Convert Ascii Digits String to word var help

[flyway38]

Hello to all,

Am facing this task of converting to a word var, for use in some calculations, a value that is received as a ascii string, ex: "00800" that need it as a value of 800 in a word var.

Came up with this code below, but need some advice on a more efficient method to get same result.

Any ideas would be great.

function AsciiStringToWord(byte IN str[]) return word is
   -- Max LEN in str is 5 chars (Converting to word: max= 65535)
   var word wRtn
   var word len = count(str)
   var byte i
   var byte ii
   --
   for len using i loop -- Can be use STEP -1 ??
      --wRtn = wRtn + str[i]*(10^i) -- Can be used "^" for power operations ???

      -- This code would be enough

      -- Here my alternate code for same result

      case i of
          0: wRtn=wRtn+(str[5 - len + i]-48)
          1: wRtn=wRtn+(str[5 - len + i]-48)*10
          2: wRtn=wRtn+(str[5 - len + i]-48)*100
          3: wRtn=wRtn+(str[5 - len + i]-48)*1_000
          4: wRtn=wRtn+(str[5 - len + i]-48)*10_000
      end case
   end loop
end function

Thank you.

Kind regards,

Filipe Santos

[vsurducan]

Hi Fellipe, 

If the ascii string content is numbers 0 to 9, then perhaps you can use function string_to_ dword from strings.jal library. 

However I'm not sure is better than yours. It depends of what you try to hit: best structured source code, fastest hex code or lowest hw stack.

best wishes,

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[flyway38]

Hello Vasile,

Thank you for your input.

Will check that LIB.

Cheers,

FS