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Timer port
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33
DCCTimer.cpp
33
DCCTimer.cpp
@ -38,17 +38,36 @@ INTERRUPT_CALLBACK interruptHandler=0;
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void DCCTimer::begin(INTERRUPT_CALLBACK callback, bool slow) {
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interruptHandler=callback;
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// Initialise timer1 to trigger every 58us (DCC_SIGNAL_TIME)
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long clockCycles=((F_CPU / 1000000) * (slow? DCC_SLOW_TIME : DCC_SIGNAL_TIME)) >>1;
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noInterrupts();
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TCCR1A = 0;
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ICR1 = ((F_CPU / 1000000) * (slow? DCC_SLOW_TIME : DCC_SIGNAL_TIME)) >>1;
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TCNT1 = 0;
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TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1
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TIMSK1 = _BV(TOIE1); // Enable Software interrupt
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#ifdef ARDUINO_ARCH_MEGAAVR
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// Arduino unoWifi Rev2 and nanoEvery architectire
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TCB0.CCMP = clockCycles;
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TCB0.INTFLAGS = TCB_CAPT_bm; // clear interrupt request flag
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TCB0.INTCTRL = TCB_CAPT_bm; // Enable the interrupt
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TCB0.CNT = 0;
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TCB0.CTRLA |= TCB_ENABLE_bm; // start
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#define ISR_NAME TCB2_INT_vect
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#else
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// Arduino nano, uno, mega
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TCCR1A = 0;
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ICR1 = clockCycles;
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TCNT1 = 0;
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TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1
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TIMSK1 = _BV(TOIE1); // Enable Software interrupt
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#define ISR_NAME TIMER1_OVF_vect
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#endif
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interrupts();
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}
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// Timer interrupt every 58uS
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ISR(TIMER1_OVF_vect)
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// ISR called by timer interrupt every 58uS
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ISR(ISR_NAME)
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{
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#ifdef ARDUINO_ARCH_MEGAAVR
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TCB0.INTFLAGS = TCB_CAPT_bm;
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#endif
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if (interruptHandler) interruptHandler();
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}
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