mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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64 lines
2.7 KiB
C++
64 lines
2.7 KiB
C++
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/*
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* © 2021, Neil McKechnie. All rights reserved.
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*
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* This file is part of DCC++EX 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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#include "DCC.h"
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#include "IODevice.h"
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#include "DIAG.h"
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// Note: For DCC Accessory Decoders, a particular output can be specified by
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// a linear address, or by an address/subaddress pair, where the subaddress is
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// in the range 0 to 3 and specifies an output within a group of 4.
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// NMRA and DCC++EX accepts addresses in the range 0-511. Linear addresses
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// are not specified by the NMRA and so different manufacturers may calculate them
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// in different ways. DCC+EX uses a range of 1-2044 which excludes decoder address 0.
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// Therefore, I've avoided using linear addresses here because of the ambiguities
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// involved. Instead I've used the term 'packedAddress'.
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void DCCAccessoryDecoder::create(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
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new DCCAccessoryDecoder(vpin, nPins, DCCAddress, DCCSubaddress);
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}
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// Constructor
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DCCAccessoryDecoder::DCCAccessoryDecoder(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
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_firstVpin = vpin;
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_nPins = nPins;
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_packedAddress = (DCCAddress << 2) + DCCSubaddress;
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int endAddress = _packedAddress + _nPins - 1;
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DIAG(F("DCC Accessory Decoder configured Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
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_packedAddress, _packedAddress+_nPins-1,
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DCCAddress, DCCSubaddress, endAddress >> 2, endAddress % 4);
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}
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// Device-specific write function.
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void DCCAccessoryDecoder::_write(VPIN id, int state) {
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int packedAddress = _packedAddress + id - _firstVpin;
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#ifdef DIAG_IO
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DIAG(F("DCC Write Linear Address:%d State:%d"), packedAddress, state);
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#endif
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DCC::setAccessory(packedAddress >> 2, packedAddress % 4, state);
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}
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void DCCAccessoryDecoder::_display() {
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int endAddress = _packedAddress + _nPins - 1;
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DIAG(F("DCC Accessory Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
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_packedAddress, _packedAddress+_nPins-1,
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_packedAddress >> 2, _packedAddress % 4, endAddress >> 2, endAddress % 4);
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}
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