55 lines
2 KiB
C++
55 lines
2 KiB
C++
/**
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* Copyright (c) 2011-2020 Bill Greiman
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* This file is part of the SdFat library for SD memory cards.
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*
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* MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "SysCall.h"
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#if 0 // defined(__AVR_ATmega328P__) && !ENABLE_ARDUINO_FEATURES
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#include <avr/interrupt.h>
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// ISR for timer 2 Compare A interrupt
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volatile uint16_t timer2 = 0;
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ISR(TIMER2_COMPA_vect) {
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timer2++;
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}
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SdMillis_t SysCall::curTimeMS() {
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if (TIMSK2 != (1 << OCIE2A)) {
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// use system clock (clkI/O).
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ASSR &= ~(1 << AS2);
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// Clear Timer on Compare Match (CTC) mode
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TCCR2A = (1 << WGM21);
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// Only need 64x prescale bits in TCCR2B
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TCCR2B = (1 << CS22);
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// set TOP so timer period is 1 ms.
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#if F_CPU/64000 > 250
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#error F_CPU too large.
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#endif // F_CPU/64000 > 250
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OCR2A = F_CPU/64000UL - 1;
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// Enable interrupt.
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TIMSK2 = (1 << OCIE2A);
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}
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cli();
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uint16_t rtn = timer2;
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sei();
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return rtn;
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}
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#endif // defined(__AVR_ATmega328P__) && !ENABLE_ARDUINO_FEATURES
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