mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-27 01:56:14 +01:00
244 lines
7.3 KiB
C++
244 lines
7.3 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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/* This timer class is used to manage the single timer required to handle the DCC waveform.
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* All timer access comes through this class so that it can be compiled for
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* various hardware CPU types.
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*
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* DCCEX works on a single timer interrupt at a regular 58uS interval.
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* The DCCWaveform class generates the signals to the motor shield
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* based on this timer.
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*
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* If the motor drivers are BOTH configured to use the correct 2 pins for the architecture,
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* (see isPWMPin() function. )
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* then this allows us to use a hardware driven pin switching arrangement which is
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* achieved by setting the duty cycle of the NEXT clock interrupt to 0% or 100% depending on
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* the required pin state. (see setPWM())
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* This is more accurate than the software interrupt but at the expense of
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* limiting the choice of available pins.
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* Fortunately, a standard motor shield on a Mega uses pins that qualify for PWM...
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* Other shields may be jumpered to PWM pins or run directly using the software interrupt.
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*
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* Because the PWM-based waveform is effectively set half a cycle after the software version,
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* it is not acceptable to drive the two tracks on different methiods or it would cause
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* problems for <1 JOIN> etc.
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*
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*/
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#include "DCCTimer.h"
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const int DCC_SIGNAL_TIME=58; // this is the 58uS DCC 1-bit waveform half-cycle
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const long CLOCK_CYCLES=(F_CPU / 1000000 * DCC_SIGNAL_TIME);
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INTERRUPT_CALLBACK interruptHandler=0;
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#ifdef ARDUINO_ARCH_MEGAAVR
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// Arduino unoWifi Rev2 and nanoEvery architectire
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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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ADC0.CTRLC = (ADC0.CTRLC & 0b00110000) | 0b01000011; // speed up analogRead sample time
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TCB0.CTRLB = TCB_CNTMODE_INT_gc & ~TCB_CCMPEN_bm; // timer compare mode with output disabled
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TCB0.CTRLA = TCB_CLKSEL_CLKDIV2_gc; // 8 MHz ~ 0.125 us
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TCB0.CCMP = (CLOCK_CYCLES>>1) -1; // 1 tick less for timer reset
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TCB0.INTFLAGS = TCB_CAPT_bm; // clear interrupt request flag
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TCB0.INTCTRL = TCB_CAPT_bm; // Enable the interrupt
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TCB0.CNT = 0;
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TCB0.CTRLA |= TCB_ENABLE_bm; // start
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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(TCB0_INT_vect){
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TCB0.INTFLAGS = TCB_CAPT_bm;
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interruptHandler();
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}
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bool DCCTimer::isPWMPin(byte pin) {
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(void) pin;
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return false; // TODO what are the relevant pins?
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}
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void DCCTimer::setPWM(byte pin, bool high) {
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(void) pin;
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(void) high;
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// TODO what are the relevant pins?
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}
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void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
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memcpy(mac,(void *) &SIGROW.SERNUM0,6); // serial number
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mac[0] &= 0xFE;
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mac[0] |= 0x02;
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}
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#elif defined(TEENSYDUINO)
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IntervalTimer myDCCTimer;
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void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
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interruptHandler=callback;
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myDCCTimer.begin(interruptHandler, DCC_SIGNAL_TIME);
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}
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bool DCCTimer::isPWMPin(byte pin) {
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//Teensy: digitalPinHasPWM, todo
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(void) pin;
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return false; // TODO what are the relevant pins?
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}
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void DCCTimer::setPWM(byte pin, bool high) {
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// TODO what are the relevant pins?
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(void) pin;
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(void) high;
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}
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void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
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#if defined(__IMXRT1062__) //Teensy 4.0 and Teensy 4.1
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uint32_t m1 = HW_OCOTP_MAC1;
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uint32_t m2 = HW_OCOTP_MAC0;
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mac[0] = m1 >> 8;
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mac[1] = m1 >> 0;
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mac[2] = m2 >> 24;
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mac[3] = m2 >> 16;
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mac[4] = m2 >> 8;
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mac[5] = m2 >> 0;
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#else
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read_mac(mac);
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#endif
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}
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#if !defined(__IMXRT1062__)
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void DCCTimer::read_mac(byte mac[6]) {
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read(0xe,mac,0);
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read(0xf,mac,3);
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}
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// http://forum.pjrc.com/threads/91-teensy-3-MAC-address
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void DCCTimer::read(uint8_t word, uint8_t *mac, uint8_t offset) {
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FTFL_FCCOB0 = 0x41; // Selects the READONCE command
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FTFL_FCCOB1 = word; // read the given word of read once area
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// launch command and wait until complete
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FTFL_FSTAT = FTFL_FSTAT_CCIF;
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while(!(FTFL_FSTAT & FTFL_FSTAT_CCIF));
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*(mac+offset) = FTFL_FCCOB5; // collect only the top three bytes,
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*(mac+offset+1) = FTFL_FCCOB6; // in the right orientation (big endian).
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*(mac+offset+2) = FTFL_FCCOB7; // Skip FTFL_FCCOB4 as it's always 0.
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}
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#endif
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#elif defined(ARDUINO_ARCH_ESP8266)
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void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
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interruptHandler=callback;
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timer1_disable();
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// There seem to be differnt ways to attach interrupt handler
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// ETS_FRC_TIMER1_INTR_ATTACH(NULL, NULL);
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// ETS_FRC_TIMER1_NMI_INTR_ATTACH(interruptHandler);
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// Let us choose the one from the API
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timer1_attachInterrupt(interruptHandler);
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// not exactly sure of order:
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timer1_enable(TIM_DIV1, TIM_EDGE, TIM_LOOP);
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timer1_write(CLOCK_CYCLES);
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}
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// We do not support to use PWM to make the Waveform on ESP
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bool IRAM_ATTR DCCTimer::isPWMPin(byte pin) {
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return false;
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}
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void IRAM_ATTR DCCTimer::setPWM(byte pin, bool high) {
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}
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#else
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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>>1;
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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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#include <avr/boot.h>
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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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#endif
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