59 lines
1.8 KiB
Arduino
59 lines
1.8 KiB
Arduino
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void initialiseTimers() {
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//Configure Timer2 for our low-freq interrupt code.
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TCCR2B = 0x00; //Disbale Timer2 while we set it up
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TCNT2 = 99; //Preload timer2 with 100 cycles, leaving 156 till overflow.
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TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
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TIMSK2 = 0x01; //Timer2 Set Overflow Interrupt enabled.
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TCCR2A = 0x00; //Timer2 Control Reg A: Wave Gen Mode normal
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TCCR2B = ((1 << CS10) | (1 << CS11) | (1 << CS12)); //Timer2 Set Prescaler to 5 (101), 1024 mode.
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}
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//Timer2 Overflow Interrupt Vector, called when the timer overflows.
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//SHOULD execute every ~10ms.
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ISR(TIMER2_OVF_vect)
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{
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//Increment Loop Counters
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loopGen++;
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loopSec++;
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//Loop executed every 250ms loop (10ms x 25 = 250ms)
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if (loopGen == 25)
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{
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loopGen = 0; //Reset Counter.
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//250ms Code here.
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}
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//Loop executed every 1 second (10ms x 100 = 1000ms)
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if (loopSec == 100)
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{
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loopSec = 0; //Reset counter.
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//If the engine is running or cranking, we need ot update the run time counter.
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if (((currentStatus.engine & ENGINE_RUN) || (currentStatus.engine & ENGINE_CRANK)))
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{ //NOTE - There is a potential for a ~1sec gap between engine crank starting and ths runSec number being incremented. This may delay ASE!
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if (currentStatus.runSecs <= 254) //Ensure we cap out at 255 and don't overflow. (which would reset ASE)
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currentStatus.runSecs ++; //Increment our run counter by 1 second.
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}
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//Reset Timer2 to trigger in another ~10ms
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TCNT2 = 99; //Preload timer2 with 100 cycles, leaving 156 till overflow.
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TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
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}
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}
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