mirror of https://github.com/rusefi/speeduino.git
44 lines
2.1 KiB
C
44 lines
2.1 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. This means that the counter increments every 16us 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)
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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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#include <avr/interrupt.h>
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#include <avr/io.h>
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//#define clockspeed 16000000
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int schedule1Active; //Value=0 means do nothing, value=1 means call the startCallback, value=2 means call the endCallback
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int schedule2Active;
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unsigned long schedule1Duration; //How long (uS) after calling the start callback to we call the end callback
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unsigned long schedule2Duration;
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void (*schedule1StartCallback)(); //Start Callback function for schedule1
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void (*schedule2StartCallback)();
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void (*schedule1EndCallback)(); //End Callback function for schedule1
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void (*schedule2EndCallback)();
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void initialiseScheduler();
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void setSchedule1(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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void setSchedule2(void (*startCallback)(), unsigned long timeout, unsigned long duration, void(*endCallback)());
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