dcc/Defs.cxx

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#include "dcc/Defs.hxx"
 
namespace dcc
{
namespace Defs
{
 
bool decode_address_partition(uint16_t addr14, uint16_t *addr,
    uint8_t *partition, dcc::TrainAddressType *atype)
{
    TrainAddressType _atype = TrainAddressType::UNSUPPORTED;
    uint8_t _partition = 0xff;
    uint16_t _addr = 0xffffu;
 
    addr14 &= (1u << 14) - 1;
    uint8_t hibyte = addr14 >> 8;
    if (hibyte <= MAX_MOBILE_LONG)
    {
        _atype = TrainAddressType::DCC_LONG_ADDRESS;
        _partition = 0;
        _addr = addr14;
    }
    else if ((hibyte & MASK_ACC_EXT) == ADR_ACC_EXT)
    {
        _atype = TrainAddressType::DCC_ACCY_EXT;
        _partition = ADR_ACC_EXT;
        _addr = addr14 & ~(MASK_ACC_EXT << 8);
    }
    else if ((hibyte & MASK_ACC_BASIC) == ADR_ACC_BASIC)
    {
        _atype = TrainAddressType::DCC_ACCY_BASIC_OUTPUT;
        _partition = ADR_ACC_BASIC;
        _addr = addr14 & ~(MASK_ACC_BASIC << 8);
    }
    else if (hibyte == ADR_MOBILE_SHORT)
    {
        _atype = TrainAddressType::DCC_SHORT_ADDRESS;
        _partition = hibyte;
        _addr = addr14 & 0x7f;
    }
    else
    {
        return false;
    }
 
    if (addr)
    {
        *addr = _addr;
    }
    if (partition)
    {
        *partition = _partition;
    }
    if (atype)
    {
        *atype = _atype;
    }
    return true;
}
 
} // namespace dcc::Defs
 
} // namespace dcc