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comparison code_part1/OSTC_code_asm_part1/isr.asm @ 341:2144f19fa1eb

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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
comparison
equal deleted inserted replaced
340:ecbbbd423e86 341:2144f19fa1eb
26 ; temperature and pressure is averaged over 4 measurements 26 ; temperature and pressure is averaged over 4 measurements
27 ; flag pressure_refresh is set every 500ms 27 ; flag pressure_refresh is set every 500ms
28 ; and provides accurate pressure (+/-1mBar stable) and temperature (0.1C stable) 28 ; and provides accurate pressure (+/-1mBar stable) and temperature (0.1C stable)
29 29
30 ;============================================================================= 30 ;=============================================================================
31 31 ; Copy a 16bit value from ISR modified registers to main registers.
32 ;
33 ; Because the ISR can happend at any time, the read should be redone if bytes
34 ; changed inbetween.
35 ;
36 ; NOTE: Destination might be in any bank, so be BANK SAFE on b
37
38 SAFE_2BYTE_COPY MACRO a, b
39 local retry
40 retry:
41 movf a+1,W ; High byte in W, (CURRENT BANK ONLY)
42 movff WREG,b+1 ; and destination.
43 movff a,b ; Copy low byte.
44 xorwf a+1,W ; High byte changed ??? (CURRENT BANK ONLY)
45 bnz retry
46 ENDM
47
48 ;=============================================================================
32 uartint: 49 uartint:
33 btfsc simulatormode_active ; are we in simulatormode? 50 btfsc simulatormode_active ; are we in simulatormode?
34 bra simulator_int ; Yes, reading is depth in m! 51 bra simulator_int ; Yes, reading is depth in m!
35 52
36 movff RCREG,uart1_temp 53 movff RCREG,uart1_temp
177 ; 194 ;
178 ; NOTE: averaging (4 successive value, as recommended in the MS5535 datasheet) 195 ; NOTE: averaging (4 successive value, as recommended in the MS5535 datasheet)
179 ; is done on private variables, to avoid trashing data while reading it 196 ; is done on private variables, to avoid trashing data while reading it
180 ; from the main code. 197 ; from the main code.
181 ; 198 ;
199 ; NOTE: Because there is no atomic 16bits load/stores, we need to check twice
200 ; the read data is correct. Ie. SAFE_2BYTE_COPY is mandatory to get
201 ; amb_pressure, temperaturen or rel_pressure
202 ;
182 sensor_int: 203 sensor_int:
183 btfsc no_sensor_int ; No sensor interrupt (because it's addressed during sleep) 204 btfsc no_sensor_int ; No sensor interrupt (because it's addressed during sleep)
184 return 205 return
185 206
186 incf timer1int_counter2,F ; counts to eight for state maschine 207 incf timer1int_counter2,F ; counts to eight for state maschine