MitsiAndMazda-CAS-4and1.c File Reference

Reads Mitsi 4 and 1 CAS units. More...

#include "inc/MitsiAndMazda-CAS-4and1.h"

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Macros
#define	DECODER_IMPLEMENTATION_C

Functions
void	decoderInitPreliminary ()
void	perDecoderReset ()
void	PrimaryRPMISR ()
	RPM ISRs, IC timer for engine position and RPM.
void	SecondaryRPMISR ()
	RPM ISRs, IC timer for engine position and RPM.

Detailed Description

Reads Mitsi 4 and 1 CAS units.

Two interrupts share state and cross communicate to find and maintain sync and position information.

Development thread: http://forum.diyefi.org/viewtopic.php?f=56&t=1078

Definition in file MitsiAndMazda-CAS-4and1.c.

Macro Definition Documentation

#define DECODER_IMPLEMENTATION_C

Definition at line 27 of file MitsiAndMazda-CAS-4and1.c.

Function Documentation

void decoderInitPreliminary

(

void

)

Todo:

TODO Perhaps use some of the space freed by shrinking all timing tables for this: /unsigned long wheelEventTimeStamps[numberOfWheelEvents]; // For logging wheel patterns as observed

Definition at line 31 of file MitsiAndMazda-CAS-4and1.c.

{} // This decoder works with the defaults

void perDecoderReset

(

void

)

Definition at line 32 of file MitsiAndMazda-CAS-4and1.c.

References unknownLeadingEdges.

                      {
    unknownLeadingEdges = 0;
}

void PrimaryRPMISR

(

void

)

RPM ISRs, IC timer for engine position and RPM.

There are multiple copies of this interrupt handler, each is linked with the rest of the code once such that if there are N decoder implementations and/or variants, then there are N loadable binaries produced after a full build.

For details on any specific decoder implementation, see the documentation for that specific file.

Definition at line 51 of file MitsiAndMazda-CAS-4and1.c.

References decoderSetting::accelerationInputEventTimeTolerance, ADCBuffers, BIT0, CALC_FUEL_IGN, CAM_SYNC, Clocks, coreStatusA, Counters, KeyUserDebug::currentEvent, DEBUG_TURN_PIN_OFF, DEBUG_TURN_PIN_ON, decoderSetting::decelerationInputEventTimeTolerance, DECODER_BENCHMARKS, KeyUserDebug::decoderFlags, fixedConfig2::decoderSettings, edgeTimeStamp, eventAngles, fixedConfigs2, KeyUserDebug::inputEventTimeTolerance, KeyUserDebugs, LAST_PERIOD_VALID, LAST_TIMESTAMP_VALID, lastEventTimeStamp, lastTicksPerDegree, NBIT0, numberOfRealEvents, OK_TO_SCHEDULE, PORTB, PRIMARY_EVENT_ARRIVED_TOO_EARLY, PRIMARY_EVENT_ARRIVED_TOO_LATE, KeyUserDebug::primaryTeethSeen, PTIT, resetToNonRunningState(), sampleEachADC(), SET_SYNC_LEVEL_TO, STATE_MISMATCH_IN_PRIMARY_RPM_ISR, Counter::syncedADCreadings, TC0, TFLG, TFLGOF, ticks_per_degree_multiplier, ticksPerDegreeRecord, LongTime::timeLong, Clock::timeoutADCreadingClock, timerExtensionClock, LongTime::timeShorts, timeStamp, totalEventAngleRange, and unknownLeadingEdges.

                    {
    /* Clear the interrupt flag for this input compare channel */
    TFLG = 0x01;
    DEBUG_TURN_PIN_ON(DECODER_BENCHMARKS, BIT0, PORTB);

    /* Save all relevant available data here */
    edgeTimeStamp = TC0;                   /* Save the edge time stamp */
    unsigned char PTITCurrentState = PTIT; /* Save the values on port T regardless of the state of DDRT */

    KeyUserDebugs.primaryTeethSeen++;

    /* 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;
    }
    unsigned long thisEventTimeStamp = timeStamp.timeLong;

    unsigned long thisInterEventPeriod = 0;
    if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){
        thisInterEventPeriod = thisEventTimeStamp - lastEventTimeStamp;
    }

    // Pins 0, 2, 4 and 7 - no need to check for numbers, just always do on rising edge and only in primary isr
    // Always sample in this ISR
    sampleEachADC(ADCBuffers);
    Counters.syncedADCreadings++;

    // Set flag to say calc required
    coreStatusA |= CALC_FUEL_IGN;

    // Reset the clock for reading timeout
    Clocks.timeoutADCreadingClock = 0;

    // Determine the correct event based on post transition state
    unsigned char correctEvent = 0;
    if(PTITCurrentState & 0x01){
        if(!(PTITCurrentState & 0x02)){
            correctEvent = 8;
        }
    }else{
        if(PTITCurrentState & 0x02){
            unknownLeadingEdges++;
            if(unknownLeadingEdges == 3){
                correctEvent = 4;
            }
        }else{
            correctEvent = 7;
            unknownLeadingEdges = 0;
        }
    }

    unsigned char lastEvent = 0;
    if(KeyUserDebugs.decoderFlags & CAM_SYNC){
        lastEvent = KeyUserDebugs.currentEvent;
        KeyUserDebugs.currentEvent++;
        if(KeyUserDebugs.currentEvent == numberOfRealEvents){
            KeyUserDebugs.currentEvent = 0;
        }

        // ...and, if known, check that it's correct
        if(correctEvent != 0){
            if(KeyUserDebugs.currentEvent != correctEvent){
                resetToNonRunningState(STATE_MISMATCH_IN_PRIMARY_RPM_ISR);
                return;
            }else if(!(KeyUserDebugs.decoderFlags & OK_TO_SCHEDULE)){
                SET_SYNC_LEVEL_TO(CAM_SYNC);
            } // Else do nothing, we're running!
        }
    }else if(correctEvent != 0){
        KeyUserDebugs.currentEvent = correctEvent;
        lastEvent = KeyUserDebugs.currentEvent - 1;
        SET_SYNC_LEVEL_TO(CAM_SYNC);
    }

    unsigned short thisTicksPerDegree = 0;
    if(KeyUserDebugs.decoderFlags & CAM_SYNC){
        unsigned short thisAngle = 0;
        if(KeyUserDebugs.currentEvent == 0){
            thisAngle = eventAngles[KeyUserDebugs.currentEvent] + totalEventAngleRange - eventAngles[lastEvent] ; // Optimisable... leave readable for now! :-p J/K learn from this...
        }else{
            thisAngle = eventAngles[KeyUserDebugs.currentEvent] - eventAngles[lastEvent];
        }

        thisTicksPerDegree = (unsigned short)((ticks_per_degree_multiplier * thisInterEventPeriod) / thisAngle); // with current scale range for 60/12000rpm is largest ticks per degree = 3472, smallest = 17 with largish error

        if(KeyUserDebugs.decoderFlags & LAST_PERIOD_VALID){
            unsigned short ratioBetweenThisAndLast = (unsigned short)(((unsigned long)lastTicksPerDegree * 1000) / thisTicksPerDegree);
            KeyUserDebugs.inputEventTimeTolerance = ratioBetweenThisAndLast;
            if(ratioBetweenThisAndLast > fixedConfigs2.decoderSettings.decelerationInputEventTimeTolerance){
                resetToNonRunningState(PRIMARY_EVENT_ARRIVED_TOO_LATE);
                return;
            }else if(ratioBetweenThisAndLast < fixedConfigs2.decoderSettings.accelerationInputEventTimeTolerance){
                resetToNonRunningState(PRIMARY_EVENT_ARRIVED_TOO_EARLY);
                return;
            }else{
                if(PTITCurrentState & 0x01){
                    // TODO Calculate RPM from last primaryLeadingEdgeTimeStamp
                }else{
                    // TODO Calculate RPM from last primaryTrailingEdgeTimeStamp
                }
            }
        }/*else*/ if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){ // TODO temp for testing just do rpm this way, fill above out later.
            *ticksPerDegreeRecord = thisTicksPerDegree;
        }
    }

    SCHEDULE_ECT_OUTPUTS();

    OUTPUT_COARSE_BBS();

    if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){
        lastTicksPerDegree = thisTicksPerDegree;
        KeyUserDebugs.decoderFlags |= LAST_PERIOD_VALID;
    }
    // Always
    lastEventTimeStamp = thisEventTimeStamp;
    KeyUserDebugs.decoderFlags |= LAST_TIMESTAMP_VALID;

    DEBUG_TURN_PIN_OFF(DECODER_BENCHMARKS, NBIT0, PORTB);
}

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void SecondaryRPMISR

(

void

)

RPM ISRs, IC timer for engine position and RPM.

There are multiple copies of this interrupt handler, each is linked with the rest of the code once such that if there are N decoder implementations and/or variants, then there are N loadable binaries produced after a full build.For details on any specific decoder implementation, see the documentation for that specific file.

Definition at line 177 of file MitsiAndMazda-CAS-4and1.c.

References decoderSetting::accelerationInputEventTimeTolerance, ADCBuffers, BIT1, CALC_FUEL_IGN, CAM_SYNC, Clocks, coreStatusA, Counters, KeyUserDebug::currentEvent, DEBUG_TURN_PIN_OFF, DEBUG_TURN_PIN_ON, decoderSetting::decelerationInputEventTimeTolerance, DECODER_BENCHMARKS, KeyUserDebug::decoderFlags, fixedConfig2::decoderSettings, edgeTimeStamp, eventAngles, fixedConfigs2, KeyUserDebug::inputEventTimeTolerance, KeyUserDebugs, LAST_PERIOD_VALID, LAST_TIMESTAMP_VALID, lastEventTimeStamp, lastTicksPerDegree, NBIT1, OK_TO_SCHEDULE, PORTB, PTIT, resetToNonRunningState(), sampleEachADC(), SECONDARY_EVENT_ARRIVED_TOO_EARLY, SECONDARY_EVENT_ARRIVED_TOO_LATE, KeyUserDebug::secondaryTeethSeen, SET_SYNC_LEVEL_TO, STATE_MISMATCH_IN_SECONDARY_RPM_ISR, Counter::syncedADCreadings, TC1, TFLG, TFLGOF, ticks_per_degree_multiplier, ticksPerDegreeRecord, LongTime::timeLong, Clock::timeoutADCreadingClock, timerExtensionClock, LongTime::timeShorts, and timeStamp.

                      {
    // Reads the inner slot on the disk.

    /* Clear the interrupt flag for this input compare channel */
    TFLG = 0x02;
    DEBUG_TURN_PIN_ON(DECODER_BENCHMARKS, BIT1, PORTB);

    /* Save all relevant available data here */
    edgeTimeStamp = TC1;                   /* Save the timestamp */
    unsigned char PTITCurrentState = PTIT; /* Save the values on port T regardless of the state of DDRT */

    KeyUserDebugs.secondaryTeethSeen++;
    // remember that this is both edges, though... 8 per cycle, 4 per rev for the outter wheel, 2/1 for this wheel.

    /* 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;
    }
    unsigned long thisEventTimeStamp = timeStamp.timeLong;

    unsigned long thisInterEventPeriod = 0;
    if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){
        thisInterEventPeriod = thisEventTimeStamp - lastEventTimeStamp;
    }

    // Determine the correct event based on post transition state (and toggle debug pins)
    unsigned char correctEvent;
    if(PTITCurrentState & 0x02){
        correctEvent = 9;
    }else{
        correctEvent = 6;
    }

    // Only sample if not synced, cleans up readings.
    if(!(KeyUserDebugs.decoderFlags & CAM_SYNC)){
        sampleEachADC(ADCBuffers);
        Counters.syncedADCreadings++;

        // Set flag to say calc required
        coreStatusA |= CALC_FUEL_IGN;

        // Reset the clock for reading timeout
        Clocks.timeoutADCreadingClock = 0;
    }

    unsigned char lastEvent = 0;
    if(KeyUserDebugs.decoderFlags & CAM_SYNC){
        lastEvent = KeyUserDebugs.currentEvent;
        KeyUserDebugs.currentEvent++;

        // ...and check that it's correct
        if(KeyUserDebugs.currentEvent != correctEvent){
            resetToNonRunningState(STATE_MISMATCH_IN_SECONDARY_RPM_ISR);
            return;
        }else if(!(KeyUserDebugs.decoderFlags & OK_TO_SCHEDULE)){
            SET_SYNC_LEVEL_TO(CAM_SYNC);
        } // Else do nothing, we're running!
    }else{ // If not synced, sync, as in this ISR we always know where we are.
        KeyUserDebugs.currentEvent = correctEvent;
        lastEvent = KeyUserDebugs.currentEvent - 1;
        SET_SYNC_LEVEL_TO(CAM_SYNC);
    }

    unsigned short thisTicksPerDegree = 0;
    if(KeyUserDebugs.decoderFlags & CAM_SYNC){
        unsigned short thisAngle = eventAngles[KeyUserDebugs.currentEvent] - eventAngles[lastEvent];

        thisTicksPerDegree = (unsigned short)((ticks_per_degree_multiplier * thisInterEventPeriod) / thisAngle); // with current scale range for 60/12000rpm is largest ticks per degree = 3472, smallest = 17 with largish error

        if(KeyUserDebugs.decoderFlags & LAST_PERIOD_VALID){
            unsigned short ratioBetweenThisAndLast = (unsigned short)(((unsigned long)lastTicksPerDegree * 1000) / thisTicksPerDegree);
            KeyUserDebugs.inputEventTimeTolerance = ratioBetweenThisAndLast;
            if(ratioBetweenThisAndLast > fixedConfigs2.decoderSettings.decelerationInputEventTimeTolerance){
                resetToNonRunningState(SECONDARY_EVENT_ARRIVED_TOO_LATE);
                return;
            }else if(ratioBetweenThisAndLast < fixedConfigs2.decoderSettings.accelerationInputEventTimeTolerance){
                resetToNonRunningState(SECONDARY_EVENT_ARRIVED_TOO_EARLY);
                return;
            }
        }/*else*/ if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){
            *ticksPerDegreeRecord = thisTicksPerDegree;
        }
    }

    SCHEDULE_ECT_OUTPUTS();

    OUTPUT_COARSE_BBS();

    if(KeyUserDebugs.decoderFlags & LAST_TIMESTAMP_VALID){
        lastTicksPerDegree = thisTicksPerDegree;
        KeyUserDebugs.decoderFlags |= LAST_PERIOD_VALID;
    }
    // Always
    lastEventTimeStamp = thisEventTimeStamp;
    KeyUserDebugs.decoderFlags |= LAST_TIMESTAMP_VALID;

    DEBUG_TURN_PIN_OFF(DECODER_BENCHMARKS, NBIT1, PORTB);
}

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