mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/*
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* © 2021, Harald Barth.
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*
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* This file is part of DCC-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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#pragma once
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#include <Arduino.h>
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#if defined(ARDUINO_ARCH_ESP32)
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#include "DCCPacket.h"
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#include "driver/rmt.h"
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#include "soc/rmt_reg.h"
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#include "soc/rmt_struct.h"
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// make calculations easy and set up for microseconds
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#define RMT_CLOCK_DIVIDER 80
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#define DCC_1_HALFPERIOD 58 //4640 // 1 / 80000000 * 4640 = 58us
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#define DCC_0_HALFPERIOD 100 //8000
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class RMTChannel {
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public:
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RMTChannel(byte pin, byte ch, byte plen);
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void IRAM_ATTR RMTinterrupt();
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void RMTprefill();
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bool RMTfillData(dccPacket packet);
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//bool RMTfillData(const byte buffer[], byte byteCount, byte repeatCount);
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static RMTChannel mainRMTChannel;
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static RMTChannel progRMTChannel;
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private:
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rmt_channel_t channel;
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// 3 types of data to send, preamble and then idle or data
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// if this is prog track, idle will contain reset instead
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rmt_item32_t *idle;
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byte idleLen;
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rmt_item32_t *preamble;
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byte preambleLen;
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rmt_item32_t *data;
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byte dataLen;
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byte maxDataLen;
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// flags
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volatile bool preambleNext = true; // alternate between preamble and content
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volatile bool dataReady = false; // do we have real data available or send idle
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volatile byte dataRepeat = 0;
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};
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#endif //ESP32
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