Mercurial > public > hwos_code
annotate src/ms5541.asm @ 368:57e349960ef4
Additional temperature calibration via PC interface
| author | heinrichsweikamp |
|---|---|
| date | Sun, 16 Aug 2015 15:16:23 +0200 |
| parents | 573f2251cf49 |
| children | ca4556fb60b9 |
| rev | line source |
|---|---|
| 0 | 1 ;============================================================================= |
| 2 ; | |
| 3 ; File ms5541.asm | |
| 4 ; | |
| 5 ; Sensor subroutines | |
| 6 ; | |
| 7 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved. | |
| 8 ;============================================================================= | |
| 9 ; HISTORY | |
| 10 ; 2011-08-03 : [mH] moving from OSTC code | |
| 11 | |
| 275 | 12 #include "hwos.inc" ; Mandatory header |
| 0 | 13 #include "math.inc" ; Math routines |
| 14 | |
| 15 sensors CODE | |
| 16 | |
| 17 ;============================================================================= | |
| 18 ; Expose internal variables, to ease debug: | |
| 19 global D1, D2 | |
| 20 global C1, C2, C3, C4, C5, C6 | |
| 21 global xdT, xdT2, OFF, SENS, amb_pressure_avg, temperature_avg | |
| 22 | |
| 23 ;============================================================================= | |
| 24 global calculate_compensation | |
| 25 calculate_compensation: | |
| 26 ; xdT = D2 - C5 (s16 range -11.400 .. +12.350) | |
| 27 movf C5+0,W ; Get Value to be subtracted | |
| 28 subwf D2+0,W ; Do the Low Byte | |
| 29 movwf xdT+0 | |
| 30 movf C5+1,W ; Then the high byte. | |
| 31 subwfb D2+1,W | |
| 32 movwf xdT+1 | |
| 33 | |
| 34 ; Second order temperature calculation | |
| 35 ; xdT/128 is in range -89..+96, hence signed 8bit. dT/128 = (2*dT)/256 | |
| 36 rlcf xdT+0,W ; put hit bit in carry. | |
| 37 rlcf xdT+1,W ; inject in high byte. | |
| 38 movwf isr_xA+0 ; and put result in low byte. | |
| 39 clrf isr_xA+1 | |
| 40 btfsc xdT+1,7 ; If dT < 0 | |
| 41 setf isr_xA+1 ; then signextend to -1 | |
| 42 movff isr_xA+0,isr_xB+0 ; copy A to B | |
| 43 movff isr_xA+1,isr_xB+1 | |
| 44 call isr_signed_mult16x16 ; dT*dT --> xC (32 bits) | |
| 45 | |
| 46 ; dT >= 0: divide by 8, ie. 3 shifts rights. | |
| 47 ; dT < 0: divide by 2, ie. 1 shifts rights. | |
| 48 movlw .3 | |
| 49 btfss xdT+1,7 ; Was dT negative ? | |
| 50 movlw .1 | |
| 51 calc_loop_1: | |
| 52 bcf STATUS,C ;dT^2 is positive, so injected zeros. | |
| 53 rrcf isr_xC+1,F | |
| 54 rrcf isr_xC+0,F | |
| 55 decfsz WREG | |
| 56 bra calc_loop_1 | |
| 57 | |
| 58 movf isr_xC+0,W ; dT2 = dT - (dT/128)*(dT/128)/(2 ...or... 8) | |
| 59 subwf xdT+0,W | |
| 60 movwf xdT2+0 | |
| 61 movf isr_xC+1,W | |
| 62 subwfb xdT+1,W | |
| 63 movwf xdT2+1 | |
| 64 | |
| 65 ; Calculate OFF = C2 + ((C4-250)*dT2)/2^12 + 10000 | |
| 66 ; (range +9.246 .. +18.887) | |
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67 movff C4+0,isr_xA+0 ; C4 - 250 --> A |
| 0 | 68 movff C4+1,isr_xA+1 |
| 69 movff xdT2+0,isr_xB+0 ; dT2 --> B | |
| 70 movff xdT2+1,isr_xB+1 | |
| 71 call isr_signed_mult16x16 | |
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72 |
| 0 | 73 movlw .12-.8 ; A 12bit shift = 1 byte + 4 bits. |
| 74 call isr_shift_C31 | |
| 75 | |
| 76 movlw LOW(.10000) ; Add 10000 | |
| 77 addwf isr_xC+1,F | |
| 78 movlw HIGH(.10000) | |
| 79 addwfc isr_xC+2,F | |
| 80 | |
| 81 movf C2+0,W ; Add C2, and save into OFF | |
| 82 addwf isr_xC+1,W | |
| 83 movwf OFF+0 | |
| 84 movf C2+1,W | |
| 85 addwfc isr_xC+2,W | |
| 86 movwf OFF+1 | |
| 87 | |
| 88 ; Calculate SENS = C1/2 + ((C3+200)*dT)/2^13 + 3000 | |
| 89 movlw LOW(.200) ; C3+200 --> A | |
| 90 addwf C3+0,W | |
| 91 movwf isr_xA+0 | |
| 92 movlw HIGH(.200) | |
| 93 addwfc C3+1,W | |
| 94 movwf isr_xA+1 | |
| 95 ; B still contains dT2 | |
| 96 call isr_signed_mult16x16 ; A*B --> C | |
| 97 movlw .13-.8 ; A 13bit shift = 1 byte + 5 bits. | |
| 98 call isr_shift_C31 | |
| 99 | |
| 100 bcf STATUS,C ; SENS = C1 / 2 | |
| 101 rrcf C1+1,W | |
| 102 movwf SENS+1 | |
| 103 rrcf C1+0,W | |
| 104 movwf SENS+0 | |
| 105 | |
| 106 movlw LOW(.3000) ; Add 3000 | |
| 107 addwf isr_xC+1,F | |
| 108 movlw HIGH(.3000) | |
| 109 addwfc isr_xC+2,F | |
| 110 | |
| 111 movf isr_xC+1,W ; And sum into SENS | |
| 112 addwf SENS+0,F | |
| 113 movf isr_xC+2,W | |
| 114 addwfc SENS+1,F | |
| 115 | |
| 116 ; calculate amb_pressure = (sens * (d1-off))/2^12 + 1000 | |
| 117 movf OFF+0,W ; d1-off --> a | |
| 118 subwf D1+0,W | |
| 119 movwf isr_xA+0 | |
| 120 movf OFF+1,W | |
| 121 subwfb D1+1,W | |
| 122 movwf isr_xA+1 | |
| 123 | |
| 124 movff SENS+0,isr_xB+0 ; sens --> b | |
| 125 movff SENS+1,isr_xB+1 | |
| 126 call isr_signed_mult16x16 | |
| 127 movlw .12-.8 ; a 12bit shift = 1 byte + 4 bits. | |
| 128 call isr_shift_C31 | |
| 129 | |
| 130 movlw LOW(.1000) ; add 1000 | |
| 131 addwf isr_xC+1,F | |
| 132 movlw HIGH(.1000) | |
| 133 addwfc isr_xC+2,F | |
| 134 | |
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135 ; Add opt_pressure_adjust to result (SIGNED!) |
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136 movff opt_pressure_adjust,isr_xC+0 |
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137 |
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138 btfss isr_xC+0,7 ; <0? |
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139 bra pressure_extra_add ; No |
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140 ; Yes |
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141 comf isr_xC+0,F |
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142 incf isr_xC+0,F |
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143 ; Check for max. of 20mbar |
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144 movlw .22 |
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145 cpfslt isr_xC+0 |
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146 clrf isr_xC+0 |
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147 ; Subtract |
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148 movf isr_xC+0,W |
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149 subwf isr_xC+1,F |
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150 movlw .0 |
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151 subwfb isr_xC+2,F |
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152 bra pressure_extra_common |
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153 |
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154 pressure_extra_add: |
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155 ; Check for max. of 20mbar |
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156 movlw .21 |
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157 cpfslt isr_xC+0 |
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158 clrf isr_xC+0 |
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159 ; Add |
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160 movf isr_xC+0,W |
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161 addwf isr_xC+1,F |
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162 movlw .0 |
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163 addwfc isr_xC+2,F |
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164 |
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165 pressure_extra_common: |
| 178 | 166 banksel common ; flag2 is in bank 1 |
| 0 | 167 btfss simulatormode_active ; are we in simulator mode? |
| 168 bra calc_compensation_2 ; no | |
| 169 | |
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170 banksel isr_xC+2 |
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171 movlw .5 |
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172 cpfsgt isr_xC+2 ; >1280mbar ? |
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173 bra pressure_extra_common2 ; No |
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174 ; Yes, reset sim_pressure:2 to 1000mbar (End of sim) |
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175 movlw LOW .1000 |
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176 movwf sim_pressure+0 |
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177 movlw HIGH .1000 |
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178 movwf sim_pressure+1 |
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179 |
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180 pressure_extra_common2: |
| 0 | 181 movff sim_pressure+0,isr_xC+1 ; override readings with simulator values |
| 182 movff sim_pressure+1,isr_xC+2 | |
| 183 | |
| 184 calc_compensation_2: | |
| 185 banksel isr_backup | |
| 186 movf isr_xC+1,W ; Then sum_up to pressure averaging buffer. | |
| 187 addwf amb_pressure_avg+0,F | |
| 188 movf isr_xC+2,W | |
| 189 addwfc amb_pressure_avg+1,F | |
| 190 | |
| 191 ; calculate temp = 200 + dT*(C6+100)/2^11 | |
| 192 movlw LOW(.100) ; C6 + 100 --> A | |
| 193 addwf C6+0,W | |
| 194 movwf isr_xA+0 | |
| 195 movlw HIGH(.100) | |
| 196 addwfc C6+1,W | |
| 197 movwf isr_xA+1 | |
| 198 | |
| 199 movff xdT2+0,isr_xB+0 ; dT2 --> B | |
| 200 movff xdT2+1,isr_xB+1 | |
| 201 call isr_signed_mult16x16 ; A*B | |
| 202 movlw .11-.8 ; A 12bit shift = 1 byte + 3 bits. | |
| 203 call isr_shift_C31 | |
| 204 | |
| 205 movlw LOW(.200) ; Add 200 | |
| 206 addwf isr_xC+1,F | |
| 207 movlw HIGH(.200) | |
| 208 addwfc isr_xC+2,F | |
| 209 | |
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210 ; Add opt_temperature_adjust to result (SIGNED!) |
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211 movff opt_temperature_adjust,isr_xC+0 |
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212 |
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213 btfss isr_xC+0,7 ; <0? |
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214 bra temperature_extra_add ; No |
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215 ; Yes |
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216 comf isr_xC+0,F |
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217 incf isr_xC+0,F |
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218 ; Check for max. of 2.0°C |
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219 movlw .22 |
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220 cpfslt isr_xC+0 |
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221 clrf isr_xC+0 |
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222 ; Subtract |
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223 movf isr_xC+0,W |
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224 subwf isr_xC+1,F |
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225 movlw .0 |
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226 subwfb isr_xC+2,F |
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227 bra temperature_extra_common |
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228 |
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229 temperature_extra_add: |
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230 ; Check for max. of 2.0°C |
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231 movlw .21 |
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232 cpfslt isr_xC+0 |
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233 clrf isr_xC+0 |
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234 ; Add |
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235 movf isr_xC+0,W |
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236 addwf isr_xC+1,F |
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237 movlw .0 |
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238 addwfc isr_xC+2,F |
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239 temperature_extra_common: |
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240 |
| 0 | 241 movf isr_xC+1,W |
| 242 addwf temperature_avg+0,F | |
| 243 movf isr_xC+2,W | |
| 244 addwfc temperature_avg+1,F | |
| 245 | |
| 246 return ; Done. | |
| 247 | |
| 248 ;============================================================================= | |
| 249 global get_pressure_start | |
| 250 get_pressure_start: | |
| 251 rcall reset_MS5541 | |
| 252 movlw b'10100000' ;+3*high as start and 1+low as stop! | |
| 253 get_pressure_start2: | |
| 254 movwf isr1_temp | |
| 255 movlw d'12' | |
| 256 rcall send_data_MS5541 | |
| 257 return | |
| 258 | |
| 259 global get_pressure_value | |
| 260 get_pressure_value: | |
| 261 btfsc MS5541_miso ; Conversion done? | |
| 262 return ; No, Return | |
| 263 rcall get_2bytes_MS5541 | |
| 264 movff dMSB,D1+1 | |
| 265 movff dLSB,D1+0 | |
| 266 return | |
| 267 | |
| 268 ;============================================================================= | |
| 269 global get_temperature_start | |
| 270 get_temperature_start: | |
| 271 rcall reset_MS5541 | |
| 272 movlw b'10010000' ;+3*high as start and 1+low as stop! | |
| 273 bra get_pressure_start2 ; continue in "get_pressure" | |
| 274 | |
| 275 global get_temperature_value | |
| 276 get_temperature_value: | |
| 277 btfsc MS5541_miso ; Conversion done? | |
| 278 return ; No, Return | |
| 279 rcall get_2bytes_MS5541 | |
| 280 movff dMSB,D2+1 | |
| 281 movff dLSB,D2+0 | |
| 282 return | |
| 283 | |
| 284 ;============================================================================= | |
| 285 global get_calibration_data | |
| 286 get_calibration_data: | |
| 287 banksel common | |
| 288 bsf no_sensor_int ; disable sensor interrupts | |
| 289 banksel isr_backup ; Back to Bank0 ISR data | |
| 290 | |
| 291 rcall reset_MS5541 | |
| 292 movlw b'01010100' ;+3*high as start and 1+low as stop! | |
| 293 movwf isr1_temp | |
| 294 movlw d'13' | |
| 295 rcall send_data_MS5541 | |
| 296 rcall get_2bytes_MS5541 | |
| 255 | 297 movff dMSB,ir_s8_buffer+1 |
| 298 movff dLSB,ir_s8_buffer+0 | |
| 0 | 299 |
| 300 movlw b'01011000' ;+3*high as start and 1+low as stop! | |
| 301 movwf isr1_temp | |
| 302 movlw d'13' | |
| 303 rcall send_data_MS5541 | |
| 304 rcall get_2bytes_MS5541 | |
| 255 | 305 movff dMSB,ir_s8_buffer+3 |
| 306 movff dLSB,ir_s8_buffer+2 | |
| 0 | 307 |
| 308 movlw b'01100100' ;+3*high as start and 1+low as stop! | |
| 309 movwf isr1_temp | |
| 310 movlw d'13' | |
| 311 rcall send_data_MS5541 | |
| 312 rcall get_2bytes_MS5541 | |
| 255 | 313 movff dMSB,ir_s8_buffer+5 |
| 314 movff dLSB,ir_s8_buffer+4 | |
| 0 | 315 |
| 316 movlw b'01101000' ;+3*high as start and 1+low as stop! | |
| 317 movwf isr1_temp | |
| 318 movlw d'13' | |
| 319 rcall send_data_MS5541 | |
| 320 rcall get_2bytes_MS5541 | |
| 255 | 321 movff dMSB,ir_s8_buffer+7 |
| 322 movff dLSB,ir_s8_buffer+6 | |
| 0 | 323 |
| 324 ; calculate C1 (16Bit) | |
| 255 | 325 movff ir_s8_buffer+1, C1+1 |
| 0 | 326 bcf STATUS,C |
| 327 rrcf C1+1 | |
| 328 bcf STATUS,C | |
| 329 rrcf C1+1 | |
| 330 bcf STATUS,C | |
| 331 rrcf C1+1 | |
| 255 | 332 movff ir_s8_buffer+0, C1+0 |
| 0 | 333 bsf STATUS,C |
| 255 | 334 btfss ir_s8_buffer+1,0 |
| 0 | 335 bcf STATUS,C |
| 336 rrcf C1+0 | |
| 337 bsf STATUS,C | |
| 255 | 338 btfss ir_s8_buffer+1,1 |
| 0 | 339 bcf STATUS,C |
| 340 rrcf C1+0 | |
| 341 bsf STATUS,C | |
| 255 | 342 btfss ir_s8_buffer+1,2 |
| 0 | 343 bcf STATUS,C |
| 344 rrcf C1+0 | |
| 345 | |
| 346 ; calculate C2 (16Bit) | |
| 255 | 347 movff ir_s8_buffer+2, C2+0 |
| 0 | 348 bsf STATUS,C |
| 255 | 349 btfss ir_s8_buffer+3,0 |
| 0 | 350 bcf STATUS,C |
| 351 rrcf C2+0 | |
| 352 bsf STATUS,C | |
| 255 | 353 btfss ir_s8_buffer+3,1 |
| 0 | 354 bcf STATUS,C |
| 355 rrcf C2+0 | |
| 356 bsf STATUS,C | |
| 255 | 357 btfss ir_s8_buffer+3,2 |
| 0 | 358 bcf STATUS,C |
| 359 rrcf C2+0 | |
| 360 bsf STATUS,C | |
| 255 | 361 btfss ir_s8_buffer+3,3 |
| 0 | 362 bcf STATUS,C |
| 363 rrcf C2+0 | |
| 364 bsf STATUS,C | |
| 255 | 365 btfss ir_s8_buffer+3,4 |
| 0 | 366 bcf STATUS,C |
| 367 rrcf C2+0 | |
| 368 bsf STATUS,C | |
| 255 | 369 btfss ir_s8_buffer+3,5 |
| 0 | 370 bcf STATUS,C |
| 371 rrcf C2+0 | |
| 372 | |
| 255 | 373 movff ir_s8_buffer+3, C2+1 |
| 0 | 374 bsf STATUS,C |
| 255 | 375 btfss ir_s8_buffer+0,0 |
| 0 | 376 bcf STATUS,C |
| 377 rrcf C2+1 | |
| 378 bsf STATUS,C | |
| 255 | 379 btfss ir_s8_buffer+0,1 |
| 0 | 380 bcf STATUS,C |
| 381 rrcf C2+1 | |
| 382 bsf STATUS,C | |
| 255 | 383 btfss ir_s8_buffer+0,2 |
| 0 | 384 bcf STATUS,C |
| 385 rrcf C2+1 | |
| 386 bcf STATUS,C | |
| 387 rrcf C2+1 | |
| 388 bcf STATUS,C | |
| 389 rrcf C2+1 | |
| 390 bcf STATUS,C | |
| 391 rrcf C2+1 | |
| 392 | |
| 393 ; calculate C3 (16Bit) | |
| 255 | 394 movff ir_s8_buffer+5,C3+0 |
| 0 | 395 bsf STATUS,C |
| 255 | 396 btfss ir_s8_buffer+4,7 |
| 0 | 397 bcf STATUS,C |
| 398 rlcf C3+0 | |
| 399 bsf STATUS,C | |
| 255 | 400 btfss ir_s8_buffer+4,6 |
| 0 | 401 bcf STATUS,C |
| 402 rlcf C3+0 | |
| 403 clrf C3+1 | |
| 255 | 404 btfsc ir_s8_buffer+5,7 |
| 0 | 405 bsf C3+1,1 |
| 255 | 406 btfsc ir_s8_buffer+5,6 |
| 0 | 407 bsf C3+1,0 |
| 408 | |
| 409 ; calculate C4 (16Bit) | |
| 255 | 410 movff ir_s8_buffer+7,C4+0 |
| 0 | 411 bsf STATUS,C |
| 255 | 412 btfss ir_s8_buffer+6,7 |
| 0 | 413 bcf STATUS,C |
| 414 rlcf C4+0 | |
| 415 clrf C4+1 | |
| 255 | 416 btfsc ir_s8_buffer+7,7 |
| 0 | 417 bsf C4+1,0 |
| 418 | |
| 419 ; C4=C4-250 | |
| 420 movlw LOW(-.250) ; C4 - 250 --> C4 | |
| 421 addwf C4+0,W | |
| 422 movwf C4+0 | |
| 423 movlw -1 ; HIGH(- .250) is not understood... | |
| 424 addwfc C4+1,W | |
| 425 movwf C4+1 | |
| 426 | |
| 427 ; calculate C5 (16Bit) | |
| 255 | 428 movff ir_s8_buffer+4,C5+0 |
| 0 | 429 bcf C5+0,6 |
| 255 | 430 btfsc ir_s8_buffer+2,0 |
| 0 | 431 bsf C5+0,6 |
| 432 bcf C5+0,7 | |
| 255 | 433 btfsc ir_s8_buffer+2,1 |
| 0 | 434 bsf C5+0,7 |
| 435 clrf C5+1 | |
| 255 | 436 btfsc ir_s8_buffer+2,2 |
| 0 | 437 bsf C5+1,0 |
| 255 | 438 btfsc ir_s8_buffer+2,3 |
| 0 | 439 bsf C5+1,1 |
| 255 | 440 btfsc ir_s8_buffer+2,4 |
| 0 | 441 bsf C5+1,2 |
| 255 | 442 btfsc ir_s8_buffer+2,5 |
| 0 | 443 bsf C5+1,3 |
| 444 | |
| 445 ; calculate C5 = UT1 | |
| 446 ; C5 = 8*C5 + 10000 (u16 range 10.000 .. +42.760) | |
| 447 clrf isr_xA+1 | |
| 448 movlw d'8' | |
| 449 movwf isr_xA+0 | |
| 450 movff C5+0,isr_xB+0 | |
| 451 movff C5+1,isr_xB+1 | |
| 452 call isr_unsigned_mult16x16 ;isr_xA*isr_xB=isr_xC | |
| 453 movff isr_xC+0,C5+0 | |
| 454 movff isr_xC+1,C5+1 | |
| 455 movlw LOW d'10000' | |
| 456 addwf C5+0,F | |
| 457 movlw HIGH d'10000' | |
| 458 addwfc C5+1,F ; = 8*C5 + 10000 | |
| 459 | |
| 460 ; calculate C6 (16Bit) | |
| 461 clrf C6+1 | |
| 255 | 462 movff ir_s8_buffer+6,C6+0 |
| 0 | 463 bcf C6+0,7 |
| 464 | |
| 465 banksel common | |
| 466 bcf no_sensor_int ; enable sensor interrupts | |
| 467 bcf pressure_refresh ; Clear flag | |
| 468 banksel isr_backup ; Back to Bank0 ISR data | |
| 469 | |
| 470 clrf sensor_state_counter ; Then reset State counter | |
| 471 | |
| 472 return | |
| 473 | |
| 474 ;============================================================================= | |
| 475 reset_MS5541_one: | |
| 476 bsf MS5541_mosi | |
| 477 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 478 | |
| 479 reset_MS5541_zero: | |
| 480 bcf MS5541_mosi | |
| 481 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 482 | |
| 483 reset_MS5541: | |
| 484 rcall reset_MS5541_one ;0 | |
| 485 rcall reset_MS5541_zero | |
| 486 rcall reset_MS5541_one | |
| 487 rcall reset_MS5541_zero | |
| 488 rcall reset_MS5541_one | |
| 489 rcall reset_MS5541_zero | |
| 490 rcall reset_MS5541_one | |
| 491 rcall reset_MS5541_zero | |
| 492 rcall reset_MS5541_one | |
| 493 rcall reset_MS5541_zero | |
| 494 rcall reset_MS5541_one | |
| 495 rcall reset_MS5541_zero | |
| 496 rcall reset_MS5541_one | |
| 497 rcall reset_MS5541_zero | |
| 498 rcall reset_MS5541_one | |
| 499 rcall reset_MS5541_zero ;15 | |
| 500 rcall reset_MS5541_zero | |
| 501 rcall reset_MS5541_zero | |
| 502 rcall reset_MS5541_zero | |
| 503 rcall reset_MS5541_zero | |
| 504 rcall reset_MS5541_zero ;20 | |
| 505 return | |
| 506 | |
| 507 get_2bytes_MS5541: | |
| 508 movlw d'8' | |
| 509 movwf clock_count | |
| 510 rcall recieve_loop | |
| 511 movff isr1_temp,dMSB | |
| 512 | |
| 513 movlw d'8' | |
| 514 movwf clock_count | |
| 515 rcall recieve_loop | |
| 516 movff isr1_temp,dLSB | |
| 517 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 518 ;return | |
| 519 | |
| 520 recieve_loop: | |
| 521 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 522 btfss MS5541_miso ;MSB first | |
| 523 bcf STATUS,C | |
| 524 btfsc MS5541_miso ;MSB first | |
| 525 bsf STATUS,C | |
| 526 rlcf isr1_temp,F | |
| 527 decfsz clock_count,F | |
| 528 bra recieve_loop | |
| 529 return | |
| 530 | |
| 531 send_clk_pulse: | |
| 532 bsf MS5541_clk | |
| 533 nop | |
| 534 nop | |
| 535 nop | |
| 536 nop | |
|
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537 nop |
|
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538 nop |
| 0 | 539 bcf MS5541_clk |
| 540 nop | |
| 541 nop | |
|
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542 nop |
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543 nop |
| 0 | 544 return |
| 545 | |
| 546 send_data_MS5541: | |
| 547 movwf clock_count ; From WREG | |
| 548 ; send three startbits first | |
| 549 bcf MS5541_clk | |
|
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550 nop |
|
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551 nop |
| 0 | 552 bsf MS5541_mosi |
| 553 movlw d'3' | |
| 554 subwf clock_count,F ; total bit counter | |
| 555 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 556 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 557 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 558 ; now send 8 bytes from isr_temp1 and fill-up with zeros | |
| 559 send_data_MS5541_2: | |
| 560 bcf MS5541_clk | |
|
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561 nop |
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562 nop |
| 0 | 563 |
| 564 btfss isr1_temp,7 ;MSB first | |
| 565 bcf MS5541_mosi | |
| 566 btfsc isr1_temp,7 ;MSB first | |
| 567 bsf MS5541_mosi | |
| 568 | |
| 569 bsf MS5541_clk | |
| 570 | |
| 571 bcf STATUS,C | |
| 572 rlcf isr1_temp,F | |
|
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573 nop |
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|
574 nop |
| 0 | 575 ; nop |
| 576 ; nop | |
| 577 ; nop | |
| 578 ; nop | |
| 579 ; bcf MS5541_clk | |
| 580 | |
| 581 decfsz clock_count,F | |
| 582 bra send_data_MS5541_2 | |
| 583 bcf MS5541_clk | |
| 584 return | |
| 585 | |
| 586 END |