MissingTeeth.c File Reference

Missing teeth, mostly 36-1 and 60-2. More...

#include "inc/freeEMS.h"
#include "inc/interrupts.h"

Include dependency graph for MissingTeeth.c:

Go to the source code of this file.

Functions
void	PrimaryRPMISR (void)
void	SecondaryRPMISR (void)
	Use the rising and falling edges...................

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Detailed Description

Missing teeth, mostly 36-1 and 60-2.

Note:

Pseudo code that does not compile with zero warnings and errors MUST be commented out.

Author:

Philip Johnson

Definition in file MissingTeeth.c.

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Function Documentation

void PrimaryRPMISR

(

void

)

Primary RPM ISR

Todo:

TODO Docs here!

Todo:

TODO possibly add code to make sure we are in divide mode, if not error out

Todo:

TODO fill in or remove the else

Definition at line 46 of file MissingTeeth.c.

References Counters, ISRLatencyVars, PORTJ, PORTP, ISRLatencyVar::primaryInputLatency, RuntimeVar::primaryInputLeadingRuntime, RuntimeVar::primaryInputTrailingRuntime, primaryPulsesPerSecondaryPulse, Counter::primaryTeethSeen, PTIT, RuntimeVars, TC0, TCNT, TFLG, TFLGOF, LongTime::timeLong, timerExtensionClock, and LongTime::timeShorts.

                         {
    static LongTime thisHighLowTime = { 0 };
    static LongTime lastHighLowTime = { 0 };
    static LongTime lowTime = { 0 };
    static LongTime lastPeriod = { 0 };
    static LongTime lastTimeStamp = { 0 };
    static unsigned int count = 0;

    /* Clear the interrupt flag for this input compare channel */
    TFLG = 0x01;

    /* Save all relevant available data here */
    unsigned short codeStartTimeStamp = TCNT; /* Save the current timer count */
    unsigned short edgeTimeStamp = TC0; /* Save the edge time stamp */
    unsigned char PTITCurrentState = PTIT; /* Save the values on port T regardless of the state of DDRT */
    //  unsigned short PORTS_BACurrentState = PORTS_BA; /* Save ignition output state */

    /* Calculate the latency in ticks */
    ISRLatencyVars.primaryInputLatency = codeStartTimeStamp - edgeTimeStamp;

    LongTime thisTimeStamp;
    /* Install the low word */
    thisTimeStamp.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 */
        thisTimeStamp.timeShorts[0] = timerExtensionClock + 1;
    } else {
        thisTimeStamp.timeShorts[0] = timerExtensionClock;
    }

    /* How many ticks between transitions? */
    LongTime thisPeriod;
    if (thisTimeStamp.timeLong > lastTimeStamp.timeLong) {
        thisPeriod.timeLong = thisTimeStamp.timeLong - lastTimeStamp.timeLong;
    } else {
        thisPeriod.timeLong = thisTimeStamp.timeLong + (0xFFFFFFFF
                - lastTimeStamp.timeLong);
    }
    lastTimeStamp.timeLong = thisTimeStamp.timeLong;

    /* Set up edges as per config */
    unsigned char risingEdge = PTITCurrentState & 0x01;

    if (lastPeriod.timeLong != 0) {
        if (risingEdge) {
            thisHighLowTime.timeLong = thisPeriod.timeLong + lowTime.timeLong;
            //Find the missing tooth
            if (count == 0 || count == 70) {
                if (thisHighLowTime.timeLong > (lastHighLowTime.timeLong + (lastHighLowTime.timeLong>>1)) &&
                        thisHighLowTime.timeLong < ((lastHighLowTime.timeLong<<1) + (lastHighLowTime.timeLong>>1))) {
                    // We have sync
                    PORTP |= 0x80;
                    count = 1;
                } else {
                    //We have lost sync
                    count = 0;
                    PORTP &= 0x7F;
                }
            }else if (count == 2 || (count%2 == 0 &&
                    thisHighLowTime.timeLong > (lastHighLowTime.timeLong>>1) &&
                    thisHighLowTime.timeLong < (lastHighLowTime.timeLong<<1) )) {
                count++;
            } else {
                //We have lost sync
                count = 0;
                PORTP &= 0x7F;
            }

            /* Echo input condition on J7 */
            PORTJ |= 0x80;
            // increment crank pulses TODO this needs to be wrapped in tooth period and width checking
            lastHighLowTime.timeLong = thisHighLowTime.timeLong;
            primaryPulsesPerSecondaryPulse++;
            RuntimeVars.primaryInputLeadingRuntime = TCNT - codeStartTimeStamp;
        } else {
            if (count%2 == 1) {
                count++;
            } else {
                //We have lost sync
                count = 0;
                PORTP &= 0x7F;
            }
            /* Echo input condition on J7 */
            PORTJ &= 0x7F;
            RuntimeVars.primaryInputTrailingRuntime = TCNT - codeStartTimeStamp;
            lowTime.timeLong = thisPeriod.timeLong;
        }
    }
    lastPeriod.timeLong = thisPeriod.timeLong;
    Counters.primaryTeethSeen++;
}

void SecondaryRPMISR

(

void

)

Use the rising and falling edges...................

Secondary RPM ISR

Todo:

TODO Docs here!

Todo:

TODO fill in or remove the else

Definition at line 143 of file MissingTeeth.c.

References fixedConfig1::coreSettingsA, Counters, fixedConfigs1, ISRLatencyVars, PORTJ, PTIT, RuntimeVars, SECONDARY_POLARITY, ISRLatencyVar::secondaryInputLatency, RuntimeVar::secondaryInputLeadingRuntime, RuntimeVar::secondaryInputTrailingRuntime, Counter::secondaryTeethSeen, TC1, TCNT, TFLG, TFLGOF, timerExtensionClock, and LongTime::timeShorts.

                           {
    /* Clear the interrupt flag for this input compare channel */
    TFLG = 0x02;

    /* Save all relevant available data here */
    unsigned short codeStartTimeStamp = TCNT; /* Save the current timer count */
    unsigned short edgeTimeStamp = TC1; /* Save the timestamp */
    unsigned char PTITCurrentState = PTIT; /* Save the values on port T regardless of the state of DDRT */
    //  unsigned short PORTS_BACurrentState = PORTS_BA; /* Save ignition output state */

    /* Calculate the latency in ticks */
    ISRLatencyVars.secondaryInputLatency = codeStartTimeStamp - edgeTimeStamp;

    // TODO discard narrow ones! test for tooth width and tooth period

    /* Set up edges as per config */
    unsigned char risingEdge;
    if (fixedConfigs1.coreSettingsA & SECONDARY_POLARITY) {
        risingEdge = PTITCurrentState & 0x02;
    } else {
        risingEdge = !(PTITCurrentState & 0x02);
    }

    if (risingEdge) {
        // echo input condition
        PORTJ |= 0x40;

        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;
        }

        RuntimeVars.secondaryInputLeadingRuntime = TCNT - codeStartTimeStamp;
    } else {
        PORTJ &= 0xBF;
        RuntimeVars.secondaryInputTrailingRuntime = TCNT - codeStartTimeStamp;
    }

    Counters.secondaryTeethSeen++;
}