All,

  I have wasted way too much time so I am hoping that someone on the
list can help me.

  I have an application that utilizes the serial port for sending and
receiving either very short (4 byte) packets or long (1000 byte)
packets.  I have been requested to implement CRC to the data packets.
The problem I am having is that every CRC program I have been able to
find provides a different answer for the same conditions.  One site
claims that their implementation is correct and another states that
theirs is correct.  Since the CRC will either be checked or generated by
a separate program on the PC I need to be reasonably sure that what I
have implemented is correct and repeatable.

  A 2 byte overhead for a 4 byte packet seems excessive so I thought of
using CRC8.  But will CRC8 be sufficient for a 1000 byte packet?

  Can anyone point me to (or provide me with) some source code that
implements the CRC generation/checking (either table driven or
algorithm) in "C" please since I have been asked to limit my use of
assembly since it makes it more difficult for them to maintain in the
future.  For what ever difference it makes, I am working with the PIC24.

  Thanks,
Phil

-- 
--------------------------------
Long ago when men cursed and beat the
ground with sticks,  it was called witchcraft..

Today, it's called golf.



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