Port Function crc_ccitt_update from C++

[Py Thorneiro]

Hi folks,

    Please, I don´t understand exactly what this function CRC CCITT UPDATE
in C++ AVR can be ported to Python..

uint16_t
crc_ccitt_update (uint16_t crc, uint8_t data)
{
   data ˆ= lo8 (crc);
   data ˆ= data << 4;
   return ((((uint16_t)data << 8) | hi8 (crc)) ˆ (uint8_t)(data >> 4)
ˆ ((uint16_t)data << 3));
}

Source:
http://tldp.tuxhilfe.de/linuxfocus/common/src2/article352/avr-libc-user-manual-1.0.4.pdf

      In parts reason this lo8 and hi8, is there some good soul here that
can help-me with this conversion?

     I try seach in Google and Koders some code that use it, but I don´t had
sucess...


Big Hugs
Thanks
Regards.


-Py -Thorneiro
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