mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-24 00:26:13 +01:00
118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
/*
|
|
* © 2021 Mike S
|
|
* © 2021 Harald Barth
|
|
* © 2021 Fred Decker
|
|
* © 2021 Chris Harlow
|
|
* © 2021 David Cutting
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of Asbelos DCC API
|
|
*
|
|
* This is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* It is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
// ATTENTION: this file only compiles on a UNO or MEGA
|
|
// Please refer to DCCTimer.h for general comments about how this class works
|
|
// This is to avoid repetition and duplication.
|
|
#ifdef ARDUINO_ARCH_AVR
|
|
|
|
#include <avr/boot.h>
|
|
#include "DCCTimer.h"
|
|
INTERRUPT_CALLBACK interruptHandler=0;
|
|
|
|
// Arduino nano, uno, mega etc
|
|
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
|
|
#define TIMER1_A_PIN 11
|
|
#define TIMER1_B_PIN 12
|
|
#define TIMER1_C_PIN 13
|
|
#else
|
|
#define TIMER1_A_PIN 9
|
|
#define TIMER1_B_PIN 10
|
|
#endif
|
|
|
|
void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
|
|
interruptHandler=callback;
|
|
noInterrupts();
|
|
ADCSRA = (ADCSRA & 0b11111000) | 0b00000100; // speed up analogRead sample time
|
|
TCCR1A = 0;
|
|
ICR1 = CLOCK_CYCLES;
|
|
TCNT1 = 0;
|
|
TCCR1B = _BV(WGM13) | _BV(CS10); // Mode 8, clock select 1
|
|
TIMSK1 = _BV(TOIE1); // Enable Software interrupt
|
|
interrupts();
|
|
}
|
|
|
|
// ISR called by timer interrupt every 58uS
|
|
ISR(TIMER1_OVF_vect){ interruptHandler(); }
|
|
|
|
// Alternative pin manipulation via PWM control.
|
|
bool DCCTimer::isPWMPin(byte pin) {
|
|
return pin==TIMER1_A_PIN
|
|
|| pin==TIMER1_B_PIN
|
|
#ifdef TIMER1_C_PIN
|
|
|| pin==TIMER1_C_PIN
|
|
#endif
|
|
;
|
|
}
|
|
|
|
void DCCTimer::setPWM(byte pin, bool high) {
|
|
if (pin==TIMER1_A_PIN) {
|
|
TCCR1A |= _BV(COM1A1);
|
|
OCR1A= high?1024:0;
|
|
}
|
|
else if (pin==TIMER1_B_PIN) {
|
|
TCCR1A |= _BV(COM1B1);
|
|
OCR1B= high?1024:0;
|
|
}
|
|
#ifdef TIMER1_C_PIN
|
|
else if (pin==TIMER1_C_PIN) {
|
|
TCCR1A |= _BV(COM1C1);
|
|
OCR1C= high?1024:0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void DCCTimer::clearPWM() {
|
|
TCCR1A= 0;
|
|
}
|
|
|
|
void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
|
|
for (byte i=0; i<6; i++) {
|
|
mac[i]=boot_signature_byte_get(0x0E + i);
|
|
}
|
|
mac[0] &= 0xFE;
|
|
mac[0] |= 0x02;
|
|
}
|
|
|
|
|
|
volatile int DCCTimer::minimum_free_memory=__INT_MAX__;
|
|
|
|
// Return low memory value...
|
|
int DCCTimer::getMinimumFreeMemory() {
|
|
noInterrupts(); // Disable interrupts to get volatile value
|
|
int retval = minimum_free_memory;
|
|
interrupts();
|
|
return retval;
|
|
}
|
|
|
|
extern char *__brkval;
|
|
extern char *__malloc_heap_start;
|
|
|
|
int DCCTimer::freeMemory() {
|
|
char top;
|
|
return __brkval ? &top - __brkval : &top - __malloc_heap_start;
|
|
}
|
|
|
|
#endif
|