LT1-360-8.c File Reference

LT1 Optispark. More...

#include "inc/freeEMS.h"
#include "inc/interrupts.h"
#include "inc/DecoderInterface.h"
#include "inc/LT1-360-8.h"

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Defines
#define	LT1_360_8_C
Functions
void	LT1PTInit (void)
void	PrimaryRPMISR (void)
void	SecondaryRPMISR (void)
	Use the rising and falling edges...................
void	changeSyncStatus (unsigned char synced)
	Change the accumulator mode to overflow every 5 inputs on PT0 making our 360 tooth wheel interrupt like a 72 tooth wheel.
Variables
unsigned short	VCAS = 0

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Detailed Description

LT1 Optispark.

Uses PT1 to interrupt on rising and falling events of the 8x cam sensor track. A certain number of 360x teeth will pass while PT1 is in a high or low state. Using that uniquek count we can set the positing of your Virtual CAS clock. After VCAS's position is set set PT7 to only interrupt on every 5th tooth, lowering the amount of interrupts generated, to a reasonable level.

Note:

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

Todo:

TODO This file contains SFA but Sean Keys is going to fill it up with

TODO wonderful goodness very soon ;-)

Author:

Sean Keys

Definition in file LT1-360-8.c.

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Define Documentation

#define LT1_360_8_C

Definition at line 48 of file LT1-360-8.c.

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Function Documentation

void changeSyncStatus

(

unsigned char

synced

)

Change the accumulator mode to overflow every 5 inputs on PT0 making our 360 tooth wheel interrupt like a 72 tooth wheel.

PT0 Accumulator Mode

Todo:

TODO Decide if an explicit parameter is necessary if not use a existing status var instead for now it's explicit.

Todo:

TODO the register below does not exist and I couldn't figure out what you meant to do...

Definition at line 216 of file LT1-360-8.c.

References PACN0, PACTL, TCTL1, and TIOS.

Referenced by SecondaryRPMISR().

                                           {
    if (synced != 1) { /* disable accumulator counter, so an ISR is fired on all 360 teeth */
        PACTL = 0x00; /* disable PAEN and PBOIV */
        /*  (PACTL) 7   6    5     4     3    2    1    0
                      PAEN PAMOD PEDGE CLK1 CLK0 PAOVI PAI */
    }else{  /* enable accumulator so an ISR is only fired on every "5th tooth of the 360x track" */
//      TIOS = TIOS &  "0xCC0x83" WTF!?LOL!! 0x80;  /* PT7 input */
//      TCTL1 = TCTL1 &  "0xCC0x83" WTF!?LOL!! 0xC0; /* Disconnect IC/OC logic from PT7 */
        TIOS = TIOS & 0x80;  /* PT7 input */
        TCTL1 = TCTL1 & 0xC0; /* Disconnect IC/OC logic from PT7 */
        PACN0 = 0xFB ; /* Calculation, $00 – $05 = $FB. This will overflow in 5 more edges. */
        PACTL = 0x52; /* Enable PA in count mode, rising edge and interrupt on overflow  01010010 */
    }
}

void LT1PTInit

(

void

)

Setup PT Capturing so that we can decode the LT1 pattern

Todo:

TODO Put this in the correct place

Definition at line 61 of file LT1-360-8.c.

                    {
    /* set pt1 to capture on rising and falling */

}

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 72 of file LT1-360-8.c.

References isSynced, PORTJ, PrimaryTeethDuringHigh, PrimaryTeethDuringLow, PTIT, TFLG, and VCAS.

                        {
    /* 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 */

//  unsigned char risingEdge; /* in LT1s case risingEdge means signal is high */
//  if(fixedConfigs1.coreSettingsA & PRIMARY_POLARITY){
//      risingEdge = PTITCurrentState & 0x01;
//  }else{
//      risingEdge = !(PTITCurrentState & 0x01);
//  }

    PORTJ |= 0x80; /* Echo input condition on J7 */
    if(!isSynced){  /* If the CAS is not in sync get window counts so SecondaryRPMISR can set position */
        if (PTITCurrentState & 0x02){
            PrimaryTeethDuringHigh++;  /* if low resolution signal is high count number of pulses */
        }else{
            PrimaryTeethDuringLow++;  /* if low resolution signal is low count number of pulses */
        }
    }else{  /* The CAS is synced and we need to update our 360/5=72 tooth wheel */
        VCAS = VCAS + 10;  /* Check/correct for 10deg of CAM movement */
    }
}

void SecondaryRPMISR

(

void

)

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

Secondary RPM ISR

Todo:

TODO Docs here!

TODO Add a check for 1 skip pulse of the 8x track, to prevent possible incorrect sync.

TODO Possibly make virtual CAS 16-bit so was can get rid of floating points and use for syncing

Todo:

TODO fill in or remove the else

Definition at line 110 of file LT1-360-8.c.

References changeSyncStatus(), fixedConfig1::coreSettingsA, Counters, Counter::crankSyncLosses, fixedConfigs1, isSynced, PORTJ, PRIMARY_POLARITY, PrimaryTeethDuringHigh, PrimaryTeethDuringLow, PTIT, TFLG, and VCAS.

                          {
    /* 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 */
    unsigned char risingEdge;
    if(fixedConfigs1.coreSettingsA & PRIMARY_POLARITY){
            risingEdge = PTITCurrentState & 0x01;
        }else{
            risingEdge = !(PTITCurrentState & 0x01);
        }
    PORTJ |= 0x40;  /* echo input condition */

    if (!isSynced & risingEdge){ /* If the CAS is not in sync get window counts and set virtual CAS position */
          /* if signal is high that means we can count the lows */
            switch (PrimaryTeethDuringLow){
            case 23: /* wheel is at 0 deg TDC #1, set our virtual CAS to tooth 0 of 720 */
            {
                VCAS = 0 ;
                changeSyncStatus((unsigned char) 1);
                break;
            }
            case 38: /* wheel is at 90 deg TDC #4, set our virtual CAS to tooth 180 of 720 */
            {
                VCAS = 180;
                changeSyncStatus((unsigned char) 1);
                break;
            }
            case 33: /* wheel is at 180 deg TDC #6 set our virtual CAS to tooth 360 of 720 */
            {
                VCAS = 360;
                changeSyncStatus((unsigned char) 1);
                break;
            }
            case 28: /* wheel is at 270 deg TDC #7 set our virtual CAS to tooth 540 of 720 */
            {
                VCAS = 540;
                changeSyncStatus((unsigned char) 1);
                break;
            }
            default :
            {
            Counters.crankSyncLosses++; /* use crankSyncLosses variable to store number of invalid count cases while attempting to sync*/
                break;
            }
            PrimaryTeethDuringLow = 0; /* In any case reset counter */
            }
        }
    if(!isSynced & !risingEdge){/* if the signal is low that means we can count the highs */
            switch (PrimaryTeethDuringHigh){   /* will need to additional code to off-set the initialization of PACNT since they are not
                                                 evenly divisible by 5 */
            case 7: /* wheel is at 52 deg, 7 deg ATDC #8 set our virtual CAS to tooth 104 of 720 */
            {

                break;
            }
            case 12: /* wheel is at 147 deg, 12 deg ATDC #3 set our virtual CAS to tooth 294 of 720 */
            {

                break;
            }
            case 17: /* wheel is at 242 deg, 17 deg ATDC #5 set our virtual CAS to tooth 484 of 720 */
            {

                break;
            }
            case 22: /* wheel is at 337 deg, 22 deg ATDC #2 set our virtual CAS to tooth 674 of 720 */
            {

                break;
            }
            default :
            {
                Counters.crankSyncLosses++; /* use crankSyncLosses variable to store number of invalid/default count cases while attempting to sync*/
                break;
            }

            }
            PrimaryTeethDuringHigh = 0;  /* In any case reset counter */
        }
    if(isSynced & risingEdge){  /* We are in sync and need to make sure our counts are good */

        /* System is synced so use adjusted count numbers to check sync */
    }
}

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Variable Documentation

unsigned short VCAS = 0

Definition at line 55 of file LT1-360-8.c.

Referenced by PrimaryRPMISR(), and SecondaryRPMISR().