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Rework the LICH parity.

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This commit is contained in:
Jonathan Naylor 2018-03-20 19:19:18 +00:00
parent f11ed22000
commit 5a22b3d0a6
3 changed files with 46 additions and 20 deletions
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30
NXDNCRC.cpp
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@ -133,6 +133,25 @@ void CNXDNCRC::encodeCRC15(unsigned char* in, unsigned int length)
}
}
bool CNXDNCRC::checkLICHParity(unsigned char in)
{
bool newParity = createLICHParity(in);
bool oldParity = (in & 0x01U) == 0x01U;
return newParity == oldParity;
}
void CNXDNCRC::encodeLICHParity(unsigned char& in)
{
bool parity = createLICHParity(in);
if (parity)
in |= 0x01U;
else
in &= 0xFEU;
}
uint8_t CNXDNCRC::createCRC6(const unsigned char* in, unsigned int length)
{
uint8_t crc = 0x3FU;
@ -183,3 +202,14 @@ uint16_t CNXDNCRC::createCRC15(const unsigned char* in, unsigned int length)
return crc & 0x7FFFU;
}
bool CNXDNCRC::createLICHParity(unsigned char in)
{
switch (in & 0xF0U) {
case 0x80U:
case 0xB0U:
return true;
default:
return false;
}
}