Mercurial > public > hwos_code
annotate src/ms5541.asm @ 250:20e3bad0b0f2
Graphical compass from kovacs
| author | heinrichsweikamp |
|---|---|
| date | Wed, 18 Mar 2015 16:42:49 +0100 |
| parents | 39f6c07ce2f6 |
| children | ad62dff7739a |
| 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 | |
| 12 #include "ostc3.inc" ; Mandatory header | |
| 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) | |
| 67 movff C4+0,isr_xA+0 | |
| 68 movff C4+1,isr_xA+1 | |
| 69 ; movlw LOW(-.250) ; C4 - 250 --> A | |
| 70 ; addwf C4+0,W | |
| 71 ; movwf isr_xA+0 | |
| 72 ; movlw -1 ; HIGH(- .250) is not understood... | |
| 73 ; addwfc C4+1,W | |
| 74 ; movwf isr_xA+1 | |
| 75 | |
| 76 movff xdT2+0,isr_xB+0 ; dT2 --> B | |
| 77 movff xdT2+1,isr_xB+1 | |
| 78 call isr_signed_mult16x16 | |
| 79 movlw .12-.8 ; A 12bit shift = 1 byte + 4 bits. | |
| 80 call isr_shift_C31 | |
| 81 | |
| 82 movlw LOW(.10000) ; Add 10000 | |
| 83 addwf isr_xC+1,F | |
| 84 movlw HIGH(.10000) | |
| 85 addwfc isr_xC+2,F | |
| 86 | |
| 87 movf C2+0,W ; Add C2, and save into OFF | |
| 88 addwf isr_xC+1,W | |
| 89 movwf OFF+0 | |
| 90 movf C2+1,W | |
| 91 addwfc isr_xC+2,W | |
| 92 movwf OFF+1 | |
| 93 | |
| 94 ; Calculate SENS = C1/2 + ((C3+200)*dT)/2^13 + 3000 | |
| 95 movlw LOW(.200) ; C3+200 --> A | |
| 96 addwf C3+0,W | |
| 97 movwf isr_xA+0 | |
| 98 movlw HIGH(.200) | |
| 99 addwfc C3+1,W | |
| 100 movwf isr_xA+1 | |
| 101 ; B still contains dT2 | |
| 102 call isr_signed_mult16x16 ; A*B --> C | |
| 103 movlw .13-.8 ; A 13bit shift = 1 byte + 5 bits. | |
| 104 call isr_shift_C31 | |
| 105 | |
| 106 bcf STATUS,C ; SENS = C1 / 2 | |
| 107 rrcf C1+1,W | |
| 108 movwf SENS+1 | |
| 109 rrcf C1+0,W | |
| 110 movwf SENS+0 | |
| 111 | |
| 112 movlw LOW(.3000) ; Add 3000 | |
| 113 addwf isr_xC+1,F | |
| 114 movlw HIGH(.3000) | |
| 115 addwfc isr_xC+2,F | |
| 116 | |
| 117 movf isr_xC+1,W ; And sum into SENS | |
| 118 addwf SENS+0,F | |
| 119 movf isr_xC+2,W | |
| 120 addwfc SENS+1,F | |
| 121 | |
| 122 ; calculate amb_pressure = (sens * (d1-off))/2^12 + 1000 | |
| 123 movf OFF+0,W ; d1-off --> a | |
| 124 subwf D1+0,W | |
| 125 movwf isr_xA+0 | |
| 126 movf OFF+1,W | |
| 127 subwfb D1+1,W | |
| 128 movwf isr_xA+1 | |
| 129 | |
| 130 movff SENS+0,isr_xB+0 ; sens --> b | |
| 131 movff SENS+1,isr_xB+1 | |
| 132 call isr_signed_mult16x16 | |
| 133 movlw .12-.8 ; a 12bit shift = 1 byte + 4 bits. | |
| 134 call isr_shift_C31 | |
| 135 | |
| 136 movlw LOW(.1000) ; add 1000 | |
| 137 addwf isr_xC+1,F | |
| 138 movlw HIGH(.1000) | |
| 139 addwfc isr_xC+2,F | |
| 140 | |
|
92
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
141 ; Add opt_pressure_adjust to result (SIGNED!) |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
142 movff opt_pressure_adjust,isr_xC+0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
143 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
144 btfss isr_xC+0,7 ; <0? |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
145 bra pressure_extra_add ; No |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
146 ; Yes |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
147 comf isr_xC+0,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
148 incf isr_xC+0,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
149 ; Check for max. of 20mbar |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
150 movlw .21 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
151 cpfslt isr_xC+0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
152 clrf isr_xC+0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
153 ; Subtract |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
154 movf isr_xC+0,W |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
155 subwf isr_xC+1,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
156 movlw .0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
157 subwfb isr_xC+2,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
158 bra pressure_extra_common |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
159 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
160 pressure_extra_add: |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
161 ; Check for max. of 20mbar |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
162 movlw .21 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
163 cpfslt isr_xC+0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
164 clrf isr_xC+0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
165 ; Add |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
166 movf isr_xC+0,W |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
167 addwf isr_xC+1,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
168 movlw .0 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
169 addwfc isr_xC+2,F |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
170 |
|
7ca1105751c7
add sensor calibration option (PC only), some cleanup
heinrichsweikamp
parents:
29
diff
changeset
|
171 pressure_extra_common: |
| 178 | 172 banksel common ; flag2 is in bank 1 |
| 0 | 173 btfss simulatormode_active ; are we in simulator mode? |
| 174 bra calc_compensation_2 ; no | |
| 175 | |
| 176 movff sim_pressure+0,isr_xC+1 ; override readings with simulator values | |
| 177 movff sim_pressure+1,isr_xC+2 | |
| 178 | |
| 179 calc_compensation_2: | |
| 180 banksel isr_backup | |
| 181 movf isr_xC+1,W ; Then sum_up to pressure averaging buffer. | |
| 182 addwf amb_pressure_avg+0,F | |
| 183 movf isr_xC+2,W | |
| 184 addwfc amb_pressure_avg+1,F | |
| 185 | |
| 186 ; calculate temp = 200 + dT*(C6+100)/2^11 | |
| 187 movlw LOW(.100) ; C6 + 100 --> A | |
| 188 addwf C6+0,W | |
| 189 movwf isr_xA+0 | |
| 190 movlw HIGH(.100) | |
| 191 addwfc C6+1,W | |
| 192 movwf isr_xA+1 | |
| 193 | |
| 194 movff xdT2+0,isr_xB+0 ; dT2 --> B | |
| 195 movff xdT2+1,isr_xB+1 | |
| 196 call isr_signed_mult16x16 ; A*B | |
| 197 movlw .11-.8 ; A 12bit shift = 1 byte + 3 bits. | |
| 198 call isr_shift_C31 | |
| 199 | |
| 200 movlw LOW(.200) ; Add 200 | |
| 201 addwf isr_xC+1,F | |
| 202 movlw HIGH(.200) | |
| 203 addwfc isr_xC+2,F | |
| 204 | |
| 205 movf isr_xC+1,W | |
| 206 addwf temperature_avg+0,F | |
| 207 movf isr_xC+2,W | |
| 208 addwfc temperature_avg+1,F | |
| 209 | |
| 210 return ; Done. | |
| 211 | |
| 212 ;============================================================================= | |
| 213 global get_pressure_start | |
| 214 get_pressure_start: | |
| 215 rcall reset_MS5541 | |
| 216 movlw b'10100000' ;+3*high as start and 1+low as stop! | |
| 217 get_pressure_start2: | |
| 218 movwf isr1_temp | |
| 219 movlw d'12' | |
| 220 rcall send_data_MS5541 | |
| 221 return | |
| 222 | |
| 223 global get_pressure_value | |
| 224 get_pressure_value: | |
| 225 btfsc MS5541_miso ; Conversion done? | |
| 226 return ; No, Return | |
| 227 rcall get_2bytes_MS5541 | |
| 228 movff dMSB,D1+1 | |
| 229 movff dLSB,D1+0 | |
| 230 return | |
| 231 | |
| 232 ;============================================================================= | |
| 233 global get_temperature_start | |
| 234 get_temperature_start: | |
| 235 rcall reset_MS5541 | |
| 236 movlw b'10010000' ;+3*high as start and 1+low as stop! | |
| 237 bra get_pressure_start2 ; continue in "get_pressure" | |
| 238 | |
| 239 global get_temperature_value | |
| 240 get_temperature_value: | |
| 241 btfsc MS5541_miso ; Conversion done? | |
| 242 return ; No, Return | |
| 243 rcall get_2bytes_MS5541 | |
| 244 movff dMSB,D2+1 | |
| 245 movff dLSB,D2+0 | |
| 246 return | |
| 247 | |
| 248 ;============================================================================= | |
| 249 global get_calibration_data | |
| 250 get_calibration_data: | |
| 251 banksel common | |
| 252 bsf no_sensor_int ; disable sensor interrupts | |
| 253 banksel isr_backup ; Back to Bank0 ISR data | |
| 254 | |
| 255 rcall reset_MS5541 | |
| 256 movlw b'01010100' ;+3*high as start and 1+low as stop! | |
| 257 movwf isr1_temp | |
| 258 movlw d'13' | |
| 259 rcall send_data_MS5541 | |
| 260 rcall get_2bytes_MS5541 | |
| 261 movff dMSB,W1+1 | |
| 262 movff dLSB,W1+0 | |
| 263 | |
| 264 movlw b'01011000' ;+3*high as start and 1+low as stop! | |
| 265 movwf isr1_temp | |
| 266 movlw d'13' | |
| 267 rcall send_data_MS5541 | |
| 268 rcall get_2bytes_MS5541 | |
| 269 movff dMSB,W2+1 | |
| 270 movff dLSB,W2+0 | |
| 271 | |
| 272 movlw b'01100100' ;+3*high as start and 1+low as stop! | |
| 273 movwf isr1_temp | |
| 274 movlw d'13' | |
| 275 rcall send_data_MS5541 | |
| 276 rcall get_2bytes_MS5541 | |
| 277 movff dMSB,W3+1 | |
| 278 movff dLSB,W3+0 | |
| 279 | |
| 280 movlw b'01101000' ;+3*high as start and 1+low as stop! | |
| 281 movwf isr1_temp | |
| 282 movlw d'13' | |
| 283 rcall send_data_MS5541 | |
| 284 rcall get_2bytes_MS5541 | |
| 285 movff dMSB,W4+1 | |
| 286 movff dLSB,W4+0 | |
| 287 | |
| 288 ; calculate C1 (16Bit) | |
| 289 movff W1+1, C1+1 | |
| 290 bcf STATUS,C | |
| 291 rrcf C1+1 | |
| 292 bcf STATUS,C | |
| 293 rrcf C1+1 | |
| 294 bcf STATUS,C | |
| 295 rrcf C1+1 | |
| 296 movff W1+0, C1+0 | |
| 297 bsf STATUS,C | |
| 298 btfss W1+1,0 | |
| 299 bcf STATUS,C | |
| 300 rrcf C1+0 | |
| 301 bsf STATUS,C | |
| 302 btfss W1+1,1 | |
| 303 bcf STATUS,C | |
| 304 rrcf C1+0 | |
| 305 bsf STATUS,C | |
| 306 btfss W1+1,2 | |
| 307 bcf STATUS,C | |
| 308 rrcf C1+0 | |
| 309 | |
| 310 ; calculate C2 (16Bit) | |
| 311 movff W2+0, C2+0 | |
| 312 bsf STATUS,C | |
| 313 btfss W2+1,0 | |
| 314 bcf STATUS,C | |
| 315 rrcf C2+0 | |
| 316 bsf STATUS,C | |
| 317 btfss W2+1,1 | |
| 318 bcf STATUS,C | |
| 319 rrcf C2+0 | |
| 320 bsf STATUS,C | |
| 321 btfss W2+1,2 | |
| 322 bcf STATUS,C | |
| 323 rrcf C2+0 | |
| 324 bsf STATUS,C | |
| 325 btfss W2+1,3 | |
| 326 bcf STATUS,C | |
| 327 rrcf C2+0 | |
| 328 bsf STATUS,C | |
| 329 btfss W2+1,4 | |
| 330 bcf STATUS,C | |
| 331 rrcf C2+0 | |
| 332 bsf STATUS,C | |
| 333 btfss W2+1,5 | |
| 334 bcf STATUS,C | |
| 335 rrcf C2+0 | |
| 336 | |
| 337 movff W2+1, C2+1 | |
| 338 bsf STATUS,C | |
| 339 btfss W1+0,0 | |
| 340 bcf STATUS,C | |
| 341 rrcf C2+1 | |
| 342 bsf STATUS,C | |
| 343 btfss W1+0,1 | |
| 344 bcf STATUS,C | |
| 345 rrcf C2+1 | |
| 346 bsf STATUS,C | |
| 347 btfss W1+0,2 | |
| 348 bcf STATUS,C | |
| 349 rrcf C2+1 | |
| 350 bcf STATUS,C | |
| 351 rrcf C2+1 | |
| 352 bcf STATUS,C | |
| 353 rrcf C2+1 | |
| 354 bcf STATUS,C | |
| 355 rrcf C2+1 | |
| 356 | |
| 357 ; calculate C3 (16Bit) | |
| 358 movff W3+1,C3+0 | |
| 359 bsf STATUS,C | |
| 360 btfss W3+0,7 | |
| 361 bcf STATUS,C | |
| 362 rlcf C3+0 | |
| 363 bsf STATUS,C | |
| 364 btfss W3+0,6 | |
| 365 bcf STATUS,C | |
| 366 rlcf C3+0 | |
| 367 clrf C3+1 | |
| 368 btfsc W3+1,7 | |
| 369 bsf C3+1,1 | |
| 370 btfsc W3+1,6 | |
| 371 bsf C3+1,0 | |
| 372 | |
| 373 ; calculate C4 (16Bit) | |
| 374 movff W4+1,C4+0 | |
| 375 bsf STATUS,C | |
| 376 btfss W4+0,7 | |
| 377 bcf STATUS,C | |
| 378 rlcf C4+0 | |
| 379 clrf C4+1 | |
| 380 btfsc W4+1,7 | |
| 381 bsf C4+1,0 | |
| 382 | |
| 383 ; C4=C4-250 | |
| 384 movlw LOW(-.250) ; C4 - 250 --> C4 | |
| 385 addwf C4+0,W | |
| 386 movwf C4+0 | |
| 387 movlw -1 ; HIGH(- .250) is not understood... | |
| 388 addwfc C4+1,W | |
| 389 movwf C4+1 | |
| 390 | |
| 391 ; calculate C5 (16Bit) | |
| 392 movff W3+0,C5+0 | |
| 393 bcf C5+0,6 | |
| 394 btfsc W2+0,0 | |
| 395 bsf C5+0,6 | |
| 396 bcf C5+0,7 | |
| 397 btfsc W2+0,1 | |
| 398 bsf C5+0,7 | |
| 399 clrf C5+1 | |
| 400 btfsc W2+0,2 | |
| 401 bsf C5+1,0 | |
| 402 btfsc W2+0,3 | |
| 403 bsf C5+1,1 | |
| 404 btfsc W2+0,4 | |
| 405 bsf C5+1,2 | |
| 406 btfsc W2+0,5 | |
| 407 bsf C5+1,3 | |
| 408 | |
| 409 ; calculate C5 = UT1 | |
| 410 ; C5 = 8*C5 + 10000 (u16 range 10.000 .. +42.760) | |
| 411 clrf isr_xA+1 | |
| 412 movlw d'8' | |
| 413 movwf isr_xA+0 | |
| 414 movff C5+0,isr_xB+0 | |
| 415 movff C5+1,isr_xB+1 | |
| 416 call isr_unsigned_mult16x16 ;isr_xA*isr_xB=isr_xC | |
| 417 movff isr_xC+0,C5+0 | |
| 418 movff isr_xC+1,C5+1 | |
| 419 movlw LOW d'10000' | |
| 420 addwf C5+0,F | |
| 421 movlw HIGH d'10000' | |
| 422 addwfc C5+1,F ; = 8*C5 + 10000 | |
| 423 | |
| 424 ; calculate C6 (16Bit) | |
| 425 clrf C6+1 | |
| 426 movff W4+0,C6+0 | |
| 427 bcf C6+0,7 | |
| 428 | |
| 429 banksel common | |
| 430 bcf no_sensor_int ; enable sensor interrupts | |
| 431 bcf pressure_refresh ; Clear flag | |
| 432 banksel isr_backup ; Back to Bank0 ISR data | |
| 433 | |
| 434 clrf sensor_state_counter ; Then reset State counter | |
| 435 | |
| 436 return | |
| 437 | |
| 438 ;============================================================================= | |
| 439 reset_MS5541_one: | |
| 440 bsf MS5541_mosi | |
| 441 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 442 | |
| 443 reset_MS5541_zero: | |
| 444 bcf MS5541_mosi | |
| 445 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 446 | |
| 447 reset_MS5541: | |
| 448 rcall reset_MS5541_one ;0 | |
| 449 rcall reset_MS5541_zero | |
| 450 rcall reset_MS5541_one | |
| 451 rcall reset_MS5541_zero | |
| 452 rcall reset_MS5541_one | |
| 453 rcall reset_MS5541_zero | |
| 454 rcall reset_MS5541_one | |
| 455 rcall reset_MS5541_zero | |
| 456 rcall reset_MS5541_one | |
| 457 rcall reset_MS5541_zero | |
| 458 rcall reset_MS5541_one | |
| 459 rcall reset_MS5541_zero | |
| 460 rcall reset_MS5541_one | |
| 461 rcall reset_MS5541_zero | |
| 462 rcall reset_MS5541_one | |
| 463 rcall reset_MS5541_zero ;15 | |
| 464 rcall reset_MS5541_zero | |
| 465 rcall reset_MS5541_zero | |
| 466 rcall reset_MS5541_zero | |
| 467 rcall reset_MS5541_zero | |
| 468 rcall reset_MS5541_zero ;20 | |
| 469 return | |
| 470 | |
| 471 get_2bytes_MS5541: | |
| 472 movlw d'8' | |
| 473 movwf clock_count | |
| 474 rcall recieve_loop | |
| 475 movff isr1_temp,dMSB | |
| 476 | |
| 477 movlw d'8' | |
| 478 movwf clock_count | |
| 479 rcall recieve_loop | |
| 480 movff isr1_temp,dLSB | |
| 481 bra send_clk_pulse ; Send one high-low sequence on MS5541_clk -> and return | |
| 482 ;return | |
| 483 | |
| 484 recieve_loop: | |
| 485 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 486 btfss MS5541_miso ;MSB first | |
| 487 bcf STATUS,C | |
| 488 btfsc MS5541_miso ;MSB first | |
| 489 bsf STATUS,C | |
| 490 rlcf isr1_temp,F | |
| 491 decfsz clock_count,F | |
| 492 bra recieve_loop | |
| 493 return | |
| 494 | |
| 495 send_clk_pulse: | |
| 496 bsf MS5541_clk | |
| 497 nop | |
| 498 nop | |
| 499 nop | |
| 500 nop | |
|
29
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
501 nop |
|
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
502 nop |
| 0 | 503 bcf MS5541_clk |
| 504 nop | |
| 505 nop | |
|
29
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
506 nop |
|
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
507 nop |
| 0 | 508 return |
| 509 | |
| 510 send_data_MS5541: | |
| 511 movwf clock_count ; From WREG | |
| 512 ; send three startbits first | |
| 513 bcf MS5541_clk | |
|
29
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
514 nop |
|
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
515 nop |
| 0 | 516 bsf MS5541_mosi |
| 517 movlw d'3' | |
| 518 subwf clock_count,F ; total bit counter | |
| 519 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 520 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 521 rcall send_clk_pulse ; Send one high-low sequence on MS5541_clk | |
| 522 ; now send 8 bytes from isr_temp1 and fill-up with zeros | |
| 523 send_data_MS5541_2: | |
| 524 bcf MS5541_clk | |
|
29
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
525 nop |
|
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
526 nop |
| 0 | 527 |
| 528 btfss isr1_temp,7 ;MSB first | |
| 529 bcf MS5541_mosi | |
| 530 btfsc isr1_temp,7 ;MSB first | |
| 531 bsf MS5541_mosi | |
| 532 | |
| 533 bsf MS5541_clk | |
| 534 | |
| 535 bcf STATUS,C | |
| 536 rlcf isr1_temp,F | |
|
29
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
537 nop |
|
50c3e2c7ba7a
adding cardinal (and ordinal) directions for the compass
heinrichsweikamp
parents:
0
diff
changeset
|
538 nop |
| 0 | 539 ; nop |
| 540 ; nop | |
| 541 ; nop | |
| 542 ; nop | |
| 543 ; bcf MS5541_clk | |
| 544 | |
| 545 decfsz clock_count,F | |
| 546 bra send_data_MS5541_2 | |
| 547 bcf MS5541_clk | |
| 548 return | |
| 549 | |
| 550 END |