Hello, I am trying to xor the byte representation of every char in a string with its predecessor. But I don't know how to convert a char into its byte representation. This is to calculate the nmea checksum for gps data.
e.g. everything between $ and * needs to be xor:
$GPGSV,3,1,10,06,79,187,39,30,59,098,40,25,51,287,00,05,25,103,44*
to get the checksum.
Thank you for you help.
Phil
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