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void init_pit_timer(void){
	/*  */
	// set micro periods
	PITMTLD0 = 0x1F; // approx 50ms
	PITMTLD1 = 0x1F; // ditto
	// set timers running
//	PITLD0 = dwellPeriod;
	// enable module
	PITCFLMT = 0x80;
	// enable channels
	PITCE = 0x03;
	// enable interrupt
//	PITINTE = 0x01;
	// clear flags
	PITFLT = ONES;
}

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void IgnitionDwellISR(void)
{
	// clear flag
	PITTF = DWELL_ENABLE;

	// turn off the int
	PITINTE &= DWELL_DISABLE;
	
	// start dwelling
	PORTS_BA |= dwellStartMasks[nextDwellChannel];

	// blink a led
	PORTS ^= 0x80;
}

// TODO add in self schedule stuff for igntion timers, add in delay / latency corrections for that.

void IgnitionFireISR(void)
{
	// clear the flag
	PITTF = IGNITION_ENABLE;

	// turn off the int
	PITINTE &= IGNITION_DISABLE;
	
	// fire the coil
	PORTS_BA &= ignitionMasks[nextIgnitionChannel];

	// blink a led
	PORTS ^= 0x40;
}

Code: Select all

			/* Schedule Dwell event (do this first because it comes earliest. */
			/* Schedule Ignition event (do this first because it comes earliest. */
			// set the channel to fire
			nextDwellChannel = ignitionChannel;
			// set the channel to fire
			nextIgnitionChannel = ignitionChannel;
			
			// set the time
			PITLD0 = ignitionAdvances[ignitionChannel + outputBankIgnitionOffset] - currentDwell[outputBank];
			// figure out the time to set the delay reg to
			PITLD1 = ignitionAdvances[ignitionChannel + outputBankIgnitionOffset];
			
			// force load micro timer
			PITCFLMT |= 0x03; 
			// force load of that time 
			PITFLT |= DWELL_ENABLE;
			// force load of that time 
			PITFLT |= IGNITION_ENABLE;

			// turn on the ints
			PITINTE |= (IGNITION_ENABLE | DWELL_ENABLE);
			// clear the flags
			PITTF |= (IGNITION_ENABLE | DWELL_ENABLE);
			
			
			
			
			
			// issue lies here somewhere! TODO fix PIT operation.