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Timer port

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This commit is contained in:
Asbelos 2021-01-25 20:20:41 +00:00
parent 8a9feaef22
commit cbb039c02f
1 changed files with 26 additions and 7 deletions
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25
DCCTimer.cpp
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@ -38,17 +38,36 @@ INTERRUPT_CALLBACK interruptHandler=0;
void DCCTimer::begin(INTERRUPT_CALLBACK callback, bool slow) { void DCCTimer::begin(INTERRUPT_CALLBACK callback, bool slow) {
interruptHandler=callback; interruptHandler=callback;
// Initialise timer1 to trigger every 58us (DCC_SIGNAL_TIME) // Initialise timer1 to trigger every 58us (DCC_SIGNAL_TIME)
long clockCycles=((F_CPU / 1000000) * (slow? DCC_SLOW_TIME : DCC_SIGNAL_TIME)) >>1;
noInterrupts(); noInterrupts();
#ifdef ARDUINO_ARCH_MEGAAVR
// Arduino unoWifi Rev2 and nanoEvery architectire
TCB0.CCMP = clockCycles;
TCB0.INTFLAGS = TCB_CAPT_bm; // clear interrupt request flag
TCB0.INTCTRL = TCB_CAPT_bm; // Enable the interrupt
TCB0.CNT = 0;
TCB0.CTRLA |= TCB_ENABLE_bm; // start
#define ISR_NAME TCB2_INT_vect
#else
// Arduino nano, uno, mega
TCCR1A = 0; TCCR1A = 0;
ICR1 = ((F_CPU / 1000000) * (slow? DCC_SLOW_TIME : DCC_SIGNAL_TIME)) >>1; ICR1 = clockCycles;
TCNT1 = 0; TCNT1 = 0;
TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1 TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1
TIMSK1 = _BV(TOIE1); // Enable Software interrupt TIMSK1 = _BV(TOIE1); // Enable Software interrupt
#define ISR_NAME TIMER1_OVF_vect
#endif
interrupts(); interrupts();
} }
// Timer interrupt every 58uS // ISR called by timer interrupt every 58uS
ISR(TIMER1_OVF_vect) ISR(ISR_NAME)
{ {
#ifdef ARDUINO_ARCH_MEGAAVR
TCB0.INTFLAGS = TCB_CAPT_bm;
#endif
if (interruptHandler) interruptHandler(); if (interruptHandler) interruptHandler();
} }