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Conclude all scheduler call calculations, adjust scheduler to automatically run an end function after a set duration

This commit is contained in:
Josh Stewart 2013-02-14 23:19:34 +11:00
parent f8ccd8ac6d
commit 2e9b01c28e
2 changed files with 71 additions and 29 deletions
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38
kartduino.ino
View File

@ -6,9 +6,9 @@
/*
Need to calculate the req_fuel figure here, preferably in pre-processor macro
*/
#define engineCapacity 100 // In cc
#define engineCapacity 148 // In cc
#define engineCylinders 1 // May support more than 1 cyl later. Always will assume 1 injector per cylinder.
#define engineInjectorSize 100 // In cc/min
#define engineInjectorSize 80 // In cc/min
#define engineStoich 14.7 // Stoichiometric ratio of fuel used
#define engineStrokes 4 //Can be 2 stroke or 4 stroke, any other value will cause problems
#define engineDwell 3000 //The spark dwell time in uS
@ -111,21 +111,43 @@ void loop()
//Perform lookup into fuel map for RPM vs MAP value
int VE = getTableValue(fuelTable, MAP, rpm);
//Calculate an injector pulsewidth form the VE
int pulseWidth = PW(req_fuel, VE, MAP, 100, engineInjectorDeadTime); //The 100 here is just a placeholder for any enrichment factors (Cold start, acceleration etc). To add 10% extra fuel, this would be 110
unsigned long pulseWidth = PW(req_fuel, VE, MAP, 100, engineInjectorDeadTime); //The 100 here is just a placeholder for any enrichment factors (Cold start, acceleration etc). To add 10% extra fuel, this would be 110
//Perform a lookup to get the desired ignition advance
int advance = getTableValue(ignitionTable, MAP, rpm);
int ignitionAdvance = getTableValue(ignitionTable, MAP, rpm);
//Determine the current crank angle
int crankAngle = (toothCurrentCount - 1) * triggerToothAngle + triggerAngle; //Number of teeth that have passed since tooth 1, multiplied by the angle each tooth represents, plus the angle that tooth 1 is from TDC
if (crankAngle > 360) { crankAngle -= 360; } //Not sure if this is actually required
//Determine next firing angles
//Finally calculate the time (uS) until we reach the firing angles
//How fast are we going? Can possibly work this out from RPM, but I don't think it's going to take a lot of CPU
unsigned long timePerDegree = (toothLastToothTime - toothLastMinusOneToothTime) / triggerToothAngle; //The time (uS) it is currently taking to move 1 degree
//Determine next firing angles
int injectorStartAngle = 355 - (pulseWidth / timePerDegree); //This is a bit rough, but is based on the idea that all fuel needs to be delivered before the inlet valve opens. I am using 355 as the point at which the injector MUST be closed by. See http://www.extraefi.co.uk/sequential_fuel.html for more detail
int ignitionStartAngle = 360 - ignitionAdvance; //Simple
//Finally calculate the time (uS) until we reach the firing angles and set the schedules
//We only need to set the shcedule if we're BEFORE the open angle
//This may potentially be called a number of times as we get closer and closer to the opening time
if (injectorStartAngle > crankAngle)
{
setSchedule1(openInjector,
(injectorStartAngle - crankAngle) * timePerDegree,
pulseWidth,
closeInjector
);
}
//Likewise for the ignition
if (ignitionStartAngle > crankAngle)
{
setSchedule2(beginCoilCharge,
(ignitionStartAngle - crankAngle) * timePerDegree,
engineDwell,
endCoilCharge
);
}
//Serial.println(VE);

62
scheduler.h
View File

@ -28,10 +28,14 @@ See page 136 of the processors datasheet: http://www.atmel.com/Images/doc2549.pd
//#define clockspeed 16000000
int schedule1Active;
int schedule1Active; //Value=0 means do nothing, value=1 means call the startCallback, value=2 means call the endCallback
int schedule2Active;
void (*schedule1Callback)(); //Callback function for schedule1
void (*schedule2Callback)();
unsigned long schedule1Duration; //How long (uS) after calling the start callback to we call the end callback
unsigned long schedule2Duration;
void (*schedule1StartCallback)(); //Start Callback function for schedule1
void (*schedule2StartCallback)();
void (*schedule1EndCallback)(); //End Callback function for schedule1
void (*schedule2EndCallback)();
void initialiseScheduler()
{
@ -58,28 +62,32 @@ void initialiseScheduler()
}
/*
This turns schedule 1 on, gives it a callback functino and resets the relevant timer based on the time in the future that this should be triggered
This turns schedule 1 on, gives it callback functions and resets the relevant timer based on the time in the future that this should be triggered
Args:
callback: The function to be called once the timeout is reach
timeout: The number of uS in the future that the callback should be triggered
startCallback: The function to be called once the timeout1 is reached
timeout1: The number of uS in the future that the callback should be triggered
duration: The number of uS before endCallback is called
endCallback
*/
void setSchedule1(void (*callback)(), unsigned long timeout)
void setSchedule1(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)())
{
//We need to calculate the value to reset the timer to (preload) in order to achieve the desired overflow time
//As the timer is ticking every 16uS (Time per Tick = (Prescale)*(1/Frequency))
//TODO: Need to add check for timeout > 1048576 ????
TCNT3 = 65536 - (timeout / 16); //Each tick occurs every 16uS with a 256 prescaler so divide the timeout by 16 to get ther required number of ticks. Subtract this from the total number of tick (65536 for 16-bit timer)
//TCNT3 = 0;
schedule1Callback = callback; //Name the callback function
schedule1Active = 1; //Turn this schedule on
schedule1Duration = duration;
schedule1StartCallback = startCallback; //Name the start callback function
schedule1EndCallback = endCallback; //Name the start callback function
schedule1Active = 1; //Turn this schedule on and set it
}
//As above, but for schedule2
void setSchedule2(void (*callback)(), unsigned long timeout)
void setSchedule2(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)())
{
//TODO: Need to add check for timeout > 1048576 ????
TCNT4 = 65536 - (timeout / 16); //Each tick occurs every 16uS with a 256 prescaler so divide the timeout by 16 to get ther required number of ticks. Subtract this from the total number of tick (65536 for 16-bit timer)
schedule2Callback = callback; //Name the callback function
schedule2StartCallback = startCallback; //Name the callback function
schedule2EndCallback = endCallback; //Name the callback function
schedule2Active = 1; //Turn this schedule on
}
@ -87,25 +95,37 @@ void setSchedule2(void (*callback)(), unsigned long timeout)
//This needs to call the callback function if one has been provided and rest the timer
ISR(TIMER3_OVF_vect)
{
if (schedule1Active > 0) //Check to see if this schedule is turn on
if (schedule1Active == 1) //Check to see if this schedule is turn on
{
schedule1Callback(); //Replace with user provided callback
schedule1Active = 0; //Turn off the callback
schedule1StartCallback(); //Replace with user provided callback
schedule1Active = 2; //Turn off the callback
TCNT3 = 65536 - (schedule2Duration / 16);
}
else if (schedule1Active == 2)
{
schedule1EndCallback();
schedule1Active = 0; //Turn off the callback
TCNT3 = 0; //Reset Timer to 0 out of 255
}
TCNT3 = 0; //Reset Timer to 0 out of 255
TIFR3 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
}
//AS above for schedule2
ISR(TIMER4_OVF_vect)
{
if (schedule2Active > 0) //Check to see if this schedule is turn on
if (schedule2Active == 1) //A value of 1 means call the start callback
{
schedule2Callback(); //Replace with user provided callback
schedule2Active = 0; //Turn off the callback
schedule2StartCallback();
schedule2Active = 2; //Set to call the end callback on the next run
TCNT4 = 65536 - (schedule2Duration / 16);
}
else if (schedule2Active == 2)
{
schedule2EndCallback();
schedule2Active = 0; //Turn off the callback
TCNT4 = 0; //Reset Timer to 0 out of 255
}
TCNT3 = 0; //Reset Timer to 0 out of 255
TIFR3 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
TIFR4 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
}