In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Marshall,
  You cannot use any math within the array subscript. So the string(strlen -1) is not allowed.
  With some simple re-arrangement you can avoid the need to do the subtraction.
  See if this works:

DO
  READ idx, char
  idx = idx + 1
  string(strlen) = char
  strLen = strLen + 1
  GOSUB CalcCRC
  IF strLen = 15 THEN EXIT
  IF char = EOM THEN EXIT
LOOP


Bean

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