Mercurial > public > mk2
annotate code_part1/OSTC_code_asm_part1/isr.asm @ 341:2144f19fa1eb
BUGFIX protect against ISR changing pressure/temperature while reading it.
| author | JeanDo |
|---|---|
| date | Fri, 20 May 2011 00:48:30 +0200 |
| parents | ecbbbd423e86 |
| children | d5240792be51 |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 ; OSTC - diving computer code | |
| 3 ; Copyright (C) 2008 HeinrichsWeikamp GbR | |
| 4 | |
| 5 ; This program is free software: you can redistribute it and/or modify | |
| 6 ; it under the terms of the GNU General Public License as published by | |
| 7 ; the Free Software Foundation, either version 3 of the License, or | |
| 8 ; (at your option) any later version. | |
| 9 | |
| 10 ; This program is distributed in the hope that it will be useful, | |
| 11 ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 ; GNU General Public License for more details. | |
| 14 | |
| 15 ; You should have received a copy of the GNU General Public License | |
| 16 ; along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 | |
| 18 | |
| 19 ; written by: Matthias Heinrichs, info@heinrichsweikamp.com | |
| 20 ; written: 10/30/05 | |
| 21 ; last updated: 05/16/08 | |
| 22 ; known bugs: | |
| 23 ; ToDo: | |
| 24 | |
| 25 ; the timer1 module interrupts every 62.5ms (16x/second) | |
| 26 ; temperature and pressure is averaged over 4 measurements | |
| 27 ; flag pressure_refresh is set every 500ms | |
| 28 ; and provides accurate pressure (+/-1mBar stable) and temperature (0.1C stable) | |
| 29 | |
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30 ;============================================================================= |
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31 ; Copy a 16bit value from ISR modified registers to main registers. |
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32 ; |
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33 ; Because the ISR can happend at any time, the read should be redone if bytes |
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34 ; changed inbetween. |
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35 ; |
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36 ; NOTE: Destination might be in any bank, so be BANK SAFE on b |
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37 |
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38 SAFE_2BYTE_COPY MACRO a, b |
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39 local retry |
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40 retry: |
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41 movf a+1,W ; High byte in W, (CURRENT BANK ONLY) |
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42 movff WREG,b+1 ; and destination. |
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43 movff a,b ; Copy low byte. |
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44 xorwf a+1,W ; High byte changed ??? (CURRENT BANK ONLY) |
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45 bnz retry |
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46 ENDM |
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47 |
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48 ;============================================================================= |
| 0 | 49 uartint: |
| 50 btfsc simulatormode_active ; are we in simulatormode? | |
| 51 bra simulator_int ; Yes, reading is depth in m! | |
| 52 | |
| 53 movff RCREG,uart1_temp | |
| 54 movlw d'96' | |
| 55 subwf uart1_temp,F | |
| 56 dcfsnz uart1_temp,F ; "a" | |
| 57 bsf dump_external_eeprom ; set flag | |
| 58 dcfsnz uart1_temp,F ; "b" | |
| 59 bsf uart_settime ; set flag | |
| 60 dcfsnz uart1_temp,F ; "c" | |
| 61 bsf simulatormode_active ; set flag | |
| 62 dcfsnz uart1_temp,F ; "d" | |
| 63 bsf internal_eeprom_write ; set flag | |
| 64 dcfsnz uart1_temp,F ; "e" | |
| 65 bsf uart_send_hash ; set flag | |
| 66 dcfsnz uart1_temp,F ; "f" | |
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67 bsf uart_reset_battery_stats ; set flag |
| 0 | 68 dcfsnz uart1_temp,F ; "g" |
| 69 bsf uart_send_int_eeprom ; set flag | |
| 70 dcfsnz uart1_temp,F ; "h" | |
| 71 bsf uart_reset_decodata ; set flag | |
| 72 dcfsnz uart1_temp,F ; "i" | |
| 73 bsf internal_eeprom_write2 ; set flag | |
| 74 dcfsnz uart1_temp,F ; "j" | |
| 75 bsf uart_send_int_eeprom2 ; set flag | |
| 76 dcfsnz uart1_temp,F ; "k" | |
| 77 bsf uart_store_tissue_data ; set flag | |
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78 |
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79 movlw 0xC1 |
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80 cpfseq RCREG ; 115200Baud Bootloader request? |
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81 bra uartint1 ; No |
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82 bsf uart_115200_bootloader ; Yes, set Flag |
| 0 | 83 |
| 84 uartint1: | |
| 85 movf RCREG,w ; unload RCREG in stand-alone simulator mode | |
| 86 bcf PIR1,RCIF ; Clear flag | |
| 87 bcf RCSTA,CREN ; Clear receiver status | |
| 88 bsf RCSTA,CREN | |
| 89 return | |
| 90 | |
| 91 simulator_int: | |
| 92 btfsc standalone_simulator ; ignore in standalone simulator mode | |
| 93 bra uartint1 | |
| 94 | |
| 21 | 95 bsf LED_blue |
| 0 | 96 tstfsz RCREG ; =0x00? |
| 97 bra simulator_int1 ; No | |
| 98 incf RCREG,F ; Yes, so force RCREG=1 | |
| 99 | |
| 100 simulator_int1: | |
| 101 movf RCREG,w ; depth in m | |
| 102 mullw d'100' ; result will be mbar | |
| 103 movff PRODL,sim_pressure+0 ; stored for pressure overwrite | |
| 104 movff PRODH,sim_pressure+1 | |
| 105 bra uartint1 ; exit uart int | |
| 106 | |
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107 ;============================================================================= |
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108 |
| 238 | 109 switch_left_int: |
| 0 | 110 bcf INTCON,INT0IF ; Clear flag |
| 111 | |
| 112 btfsc T0CON,TMR0ON ; Timer0 running? | |
| 113 bra timer0_restart ; Yes, restart | |
| 114 | |
| 266 | 115 ; OSTC 2N has flipped screen and exchanged switches... |
| 116 movff win_flags,WREG ; Get into Bank0 | |
| 117 btfss WREG,0 | |
| 0 | 118 bsf switch_left ; Set flag, button press is OK |
| 266 | 119 btfsc WREG,0 |
| 120 bsf switch_right ; Set flag, button press is OK | |
| 0 | 121 |
| 122 bsf T0CON,TMR0ON ; Start Timer 0 | |
| 123 return | |
| 124 | |
| 125 | |
| 238 | 126 switch_right_int: |
| 0 | 127 bcf INTCON3,INT1IF ; Clear flag |
| 128 | |
| 129 btfsc T0CON,TMR0ON ; Timer0 running? | |
| 130 bra timer0_restart ; Yes, restart | |
| 131 | |
| 266 | 132 ; OSTC 2N has flipped screen and exchanged switches... |
| 133 movff win_flags,WREG ; Get into Bank0 | |
| 134 btfsc WREG,0 | |
| 135 bsf switch_left ; Set flag, button press is OK | |
| 136 btfss WREG,0 | |
| 0 | 137 bsf switch_right ; Set flag, button press is OK |
| 138 | |
| 139 bsf T0CON,TMR0ON ; Start Timer 0 | |
| 140 return | |
| 141 | |
| 142 timer0_restart: | |
| 143 bcf INTCON,TMR0IF ; Clear flag | |
| 144 clrf T0CON ; Timer0 | |
| 145 clrf TMR0H | |
| 146 clrf TMR0L | |
| 147 bsf T0CON,TMR0ON ; Start Timer 0 | |
| 148 return | |
| 149 | |
| 150 timer0int: | |
| 151 bcf INTCON,TMR0IF ; Clear flag | |
| 152 bcf T0CON,TMR0ON ; Stop Timer 0 | |
| 153 clrf TMR0H | |
| 154 clrf TMR0L | |
| 155 return | |
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156 |
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157 ;============================================================================= |
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158 ; |
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159 |
| 0 | 160 timer1int: |
| 161 bcf PIR1,TMR1IF ; Clear flag | |
| 162 | |
| 163 timer1int_debug: | |
| 21 | 164 bcf LED_red ; LEDr off (For charge indicator) |
| 0 | 165 |
| 166 movlw 0x08 ; Timer1 int after 62.5ms (=16/second) | |
| 167 cpfslt TMR1H ; Did we miss a 1/16 second? | |
| 168 incf timer1int_counter1,F ; Yes, add extra 1/16 second | |
| 169 | |
| 170 movlw 0x08 ; Timer1 int after 62.5ms (=16/second) | |
| 171 subwf TMR1H,F | |
| 172 | |
| 238 | 173 incf timer1int_counter1,F ; Increase timer1 counter |
| 174 | |
| 0 | 175 movlw d'15' ; One second 16 |
| 176 cpfsgt timer1int_counter1 | |
| 177 bra sensor_int_pre ; only pressure sensor | |
| 238 | 178 rcall RTCisr ; adjust time, then query pressure sensor |
| 0 | 179 |
| 180 sensor_int_pre: | |
| 238 | 181 btfsc sleepmode ; In sleepmode? |
| 182 return ; Yes | |
| 0 | 183 |
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184 ; Sensor interput do poll the presure/temperature sensor, download results, |
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185 ; compute compensations, and store results in various shared variables. |
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186 ; |
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187 ; Input: interupt (every 62.5msec == 16Hz), sensor, |
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188 ; last_surfpressure:2. |
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189 ; |
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190 ; Output: amb_pressure:2, |
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191 ; temperature:2, |
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192 ; rel_pressure:2, |
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193 ; and the pressure_refresh flag. |
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194 ; |
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195 ; NOTE: averaging (4 successive value, as recommended in the MS5535 datasheet) |
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196 ; is done on private variables, to avoid trashing data while reading it |
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197 ; from the main code. |
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198 ; |
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199 ; NOTE: Because there is no atomic 16bits load/stores, we need to check twice |
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200 ; the read data is correct. Ie. SAFE_2BYTE_COPY is mandatory to get |
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201 ; amb_pressure, temperaturen or rel_pressure |
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202 ; |
| 0 | 203 sensor_int: |
| 204 btfsc no_sensor_int ; No sensor interrupt (because it's addressed during sleep) | |
| 205 return | |
| 206 | |
| 238 | 207 incf timer1int_counter2,F ; counts to eight for state maschine |
| 0 | 208 |
| 238 | 209 ; State 1: Clear flags and average registers, get temperature (51us) and start pressure integration (73,5us) |
| 210 ; State 2: Get pressure (51us), start temperature integration (73,5us) and calculate temperature compensated pressure (233us) | |
| 211 ; State 3: Get temperature (51us) and start pressure integration (73,5us) | |
| 212 ; State 4: Get pressure (51us), start temperature integration (73,5us) and calculate temperature compensated pressure (233us) | |
| 213 ; State 5: Get temperature (51us) and start pressure integration (73,5us) | |
| 214 ; State 6: Get pressure (51us), start temperature integration (73,5us) and calculate temperature compensated pressure (233us) | |
| 215 ; State 7: Get temperature (51us) and start pressure integration (73,5us) | |
| 216 ; State 8: Get pressure (51us), start temperature integration (73,5us), calculate temperature compensated pressure (233us) and build average for half-second update of tempperature and pressure | |
| 217 | |
| 218 movff timer1int_counter2,isr_divB ; isr_divB used as temp here... | |
| 219 dcfsnz isr_divB,F | |
| 220 bra sensor_int_state1_plus_restart ; Do State 1 | |
| 221 dcfsnz isr_divB,F | |
| 222 bra sensor_int_state2 ; Do State 2 | |
| 223 dcfsnz isr_divB,F | |
| 224 bra sensor_int_state1 ; Do State 3 | |
| 225 dcfsnz isr_divB,F | |
| 226 bra sensor_int_state2 ; Do State 4 | |
| 227 dcfsnz isr_divB,F | |
| 228 bra sensor_int_state1 ; Do State 5 | |
| 229 dcfsnz isr_divB,F | |
| 230 bra sensor_int_state2 ; Do State 6 | |
| 231 dcfsnz isr_divB,F | |
| 232 bra sensor_int_state1 ; Do State 7 | |
| 233 ; bra sensor_int2_plus_average ; Do State 8 | |
| 234 | |
| 235 ;sensor_int2_plus_average: | |
| 236 rcall sensor_int_state2 | |
| 237 sensor_int2_plus_average2: | |
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238 bcf STATUS,C ; clear carry bit. |
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239 rrcf amb_pressure_avg+1 ; amb_pressure sum / 2 |
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240 rrcf amb_pressure_avg+0 |
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241 bcf STATUS,C ; clear carry bit, twice. |
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242 rrcf amb_pressure_avg+1 ; amb_pressure sum / 4 |
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243 rrcf amb_pressure_avg+0 |
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244 |
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245 movff amb_pressure_avg+1,amb_pressure+1 ; copy into actual register |
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246 movff amb_pressure_avg+0,amb_pressure+0 |
| 238 | 247 |
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248 bcf STATUS,C |
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249 btfsc temperature_avg+1,7 ; Copy sign bit to carry |
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250 bsf STATUS,C |
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251 rrcf temperature_avg+1 ; Signed temperature /2 |
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252 rrcf temperature_avg+0 |
| 0 | 253 |
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254 bcf STATUS,C |
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255 btfsc temperature_avg+1,7 ; Copy sign bit to carry |
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256 bsf STATUS,C |
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257 rrcf temperature_avg+1 ; Signed temperature /4 |
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258 rrcf temperature_avg+0 |
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259 |
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260 movff temperature_avg+1,temperature+1 |
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261 movff temperature_avg+0,temperature+0 |
| 0 | 262 |
| 263 bsf pressure_refresh ; Set flag! Temp and pressure were updated! | |
| 238 | 264 clrf timer1int_counter2 ; Then reset State counter |
| 0 | 265 |
| 266 btfss simulatormode_active ; are we in simulator mode? | |
| 267 bra comp_air_pressure ; no | |
| 268 | |
| 269 comp_air_pressure0: | |
| 270 movlw LOW d'1000' ; yes, so simulate 1Bar surface pressure | |
| 271 movwf last_surfpressure+0 | |
| 272 movlw HIGH d'1000' | |
| 273 movwf last_surfpressure+1 | |
| 274 | |
| 275 comp_air_pressure: | |
| 276 movf last_surfpressure+0,W ; compensate airpressure | |
| 277 subwf amb_pressure+0,W | |
| 238 | 278 movwf rel_pressure+0 ; rel_pressure stores depth! |
| 0 | 279 |
| 280 movf last_surfpressure+1,W | |
| 281 subwfb amb_pressure+1,W | |
| 282 movwf rel_pressure+1 | |
| 238 | 283 btfss STATUS,N ; result is below zero? |
| 284 return | |
| 285 clrf rel_pressure+0 ; Yes, do not display negative depths | |
| 286 clrf rel_pressure+1 ; e.g. when surface air pressure dropped during the dive | |
| 0 | 287 return |
| 238 | 288 |
| 289 sensor_int_state1_plus_restart: | |
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290 ;;; bcf pressure_refresh ; clear flags |
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291 clrf amb_pressure_avg+0 ; pressure average registers |
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292 clrf amb_pressure_avg+1 |
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293 clrf temperature_avg+0 |
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294 clrf temperature_avg+1 |
| 238 | 295 |
| 296 sensor_int_state1: | |
| 297 call get_temperature_value ; State 1: Get temperature | |
| 298 call get_pressure_start ; and start pressure integration. | |
| 299 return ; Done. | |
| 300 | |
| 301 sensor_int_state2: | |
| 302 call get_pressure_value ; State2: Get pressure (51us) | |
| 303 call get_temperature_start ; and start temperature integration (73,5us) | |
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304 goto calculate_compensation ; calculate temperature compensated pressure (233us) |
| 238 | 305 |
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306 ;============================================================================= |
| 0 | 307 |
| 308 RTCisr: | |
| 309 clrf timer1int_counter1 ; counts to 16 (one second / 62.5ms) | |
| 310 bsf onesecupdate ; we have a new second! | |
| 311 | |
| 312 bcf STATUS,Z ; are we in dive mode? | |
| 313 btfss divemode | |
| 238 | 314 bra RTCisr2 ; No, must be surface or sleepmode |
| 0 | 315 |
| 316 incf samplesecs,F ; CF20 diving seconds done | |
| 317 decf samplesecs_value,W ; holds CF20 value (minus 1 into WREG) | |
| 318 cpfsgt samplesecs | |
| 238 | 319 bra RTCisr1 ; no |
| 0 | 320 |
| 321 clrf samplesecs ; clear counter... | |
| 322 bsf store_sample ; ...and set bit for profile storage | |
| 238 | 323 |
| 0 | 324 RTCisr1: |
| 325 ; Increase re-setable average depth divetime counter | |
| 111 | 326 incf average_divesecs+0,F ; increase stopwatch registers |
| 0 | 327 btfsc STATUS,Z |
| 111 | 328 incf average_divesecs+1,F ; increase stopwatch registers |
| 0 | 329 |
| 330 btfss divemode2 ; displayed divetime is running? | |
| 331 bra RTCisr2 ; No (e.g. too shallow) | |
| 332 | |
| 333 incf divesecs,F ; increase divetime registers | |
| 334 movlw d'59' | |
| 335 cpfsgt divesecs | |
| 336 bra RTCisr1a | |
| 238 | 337 |
| 0 | 338 clrf divesecs |
| 339 bsf realdive ; this bit is always set (again) if the dive is longer then one minute | |
| 340 | |
| 341 incf divemins+0,F ; increase divemins | |
| 342 btfsc STATUS,Z | |
| 343 incf divemins+1,F ; and now do the realtime clock routine anyway | |
| 344 | |
| 345 RTCisr1a: | |
| 346 btfss FLAG_apnoe_mode ; Are we in Apnoe mode? | |
| 347 bra RTCisr2 ; No, skip the following | |
| 348 | |
| 349 incf apnoe_secs,F ; increase descent registers | |
| 350 movlw d'59' | |
| 351 cpfsgt apnoe_secs | |
| 352 bra RTCisr2 | |
| 353 clrf apnoe_secs | |
| 354 | |
| 355 incf apnoe_mins,F ; increase descent mins | |
| 356 ; Now, do the RTC routine.... | |
| 357 RTCisr2: | |
| 358 incf secs,F ; adjusts seconds, minutes, hours, day, month and year. Checks for a leap year and works until 2099! | |
| 359 movlw d'59' | |
| 360 cpfsgt secs | |
| 361 return | |
| 362 clrf secs | |
| 363 bsf oneminupdate | |
| 364 incf mins,F | |
| 365 movlw d'59' | |
| 366 cpfsgt mins | |
| 367 return | |
| 368 clrf mins | |
| 369 incf hours,F | |
| 370 movlw d'23' | |
| 371 cpfsgt hours | |
| 372 return | |
| 373 clrf hours | |
| 13 | 374 incf day,F |
| 43 | 375 movff time_correction_value,secs ; Correct too slow clock |
| 13 | 376 |
| 0 | 377 check_date: |
| 378 movff month,isr_divB ; new month? | |
| 379 dcfsnz isr_divB,F | |
| 380 movlw .31 | |
| 381 dcfsnz isr_divB,F | |
| 382 movlw .28 | |
| 383 dcfsnz isr_divB,F | |
| 384 movlw .31 | |
| 385 dcfsnz isr_divB,F | |
| 386 movlw .30 | |
| 387 dcfsnz isr_divB,F | |
| 388 movlw .31 | |
| 389 dcfsnz isr_divB,F | |
| 390 movlw .30 | |
| 391 dcfsnz isr_divB,F | |
| 392 movlw .31 | |
| 393 dcfsnz isr_divB,F | |
| 394 movlw .31 | |
| 395 dcfsnz isr_divB,F | |
| 396 movlw .30 | |
| 397 dcfsnz isr_divB,F | |
| 398 movlw .31 | |
| 399 dcfsnz isr_divB,F | |
| 400 movlw .30 | |
| 401 dcfsnz isr_divB,F | |
| 402 movlw .31 | |
| 403 cpfsgt day,1 | |
| 404 return | |
| 405 movlw .1 | |
| 406 movwf day | |
| 407 incf month,F | |
| 408 movlw .12 | |
| 409 cpfsgt month,1 | |
| 410 return | |
| 411 movlw .1 | |
| 412 movwf month | |
| 413 incf year,F | |
| 414 return |