123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
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/*
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DueTimer.h - DueTimer header file, definition of methods and attributes...
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For instructions, go to https://github.com/ivanseidel/DueTimer
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Created by Ivan Seidel Gomes, March, 2013.
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Modified by Philipp Klaus, June 2013.
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Released into the public domain.
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*/
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#include "Arduino.h"
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#if defined(_SAM3XA_)
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#ifndef DueTimer_h
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#define DueTimer_h
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#include <inttypes.h>
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/*
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This fixes compatibility for Arduono Servo Library.
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Uncomment to make it compatible.
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Note that:
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+ Timers: 0,2,3,4,5 WILL NOT WORK, and will
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neither be accessible by Timer0,...
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*/
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// #define USING_SERVO_LIB true
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#ifdef USING_SERVO_LIB
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#warning "HEY! You have set flag USING_SERVO_LIB. Timer0, 2,3,4 and 5 are not available"
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#endif
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#if defined TC2
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#define NUM_TIMERS 9
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#else
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#define NUM_TIMERS 6
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#endif
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class DueTimer
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{
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protected:
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// Represents the timer id (index for the array of Timer structs)
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const unsigned short timer;
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// Stores the object timer frequency
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// (allows to access current timer period and frequency):
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static double _frequency[NUM_TIMERS];
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// Picks the best clock to lower the error
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static uint8_t bestClock(double frequency, uint32_t& retRC);
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// Make Interrupt handlers friends, so they can use callbacks
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friend void TC0_Handler(void);
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friend void TC1_Handler(void);
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friend void TC2_Handler(void);
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friend void TC3_Handler(void);
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friend void TC4_Handler(void);
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friend void TC5_Handler(void);
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#if NUM_TIMERS > 6
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friend void TC6_Handler(void);
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friend void TC7_Handler(void);
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friend void TC8_Handler(void);
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#endif
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static void (*callbacks[NUM_TIMERS])();
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struct Timer
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{
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Tc *tc;
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uint32_t channel;
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IRQn_Type irq;
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};
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// Store timer configuration (static, as it's fixed for every object)
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static const Timer Timers[NUM_TIMERS];
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public:
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static DueTimer getAvailable(void);
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DueTimer(unsigned short _timer);
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DueTimer& attachInterrupt(void (*isr)());
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DueTimer& detachInterrupt(void);
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DueTimer& start(double microseconds = -1);
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DueTimer& stop(void);
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DueTimer& setFrequency(double frequency);
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DueTimer& setPeriod(double microseconds);
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double getFrequency(void) const;
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double getPeriod(void) const;
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inline __attribute__((always_inline)) bool operator== (const DueTimer& rhs) const
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{return timer == rhs.timer; };
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inline __attribute__((always_inline)) bool operator!= (const DueTimer& rhs) const
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{return timer != rhs.timer; };
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};
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// Just to call Timer.getAvailable instead of Timer::getAvailable() :
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extern DueTimer Timer;
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extern DueTimer Timer1;
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// Fix for compatibility with Servo library
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#ifndef USING_SERVO_LIB
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extern DueTimer Timer0;
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extern DueTimer Timer2;
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extern DueTimer Timer3;
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extern DueTimer Timer4;
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extern DueTimer Timer5;
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#endif
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#if NUM_TIMERS > 6
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extern DueTimer Timer6;
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extern DueTimer Timer7;
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extern DueTimer Timer8;
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#endif
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#endif
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#else
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#error Oops! Trying to include DueTimer on another device?
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#endif
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