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DCCAccessoryDecoder class tidy. RCN-213 option.

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Rationalise address calculation into three macros.  Ensure device is added to device chain.
Allow inversion of the DCC packet to match definition of packet D bit in RCN-213, D=0 for 'throw' (rather than the DCC++ usage of D=1 for 'throw').
This commit is contained in:
Neil McKechnie 2021-08-27 21:47:13 +01:00
parent fb6ab85c4a
commit 7dea284ba8
1 changed files with 16 additions and 8 deletions
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24
IO_DCCAccessory.cpp
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@ -20,25 +20,30 @@
#include "DCC.h"
#include "IODevice.h"
#include "DIAG.h"
#include "defines.h"
// Note: For DCC Accessory Decoders, a particular output can be specified by
// a linear address, or by an address/subaddress pair, where the subaddress is
// in the range 0 to 3 and specifies an output within a group of 4.
// NMRA and DCC++EX accepts addresses in the range 0-511. Linear addresses
// are not specified by the NMRA and so different manufacturers may calculate them
// in different ways. DCC+EX uses a range of 1-2044 which excludes decoder address 0.
// Therefore, I've avoided using linear addresses here because of the ambiguities
// involved. Instead I've used the term 'packedAddress'.
// in different ways. DCC++EX uses a range of 1-2044 which excludes decoder address 0.
// Linear address 1 corresponds to address 1 subaddress 0.
#define LINEARADDRESS(addr, subaddr) (((addr-1) << 2) + subaddr + 1)
#define ADDRESS(linearaddr) (((linearaddr-1) >> 2) + 1)
#define SUBADDRESS(linearaddr) ((linearaddr-1) % 4)
void DCCAccessoryDecoder::create(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
new DCCAccessoryDecoder(vpin, nPins, DCCAddress, DCCSubaddress);
}
// Constructor
// Constructors
DCCAccessoryDecoder::DCCAccessoryDecoder(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
_firstVpin = vpin;
_nPins = nPins;
_packedAddress = (DCCAddress << 2) + DCCSubaddress;
_packedAddress = LINEARADDRESS(DCCAddress, DCCSubaddress);
addDevice(this);
}
void DCCAccessoryDecoder::_begin() {
@ -47,19 +52,22 @@ void DCCAccessoryDecoder::_begin() {
#endif
}
// Device-specific write function.
// Device-specific write function. State 1=closed, 0=thrown. Adjust for RCN-213 compliance
void DCCAccessoryDecoder::_write(VPIN id, int state) {
int packedAddress = _packedAddress + id - _firstVpin;
#ifdef DIAG_IO
DIAG(F("DCC Write Linear Address:%d State:%d"), packedAddress, state);
#endif
DCC::setAccessory(packedAddress >> 2, packedAddress % 4, state);
#if !defined(DCC_ACCESSORY_RCN_213)
state = !state;
#endif
DCC::setAccessory(ADDRESS(packedAddress), SUBADDRESS(packedAddress), state);
}
void DCCAccessoryDecoder::_display() {
int endAddress = _packedAddress + _nPins - 1;
DIAG(F("DCCAccessoryDecoder Configured on Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
_packedAddress, _packedAddress+_nPins-1,
_packedAddress >> 2, _packedAddress % 4, endAddress >> 2, endAddress % 4);
ADDRESS(_packedAddress), SUBADDRESS(_packedAddress), ADDRESS(endAddress), SUBADDRESS(endAddress));
}