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???
02/08/07 19:15
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 		 #132318 - a variant..
Responding to: ???'s previous message
Charles Bannister said:

chksum = ASC(MID$(NEMA$, 2, 1))
PRINT " 1. Hex Checksum value " + HEX$(chksum), "ASCII (HEX) NEMA DATA " + (MID$(NEMA$, 2, 1)), HEX$(ASC(MID$(NEMA$, 2, 1)))

FOR x = 3 TO LEN(NEMA$) - 3
chksum = ASC(MID$(NEMA$, x, 1)) XOR chksum
PRINT STR$(x) + ". Hex Checksum value " + HEX$(chksum), "ASCII (HEX) NEMA DATA " + (MID$(NEMA$, x, 1)), HEX$(ASC(MID$(NEMA$, x, 1)))
NEXT x




I probably would have written:

chksum = 0
FOR x = 2 TO LEN(NEMA$) - 3
chksum = ASC(MID$(NEMA$, x, 1)) XOR chksum
.....

makes it a bit more "generic"

rgds


List of 64 messages in thread
TopicAuthorDate
C or Basic Programming Language            01/01/70 00:00      
   well neither one is better......            01/01/70 00:00      
      BASIC            01/01/70 00:00      
         Beginner's All-Purpose Instruction(al) Code            01/01/70 00:00      
            Oops            01/01/70 00:00      
         Beginners All-purpose Symbolic Instruction Code            01/01/70 00:00      
         BASIC over C, but only just...            01/01/70 00:00      
            BASIC - the competition?            01/01/70 00:00      
               You may be right and you may also be wrong            01/01/70 00:00      
                  Anachronism?            01/01/70 00:00      
                     Possible but unintended :-)            01/01/70 00:00      
         I tend to recall having heard            01/01/70 00:00      
            Yeh, That sounds like...            01/01/70 00:00      
               Wikipedia knows everything            01/01/70 00:00      
   C or others            01/01/70 00:00      
      Not true            01/01/70 00:00      
   both, or none            01/01/70 00:00      
   There are only 3 reasons to choose 'C'            01/01/70 00:00      
      Top reason            01/01/70 00:00      
         is that support, too?            01/01/70 00:00      
            or            01/01/70 00:00      
   What is BASIC?            01/01/70 00:00      
      is this why you choose a languge?            01/01/70 00:00      
         C vs BASIC            01/01/70 00:00      
            + or -?            01/01/70 00:00      
         Just wait...            01/01/70 00:00      
      BASIC            01/01/70 00:00      
   neither            01/01/70 00:00      
      The trouble with "BASIC"            01/01/70 00:00      
         'modern' BASIC is a truly horrible thingy.            01/01/70 00:00      
         tool            01/01/70 00:00      
         Portability            01/01/70 00:00      
            In Basic            01/01/70 00:00      
            if you don't have the time, why bother?            01/01/70 00:00      
   QBasic example. GPS NEMA checksum            01/01/70 00:00      
      a variant..            01/01/70 00:00      
      C            01/01/70 00:00      
         Andy Neil c GPS checksum buggy            01/01/70 00:00      
            minor problem            01/01/70 00:00      
               No longer the same as the BASIC            01/01/70 00:00      
                  correct            01/01/70 00:00      
                     Intersting on-topic point            01/01/70 00:00      
            Yes, probably - but not the point            01/01/70 00:00      
               The point is yours didn't work!            01/01/70 00:00      
                  Totally irrelevant            01/01/70 00:00      
            why the friggin capiltals            01/01/70 00:00      
            OK            01/01/70 00:00      
               he suckered you into it, didn't he            01/01/70 00:00      
                  benefit            01/01/70 00:00      
                     do you have any use for that knowledge?            01/01/70 00:00      
                        Benefit to nobody            01/01/70 00:00      
                           NMEA checksum OK. All is not lost            01/01/70 00:00      
                              Ironic, really!            01/01/70 00:00      
                                 Your errors were much more serious!            01/01/70 00:00      
                                    Fit for purpose            01/01/70 00:00      
                                       What's the point of this thread?            01/01/70 00:00      
                                          so who is beating the carcass?            01/01/70 00:00      
                                          So now it's your turn            01/01/70 00:00      
                                             Poor poor Andy. Just can't keep quite            01/01/70 00:00      
                                                if you think so            01/01/70 00:00      
                                                Andy can't keep quite what?            01/01/70 00:00      
                                                   quite quiet...            01/01/70 00:00      
               Thanks for correcting the c example            01/01/70 00:00      
                  it is in this context            01/01/70 00:00      

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