93 lines
4.6 KiB
C
93 lines
4.6 KiB
C
/*
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This scheduler is designed to maintain 2 schedules for use by the fuel and ignition systems.
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It functions by waiting for the overflow vectors from each of the timers in use to overflow, which triggers an interrupt
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//Technical
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Currently I am prescaling the 16-bit timers to 256 for injection and 64 for ignition. This means that the counter increments every 16us (injection) / 4uS (ignition) and will overflow every 1048576uS
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Max Period = (Prescale)*(1/Frequency)*(2^17)
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(See http://playground.arduino.cc/code/timer1)
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This means that the precision of the scheduler is 16uS (+/- 8uS of target) for fuel and 4uS (+/- 2uS) for ignition
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/Features
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This differs from most other schedulers in that its calls are non-recurring (IE You schedule an event at a certain time and once it has occurred, it will not reoccur unless you explicitely ask for it)
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Each timer can have only 1 callback associated with it at any given time. If you call the setCallback function a 2nd time, the original schedule will be overwritten and not occur
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Timer identification
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The Arduino timer3 is used for schedule 1
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The Arduino timer4 is used for schedule 2
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Both of these are 16-bit timers (ie count to 65536)
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See page 136 of the processors datasheet: http://www.atmel.com/Images/doc2549.pdf
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256 prescale gives tick every 16uS
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256 prescale gives overflow every 1048576uS (This means maximum wait time is 1.0485 seconds)
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*/
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#ifndef SCHEDULER_H
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#define SCHEDULER_H
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#ifdef __SAM3X8E__
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//Do stuff for ARM based CPUs
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#else
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#endif
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void initialiseSchedulers();
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void setFuelSchedule1(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule2(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule3(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule4(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule5(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule6(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule7(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setFuelSchedule8(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule1(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule2(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule3(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule4(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule5(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule6(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule7(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setIgnitionSchedule8(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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enum ScheduleStatus {OFF, PENDING, RUNNING}; //The 3 statuses that a schedule can have
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struct Schedule {
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volatile unsigned long duration;
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volatile ScheduleStatus Status;
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volatile byte schedulesSet; //A counter of how many times the schedule has been set
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void (*StartCallback)(); //Start Callback function for schedule
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void (*EndCallback)(); //Start Callback function for schedule
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volatile unsigned long startTime; //The system time (in uS) that the schedule started
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unsigned int startCompare; //The counter value of the timer when this will start
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unsigned int endCompare;
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};
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struct timerCompareManager {
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volatile Schedule *currentSchedule;
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volatile Schedule *nextSchedule;
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};
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Schedule fuelSchedule1;
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Schedule fuelSchedule2;
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Schedule fuelSchedule3;
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Schedule fuelSchedule4;
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Schedule fuelSchedule5;
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Schedule fuelSchedule6;
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Schedule fuelSchedule7;
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Schedule fuelSchedule8;
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Schedule ignitionSchedule1;
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Schedule ignitionSchedule2;
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Schedule ignitionSchedule3;
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Schedule ignitionSchedule4;
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Schedule ignitionSchedule5;
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Schedule ignitionSchedule6;
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Schedule ignitionSchedule7;
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Schedule ignitionSchedule8;
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timerCompareManager timer3compareA;
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timerCompareManager timer3compareB;
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timerCompareManager timer3compareC;
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#endif // SCHEDULER_H
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