mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-26 17:46:14 +01:00
124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
/*
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* © 2021 Mike S
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* © 2021 Harald Barth
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* © 2021 Fred Decker
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* © 2021 Chris Harlow
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* © 2021 David Cutting
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* All rights reserved.
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*
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* This file is part of Asbelos DCC API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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// ATTENTION: this file only compiles on a UNO or MEGA
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// Please refer to DCCTimer.h for general comments about how this class works
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// This is to avoid repetition and duplication.
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#ifdef ARDUINO_ARCH_AVR
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#include <avr/boot.h>
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#include <avr/wdt.h>
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#include "DCCTimer.h"
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INTERRUPT_CALLBACK interruptHandler=0;
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// Arduino nano, uno, mega etc
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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#define TIMER1_A_PIN 11
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#define TIMER1_B_PIN 12
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#define TIMER1_C_PIN 13
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#else
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#define TIMER1_A_PIN 9
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#define TIMER1_B_PIN 10
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#endif
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void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
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interruptHandler=callback;
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noInterrupts();
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ADCSRA = (ADCSRA & 0b11111000) | 0b00000100; // speed up analogRead sample time
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TCCR1A = 0;
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ICR1 = CLOCK_CYCLES;
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TCNT1 = 0;
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TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1
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TIMSK1 = _BV(TOIE1); // Enable Software interrupt
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interrupts();
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}
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// ISR called by timer interrupt every 58uS
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ISR(TIMER1_OVF_vect){ interruptHandler(); }
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// Alternative pin manipulation via PWM control.
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bool DCCTimer::isPWMPin(byte pin) {
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return pin==TIMER1_A_PIN
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|| pin==TIMER1_B_PIN
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#ifdef TIMER1_C_PIN
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|| pin==TIMER1_C_PIN
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#endif
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;
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}
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void DCCTimer::setPWM(byte pin, bool high) {
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if (pin==TIMER1_A_PIN) {
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TCCR1A |= _BV(COM1A1);
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OCR1A= high?1024:0;
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}
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else if (pin==TIMER1_B_PIN) {
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TCCR1A |= _BV(COM1B1);
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OCR1B= high?1024:0;
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}
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#ifdef TIMER1_C_PIN
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else if (pin==TIMER1_C_PIN) {
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TCCR1A |= _BV(COM1C1);
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OCR1C= high?1024:0;
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}
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#endif
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}
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void DCCTimer::clearPWM() {
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TCCR1A= 0;
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}
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void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
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for (byte i=0; i<6; i++) {
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mac[i]=boot_signature_byte_get(0x0E + i);
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}
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mac[0] &= 0xFE;
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mac[0] |= 0x02;
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}
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volatile int DCCTimer::minimum_free_memory=__INT_MAX__;
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// Return low memory value...
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int DCCTimer::getMinimumFreeMemory() {
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noInterrupts(); // Disable interrupts to get volatile value
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int retval = minimum_free_memory;
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interrupts();
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return retval;
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}
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extern char *__brkval;
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extern char *__malloc_heap_start;
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int DCCTimer::freeMemory() {
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char top;
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return __brkval ? &top - __brkval : &top - __malloc_heap_start;
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}
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void DCCTimer::reset() {
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wdt_enable( WDTO_15MS); // set Arduino watchdog timer for 15ms
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delay(50); // wait for the prescaller time to expire
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}
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#endif
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