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Update IO_DCCAccessory.cpp

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Ensure the full range of addresses including 0 are handled.
This commit is contained in:
Neil McKechnie 2021-09-22 14:12:23 +01:00
parent 32eb8fe8c7
commit e11fd18849
1 changed files with 5 additions and 14 deletions
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19
IO_DCCAccessory.cpp
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@ -22,17 +22,9 @@
#include "DIAG.h" #include "DIAG.h"
#include "defines.h" #include "defines.h"
// Note: For DCC Accessory Decoders, a particular output can be specified by #define PACKEDADDRESS(addr, subaddr) (((addr) << 2) + (subaddr))
// a linear address, or by an address/subaddress pair, where the subaddress is #define ADDRESS(packedaddr) ((packedaddr) >> 2)
// in the range 0 to 3 and specifies an output within a group of 4. #define SUBADDRESS(packedaddr) ((packedaddr) % 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.
// 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) { void DCCAccessoryDecoder::create(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
new DCCAccessoryDecoder(vpin, nPins, DCCAddress, DCCSubaddress); new DCCAccessoryDecoder(vpin, nPins, DCCAddress, DCCSubaddress);
@ -42,7 +34,7 @@ void DCCAccessoryDecoder::create(VPIN vpin, int nPins, int DCCAddress, int DCCSu
DCCAccessoryDecoder::DCCAccessoryDecoder(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) { DCCAccessoryDecoder::DCCAccessoryDecoder(VPIN vpin, int nPins, int DCCAddress, int DCCSubaddress) {
_firstVpin = vpin; _firstVpin = vpin;
_nPins = nPins; _nPins = nPins;
_packedAddress = LINEARADDRESS(DCCAddress, DCCSubaddress); _packedAddress = PACKEDADDRESS(DCCAddress, DCCSubaddress);
addDevice(this); addDevice(this);
} }
@ -66,8 +58,7 @@ void DCCAccessoryDecoder::_write(VPIN id, int state) {
void DCCAccessoryDecoder::_display() { void DCCAccessoryDecoder::_display() {
int endAddress = _packedAddress + _nPins - 1; 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, DIAG(F("DCCAccessoryDecoder Configured on Vpins:%d-%d Addresses %d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
_packedAddress, _packedAddress+_nPins-1,
ADDRESS(_packedAddress), SUBADDRESS(_packedAddress), ADDRESS(endAddress), SUBADDRESS(endAddress)); ADDRESS(_packedAddress), SUBADDRESS(_packedAddress), ADDRESS(endAddress), SUBADDRESS(endAddress));
} }