mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
/*
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* © 2020-2022 Harald Barth
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*
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* This file is part of CommandStation-EX
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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 an ESP8266 and ESP32
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// On ESP32 we do not even use the functions but they are here for completeness sake
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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_ESP8266
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#include "DCCTimer.h"
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INTERRUPT_CALLBACK interruptHandler=0;
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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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// Fake this as it should not be used
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void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
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mac[0] = 0xFE;
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mac[1] = 0xBE;
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mac[2] = 0xEF;
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mac[3] = 0xC0;
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mac[4] = 0xFF;
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mac[5] = 0xEE;
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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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int DCCTimer::freeMemory() {
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return ESP.getFreeHeap();
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}
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#endif
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////////////////////////////////////////////////////////////////////////
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#ifdef ARDUINO_ARCH_ESP32
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#include "DCCTimer.h"
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INTERRUPT_CALLBACK interruptHandler=0;
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// https://www.visualmicro.com/page/Timer-Interrupts-Explained.aspx
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portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
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void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
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interruptHandler = callback;
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hw_timer_t *timer = NULL;
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timer = timerBegin(0, 2, true); // prescaler can be 2 to 65536 so choose 2
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timerAttachInterrupt(timer, interruptHandler, true);
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timerAlarmWrite(timer, CLOCK_CYCLES / 6, true); // divide by prescaler*3 (Clockbase is 80Mhz and not F_CPU 240Mhz)
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timerAlarmEnable(timer);
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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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// Fake this as it should not be used
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void DCCTimer::getSimulatedMacAddress(byte mac[6]) {
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mac[0] = 0xFE;
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mac[1] = 0xBE;
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mac[2] = 0xEF;
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mac[3] = 0xC0;
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mac[4] = 0xFF;
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mac[5] = 0xEE;
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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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int DCCTimer::freeMemory() {
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return ESP.getFreeHeap();
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}
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#endif
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