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DCCRMT.h
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DCCRMT.h
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/*
* © 2021-2022, Harald Barth.
*
* This file is part of DCC-EX
*
* 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/>.
*/
#if defined(ARDUINO_ARCH_ESP32)
#pragma once
#include <Arduino.h>
#include "driver/rmt.h"
#include "soc/rmt_reg.h"
#include "soc/rmt_struct.h"
#include "MotorDriver.h" // for class pinpair
// make calculations easy and set up for microseconds
#define RMT_CLOCK_DIVIDER 80
#define DCC_1_HALFPERIOD 58 //4640 // 1 / 80000000 * 4640 = 58us
#define DCC_0_HALFPERIOD 100 //8000
class RMTChannel {
public:
RMTChannel(pinpair pins, bool isMain);
bool addPin(byte pin, bool inverted=0);
bool addPin(pinpair pins);
void IRAM_ATTR RMTinterrupt();
void RMTprefill();
//int RMTfillData(dccPacket packet);
int RMTfillData(const byte buffer[], byte byteCount, byte repeatCount);
inline bool busy() {
if (dataRepeat > 0) // we have still old work to do
return true;
return dataReady;
};
inline uint32_t packetCount() { return packetCounter; };
private:
rmt_channel_t channel;
// 3 types of data to send, preamble and then idle or data
// if this is prog track, idle will contain reset instead
rmt_item32_t *idle;
byte idleLen;
rmt_item32_t *preamble;
byte preambleLen;
rmt_item32_t *data;
byte dataLen;
byte maxDataLen;
uint32_t packetCounter = 0;
// flags
volatile bool dataReady = false; // do we have real data available or send idle
volatile byte dataRepeat = 0;
};
#endif //ESP32