Mercurial > public > hwos_code
annotate src/i2c.asm @ 632:0347acdf6d8e
changelog updates
| author | heinrichsweikamp |
|---|---|
| date | Sat, 29 Feb 2020 16:57:45 +0100 |
| parents | 185ba2f91f59 |
| children | 4050675965ea |
| rev | line source |
|---|---|
| 0 | 1 ;============================================================================= |
| 2 ; | |
| 631 | 3 ; File i2c.asm combined next generation V3.08.8 |
| 0 | 4 ; |
| 560 | 5 ; I2C Interface |
| 6 ; | |
| 0 | 7 ; Copyright (c) 2012, JD Gascuel, HeinrichsWeikamp, all right reserved. |
| 8 ;============================================================================= | |
| 582 | 9 ; |
| 10 ; Compass0 | |
| 11 ; -------- | |
| 12 ; HMC5883L's read address (8-Bit): 0x3D | |
| 13 ; HMC5883L's write address (8-Bit): 0x3C | |
| 14 ; MMA8452Q's read address (8-Bit): 0x39 | |
| 15 ; MMA8452Q's write address (8-Bit): 0x38 | |
| 16 ; | |
| 17 ; Compass1 | |
| 18 ; -------- | |
| 19 ; LSM303D's read address (8-Bit): 0x3D | |
| 20 ; LSM303D's write address (8-Bit): 0x3C | |
| 21 ; | |
| 22 ; Compass2 | |
| 23 ; -------- | |
| 24 ; LSM303AGR's Compass read address (8-Bit): 0x3D | |
| 25 ; LSM303AGR's Compass write address (8-Bit): 0x3C | |
| 26 ; LSM303AGR's Acceleration read address (8-Bit): 0x33 | |
| 27 ; LSM303AGR's Acceleration write address (8-Bit): 0x32 | |
| 624 | 28 ; |
| 29 ; Compass3 | |
| 30 ; -------- | |
| 628 | 31 ; LSM303C's Compass read address (8-Bit): 0x3D |
| 32 ; LSM303C's Compass write address (8-Bit): 0x3C | |
| 624 | 33 ; LSM303C's Acceleration read address (8-Bit): 0x3B |
| 34 ; LSM303C's Acceleration write address (8-Bit): 0x3A | |
| 582 | 35 ; |
| 36 ; RX Circuity | |
| 37 ; ----------- | |
| 38 ; RX Circuity read address (8-Bit): 0x51 | |
| 39 ; RX Circuity write address (8-Bit): 0x50 | |
| 40 ; | |
| 41 ; | |
| 42 | |
| 0 | 43 ; HISTORY |
| 44 ; 2012-08-22 : [mH] Creation | |
| 565 | 45 ; 2018-02-18 : [mH] Sync with hwOS Sport release |
| 0 | 46 |
| 47 | |
| 582 | 48 #include "hwos.inc" ; Mandatory header |
| 0 | 49 #include "wait.inc" |
| 113 | 50 #include "math.inc" |
| 560 | 51 #include "external_flash.inc" |
| 631 | 52 #include "eeprom_rs232.inc" |
| 113 | 53 |
| 582 | 54 |
| 623 | 55 i2c CODE |
| 582 | 56 |
| 57 ;============================================================================= | |
| 0 | 58 |
| 59 I2C_TX: | |
| 582 | 60 movwf SSP1BUF |
| 61 rcall WaitMSSP | |
| 604 | 62 bra I2C_WaitforACK ; returns... |
| 0 | 63 |
| 604 | 64 I2C_TwoBytesRX_div16: ; get two bytes and divide lo:hi/16 (signed) |
| 65 rcall I2C_OneByteRX ; get one byte | |
| 66 movff SSP1BUF,hi ; data byte | |
| 67 rcall I2C_OneByteRX ; get one byte | |
| 68 movff SSP1BUF,lo ; data byte | |
| 582 | 69 I2C_TwoBytesRX_div16_2: ; divide lo:hi/16 (signed) only |
| 70 bcf STATUS,C | |
| 604 | 71 btfsc hi,7 ; copy sign bit to carry |
| 582 | 72 bsf STATUS,C |
| 73 rrcf hi ; /2 | |
| 74 rrcf lo | |
| 75 I2C_TwoBytesRX_div8_2: ; divide lo:hi/8 (signed) only | |
| 76 bcf STATUS,C | |
| 604 | 77 btfsc hi,7 ; copy sign bit to carry |
| 582 | 78 bsf STATUS,C |
| 79 rrcf hi ; /4 | |
| 80 rrcf lo | |
| 81 bcf STATUS,C | |
| 604 | 82 btfsc hi,7 ; copy sign bit to carry |
| 582 | 83 bsf STATUS,C |
| 84 rrcf hi ; /8 | |
| 85 rrcf lo | |
| 86 bcf STATUS,C | |
| 604 | 87 btfsc hi,7 ; copy sign bit to carry |
| 582 | 88 bsf STATUS,C |
| 89 rrcf hi ; /16 | |
| 90 rrcf lo | |
| 91 return | |
| 0 | 92 |
| 582 | 93 global I2C_RX_accelerometer |
| 0 | 94 I2C_RX_accelerometer: |
| 628 | 95 btfsc compass_type3 ; compass3 ? |
| 96 bra I2C_RX_accelerometer_compass3 ; YES | |
| 604 | 97 btfsc compass_type2 ; compass2 ? |
| 98 bra I2C_RX_accelerometer_compass2 ; YES | |
| 628 | 99 btfsc compass_type1 ; compass1 ? |
| 604 | 100 bra I2C_RX_accelerometer_compass1 ; YES |
| 628 | 101 ;bra I2C_RX_accelerometer_compass0 ; NO - compass0 then |
| 102 | |
| 560 | 103 I2C_RX_accelerometer_compass0: |
| 604 | 104 bsf SSP1CON2,SEN ; start condition |
| 582 | 105 rcall WaitMSSP |
| 106 movlw 0x38 ; address | |
| 107 rcall I2C_TX | |
| 108 movlw 0x00 | |
| 109 rcall I2C_TX | |
| 604 | 110 bsf SSP1CON2,RSEN ; repeated start condition |
| 582 | 111 rcall WaitMSSP |
| 112 movlw 0x39 ; address | |
| 113 rcall I2C_TX | |
| 0 | 114 |
| 604 | 115 rcall I2C_OneByteRX ; get status byte |
| 582 | 116 movf SSP1BUF,W |
| 158 | 117 |
| 582 | 118 ; Non-flipped screen: |
| 119 ; Chip orientation on the PCB requires | |
| 604 | 120 ; Original = corrected |
| 582 | 121 ; x = -x |
| 122 ; y = -y | |
| 123 ; z = -z | |
| 0 | 124 |
| 582 | 125 ; Flipped screen: |
| 126 ; Chip orientation on the PCB requires | |
| 604 | 127 ; Original = corrected |
| 582 | 128 ; x = x |
| 129 ; y = y | |
| 130 ; z = -z | |
|
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|
131 |
| 604 | 132 rcall I2C_TwoBytesRX_div16 ; get two bytes and divide /16 (signed) |
| 623 | 133 btfsc flip_screen ; 180° rotation? |
| 604 | 134 bra I2C_RX_accelerometer2 ; YES |
| 135 comf hi ; 16 bit sign change | |
| 582 | 136 negf lo |
| 623 | 137 btfsc STATUS,C ; carry to propagate? |
| 604 | 138 incf hi,F ; YES - do it |
|
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|
139 I2C_RX_accelerometer2: |
| 623 | 140 MOVII mpr,accel_DX ; copy result |
| 141 rcall I2C_TwoBytesRX_div16 ; get two bytes and divide /16 (signed) | |
| 142 btfsc flip_screen ; 180° rotation? | |
| 143 bra I2C_RX_accelerometer3 ; YES | |
| 144 comf hi ; 16 bit sign change | |
| 582 | 145 negf lo |
| 623 | 146 btfsc STATUS,C ; carry to propagate? |
| 147 incf hi,F ; YES - do it | |
|
166
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BUGFIX: Flip compass with flipped screen, too
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parents:
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diff
changeset
|
148 I2C_RX_accelerometer3: |
| 623 | 149 MOVII mpr,accel_DY ; copy result |
| 150 rcall I2C_OneByteRX ; get one byte | |
| 151 movff SSP1BUF,hi ; data byte | |
| 582 | 152 bsf SSP1CON2, RCEN ; Enable receive mode |
| 153 rcall WaitMSSP | |
| 623 | 154 ; According to data sheet there should be no master Acknowledge for the last byte (accel_DZ+0)... |
| 155 movff SSP1BUF,lo ; data byte | |
| 0 | 156 |
| 582 | 157 rcall I2C_TwoBytesRX_div16_2 ; divide lo:hi/16 (signed) only |
| 623 | 158 comf hi ; 16 bit sign change |
| 582 | 159 negf lo |
| 623 | 160 btfsc STATUS,C ; carry to propagate? |
| 161 incf hi,F ; YES - do it | |
| 162 MOVII mpr,accel_DZ ; copy result | |
| 163 bsf SSP1CON2,PEN ; stop condition | |
| 164 bra WaitMSSP ; ... and return | |
| 0 | 165 |
| 427 | 166 I2C_RX_accelerometer_compass1: |
| 623 | 167 bsf SSP1CON2,SEN ; start condition |
| 582 | 168 rcall WaitMSSP |
| 169 movlw 0x3C ; address | |
| 170 rcall I2C_TX | |
| 171 movlw b'10101000' ; 0x28 with auto-increment (MSB=1) | |
| 172 rcall I2C_TX | |
| 623 | 173 bsf SSP1CON2,RSEN ; repeated start condition (!) |
| 582 | 174 rcall WaitMSSP |
| 175 movlw 0x3D ; address | |
| 628 | 176 I2C_RX_accelerometer_compass1_xx: ; compass 2 and 3 continue here... |
| 582 | 177 rcall I2C_TX |
| 178 | |
| 179 ; Non-flipped screen: | |
| 180 ; Chip orientation on the PCB requires | |
| 181 ; Original = Corrected | |
| 182 ; x = -x (Compass 1) | |
| 183 ; x = x (Compass 2) | |
| 184 ; y = -y | |
| 185 ; z = -z | |
| 186 | |
| 187 ; Flipped screen: | |
| 188 ; Chip orientation on the PCB requires | |
| 189 ; Original = Corrected | |
| 190 ; x = x (Compass 1) | |
| 191 ; x = -x (Compass 2) | |
| 192 ; y = y | |
| 193 ; z = -z | |
| 427 | 194 |
| 582 | 195 ; Dump the accelerator data |
| 196 rcall I2C_OneByteRX | |
| 197 movff SSP1BUF,lo ; accel_DX+0 | |
| 198 rcall I2C_OneByteRX | |
| 623 | 199 movff SSP1BUF,hi ; accel_DX+1 |
| 582 | 200 rcall I2C_TwoBytesRX_div16_2 ; divide lo:hi/16 (signed) only |
| 201 btfss compass_type2 ; compass 2? | |
| 623 | 202 bra I2C_RX_accelerometer1_c1 ; NO - compass 1 |
| 582 | 203 ; compass 2 |
| 623 | 204 btfss flip_screen ; 180° rotation? |
| 205 bra I2C_RX_accelerometer2_c1 ; NO - continue with normal compass1 routines for Y and Z | |
| 582 | 206 ; flipped compass 2, negate x |
| 623 | 207 comf hi ; 16 bit sign change |
| 582 | 208 negf lo |
| 623 | 209 btfsc STATUS,C ; carry to propagate? |
| 210 incf hi,F ; YES - do it | |
| 582 | 211 bra I2C_RX_accelerometer2_c1 ; continue with normal compass1 routines for Y and Z |
| 212 | |
| 213 I2C_RX_accelerometer1_c1: | |
| 623 | 214 btfsc flip_screen ; 180° rotation? |
| 215 bra I2C_RX_accelerometer2_c1 ; YES | |
| 582 | 216 ; non-flipped compass 1, negate x |
| 623 | 217 comf hi ; 16 bit sign change |
| 582 | 218 negf lo |
| 623 | 219 btfsc STATUS,C ; carry to propagate? |
| 220 incf hi,F ; YES - do it | |
| 427 | 221 I2C_RX_accelerometer2_c1: |
| 582 | 222 ; flipped compass 1, non-flipped compass 2 |
| 623 | 223 MOVII mpr,accel_DX ; copy result |
| 582 | 224 rcall I2C_OneByteRX |
| 225 movff SSP1BUF,lo ; accel_DY+0 | |
| 226 rcall I2C_OneByteRX | |
| 227 movff SSP1BUF,hi ; accel_DY+1 | |
| 228 | |
| 229 rcall I2C_TwoBytesRX_div16_2 ; divide lo:hi/16 (signed) only | |
| 623 | 230 btfsc flip_screen ; 180° rotation? |
| 231 bra I2C_RX_accelerometer3_c1 ; YES | |
| 232 comf hi ; 16 bit sign change | |
| 582 | 233 negf lo |
| 623 | 234 btfsc STATUS,C ; carry to propagate? |
| 235 incf hi,F ; YES - do it | |
| 427 | 236 I2C_RX_accelerometer3_c1: |
| 623 | 237 MOVII mpr,accel_DY ; copy result |
| 582 | 238 rcall I2C_OneByteRX |
| 623 | 239 movff SSP1BUF,lo ; accel_DZ+0 |
| 582 | 240 bsf SSP1CON2, RCEN ; Enable receive mode |
| 241 rcall WaitMSSP | |
| 623 | 242 ; According to data sheet there should be no master Acknowledge for the last byte (accel_DZ+1)... |
| 243 movff SSP1BUF,hi ; accel_DZ+1 | |
| 244 bsf SSP1CON2,PEN ; stop condition | |
| 582 | 245 rcall WaitMSSP |
| 246 rcall I2C_TwoBytesRX_div16_2 ; divide lo:hi/16 (signed) only | |
| 623 | 247 comf hi ; 16 bit sign change for Z |
| 582 | 248 negf lo |
| 623 | 249 btfsc STATUS,C ; carry to propagate? |
| 250 incf hi,F ; YES - do it | |
| 251 MOVII mpr,accel_DZ ; copy result | |
| 582 | 252 return |
| 253 | |
| 560 | 254 I2C_RX_accelerometer_compass2: |
| 623 | 255 bsf SSP1CON2,SEN ; start condition |
| 582 | 256 rcall WaitMSSP |
| 257 movlw 0x32 ; address | |
| 258 rcall I2C_TX | |
| 259 movlw b'10101000' ; 0x28 with auto-increment (MSB=1) | |
| 260 rcall I2C_TX | |
| 623 | 261 bsf SSP1CON2,RSEN ; repeated start condition (!) |
| 582 | 262 rcall WaitMSSP |
| 263 movlw 0x33 ; address | |
| 628 | 264 bra I2C_RX_accelerometer_compass1_xx |
| 624 | 265 |
| 266 I2C_RX_accelerometer_compass3: | |
| 628 | 267 bsf SSP1CON2,SEN ; start condition |
| 624 | 268 rcall WaitMSSP |
| 628 | 269 movlw 0x3A ; address |
| 270 rcall I2C_TX | |
| 271 movlw 0x28 ; 0x28 (OUT_X_L_A) | |
| 272 rcall I2C_TX | |
| 273 bsf SSP1CON2,RSEN ; repeated start condition (!) | |
| 624 | 274 rcall WaitMSSP |
| 628 | 275 movlw 0x3B ; address |
| 276 bra I2C_RX_accelerometer_compass1_xx | |
| 582 | 277 |
| 0 | 278 I2C_OneByteRX: |
| 623 | 279 bsf SSP1CON2,RCEN ; enable receive mode |
| 582 | 280 rcall WaitMSSP |
| 623 | 281 bsf SSP1CON2,ACKEN ; master acknowledge |
| 282 bra WaitMSSP ; ... and return | |
| 283 | |
| 284 | |
| 285 ;----------------------------------------------------------------------------- | |
| 286 IFDEF _compass | |
| 0 | 287 |
| 582 | 288 global I2C_RX_compass |
| 0 | 289 I2C_RX_compass: |
| 628 | 290 btfsc compass_type3 ; compass 3 ? |
| 291 bra I2C_RX_compass3 ; YES | |
| 292 btfsc compass_type2 ; compass 2 ? | |
| 623 | 293 bra I2C_RX_compass2 ; YES |
| 628 | 294 btfsc compass_type1 ; compass 1 ? |
| 623 | 295 bra I2C_RX_compass1 ; YES |
| 628 | 296 ;bra I2C_RX_compass0 ; NO - compass 0 then |
| 297 | |
| 560 | 298 I2C_RX_compass0: |
| 623 | 299 bsf SSP1CON2,SEN ; start condition |
| 582 | 300 rcall WaitMSSP |
| 301 movlw 0x3C ; address | |
| 302 rcall I2C_TX | |
| 303 movlw 0x03 | |
| 304 rcall I2C_TX | |
| 623 | 305 bsf SSP1CON2,PEN ; stop condition |
| 582 | 306 rcall WaitMSSP |
| 0 | 307 |
| 582 | 308 bcf PIR1,SSP1IF |
| 623 | 309 bsf SSP1CON2,SEN ; start condition |
| 582 | 310 rcall WaitMSSP |
| 311 movlw 0x3D ; address | |
| 312 rcall I2C_TX | |
| 0 | 313 |
| 582 | 314 ; Compass IC sends data in following order: |
| 315 ; x MSB | |
| 316 ; x LSB | |
| 317 ; z MSB | |
| 318 ; z LSB | |
| 319 ; y MSB | |
| 320 ; y LSB | |
| 0 | 321 |
| 582 | 322 ; Non-flipped screen |
| 323 ; Chip orientation on the PCB requires | |
| 324 ; Original = Corrected | |
| 325 ; x = -y | |
| 326 ; z = z | |
| 327 ; y = x | |
| 0 | 328 |
| 582 | 329 ; Flipped screen |
| 330 ; Chip orientation on the PCB requires | |
| 331 ; Original = Corrected | |
| 332 ; x = y | |
| 333 ; z = z | |
| 334 ; y = -x | |
|
166
30ebaf72170d
BUGFIX: Flip compass with flipped screen, too
heinrichsweikamp
parents:
158
diff
changeset
|
335 |
| 623 | 336 rcall I2C_OneByteRX ; get one byte |
| 337 movff SSP1BUF,compass_DY+1 ; data byte | |
| 338 rcall I2C_OneByteRX ; get one byte | |
| 339 movff SSP1BUF,compass_DY+0 ; data byte | |
| 340 btfsc flip_screen ; 180° rotation? | |
| 341 bra I2C_RX_compass0_2 ; NO | |
| 342 banksel compass_DY ; YES - flip Y | |
| 343 comf compass_DY+1 ; - 16 bit sign change | |
| 582 | 344 negf compass_DY+0 |
| 623 | 345 btfsc STATUS,C ; - carry to propagate? |
| 346 incf compass_DY+1,F ; YES - do it | |
| 582 | 347 banksel common |
| 623 | 348 I2C_RX_compass0_2: |
| 349 rcall I2C_OneByteRX ; get one byte | |
| 350 movff SSP1BUF,compass_DZ+1 ; data byte | |
| 351 rcall I2C_OneByteRX ; get one byte | |
| 352 movff SSP1BUF,compass_DZ+0 ; data byte | |
| 353 rcall I2C_OneByteRX ; get one byte | |
| 354 movff SSP1BUF,compass_DX+1 ; data byte | |
| 628 | 355 bsf SSP1CON2,RCEN ; enable receive mode |
| 582 | 356 rcall WaitMSSP |
| 623 | 357 movff SSP1BUF,compass_DX+0 ; data byte |
| 358 bsf SSP1CON2,PEN ; stop condition | |
| 582 | 359 rcall WaitMSSP |
| 623 | 360 btfss flip_screen ; 180° rotation? |
| 361 return ; NO - done | |
| 362 banksel compass_DX ; YES - flip X | |
| 363 comf compass_DX+1 ; - 16 bit sign change | |
| 582 | 364 negf compass_DX+0 |
| 623 | 365 btfsc STATUS,C ; - carry to propagate? |
| 366 incf compass_DX+1,F ; YES - do it | |
| 582 | 367 banksel common |
| 368 return | |
| 369 | |
| 628 | 370 I2C_RX_compass1: ; compass type 1 |
| 623 | 371 bsf SSP1CON2,SEN ; start condition |
| 582 | 372 rcall WaitMSSP |
| 373 movlw 0x3C ; address | |
| 374 rcall I2C_TX | |
| 375 movlw b'10001000' ; 0x08 with auto-increment (MSB=1) | |
| 376 rcall I2C_TX | |
| 623 | 377 bsf SSP1CON2,RSEN ; repeated start condition (!) |
| 582 | 378 rcall WaitMSSP |
| 379 movlw 0x3D ; address | |
| 380 rcall I2C_TX | |
| 623 | 381 ;rcall WaitMSSP ; TODO needed? (mH) |
| 382 rcall I2C_OneByteRX ; get one byte | |
| 383 movff SSP1BUF,lo ; data byte | |
| 384 rcall I2C_OneByteRX ; get one byte | |
| 385 movff SSP1BUF,hi ; data byte | |
| 582 | 386 rcall I2C_TwoBytesRX_div8_2 |
| 623 | 387 MOVII mpr,compass_DX |
| 388 btfss flip_screen ; 180° rotation? | |
| 389 bra I2C_RX_compass1_1 ; NO | |
| 390 banksel compass_DX ; YES - flip X | |
| 391 comf compass_DX+1 ; - 16 bit sign change | |
| 582 | 392 negf compass_DX+0 |
| 623 | 393 btfsc STATUS,C ; - carry to propagate? |
| 394 incf compass_DX+1,F ; YES - do it | |
| 582 | 395 banksel common |
| 427 | 396 I2C_RX_compass1_1: |
| 623 | 397 rcall I2C_OneByteRX ; get one byte |
| 398 movff SSP1BUF,lo ; data byte | |
| 399 rcall I2C_OneByteRX ; get one byte | |
| 400 movff SSP1BUF,hi ; data byte | |
| 582 | 401 rcall I2C_TwoBytesRX_div8_2 |
| 623 | 402 MOVII mpr,compass_DY |
| 403 btfss flip_screen ; 180° rotation? | |
| 404 bra I2C_RX_compass1_2 ; NO | |
| 405 banksel compass_DY ; YES - flip Y | |
| 406 comf compass_DY+1 ; - 16 bit sign change | |
| 582 | 407 negf compass_DY+0 |
| 623 | 408 btfsc STATUS,C ; - carry to propagate? |
| 409 incf compass_DY+1,F ; YES - do it | |
| 410 banksel common | |
| 427 | 411 I2C_RX_compass1_2: |
| 623 | 412 rcall I2C_OneByteRX ; get one byte |
| 413 movff SSP1BUF,lo ; data byte | |
| 582 | 414 bsf SSP1CON2, RCEN ; Enable receive mode |
| 415 rcall WaitMSSP | |
| 623 | 416 movff SSP1BUF,hi ; data byte |
| 582 | 417 rcall I2C_TwoBytesRX_div8_2 |
| 623 | 418 MOVII mpr,compass_DZ |
| 419 bsf SSP1CON2,PEN ; stop condition | |
| 420 bra WaitMSSP ; ... and return | |
| 560 | 421 |
| 628 | 422 I2C_RX_compass2: ; compass type 2 |
| 623 | 423 bsf SSP1CON2,SEN ; start condition |
| 582 | 424 rcall WaitMSSP |
| 425 movlw 0x3C ; address | |
| 426 rcall I2C_TX | |
| 427 movlw 0xE8 ; 0x68 with auto-increment (MSB=1) | |
| 428 rcall I2C_TX | |
| 623 | 429 bsf SSP1CON2,RSEN ; repeated start condition (!) |
| 582 | 430 rcall WaitMSSP |
| 431 movlw 0x3D ; address | |
| 432 rcall I2C_TX | |
| 628 | 433 I2C_RX_compass2_xx: ; compass 3 joins in here |
| 582 | 434 ; rcall WaitMSSP |
| 623 | 435 rcall I2C_OneByteRX ; get one byte |
| 436 movff SSP1BUF,lo ; data byte | |
| 437 rcall I2C_OneByteRX ; get one byte | |
| 438 movff SSP1BUF,hi ; data byte | |
| 582 | 439 ; rcall I2C_TwoBytesRX_div8_2 |
| 623 | 440 btfsc flip_screen ; 180° rotation? |
| 441 bra I2C_RX_compass2_1 ; YES - do nothing with X | |
| 442 ; NO - flip X | |
| 443 comf hi ; - 16 bit sign change | |
| 582 | 444 negf lo |
| 623 | 445 btfsc STATUS,C ; - carry to propagate? |
| 446 incf hi,F ; YES - do it | |
| 582 | 447 I2C_RX_compass2_1: |
| 623 | 448 MOVII mpr,compass_DX |
| 449 rcall I2C_OneByteRX ; get one byte | |
| 450 movff SSP1BUF,lo ; data byte | |
| 451 rcall I2C_OneByteRX ; get one byte | |
| 452 movff SSP1BUF,hi ; data byte | |
| 582 | 453 ; rcall I2C_TwoBytesRX_div8_2 |
| 623 | 454 btfss flip_screen ; 180° rotation? |
| 455 bra I2C_RX_compass2_2 ; NO - do nothing with Y | |
| 456 ; YES - flip Y | |
| 457 comf hi ; - 16 bit sign change | |
| 582 | 458 negf lo |
| 623 | 459 btfsc STATUS,C ; - carry to propagate? |
| 460 incf hi,F ; YES - do it | |
| 461 I2C_RX_compass2_2: | |
| 462 MOVII mpr,compass_DY | |
| 463 rcall I2C_OneByteRX ; get one byte | |
| 464 movff SSP1BUF,lo ; data byte | |
| 465 rcall I2C_OneByteRX ; get one byte | |
| 466 movff SSP1BUF,hi ; data byte | |
| 582 | 467 ; rcall I2C_TwoBytesRX_div8_2 |
| 623 | 468 MOVII mpr,compass_DZ |
| 469 bsf SSP1CON2,PEN ; stop condition | |
| 628 | 470 bra WaitMSSP ; ...and return |
| 582 | 471 |
| 628 | 472 I2C_RX_compass3: ; compass type 3 |
| 473 bsf SSP1CON2,SEN ; start condition | |
| 624 | 474 rcall WaitMSSP |
| 628 | 475 movlw 0x3C ; address |
| 476 rcall I2C_TX | |
| 477 movlw 0xA8 ; 0x28 with auto-increment (MSB=1) | |
| 478 rcall I2C_TX | |
| 479 bsf SSP1CON2,RSEN ; repeated start condition (!) | |
| 624 | 480 rcall WaitMSSP |
| 628 | 481 movlw 0x3D ; address |
| 482 rcall I2C_TX | |
| 483 bra I2C_RX_compass2_xx ; join with compass 2 code | |
| 624 | 484 |
| 623 | 485 ENDIF ; _compass |
| 486 | |
| 487 ;----------------------------------------------------------------------------- | |
| 582 | 488 |
| 489 global I2C_init_compass | |
| 0 | 490 I2C_init_compass: |
| 582 | 491 bsf compass_enabled |
| 492 bcf compass_type2 | |
| 628 | 493 bcf compass_type3 |
| 623 | 494 |
| 628 | 495 ; probe for compass 3 |
| 623 | 496 bsf SSP1CON2,SEN ; start condition |
| 582 | 497 rcall WaitMSSP |
| 628 | 498 movlw 0x3A ; address byte + write bit |
| 582 | 499 movwf SSP1BUF ; control byte |
| 500 rcall WaitMSSP | |
| 501 btfss SSP1CON2,ACKSTAT ; ACK? | |
| 628 | 502 bsf compass_type3 ; YES - ACK was send, compass 3 present |
| 503 bsf SSP1CON2,PEN ; stop condition | |
| 504 rcall WaitMSSP | |
| 505 | |
| 506 btfsc compass_type3 ; compass 3 found? | |
| 507 bra I2C_init_compass3 ; YES - initialize compass 3 | |
| 508 | |
| 509 ; probe for compass 2 | |
| 510 bsf SSP1CON2,SEN ; start condition | |
| 582 | 511 rcall WaitMSSP |
| 628 | 512 movlw 0x32 ; address byte + write bit |
| 513 movwf SSP1BUF ; control byte | |
| 514 rcall WaitMSSP | |
| 515 btfss SSP1CON2,ACKSTAT ; ACK? | |
| 516 bsf compass_type2 ; YES - ACK send, compass 2 present | |
| 517 bsf SSP1CON2,PEN ; stop condition | |
| 518 rcall WaitMSSP | |
| 623 | 519 |
| 628 | 520 btfsc compass_type2 ; compass 2 found? |
| 521 bra I2C_init_compass2 ; YES - initialize compass 2 | |
| 522 | |
| 523 ; probe for compass 0 or 1 | |
| 524 bsf compass_type1 ; set flag | |
| 623 | 525 bsf SSP1CON2,SEN ; start condition |
| 582 | 526 rcall WaitMSSP |
| 527 movlw 0x3C ; address | |
| 528 rcall I2C_TX | |
| 529 movlw 0x0F | |
| 530 rcall I2C_TX | |
| 623 | 531 bsf SSP1CON2,PEN ; stop condition |
| 532 rcall WaitMSSP | |
| 582 | 533 bcf PIR1,SSP1IF |
| 623 | 534 bsf SSP1CON2,SEN ; start condition |
| 582 | 535 rcall WaitMSSP |
| 536 movlw 0x3D ; address | |
| 537 rcall I2C_TX | |
| 623 | 538 rcall I2C_OneByteRX ; get one byte |
| 628 | 539 movlw 0x49 ; 0x49 = compass 1 |
| 582 | 540 cpfseq SSP1BUF |
| 628 | 541 bcf compass_type1 ; clear flag |
| 623 | 542 bsf SSP1CON2,PEN ; stop condition |
| 582 | 543 rcall WaitMSSP |
| 544 | |
| 628 | 545 btfsc compass_type1 ; compass 1 found? |
| 546 bra I2C_init_compass1 ; YES - initialize compass 1 | |
| 547 ;bra I2C_init_compass0 ; NO - must be compass 0 then | |
| 548 | |
| 549 I2C_init_compass0: | |
| 550 ; magnetic | |
| 623 | 551 bsf SSP1CON2,SEN ; start condition |
| 582 | 552 rcall WaitMSSP |
| 553 movlw 0x3C ; address | |
| 554 rcall I2C_TX | |
| 555 movlw 0x00 | |
| 556 rcall I2C_TX | |
| 623 | 557 movlw b'01101000' ; ConfigA: 3 Hz, 8 samples averaged |
| 582 | 558 rcall I2C_TX |
| 623 | 559 movff opt_compass_gain,i2c_temp1 ; 0-7 (230 LSB/Gauss to 1370 LSB/Gauss) |
| 582 | 560 swapf i2c_temp1,F |
| 561 comf i2c_temp1,F | |
| 562 bcf STATUS,C | |
| 563 rlcf i2c_temp1 | |
| 564 movf i2c_temp1,W | |
| 565 clrf i2c_temp1 | |
| 566 rcall I2C_TX | |
| 623 | 567 movlw b'00000000' ; continuous mode |
| 582 | 568 rcall I2C_TX |
| 623 | 569 bsf SSP1CON2,PEN ; stop condition |
| 628 | 570 rcall WaitMSSP |
| 571 | |
| 572 ; accelerometer | |
| 631 | 573 rcall I2C_sleep_accelerometer0 ; registers can only be changed in standby mode |
| 628 | 574 |
| 575 bsf SSP1CON2,SEN ; start condition | |
| 576 rcall WaitMSSP | |
| 577 movlw 0x38 ; address | |
| 578 rcall I2C_TX | |
| 579 movlw 0x0E ; XYZ_DATA_CFG | |
| 580 rcall I2C_TX | |
| 581 movlw b'00000000' ; high pass filter = 0, +/- 2 g range | |
| 582 rcall I2C_TX | |
| 583 bsf SSP1CON2,PEN ; stop condition | |
| 584 rcall WaitMSSP | |
| 585 bsf SSP1CON2,SEN ; start condition | |
| 586 rcall WaitMSSP | |
| 587 movlw 0x38 ; address | |
| 588 rcall I2C_TX | |
| 589 movlw 0x2A ; CTRL_REG1 | |
| 590 rcall I2C_TX | |
| 591 ; movlw b'00110000' ; CTRL_REG1: 160 ms data rate, standby mode | |
| 592 movlw b'00110100' ; CTRL_REG1: 160 ms data rate, standby mode, reduced noise mode | |
| 593 rcall I2C_TX | |
| 594 movlw b'00000010' ; CTRL_REG2: high-res in active mode | |
| 595 rcall I2C_TX | |
| 596 bsf SSP1CON2,PEN ; stop condition | |
| 597 rcall WaitMSSP | |
| 598 | |
| 599 bsf SSP1CON2,SEN ; start condition | |
| 600 rcall WaitMSSP | |
| 601 movlw 0x38 ; address | |
| 602 rcall I2C_TX | |
| 603 movlw 0x2A ; CTRL_REG1 | |
| 604 rcall I2C_TX | |
| 605 ; movlw b'00110001' ; CTRL_REG1: 160 ms data rate, active mode | |
| 606 movlw b'00110101' ; CTRL_REG1: 160 ms data rate, standby mode, reduced noise mode, active Mode | |
| 607 rcall I2C_TX | |
| 608 bsf SSP1CON2,PEN ; stop condition | |
| 623 | 609 bra WaitMSSP ; ... and return |
| 0 | 610 |
| 628 | 611 |
| 427 | 612 I2C_init_compass1: |
| 623 | 613 bsf SSP1CON2,SEN ; start condition |
| 582 | 614 rcall WaitMSSP |
| 615 movlw 0x3C ; address | |
| 616 rcall I2C_TX | |
| 617 movlw 0x9F ; 1F with auto-increment (MSB=1) | |
| 618 rcall I2C_TX | |
| 619 movlw b'00000000' ; CTRL0 | |
| 620 rcall I2C_TX | |
| 623 | 621 movlw b'00101111' ; CTRL1 (6.25 Hz, BDU=0, x,y,z = ON) |
| 582 | 622 rcall I2C_TX |
| 623 | 623 movlw b'11000000' ; CTRL2 (50 Hz, +/- 2g) |
| 582 | 624 rcall I2C_TX |
| 625 movlw b'00000000' ; CTRL3 | |
| 626 rcall I2C_TX | |
| 627 movlw b'00000000' ; CTRL4 | |
| 628 rcall I2C_TX | |
| 623 | 629 movlw b'01100100' ; CTRL5 HIGH res, 6.25 Hz |
| 582 | 630 rcall I2C_TX |
| 623 | 631 movff opt_compass_gain,i2c_temp1 ; 0-7 (230 LSB/Gauss to 1370 LSB/Gauss) |
| 632 movlw b'01100000' ; CTRL6 Full scale (+/-12 Gauss -> 2730 LSB/Gauss) | |
| 582 | 633 dcfsnz i2c_temp1,F ; = 1? |
| 623 | 634 movlw b'01100000' ; YES - CTRL6 Full scale (+/-12 Gauss -> 2730 LSB/Gauss) |
| 582 | 635 dcfsnz i2c_temp1,F ; = 2? |
| 623 | 636 movlw b'01000000' ; YES - CTRL6 (+/-8 Gauss) |
| 582 | 637 dcfsnz i2c_temp1,F ; = 3? |
| 623 | 638 movlw b'01000000' ; YES - CTRL6 (+/-8 Gauss) |
| 582 | 639 dcfsnz i2c_temp1,F ; = 4? |
| 623 | 640 movlw b'00100000' ; YES - CTRL6 (+/-4 Gauss) |
| 582 | 641 dcfsnz i2c_temp1,F ; = 5? |
| 623 | 642 movlw b'00100000' ; YES - CTRL6 (+/-4 Gauss) |
| 582 | 643 dcfsnz i2c_temp1,F ; = 6? |
| 623 | 644 movlw b'00000000' ; YES - CTRL6 (+/-2 Gauss) |
| 582 | 645 dcfsnz i2c_temp1,F ; = 7? |
| 623 | 646 movlw b'00000000' ; YES - CTRL6 (+/-2 Gauss) |
| 582 | 647 rcall I2C_TX |
| 648 movlw b'00000000' ; CTRL7 Continuous Mode | |
| 649 rcall I2C_TX | |
| 623 | 650 bsf SSP1CON2,PEN ; stop condition |
| 628 | 651 bra WaitMSSP ; (and return), no I2C_init_accelerometer1 needed (inits with magnetic sensor) |
| 582 | 652 |
| 560 | 653 I2C_init_compass2: |
| 628 | 654 ; magnetic |
| 655 bsf SSP1CON2,SEN ; Start condition | |
| 656 rcall WaitMSSP | |
| 657 movlw 0x3C ; address | |
| 658 rcall I2C_TX | |
| 659 movlw 0xE0 ; 0x60 with auto-increment (MSB=1) | |
| 660 rcall I2C_TX | |
| 661 movlw b'10000000' ; CFG_REG_A_M (10Hz, Continuous) 0x60 0x00 | |
| 662 rcall I2C_TX | |
| 663 movlw b'00000011' ; CFG_REG_B_M (low-pass filter enabled) 0x61 (set pulse is released every 63 ODR) | |
| 664 rcall I2C_TX | |
| 665 movlw b'00010000' ; CFG_REG_C_M BDU=1 0x62 0x57 | |
| 666 rcall I2C_TX | |
| 667 bsf SSP1CON2,PEN ; Stop condition | |
| 668 rcall WaitMSSP | |
| 669 | |
| 670 ; accelerometer | |
| 623 | 671 bsf SSP1CON2,SEN ; start condition |
| 672 rcall WaitMSSP | |
| 628 | 673 movlw 0x32 ; address |
| 674 rcall I2C_TX | |
| 675 movlw 0x9F ; 1F with auto-increment (MSB=1) | |
| 623 | 676 rcall I2C_TX |
| 628 | 677 movlw b'00000000' ; TEMP_CFG_REG_A (Temp sensor off) |
| 678 rcall I2C_TX | |
| 679 movlw b'00100111' ; CTRL_REG1_A (10Hz, x,y,z = ON) | |
| 623 | 680 rcall I2C_TX |
| 628 | 681 movlw b'00000000' ; CTRL_REG2_A |
| 682 rcall I2C_TX | |
| 683 movlw b'00000000' ; CTRL_REG3_A | |
| 623 | 684 rcall I2C_TX |
| 628 | 685 movlw b'00001000' ; CTRL_REG4_A (BDU=0, +/-2g, HR=1) |
| 623 | 686 rcall I2C_TX |
| 628 | 687 ; movlw b'00000000' ; CTRL_REG5_A |
| 688 ; rcall I2C_TX | |
| 623 | 689 bsf SSP1CON2,PEN ; stop condition |
| 690 bra WaitMSSP ; ... and return | |
| 582 | 691 |
| 628 | 692 |
| 624 | 693 I2C_init_compass3: |
| 628 | 694 ; magnetic |
| 631 | 695 bsf SSP1CON2,SEN ; start condition |
| 624 | 696 rcall WaitMSSP |
| 631 | 697 movlw 0x3C ; address |
| 698 rcall I2C_TX | |
| 699 movlw 0xA0 ; 0x20 with auto-increment (MSB=1) | |
| 700 rcall I2C_TX | |
| 701 movlw b'01110000' ; CTRL_REG1_M (10Hz) 0x20 | |
| 702 rcall I2C_TX | |
| 703 movlw b'01100000' ; CTRL_REG2_M (Full-scale: +/- 16gauss) 0x21 | |
| 704 rcall I2C_TX | |
| 705 movlw b'01000000' ; CTRL_REG3_M (Continuous) 0x22 | |
| 706 rcall I2C_TX | |
| 707 movlw b'00000000' ; CTRL_REG4_M (Z in Low-power mode) 0x23 | |
| 708 rcall I2C_TX | |
| 709 movlw b'00000000' ; CTRL_REG5_M 0x24 | |
| 710 rcall I2C_TX | |
| 711 movlw b'00000000' ; CTRL_REG5_M 0x24 | |
| 712 rcall I2C_TX | |
| 713 bsf SSP1CON2,PEN ; Stop condition | |
| 628 | 714 rcall WaitMSSP |
| 631 | 715 |
| 628 | 716 ;accelerometer |
| 631 | 717 bsf SSP1CON2,SEN ; start condition |
| 718 rcall WaitMSSP | |
| 719 movlw 0x3A ; address | |
| 628 | 720 rcall I2C_TX |
| 721 movlw 0x20 | |
| 631 | 722 rcall I2C_TX |
| 723 movlw b'10010111' ; CTRL_REG1_A (100Hz, x,y,z = ON, BDU=OFF) 0x20 | |
| 724 rcall I2C_TX | |
| 725 movlw b'00000000' ; CTRL_REG2_A 0x21 | |
| 726 rcall I2C_TX | |
| 727 movlw b'00000000' ; CTRL_REG3_A 0x22 | |
| 728 rcall I2C_TX | |
| 729 movlw b'11001100' ; CTRL_REG4_A 0x23 | |
| 730 rcall I2C_TX | |
| 731 bsf SSP1CON2,PEN ; stop condition | |
| 732 bra WaitMSSP ; (and return) | |
| 628 | 733 |
| 582 | 734 |
| 735 global I2C_sleep_compass | |
| 0 | 736 I2C_sleep_compass: |
| 628 | 737 btfss compass_enabled ; compass active? |
| 631 | 738 return ; NO - return |
| 623 | 739 bcf compass_enabled |
| 628 | 740 btfsc compass_type3 ; compass 3 ? |
| 624 | 741 bra I2C_sleep_compass3 ; YES |
| 628 | 742 btfsc compass_type2 ; compass 2 ? |
| 623 | 743 bra I2C_sleep_compass2 ; YES |
| 628 | 744 btfsc compass_type1 ; compass 1 ? |
| 623 | 745 bra I2C_sleep_compass1 ; YES |
| 628 | 746 ;bra I2C_sleep_compass0 ; NO - must be compass 0 then |
| 747 | |
| 560 | 748 I2C_sleep_compass0: |
| 628 | 749 ; magnetic |
| 623 | 750 bsf SSP1CON2,SEN ; start condition |
| 582 | 751 rcall WaitMSSP |
| 752 movlw 0x3C ; address | |
| 753 rcall I2C_TX | |
| 754 movlw 0x00 | |
| 755 rcall I2C_TX | |
| 756 movlw b'01101000' ; ConfigA | |
| 757 rcall I2C_TX | |
| 758 movlw b'00100000' ; ConfigB | |
| 759 rcall I2C_TX | |
| 623 | 760 movlw b'00000010' ; idle mode |
| 582 | 761 rcall I2C_TX |
| 623 | 762 bsf SSP1CON2,PEN ; stop condition |
| 628 | 763 rcall WaitMSSP |
| 631 | 764 |
| 628 | 765 I2C_sleep_accelerometer0: ;(needed) |
| 766 ; accelerometer | |
| 767 bsf SSP1CON2,SEN ; start condition | |
| 768 rcall WaitMSSP | |
| 769 movlw 0x38 ; address | |
| 770 rcall I2C_TX | |
| 771 movlw 0x2A ; CTRL_REG1 | |
| 772 rcall I2C_TX | |
| 773 movlw b'00000000' ; standby mode | |
| 774 rcall I2C_TX | |
| 775 bsf SSP1CON2,PEN ; stop condition | |
| 623 | 776 bra WaitMSSP ; ... and return |
| 0 | 777 |
| 427 | 778 I2C_sleep_compass1: |
| 623 | 779 bsf SSP1CON2,SEN ; start condition |
| 582 | 780 rcall WaitMSSP |
| 781 movlw 0x3C ; address | |
| 782 rcall I2C_TX | |
| 783 movlw 0x20 ; CTRL_REG1 | |
| 784 rcall I2C_TX | |
| 623 | 785 movlw b'00000000' ; data for CTRL_REG1: acceleration sensor power-down mode |
| 582 | 786 rcall I2C_TX |
| 623 | 787 bsf SSP1CON2,PEN ; stop condition |
| 582 | 788 rcall WaitMSSP |
| 623 | 789 bsf SSP1CON2,SEN ; start condition |
| 582 | 790 rcall WaitMSSP |
| 791 movlw 0x3C ; address | |
| 792 rcall I2C_TX | |
| 793 movlw 0x26 ; CTRL_REG7 | |
| 794 rcall I2C_TX | |
| 623 | 795 movlw b'00000010' ; data for CTRL_REG7: magnetic sensor power-down mode |
| 582 | 796 rcall I2C_TX |
| 623 | 797 bsf SSP1CON2,PEN ; stop condition |
| 631 | 798 bra WaitMSSP ; (And return) - no I2C_sleep_accelerometer1 required (sleeps with magnetic sensor) |
| 799 | |
| 560 | 800 |
| 801 I2C_sleep_compass2: | |
| 623 | 802 ; magnetic |
| 803 bsf SSP1CON2,SEN ; start condition | |
| 804 rcall WaitMSSP | |
| 805 movlw 0x3C ; address | |
| 806 rcall I2C_TX | |
| 807 movlw 0xE0 ; 0x60 with auto-increment (MSB=1) | |
| 808 rcall I2C_TX | |
| 809 movlw b'00000011' ; CFG_REG_A_M 0x60 (idle mode)) | |
| 810 rcall I2C_TX | |
| 811 movlw b'00000100' ; CFG_REG_B_M 0x61 (set pulse is released only at power-on after PD condition) | |
| 812 rcall I2C_TX | |
| 813 movlw b'01010001' ; CFG_REG_C_M 0x62 | |
| 814 rcall I2C_TX | |
| 815 movlw b'00000000' ; INT_CTRL_REG_M 0x63 | |
| 816 rcall I2C_TX | |
| 817 bsf SSP1CON2,PEN ; stop condition | |
| 628 | 818 rcall WaitMSSP |
| 582 | 819 |
| 623 | 820 ; accelerometer |
| 821 bsf SSP1CON2,SEN ; start condition | |
| 822 rcall WaitMSSP | |
| 823 movlw 0x32 ; address | |
| 824 rcall I2C_TX | |
| 825 movlw 0x9F ; 1F with auto-increment (MSB=1) | |
| 826 rcall I2C_TX | |
| 827 movlw b'00000000' ; TEMP_CFG_REG_A 0x1F (temp sensor off) | |
| 828 rcall I2C_TX | |
| 829 movlw b'00000000' ; CTRL_REG1_A 0x20 (all off) | |
| 830 rcall I2C_TX | |
| 831 bsf SSP1CON2,PEN ; stop condition | |
| 832 bra WaitMSSP ; ... and return | |
| 833 | |
| 628 | 834 I2C_sleep_compass3: |
| 835 ; magnetic | |
| 836 bsf SSP1CON2,SEN ; start condition | |
| 624 | 837 rcall WaitMSSP |
| 628 | 838 movlw 0x3C ; address |
| 839 rcall I2C_TX | |
| 840 movlw 0xA2 ; 0x22 with auto-increment (MSB=1) | |
| 841 rcall I2C_TX | |
| 842 movlw b'01000010' ; CTRL_REG3_M (power-down) 0x22 | |
| 843 rcall I2C_TX | |
| 844 bsf SSP1CON2,PEN ; stop condition | |
| 845 rcall WaitMSSP | |
| 846 | |
| 847 ; accelerometer | |
| 848 bsf SSP1CON2,SEN ; start condition | |
| 849 rcall WaitMSSP | |
| 850 movlw 0x3A ; address | |
| 851 rcall I2C_TX | |
| 624 | 852 movlw 0x20 |
| 628 | 853 rcall I2C_TX |
| 854 movlw b'00000000' ; CTRL_REG1_A (100Hz, x,y,z = OFF) 0x20 | |
| 855 rcall I2C_TX | |
| 856 bsf SSP1CON2,PEN ; stop condition | |
| 631 | 857 bra WaitMSSP ; ... and return |
| 0 | 858 |
| 615 | 859 WaitMSSP: |
| 860 decfsz i2c_temp1,F ; check for timeout during I2C action | |
| 861 bra WaitMSSP2 | |
| 862 bra I2CFail ; timeout occurred | |
| 863 WaitMSSP2: | |
| 864 btfss PIR1,SSP1IF | |
| 865 bra WaitMSSP | |
| 866 clrf i2c_temp1 | |
| 867 bcf PIR1,SSP1IF | |
| 868 return | |
| 869 | |
| 870 I2C_WaitforACK: | |
| 628 | 871 btfss SSP1CON2,ACKSTAT ; ACK received from slave? |
| 872 return ; YES | |
| 873 I2CFail: ; NO | |
| 874 bsf active_reset_ostc_rx ; - reset RX circuitry (which may be the cause for the hang up) | |
| 875 rcall I2CReset ; - reset I2C | |
| 876 bcf PIR1,SSP1IF ; - | |
| 877 clrf i2c_temp1 ; - | |
| 878 bsf i2c_error_flag ; - set error flag | |
| 879 bcf active_reset_ostc_rx ; - release reset from RX circuitry | |
| 880 return ; - done | |
| 615 | 881 |
| 882 I2CReset: ; something went wrong (slave holds SDA low?) | |
| 883 clrf SSP1CON1 ; wake-up slave and reset entire module | |
| 884 clrf SSP1CON2 | |
| 885 clrf SSP1STAT | |
| 886 bcf TRISC,3 ; SCL OUTPUT | |
| 887 bsf TRISC,4 ; SDA input | |
| 888 bcf PORTC,3 | |
| 889 movlw d'9' | |
| 890 movwf i2c_temp1 ; clock-out 9 clock cycles manually | |
| 891 I2CReset_1: | |
| 892 bsf PORTC,3 ; SCL = 1 | |
| 893 nop | |
| 894 nop | |
| 895 nop | |
| 896 nop | |
| 897 btfsc PORTC,4 ; SDA = 1 ? | |
| 898 bra I2CReset_2 ; YES - =1, SDA has been released from slave | |
| 899 bcf PORTC,3 ; NO - set SCL = 0 | |
| 900 nop | |
| 901 nop | |
| 902 bcf PORTC,3 | |
| 903 nop | |
| 904 nop | |
| 905 decfsz i2c_temp1,F | |
| 906 bra I2CReset_1 ; check for nine clock cycles | |
| 907 I2CReset_2: | |
| 908 bsf TRISC,3 ; SCL Input | |
| 909 clrf SSP1CON1 ; setup I²C mode | |
| 910 WAITMS d'10' ; reset-timeout for I2C devices | |
| 911 movlw b'00000000' ; with slew rate control | |
| 912 movwf SSP1STAT | |
| 913 movlw b'00101000' | |
| 914 movwf SSP1CON1 | |
| 915 movlw b'00000000' | |
| 916 movwf SSP1CON2 | |
| 628 | 917 movlw 0x9C |
| 615 | 918 movwf SSP1ADD |
| 919 return | |
| 623 | 920 |
| 921 | |
|
556
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fix a potential issue in the battery managment
heinrichsweikamp
parents:
498
diff
changeset
|
922 lt2942_init_again: |
| 582 | 923 clrf i2c_temp1 |
| 623 | 924 movlw 0x02 ; point to accumulated charge registers |
|
556
dd28d4efd4d2
fix a potential issue in the battery managment
heinrichsweikamp
parents:
498
diff
changeset
|
925 rcall I2C_TX_GAUGE |
| 623 | 926 movff battery_accumulated_charge+1,SSP1BUF ; data byte |
|
556
dd28d4efd4d2
fix a potential issue in the battery managment
heinrichsweikamp
parents:
498
diff
changeset
|
927 rcall WaitMSSP |
|
dd28d4efd4d2
fix a potential issue in the battery managment
heinrichsweikamp
parents:
498
diff
changeset
|
928 rcall I2C_WaitforACK |
| 623 | 929 movff battery_accumulated_charge+0,SSP1BUF ; data byte |
|
556
dd28d4efd4d2
fix a potential issue in the battery managment
heinrichsweikamp
parents:
498
diff
changeset
|
930 rcall WaitMSSP |
|
dd28d4efd4d2
fix a potential issue in the battery managment
heinrichsweikamp
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498
diff
changeset
|
931 rcall I2C_WaitforACK |
| 623 | 932 bsf SSP1CON2,PEN ; stop condition |
| 560 | 933 rcall WaitMSSP |
| 623 | 934 MOVII battery_accumulated_charge,sub_a |
|
556
dd28d4efd4d2
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heinrichsweikamp
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498
diff
changeset
|
935 ; and init again... |
| 560 | 936 |
| 628 | 937 |
| 582 | 938 global lt2942_init |
| 623 | 939 lt2942_init: ; setup control register B |
| 582 | 940 clrf i2c_temp1 |
| 623 | 941 movlw 0x01 ; point to control reg B |
| 467 | 942 rcall I2C_TX_GAUGE |
| 623 | 943 movlw b'11111000' ; automatic conversion every two seconds |
| 944 movff WREG, SSP1BUF ; data byte | |
| 113 | 945 rcall WaitMSSP |
| 946 rcall I2C_WaitforACK | |
| 623 | 947 bsf SSP1CON2,PEN ; stop condition |
| 948 bra WaitMSSP ; ... and return | |
| 113 | 949 |
| 628 | 950 |
| 113 | 951 global lt2942_get_status |
| 623 | 952 lt2942_get_status: ; read status register |
| 953 bcf battery_gauge_available ; clear flag | |
| 582 | 954 clrf i2c_temp1 |
| 623 | 955 movlw 0x00 ; point to status register |
| 467 | 956 rcall I2C_TX_GAUGE |
| 957 rcall I2C_RX_GAUGE | |
| 113 | 958 movff SSP1BUF,WREG |
| 582 | 959 btfss WREG,7 ; 2942 found? |
| 623 | 960 bsf battery_gauge_available ; YES - set flag |
| 961 bsf SSP1CON2,PEN ; stop condition | |
| 962 bra WaitMSSP ; ... and return | |
| 113 | 963 |
| 964 | |
| 965 global lt2942_get_voltage | |
| 623 | 966 lt2942_get_voltage: ; read battery voltage registers |
| 582 | 967 clrf i2c_temp1 |
| 623 | 968 movlw 0x08 ; point to voltage registers |
| 448 | 969 rcall I2C_TX_GAUGE |
| 970 rcall I2C_RX_GAUGE | |
| 623 | 971 bsf SSP1CON2,ACKEN ; master acknowledge |
| 615 | 972 rcall WaitMSSP |
| 973 movff SSP1BUF,xA+1 | |
| 623 | 974 bsf SSP1CON2, RCEN ; enable receive mode |
| 615 | 975 rcall WaitMSSP |
| 976 movff SSP1BUF,xA+0 | |
| 623 | 977 bsf SSP1CON2,PEN ; stop condition |
| 615 | 978 rcall WaitMSSP |
| 979 | |
| 623 | 980 ; convert voltage from raw value to Volt |
| 981 MOVLI .6000,xB ; load conversion multiplicand into xB | |
| 982 call mult16x16 ; xC = xA * xB -> multiply raw value in xA with conversion multiplicand | |
| 983 ; divide by 65536 instead of 65535, introducing an error of 65536/65535 = 0.002 % | |
| 984 movff xC+2,batt_voltage+0 ; divide by 65536 can easily be done by just taking the 3rd and 4th byte of the multiplication result | |
| 985 movff xC+3,batt_voltage+1 ; ... | |
| 615 | 986 |
| 623 | 987 tstfsz batt_voltage+1 ; < 256 mV ? |
| 988 return ; NO - done | |
| 989 bra lt2942_init ; YES - ... and return | |
| 990 | |
| 615 | 991 |
| 623 | 992 global lt2942_get_temperature |
| 993 lt2942_get_temperature: ; read battery temperature | |
| 994 clrf i2c_temp1 | |
| 995 movlw 0x0C ; point to temperature register | |
| 996 call I2C_TX_GAUGE | |
| 997 call I2C_RX_GAUGE | |
| 998 bsf SSP1CON2,ACKEN ; master acknowledge | |
| 999 rcall WaitMSSP | |
| 1000 movff SSP1BUF,xA+1 ; store raw temperature, high byte | |
| 628 | 1001 bsf SSP1CON2,RCEN ; enable receive mode |
| 623 | 1002 rcall WaitMSSP |
| 1003 movff SSP1BUF,xA+0 ; store raw temperature, low byte | |
| 1004 bsf SSP1CON2,PEN ; stop condition | |
| 1005 rcall WaitMSSP | |
| 1006 | |
| 1007 ; convert temperature from raw value to Kelvin | |
| 1008 MOVLI .6000,xB ; load conversion multiplicand into xB | |
| 1009 call mult16x16 ; xC = xA * xB -> multiply raw value in xA with conversion multiplicand | |
| 1010 ; divide by 65536 instead of 65535, introducing an error of 65536/65535 = 0.002 % | |
| 1011 movff xC+2,battery_temperature+0 ; divide by 65536 can easily be done by just taking the 3rd and 4th byte of the multiplication result | |
| 1012 movff xC+3,battery_temperature+1 ; ... | |
| 1013 | |
| 1014 ; check if battery is charged right now | |
| 1015 btfss cc_active ; in CC charging mode? | |
| 1016 return ; NO - not charging, done | |
| 1017 | |
| 1018 ; check for over-temperature while charging | |
| 1019 MOVLI max_battery_charge_temp,sub_a | |
| 1020 MOVII battery_temperature, sub_b | |
| 1021 call cmpU16 ; sub_a - sub_b (with UNSIGNED values) | |
| 1022 btfss neg_flag ; result negative? | |
| 1023 return ; NO - temperature <= threshold, ok, done | |
| 1024 ; YES - too hot, disable charging circuitry | |
| 1025 bsf charge_disable ; - set charging-inhibit signal | |
| 1026 bcf charge_enable ; - activate charging-inhibit signal | |
| 1027 bsf battery_overtemp ; - flag that the battery charging over-temperature protection has tripped | |
| 1028 return | |
| 1029 | |
| 113 | 1030 |
| 1031 global lt2942_get_accumulated_charge | |
| 623 | 1032 lt2942_get_accumulated_charge: ; read accumulated charge and compute percent |
| 582 | 1033 clrf i2c_temp1 |
| 623 | 1034 movlw 0x00 ; point to status register |
| 467 | 1035 rcall I2C_TX_GAUGE |
| 1036 rcall I2C_RX_GAUGE | |
| 623 | 1037 bsf SSP1CON2,ACKEN ; master acknowledge |
| 113 | 1038 rcall WaitMSSP |
| 466 | 1039 movff SSP1BUF,gauge_status_byte |
| 1040 | |
| 623 | 1041 bsf SSP1CON2, RCEN ; enable receive mode |
| 1042 rcall WaitMSSP ; dummy read (control byte) | |
| 467 | 1043 movf SSP1BUF,W |
| 623 | 1044 bsf SSP1CON2,ACKEN ; master acknowledge |
| 467 | 1045 rcall WaitMSSP |
| 582 | 1046 |
| 623 | 1047 bsf SSP1CON2, RCEN ; enable receive mode |
| 466 | 1048 rcall WaitMSSP |
| 623 | 1049 movff SSP1BUF,sub_a+1 |
| 1050 bsf SSP1CON2,ACKEN ; master acknowledge | |
| 113 | 1051 rcall WaitMSSP |
| 582 | 1052 |
| 623 | 1053 bsf SSP1CON2, RCEN ; enable receive mode |
| 1054 rcall WaitMSSP | |
| 1055 movff SSP1BUF,sub_a+0 | |
| 1056 bsf SSP1CON2,PEN ; stop condition | |
| 1057 rcall WaitMSSP | |
| 113 | 1058 |
| 623 | 1059 btfsc gauge_status_byte,0 ; UVLO event ? |
| 1060 rcall lt2942_init_again ; YES | |
| 1061 | |
| 1062 MOVII sub_a,battery_accumulated_charge ; save raw value | |
| 582 | 1063 |
| 1064 ; Compute batt_percent | |
| 1065 ; (charge-battery_offset)/365 | |
| 623 | 1066 MOVII battery_offset,sub_b |
| 582 | 1067 call subU16 ; sub_c = sub_a - sub_b (with signed values) |
| 623 | 1068 clrf batt_percent ; set to zero |
| 582 | 1069 btfsc neg_flag ; result negative? |
| 623 | 1070 bra lt2942_set_to_zero_percent ; YES - keep LT2942 at zero percent and return |
| 113 | 1071 |
| 623 | 1072 ; > zero, set batt_percent properly |
| 1073 MOVII sub_c,xA | |
| 1074 MOVII battery_capacity,xB | |
| 604 | 1075 call div16x16 ; xC = xA / xB with xA as remainder |
| 582 | 1076 movff xC+0,batt_percent |
| 628 | 1077 movlw .100 ; max. value is 100 % |
| 1078 cpfslt batt_percent ; batt_percent < 100 % ? | |
| 1079 movwf batt_percent ; NO - limit to 100 % | |
| 631 | 1080 return ; done |
| 113 | 1081 |
| 449 | 1082 lt2942_set_to_zero_percent: |
| 582 | 1083 clrf i2c_temp1 |
| 623 | 1084 movlw 0x02 ; point to accumulated charge registers |
| 449 | 1085 rcall I2C_TX_GAUGE |
| 1086 movff battery_offset+1,SSP1BUF | |
| 1087 rcall WaitMSSP | |
| 1088 rcall I2C_WaitforACK | |
| 1089 movff battery_offset+0,SSP1BUF | |
| 1090 rcall WaitMSSP | |
| 1091 rcall I2C_WaitforACK | |
| 623 | 1092 bsf SSP1CON2,PEN ; stop condition |
| 1093 bra WaitMSSP ; ... and return | |
| 449 | 1094 |
| 628 | 1095 |
| 113 | 1096 global lt2942_charge_done |
| 623 | 1097 lt2942_charge_done: ; reset accumulating registers to 0xFFFF |
| 582 | 1098 clrf i2c_temp1 |
| 623 | 1099 movlw 0x02 ; point to accumulated charge registers |
| 448 | 1100 rcall I2C_TX_GAUGE |
| 623 | 1101 setf SSP1BUF ; data byte |
| 113 | 1102 rcall WaitMSSP |
| 1103 rcall I2C_WaitforACK | |
| 623 | 1104 setf SSP1BUF ; data byte |
| 113 | 1105 rcall WaitMSSP |
| 1106 rcall I2C_WaitforACK | |
| 623 | 1107 bsf SSP1CON2,PEN ; stop condition |
| 1108 bra WaitMSSP ; ... and return | |
| 113 | 1109 |
| 623 | 1110 I2C_TX_GAUGE: ; send a byte to the LT2942 gauge IC |
| 1111 movwf i2c_temp2 ; data byte | |
| 1112 bsf SSP1CON2,SEN ; start condition | |
| 113 | 1113 rcall WaitMSSP |
| 623 | 1114 movlw b'11001000' ; address byte + Write bit |
| 582 | 1115 movwf SSP1BUF ; control byte |
| 113 | 1116 rcall WaitMSSP |
| 1117 rcall I2C_WaitforACK | |
| 582 | 1118 movf i2c_temp2,W |
| 623 | 1119 bra I2C_TX ; ... and return |
| 582 | 1120 |
| 113 | 1121 I2C_RX_GAUGE: |
| 623 | 1122 bsf SSP1CON2,SEN ; start condition |
| 113 | 1123 rcall WaitMSSP |
| 623 | 1124 movlw b'11001001' ; address byte + Read bit |
| 582 | 1125 movwf SSP1BUF ; control byte |
| 113 | 1126 rcall WaitMSSP |
| 1127 rcall I2C_WaitforACK | |
| 628 | 1128 bsf SSP1CON2,RCEN ; enable receive mode |
| 623 | 1129 bra WaitMSSP ; ... and return |
| 582 | 1130 |
| 1131 | |
| 631 | 1132 global reset_battery_gauge_and_lt2942 ; called from comm and menu tree |
| 1133 reset_battery_gauge_and_lt2942: ; reset battery gauge chip and battery registers | |
| 1134 btfsc battery_gauge_available ; battery gauge chip available? | |
| 1135 call lt2942_charge_done ; YES - reset meter to 0xFFFF | |
| 1136 ;bra reset_battery_gauge ; continue resetting gauge registers | |
| 1137 | |
| 1138 global reset_battery_gauge | |
| 1139 reset_battery_gauge: ; reset gauge registers | |
| 1140 bsf block_battery_gauge ; suspend ISR from accessing the battery registers | |
| 1141 movlw .100 ; set battery level to 100% | |
| 1142 movwf batt_percent ; ... | |
| 1143 banksel battery_gauge ; select bank ISR data | |
| 1144 clrf battery_gauge+0 ; null the battery registers | |
| 1145 clrf battery_gauge+1 ; ... | |
| 1146 clrf battery_gauge+2 ; ... | |
| 1147 clrf battery_gauge+3 ; ... | |
| 1148 clrf battery_gauge+4 ; ... | |
| 1149 clrf battery_gauge+5 ; ... | |
| 1150 banksel common ; back to bank common | |
| 1151 goto eeprom_battery_gauge_write ; update battery registers in EEPROM, unblock ISR and return | |
| 1152 | |
| 1153 | |
| 623 | 1154 ;============================================================================= |
| 604 | 1155 ; Transmitter Functions |
| 623 | 1156 ; |
| 604 | 1157 IFDEF _rx_functions |
| 1158 | |
| 560 | 1159 global I2C_probe_OSTC_rx |
| 1160 I2C_probe_OSTC_rx: | |
| 623 | 1161 bcf ostc_rx_present ; no TR module by default |
| 1162 clrf WREG ; bank-safe set to zero of ... | |
| 1163 movff WREG,rx_firmware_cur_major ; ... current TR module firmware, major | |
| 1164 movff WREG,rx_firmware_cur_minor ; ... current TR module firmware, minor | |
| 1165 movlw .5 ; max number of tries for detecting a TR module | |
| 1166 movwf hy ; initialize counter for tries | |
| 604 | 1167 I2C_probe_OSTC_rx_1: |
| 623 | 1168 bsf SSP1CON2,SEN ; start condition |
| 560 | 1169 rcall WaitMSSP |
| 623 | 1170 movlw 0x50 ; address byte + write bit |
| 582 | 1171 movwf SSP1BUF ; control byte |
| 560 | 1172 rcall WaitMSSP |
| 623 | 1173 btfss SSP1CON2,ACKSTAT ; ACK received? |
| 1174 bsf ostc_rx_present ; YES - TR module detected | |
| 1175 bsf SSP1CON2,PEN ; stop condition | |
| 560 | 1176 rcall WaitMSSP |
| 623 | 1177 btfss ostc_rx_present ; was a TR module detected? |
| 1178 return ; NO - done | |
| 560 | 1179 WAITMS .1 |
| 623 | 1180 bsf SSP1CON2,SEN ; start condition |
| 560 | 1181 rcall WaitMSSP |
| 623 | 1182 movlw 0x50 ; address byte + write bit |
| 582 | 1183 movwf SSP1BUF ; control byte |
| 560 | 1184 rcall WaitMSSP |
| 1185 rcall I2C_WaitforACK | |
| 1186 movlw 0x1B | |
| 623 | 1187 movwf SSP1BUF ; data byte (get firmware) |
| 560 | 1188 rcall WaitMSSP |
| 1189 rcall I2C_WaitforACK | |
| 623 | 1190 bsf SSP1CON2,PEN ; stop condition |
| 560 | 1191 rcall WaitMSSP |
| 1192 WAITMS .1 | |
| 623 | 1193 bsf SSP1CON2,SEN ; start condition |
| 560 | 1194 rcall WaitMSSP |
| 623 | 1195 movlw 0x51 ; address byte + Read bit |
| 582 | 1196 movwf SSP1BUF ; control byte |
| 560 | 1197 rcall WaitMSSP |
| 623 | 1198 bsf SSP1CON2,RCEN ; enable receive mode |
| 560 | 1199 rcall WaitMSSP |
| 623 | 1200 movff SSP1BUF,rx_firmware_cur_major ; store as firmware version, major |
| 1201 bsf SSP1CON2,ACKEN ; master acknowledge | |
| 560 | 1202 rcall WaitMSSP |
| 582 | 1203 |
| 560 | 1204 ; last byte in read from RX circuity always with a NACK! |
| 623 | 1205 bsf SSP1CON2,RCEN ; enable receive mode |
| 560 | 1206 rcall WaitMSSP |
| 623 | 1207 movff SSP1BUF,rx_firmware_cur_minor ; store as firmware version, minor |
| 582 | 1208 bsf SSP1CON2,ACKDT |
| 623 | 1209 bsf SSP1CON2,ACKEN ; master NOT acknowledge |
| 560 | 1210 rcall WaitMSSP |
| 623 | 1211 bcf SSP1CON2,ACKDT ; reset ACKDT flag |
| 1212 bsf SSP1CON2,PEN ; stop condition | |
| 604 | 1213 rcall WaitMSSP |
| 1214 | |
| 623 | 1215 ; wait for TR module becoming ready |
| 1216 movff rx_firmware_cur_minor,i2c_temp1 ; copy firmware version to bank common, minor | |
| 1217 movlw .147 ; code for not ready, minor | |
| 1218 cpfseq i2c_temp1 ; equal? | |
| 1219 bra I2C_probe_OSTC_rx_2 ; NO - TR module ready | |
| 1220 movff rx_firmware_cur_major,i2c_temp1 ; YES - copy firmware version to bank common, major | |
| 1221 movlw .27 ; - code for not ready, major | |
| 1222 cpfseq i2c_temp1 ; - equal? | |
| 1223 bra I2C_probe_OSTC_rx_2 ; NO - TR module ready | |
| 1224 bsf active_reset_ostc_rx ; YES - apply reset to TR module | |
| 1225 WAITMS .5 ; - wait 5 ms | |
| 1226 bcf active_reset_ostc_rx ; - release reset | |
| 1227 WAITMS .250 ; - wait for 250 ms | |
| 1228 WAITMS .250 ; - wait another 250 ms | |
| 1229 clrf i2c_temp1 ; - clean-up i2c_temp1 | |
| 1230 decfsz hy,F ; - decrement counter for number of tries, became zero? | |
| 1231 bra I2C_probe_OSTC_rx_1 ; - NO - try again | |
| 1232 bcf ostc_rx_present ; - YES - something is wrong, flag TR module as not available | |
| 604 | 1233 I2C_probe_OSTC_rx_2: |
| 623 | 1234 clrf i2c_temp1 ; clean-up i2c_temp1 |
| 1235 return ; done | |
| 582 | 1236 |
| 560 | 1237 |
| 1238 global I2C_get_tankdata | |
| 1239 I2C_get_tankdata: | |
| 623 | 1240 bsf SSP1CON2,SEN ; start condition |
| 560 | 1241 rcall WaitMSSP |
| 623 | 1242 movlw 0x50 ; address byte + write bit |
| 582 | 1243 movwf SSP1BUF ; control byte |
| 560 | 1244 rcall WaitMSSP |
| 1245 rcall I2C_WaitforACK | |
| 623 | 1246 movlw 0x1E ; read buffer2 (48 bytes) |
| 1247 movwf SSP1BUF ; data byte | |
| 560 | 1248 rcall WaitMSSP |
| 1249 rcall I2C_WaitforACK | |
| 623 | 1250 bsf SSP1CON2,PEN ; stop condition |
| 560 | 1251 rcall WaitMSSP |
| 1252 WAITMS .1 | |
| 1253 ; read 48 bytes | |
| 623 | 1254 bsf SSP1CON2,SEN ; start condition |
| 560 | 1255 rcall WaitMSSP |
| 623 | 1256 movlw 0x51 ; address byte + read bit |
| 582 | 1257 movwf SSP1BUF ; control byte |
| 560 | 1258 rcall WaitMSSP |
| 1259 rcall I2C_WaitforACK | |
| 582 | 1260 movlw .47 ; 47 with ACK + 1 w/o ACK |
| 1261 movwf i2c_temp2 | |
| 623 | 1262 lfsr FSR2,rx_buffer |
| 560 | 1263 I2C_get_tankdata_loop_read: |
| 623 | 1264 bsf SSP1CON2, RCEN ; enable receive mode |
| 560 | 1265 rcall WaitMSSP |
| 1266 movff SSP1BUF,POSTINC2 | |
| 582 | 1267 bcf SSP1CON2,ACKDT |
| 623 | 1268 bsf SSP1CON2,ACKEN ; master acknowledge |
| 560 | 1269 rcall WaitMSSP |
| 582 | 1270 decfsz i2c_temp2,F |
| 1271 bra I2C_get_tankdata_loop_read | |
| 560 | 1272 ; 1 w/o ACK |
| 623 | 1273 bsf SSP1CON2, RCEN ; enable receive mode |
| 560 | 1274 rcall WaitMSSP |
| 1275 movff SSP1BUF,POSTINC2 | |
| 582 | 1276 bsf SSP1CON2,ACKDT |
| 623 | 1277 bsf SSP1CON2,ACKEN ; master NOT acknowledge |
| 560 | 1278 rcall WaitMSSP |
| 623 | 1279 bcf SSP1CON2,ACKDT ; reset ACKDT flag |
| 1280 bsf SSP1CON2,PEN ; stop condition | |
| 1281 bra WaitMSSP ; ... and return | |
| 582 | 1282 |
| 1283 | |
| 628 | 1284 IFDEF _rx_update |
| 1285 | |
| 560 | 1286 global I2C_update_OSTC_rx |
| 623 | 1287 I2C_update_OSTC_rx: ; transfer 64 byte to RX co-processor |
| 1288 ; setup for write | |
| 582 | 1289 bcf i2c_error_flag ; clear error flag |
| 623 | 1290 lfsr FSR2,buffer ; initialize pointer to send buffer used for verify |
| 1291 movlw .64 ; initialize loop counter: 64 byte with ACK | |
| 1292 movwf i2c_temp2 ; ... | |
| 1293 ; address write | |
| 1294 bsf SSP1CON2,SEN ; start condition | |
| 560 | 1295 rcall WaitMSSP |
| 623 | 1296 movlw 0x50 ; address byte + write bit |
| 582 | 1297 movwf SSP1BUF ; control byte |
| 560 | 1298 rcall WaitMSSP |
| 1299 rcall I2C_WaitforACK | |
| 623 | 1300 ; write 64 bytes |
| 1301 I2C_update_OSTC_loop: | |
| 1302 TBLRD*+ ; read a byte from program memory | |
| 1303 movff TABLAT,POSTINC2 ; copy to send buffer | |
| 1304 movff TABLAT,SSP1BUF ; copy to I2C data buffer | |
| 560 | 1305 rcall WaitMSSP |
| 1306 rcall I2C_WaitforACK | |
| 623 | 1307 decfsz i2c_temp2,F ;decrement loop counter, became zero? |
| 1308 bra I2C_update_OSTC_loop ; NO - loop | |
| 1309 bsf SSP1CON2,PEN ; YES - stop condition | |
| 1310 rcall WaitMSSP ; - wait for stop condition done | |
| 1311 WAITMS .1 ; - wait another 1 ms | |
| 1312 ; setup for read-back | |
| 1313 lfsr FSR2,buffer ; reset pointer to begin of send buffer | |
| 1314 movlw .63 ; initialize loop counter: 63 byte with ACK + 1 w/o ACK | |
| 1315 movwf i2c_temp2 | |
| 1316 ; address read-back | |
| 1317 bsf SSP1CON2,SEN ; start condition | |
| 560 | 1318 rcall WaitMSSP |
| 623 | 1319 movlw 0x51 ; address byte + read bit |
| 582 | 1320 movwf SSP1BUF ; control byte |
| 560 | 1321 rcall WaitMSSP |
| 1322 rcall I2C_WaitforACK | |
| 623 | 1323 ; read-back 64 bytes |
| 560 | 1324 I2C_update_OSTC_loop_read: |
| 623 | 1325 bsf SSP1CON2,RCEN ; enable receive mode |
| 560 | 1326 rcall WaitMSSP |
| 1327 movf SSP1BUF,W | |
| 623 | 1328 cpfseq POSTINC2 ; compare read-back byte with sent byte, equal? |
| 1329 bsf i2c_error_flag ; NO - not equal, set error flag | |
| 582 | 1330 bcf SSP1CON2,ACKDT |
| 623 | 1331 bsf SSP1CON2,ACKEN ; master acknowledge |
| 560 | 1332 rcall WaitMSSP |
| 623 | 1333 decfsz i2c_temp2,F ; decrement loop counter, became zero? |
| 1334 bra I2C_update_OSTC_loop_read ; NO - loop | |
| 560 | 1335 ; 1 w/o ACK |
| 623 | 1336 bsf SSP1CON2, RCEN ; YES - enable receive mode |
| 1337 rcall WaitMSSP ; - | |
| 1338 movf SSP1BUF,W ; - get 64th byte | |
| 1339 cpfseq POSTINC2 ; - compare read-back byte with sent byte, equal? | |
| 1340 bsf i2c_error_flag ; NO - not equal, set error flag | |
| 1341 bsf SSP1CON2,ACKDT ; - | |
| 1342 bsf SSP1CON2,ACKEN ; - master NOT acknowledge | |
| 1343 rcall WaitMSSP ; - | |
| 1344 bcf SSP1CON2,ACKDT ; - reset ACKDT flag | |
| 1345 ; stop | |
| 1346 bsf SSP1CON2,PEN ; stop condition | |
| 560 | 1347 rcall WaitMSSP |
| 1348 WAITMS .1 | |
| 623 | 1349 ; address commit |
| 1350 bsf SSP1CON2,SEN ; start condition | |
| 560 | 1351 rcall WaitMSSP |
| 623 | 1352 movlw 0x50 ; address byte + write bit |
| 582 | 1353 movwf SSP1BUF ; control byte |
| 560 | 1354 rcall WaitMSSP |
| 1355 rcall I2C_WaitforACK | |
| 623 | 1356 movlw 0x1F ; write command |
| 1357 movwf SSP1BUF ; data byte | |
| 560 | 1358 rcall WaitMSSP |
| 1359 rcall I2C_WaitforACK | |
| 623 | 1360 bsf SSP1CON2,PEN ; stop condition |
| 560 | 1361 rcall WaitMSSP |
| 623 | 1362 WAITMS .5 ; required waiting time |
| 1363 ; error check | |
| 1364 btfss i2c_error_flag ; did an error occur? | |
| 1365 retlw .0 ; NO - data transfered successfully | |
| 1366 retlw .255 ; YES - error in data transfer occurred | |
| 582 | 1367 |
| 628 | 1368 ENDIF ; _rx_update |
| 1369 | |
| 1370 ENDIF ; _rx_functions | |
| 604 | 1371 |
| 623 | 1372 ;============================================================================= |
| 1373 | |
| 582 | 1374 END |