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‎avdweb_SAMDtimer.cpp‎

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/*
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Copyright (C) 2012 Albert van Dalen http://www.avdweb.nl
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This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License at http://www.gnu.org/licenses .
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Version 26-1-2017
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16 bit timer: max period_us = 1398080us (0.7Hz), min period_us = 1us (1MHz)
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note *1 SCK, MOSI, MISO are on Arduino Zero SPI header
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Timer Arduino Zero pins SAM15x15 pins
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SAMDtimer 0 8bit D3 D18/A4 D17 D4 d[9] d[5] d[4] d[8] timer not yet implemented
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SAMDtimer 0 16bit D3 D18/A4 d[9] d[5] timer not yet implemented
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SAMDtimer 1 8bit D0 D9 D33 D8 D1 D30 d[11] d[7] d[31] d[6] d[10] d[27] timer not yet implemented
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SAMDtimer 1 16bit D0 D9 D33 d[11] d[7] d[31] timer not yet implemented
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SAMDtimer 2 8bit D13 (D28) D22/MISO*1 D16 d[19] d[15] d[14] d[3] timer not yet implemented
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SAMDtimer 2 16bit D13 (D28) d[19] d[15] timer not yet implemented
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SAMDtimer 3 8bit D5 D12 D2 D10 d[17] d[21] d[16] d[20] timer not yet implemented
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SAMDtimer 3 16bit D5 D12 d[17] d[21]
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SAMDtimer 4 8bit D16/A2 D21/SCL D15/A1 D20/SDA d[3] d[25] d[2] d[24] timer not yet implemented
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SAMDtimer 4 16bit D16/A2 D21/SCL d[3] d[25]
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SAMDtimer 5 8bit D24/SCK*1 D23/MOSI*1 d[13] d[12] timer not yet implemented
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SAMDtimer 5 16bit D24/SCK*1 d[13]
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*/
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#include "avdweb_SAMDtimer.h"
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SAMDtimer::SAMDtimer(byte timerNr, tc_counter_size countersize, byte pin, unsigned period_us, int pulseWidth_us, bool timerEnable):
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Adafruit_ZeroTimer(timerNr), pin(pin), countersize(countersize), period_us(period_us)
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{ if(pulseWidth_us==-1) calc(period_us, period_us/2);
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else calc(period_us, pulseWidth_us);
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init(timerEnable);
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}
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SAMDtimer::SAMDtimer(byte timerNr, tc_callback_t _ISR, unsigned period_us, bool ISRenable):
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Adafruit_ZeroTimer(timerNr)
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{ ISR = _ISR;
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countersize = TC_COUNTER_SIZE_16BIT;
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calc(period_us, period_us/2);
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init(1);
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setCallback(ISRenable, TC_CALLBACK_CC_CHANNEL1, ISR);
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}
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void SAMDtimer::setPulseWidth(unsigned pulseWidth_us)
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{ calc(period_us, pulseWidth_us);
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setPeriodMatch(periodCounter, PWcounter, 1);
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}
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void SAMDtimer::attachInterrupt(tc_callback_t _ISR, bool interruptEnable)
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{ ISR = _ISR;
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setCallback(interruptEnable, TC_CALLBACK_CC_CHANNEL1, ISR);
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}
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void SAMDtimer::enableTimer(bool timerEnable)
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{ enable(timerEnable);
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}
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void SAMDtimer::enableInterrupt(bool interruptEnable)
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{ setCallback(interruptEnable, TC_CALLBACK_CC_CHANNEL1, ISR);
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}
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void SAMDtimer::init(bool enabled)
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{ configure(prescale, countersize, TC_WAVE_GENERATION_MATCH_PWM);
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PWMout(true, 1, pin); // must be ch1 for 16bit
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setPeriodMatch(periodCounter, PWcounter, 1);
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enable(enabled);
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}
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void SAMDtimer::calc(unsigned period_us, unsigned pulseWidth_us)
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{ periodCounter = (F_CPU * (signed)period_us) / 1000000; // why signed?
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PWcounter = (F_CPU * (signed)pulseWidth_us) / 1000000;
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if(periodCounter < 65536) prescale = TC_CLOCK_PRESCALER_DIV1;
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else if((PWcounter >>= 1, periodCounter >>= 1) < 65536) prescale = TC_CLOCK_PRESCALER_DIV2; // = 256
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else if((PWcounter >>= 1, periodCounter >>= 1) < 65536) prescale = TC_CLOCK_PRESCALER_DIV4;
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else if((PWcounter >>= 1, periodCounter >>= 1) < 65536) prescale = TC_CLOCK_PRESCALER_DIV8;
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else if((PWcounter >>= 1, periodCounter >>= 1) < 65536) prescale = TC_CLOCK_PRESCALER_DIV16;
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else if((PWcounter >>= 2, periodCounter >>= 2) < 65536) prescale = TC_CLOCK_PRESCALER_DIV64;
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else if((PWcounter >>= 2, periodCounter >>= 2) < 65536) prescale = TC_CLOCK_PRESCALER_DIV256;
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else if((PWcounter >>= 2, periodCounter >>= 2) < 65536) prescale = TC_CLOCK_PRESCALER_DIV1024;
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}
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‎avdweb_SAMDtimer.h‎

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/*
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Copyright (C) 2012 Albert van Dalen http://www.avdweb.nl
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This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License at http://www.gnu.org/licenses .
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Version 26-1-2017
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*/
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#ifndef SAMDtimer_H
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#define SAMDtimer_H
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#include <Adafruit_ZeroTimer.h>
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class SAMDtimer : public Adafruit_ZeroTimer
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{ public:
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SAMDtimer(byte timerNr, tc_counter_size countersize, byte pin, unsigned period_us, int pulseWidth_us=-1, bool timerEnable=1); // For timer with output
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SAMDtimer(byte timerNr, tc_callback_t _ISR, unsigned period_us, bool ISRenable=1); // For timer interrupt, without output
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void attachInterrupt(tc_callback_t _ISR, bool interruptEnable=1); // attach ISR to a timer with output, or exchange the ISR
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void enableTimer(bool timerEnable);
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void enableInterrupt(bool interruptEnable);
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void setPulseWidth(unsigned pulseWidth_us);
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protected:
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void init(bool enabled);
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void calc(unsigned period_us, unsigned pulseWidth_us);
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byte pin;
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tc_callback_t ISR;
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unsigned period_us, periodCounter, PWcounter;
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tc_clock_prescaler prescale;
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tc_counter_size countersize;
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};
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#endif

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