hello all,
i have a c function from some modbus documentation that i need to
translate into python.
it looks like this:
unsigned short CRC16(puchMsg, usDataLen)
unsigned char *puchMsg ;
unsigned short usDataLen ;
{
unsigned char uchCRCHi = 0xFF ;
unsigned char uchCRCLo = 0xFF ;
unsigned uIndex ;
while (usDataLen--)
{
uIndex = uchCRCHi ^ *puchMsgg++ ;
uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex} ;
uchCRCLo = auchCRCLo[uIndex] ;
}
return (uchCRCHi << 8 | uchCRCLo) ;
}
some of it i can make out, but i can't seem to figgure out
this part ' auchCRCHi[uIndex};
it looks like a typo, because there is a closing } that does not match
the opening [.
here is what i have so far, but is not giving me the right values
def crc16(data):
crc_hi = 0xff
crc_lo = 0xff
for x in data:
crc_index = crc_hi ^ x
crc_hi = crc_lo ^ (crc_hi | crc_index)
crc_lo = crc_lo | crc_index
return (crc_hi << 8 | crc_lo)
whaddya think?
thanks
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