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string CRC

keobe
2014-04-12
2014-04-15
  • keobe

    keobe - 2014-04-12

    HI
    I have a string 'CA,0,0,3,0,0,1,ED$R$N'
    may i know how to write a source code using codesys 2.3 in ST to calculate the CRC of this string?
    Thanks

     
  • keobe

    keobe - 2014-04-13

    thank you for your suggestion,
    but the crc_gen only works on byte array, need to change the string to byte array! how, no lib function supports this conversion.

     
  • jzhvymetal

    jzhvymetal - 2014-04-15

    stolen from l viewtopic.php?t=948 l

    MyString AT %MW0: STRING(80);
    MyBArray AT %MW0: ARRAY [0..79] OF BYTE;

    OR

    byByte:BYTE;
    sString:STRING(8 ); (a normal string has a size of 80 chars)
    abyByte: pointer to POINTER TO ARRAY[0..7] OF BYTE;
    abyByte:=ADR(sString); (if lengths do not match you can get real weird problems)

    byByte:=abyByte^[i];

     

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