injectorISR.c File Reference

Injector ISR shared code. More...

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Functions
void	InjectorXISR ()

---

Detailed Description

Injector ISR shared code.

This code is identical between all 6 channels, and thus we only want one copy of it. The X in each macro will be replaced with the number that is appropriate for the channel it is being used for at the time.

Each channel performs the following actions

• 1 Clear its interrupt flag
• 2 Record its start time
• 3 Measure and record its latency
• 4 Check to see if its just turned on
  • 4.1 Copy the channels pulse width to a local variable
  • 4.2 Determine the minimum pulse width based on code run time const and latency
  • 4.3 Clamp used pulsewidth inside min and max
  • 4.4 If used pulse width is larger than the current period of the engines cycle flag as always on
  • 4.5 Set the action to turn off
  • 4.6 Increment the time by pulse width
  • 4.7 If staging required, either, switch them on and sched to turn off, or sched to turn on
• 5 Else it has just turned off
  • 5.1 If staged channel is still on, turn it off
  • 5.2 If(self schedule flagged) schedule the next start
  • 5.3 Else disable itself
• 6 Calculate and record code run time
• 7 Return

Author:

Fred Cooke

Definition in file injectorISR.c.

---

Function Documentation

void InjectorXISR

(

)

Todo:

TODO *maybe* instead of checking min and increasing pulse, just force it straight off if diff between start and now+const is greater than desired pulsewidth

Todo:

TODO PIT scheduling of staged start

Definition at line 59 of file injectorISR.c.

References fixedConfig1::coreSettingsA, coreStatusA, fixedConfigs1, INJECTOR_CHANNEL_NUMBER, injectorCodeCloseRuntimes, injectorCodeLatencies, injectorCodeOpenRuntimes, injectorMainControlRegisters, injectorMainDisableMasks, injectorMainEndTimes, injectorMainGoHighMasks, injectorMainGoLowMasks, injectorMainOffMasks, injectorMainOnMasks, injectorMainPulseWidthsRealtime, injectorMainStartTimesHolding, injectorMainTimeRegisters, injectorSwitchOnCodeTime, PTIT, selfSetTimer, STAGED_REQUIRED, STAGED_START, stagedOn, STAGEDPORT, STAGEDXOFF, STAGEDXON, TCNT, TFLG, TFLGOF, TIE, LongTime::timeLong, timerExtensionClock, and LongTime::timeShorts.

                   {
    /* Clear the interrupt flag for this channel */
    TFLG = injectorMainOnMasks[INJECTOR_CHANNEL_NUMBER];

    /* Record the current time as start time */
    unsigned short TCNTStart = TCNT;

    /* Record the edge time stamp from the IC register */
    unsigned short edgeTimeStamp = *injectorMainTimeRegisters[INJECTOR_CHANNEL_NUMBER];

    /* Calculate and store the latency based on compare time and start time */
    injectorCodeLatencies[INJECTOR_CHANNEL_NUMBER] = TCNTStart - edgeTimeStamp;

    /* If rising edge triggered this */
    if(PTIT & injectorMainOnMasks[INJECTOR_CHANNEL_NUMBER]){ // Stuff for switch on time

        /* Find out what max and min for pulse width are */
        unsigned short localPulseWidth = injectorMainPulseWidthsRealtime[INJECTOR_CHANNEL_NUMBER];
        unsigned short localMinimumPulseWidth = injectorSwitchOnCodeTime + injectorCodeLatencies[INJECTOR_CHANNEL_NUMBER];

        /* Ensure we dont go under minimum pulsewidth */
        if(localPulseWidth < localMinimumPulseWidth){
            localPulseWidth = localMinimumPulseWidth;
        }/* else{ just use the value } */

        LongTime timeStamp;

        /* Install the low word */
        timeStamp.timeShorts[1] = edgeTimeStamp;
        /* Find out what our timer value means and put it in the high word */
        if(TFLGOF && !(edgeTimeStamp & 0x8000)){ /* see 10.3.5 paragraph 4 of 68hc11 ref manual for details */
            timeStamp.timeShorts[0] = timerExtensionClock + 1;
        }else{
            timeStamp.timeShorts[0] = timerExtensionClock;
        }

        // store the end time for use in the scheduler
        injectorMainEndTimes[INJECTOR_CHANNEL_NUMBER] = timeStamp.timeLong + localPulseWidth;

        /* Set the action for compare to switch off FIRST or it might inadvertently PWM the injector during opening... */
        *injectorMainControlRegisters[INJECTOR_CHANNEL_NUMBER] &= injectorMainGoLowMasks[INJECTOR_CHANNEL_NUMBER];

        /* Set the time to turn off again */
        *injectorMainTimeRegisters[INJECTOR_CHANNEL_NUMBER] += localPulseWidth;

        /* This is the point we actually want the time to, but because the code is so simple, it can't help but be a nice short time */

        /* If staged injection is required, switch on or schedule corresponding staged injector and remember that we did. */
        if(coreStatusA & STAGED_REQUIRED){
            if(fixedConfigs1.coreSettingsA & STAGED_START){
                /* Switch that channel on NOW */
                STAGEDPORT |= STAGEDXON;
                stagedOn |= STAGEDXON;
            }else{
                /* Schedule the start at a later time */
            }
        }
        /* Calculate and store code run time */
        injectorCodeOpenRuntimes[INJECTOR_CHANNEL_NUMBER] = TCNT - TCNTStart;
    }else{ // Stuff for switch off time
        /* If we switched the staged injector on and it's still on, turn it off now. */
        if(stagedOn & STAGEDXON){
            STAGEDPORT &= STAGEDXOFF;
            stagedOn &= STAGEDXOFF;
        }

        /* Set the action for compare to switch on and the time to next start time, clear the self timer flag */
        if(selfSetTimer & injectorMainOnMasks[INJECTOR_CHANNEL_NUMBER]){
            *injectorMainTimeRegisters[INJECTOR_CHANNEL_NUMBER] = injectorMainStartTimesHolding[INJECTOR_CHANNEL_NUMBER];
            *injectorMainControlRegisters[INJECTOR_CHANNEL_NUMBER] |= injectorMainGoHighMasks[INJECTOR_CHANNEL_NUMBER];
            selfSetTimer &= injectorMainOffMasks[INJECTOR_CHANNEL_NUMBER];
        }else{
            // Disable interrupts and actions incase the period from this end to the next start is long (saves cpu)
            TIE &= injectorMainOffMasks[INJECTOR_CHANNEL_NUMBER];
            *injectorMainControlRegisters[INJECTOR_CHANNEL_NUMBER] &= injectorMainDisableMasks[INJECTOR_CHANNEL_NUMBER];
        }
        /* Calculate and store code run time */
        injectorCodeCloseRuntimes[INJECTOR_CHANNEL_NUMBER] = TCNT - TCNTStart;
    }
}