 330 rrcf C2+0 | |
| 331 bsf STATUS,C | |
| 332 btfss W2+1,5 | |
| 333 bcf STATUS,C | |
| 334 rrcf C2+0 | |
| 335 | |
| 336 movff W2+1, C2+1 | |
| 337 bsf STATUS,C | |
| 338 btfss W1+0,0 | |
| 339 bcf STATUS,C | |
| 340 rrcf C2+1 | |
| 341 bsf STATUS,C | |
| 342 btfss W1+0,1 | |
| 343 bcf STATUS,C | |
| 344 rrcf C2+1 | |
| 345 bsf STATUS,C | |
| 346 btfss W1+0,2 | |
| 347 bcf STATUS,C | |
| 348 rrcf C2+1 | |
| 349 bcf STATUS,C | |
| 350 rrcf C2+1 | |
| 351 bcf STATUS,C | |
| 352 rrcf C2+1 | |
| 353 bcf STATUS,C | |
| 354 rrcf C2+1 | |
| 355 | |
| 356 ; calculate C3 (16Bit) | |
| 357 movff W3+1,C3+0 | |
| 358 bsf STATUS,C | |
| 359 btfss W3+0,7 | |
| 360 bcf STATUS,C | |
| 361 rlcf C3+0 | |
| 362 bsf STATUS,C | |
| 363 btfss W3+0,6 | |
| 364 bcf STATUS,C | |
| 365 rlcf C3+0 | |
| 366 clrf C3+1 | |
| 367 btfsc W3+1,7 | |
| 368 bsf C3+1,1 | |
| 369 btfsc W3+1,6 | |
| 370 bsf C3+1,0 | |
| 371 | |
| 372 ; calculate C4 (16Bit) | |
| 373 movff W4+1,C4+0 | |
| 374 bsf STATUS,C | |
| 375 btfss W4+0,7 | |
| 376 bcf STATUS,C | |
| 377 rlcf C4+0 | |
| 378 clrf C4+1 | |
| 379 btfsc W4+1,7 | |
| 380 bsf C4+1,0 | |
| 704 | 381 |
| 382 ; C4=C4-250 | |
| 383 movlw LOW(-.250) ; C4 - 250 --> C4 | |
| 384 addwf C4+0,W | |
| 385 movwf C4+0 | |
| 386 movlw -1 ; HIGH(- .250) is not understood... | |
| 387 addwfc C4+1,W | |
| 388 movwf C4+1 | |
| 0 | 389 |
| 390 ; calculate C5 (16Bit) | |
| 391 movff W3+0,C5+0 | |
| 392 bcf C5+0,6 | |
| 393 btfsc W2+0,0 | |
| 394 bsf C5+0,6 | |
| 395 bcf C5+0,7 | |
| 396 btfsc W2+0,1 | |
| 397 bsf C5+0,7 | |
| 398 clrf C5+1 | |
| 399 btfsc W2+0,2 | |
| 400 bsf C5+1,0 | |
| 401 btfsc W2+0,3 | |
| 402 bsf C5+1,1 | |
| 403 btfsc W2+0,4 | |
| 404 bsf C5+1,2 | |
| 405 btfsc W2+0,5 | |
| 406 bsf C5+1,3 | |
| 407 | |
| 704 | 408 ; calculate C5 = UT1 |
| 409 ; C5 = 8*C5 + 10000 (u16 range 10.000 .. +42.760) | |
| 410 clrf isr_xA+1 | |
| 411 movlw d'8' | |
| 412 movwf isr_xA+0 | |
| 413 movff C5+0,isr_xB+0 | |
| 414 movff C5+1,isr_xB+1 | |
| 415 call isr_unsigned_mult16x16 ;isr_xA*isr_xB=isr_xC | |
| 416 movff isr_xC+0,C5+0 | |
| 417 movff isr_xC+1,C5+1 | |
| 418 movlw LOW d'10000' | |
| 419 addwf C5+0,F | |
| 420 movlw HIGH d'10000' | |
| 421 addwfc C5+1,F ; = 8*C5 + 10000 | |
| 422 | |
| 0 | 423 ; calculate C6 (16Bit) |
| 424 clrf C6+1 | |
| 425 movff W4+0,C6+0 | |
| 426 bcf C6+0,7 | |
| 427 | |
| 428 bcf no_sensor_int ; enable sensor interrupts | |
| 429 return | |
| 430 | |
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431 ;============================================================================= |
| 0 | 432 reset_MS5535A_one: |
| 433 bsf sensor_SDO | |
| 434 nop | |
| 435 bsf sensor_CLK | |
| 436 nop | |
| 437 nop | |
| 438 nop | |
| 439 nop | |
| 469 | 440 btfsc OSCCON,4 ; 32MHz Mode? |
| 441 rcall MS5535A_extra_wait ; Yes | |
| 0 | 442 bcf sensor_CLK |
| 443 return | |
| 444 | |
| 445 reset_MS5535A_zero: | |
| 446 bcf sensor_SDO | |
| 447 nop | |
| 448 bsf sensor_CLK | |
| 449 nop | |
| 450 nop | |
| 451 nop | |
| 452 nop | |
| 469 | 453 btfsc OSCCON,4 ; 32MHz Mode? |
| 454 rcall MS5535A_extra_wait ; Yes | |
| 0 | 455 bcf sensor_CLK |
| 456 return | |
| 457 | |
| 469 | 458 MS5535A_extra_wait: |
| 459 nop | |
| 460 nop | |
| 461 nop | |
| 462 nop | |
| 463 nop | |
| 464 return | |
| 465 | |
| 0 | 466 reset_MS5535A: |
| 467 rcall reset_MS5535A_one ;0 | |
| 468 rcall reset_MS5535A_zero | |
| 469 rcall reset_MS5535A_one | |
| 470 rcall reset_MS5535A_zero | |
| 471 rcall reset_MS5535A_one | |
| 472 rcall reset_MS5535A_zero | |
| 473 rcall reset_MS5535A_one | |
| 474 rcall reset_MS5535A_zero | |
| 475 rcall reset_MS5535A_one | |
| 476 rcall reset_MS5535A_zero | |
| 477 rcall reset_MS5535A_one | |
| 478 rcall reset_MS5535A_zero | |
| 479 rcall reset_MS5535A_one | |
| 480 rcall reset_MS5535A_zero | |
| 481 rcall reset_MS5535A_one | |
| 482 rcall reset_MS5535A_zero ;15 | |
| 483 rcall reset_MS5535A_zero | |
| 484 rcall reset_MS5535A_zero | |
| 485 rcall reset_MS5535A_zero | |
| 486 rcall reset_MS5535A_zero | |
| 487 rcall reset_MS5535A_zero ;20 | |
| 488 return | |
| 489 | |
| 490 get_2bytes_MS5535A: | |
| 491 movlw d'8' | |
| 492 movwf clock_count | |
| 493 rcall recieve_loop | |
| 494 movff isr1_temp,dMSB | |
| 495 | |
| 496 movlw d'8' | |
| 497 movwf clock_count | |
| 498 rcall recieve_loop | |
| 499 movff isr1_temp,dLSB | |
| 500 bsf sensor_CLK | |
| 501 nop | |
| 502 nop | |
| 503 nop | |
| 504 nop | |
| 469 | 505 btfsc OSCCON,4 ; 32MHz Mode? |
| 506 rcall MS5535A_extra_wait ; Yes | |
| 0 | 507 bcf sensor_CLK |
| 508 return | |
| 509 | |
| 510 recieve_loop: | |
| 511 bsf sensor_CLK | |
| 512 nop | |
| 513 nop | |
| 514 nop | |
| 515 nop | |
| 469 | 516 btfsc OSCCON,4 ; 32MHz Mode? |
| 517 rcall MS5535A_extra_wait ; Yes | |
| 0 | 518 bcf sensor_CLK |
| 519 btfss sensor_SDI ;MSB first | |
| 520 bcf STATUS,C | |
| 521 btfsc sensor_SDI ;MSB first | |
| 522 bsf STATUS,C | |
| 523 rlcf isr1_temp,F | |
| 524 decfsz clock_count,F | |
| 525 bra recieve_loop | |
| 526 return | |
| 527 | |
| 528 send_data_MS55535A: | |
| 529 ; send three startbits first | |
| 530 bcf sensor_CLK | |
| 531 bsf sensor_SDO | |
| 532 movlw d'3' | |
| 533 subwf clock_count,F ; total bit counter | |
| 534 bsf sensor_CLK | |
| 535 nop | |
| 536 nop | |
| 537 nop | |
| 538 nop | |
| 469 | 539 btfsc OSCCON,4 ; 32MHz Mode? |
| 540 rcall MS5535A_extra_wait ; Yes | |
| 0 | 541 bcf sensor_CLK |
| 542 nop | |
| 543 nop | |
| 544 nop | |
| 545 nop | |
| 469 | 546 btfsc OSCCON,4 ; 32MHz Mode? |
| 547 rcall MS5535A_extra_wait ; Yes | |
| 0 | 548 bsf sensor_CLK |
| 549 nop | |
| 550 nop | |
| 551 nop | |
| 552 nop | |
| 469 | 553 btfsc OSCCON,4 ; 32MHz Mode? |
| 554 rcall MS5535A_extra_wait ; Yes | |
| 0 | 555 bcf sensor_CLK |
| 556 nop | |
| 557 nop | |
| 558 nop | |
| 559 nop | |
| 469 | 560 btfsc OSCCON,4 ; 32MHz Mode? |
| 561 rcall MS5535A_extra_wait ; Yes | |
| 0 | 562 bsf sensor_CLK |
| 563 nop | |
| 564 nop | |
| 565 nop | |
| 566 nop | |
| 469 | 567 btfsc OSCCON,4 ; 32MHz Mode? |
| 568 rcall MS5535A_extra_wait ; Yes | |
| 0 | 569 bcf sensor_CLK |
| 570 ; now send 8 bytes from isr_temp1 and fill-up with zeros | |
| 469 | 571 databits: |
| 0 | 572 btfss isr1_temp,7 ;MSB first |
| 573 bcf sensor_SDO | |
| 574 btfsc isr1_temp,7 ;MSB first | |
| 575 bsf sensor_SDO | |
| 576 bcf STATUS,C | |
| 577 rlcf isr1_temp | |
| 578 | |
| 579 bsf sensor_CLK | |
| 580 nop | |
| 581 nop | |
| 582 nop | |
| 583 nop | |
| 469 | 584 btfsc OSCCON,4 ; 32MHz Mode? |
| 585 rcall MS5535A_extra_wait ; Yes | |
| 0 | 586 bcf sensor_CLK |
| 587 | |
| 588 decfsz clock_count,F | |
| 469 | 589 bra databits |
| 0 | 590 return |