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Converting 4 digits inline ASCII to 16bit Hex/Dec

James Lee

Dear Experts,

Need some quick reference code in assembly which are supremely compact in size wise (as size of code is a big constraint now, so assembly is also the last option) used to convert an incoming serial ASCII line of digits to hex codes for computation. Roughly 4 ASCII digits, e.g. in ASCII: (31h 32h 33h 34h) to be read as 1234dec OR 4D2hex.

Appreciate some really good helping hands!

Cheers,
James

Parents
  • 0

    What's wrong with:

    U16 total = 0;
while (chars_to_process)
   {
   total = total * 10 + (getchar() & 0x0f);
   }

    I doubt coding that particular loop in assembly will save you a lot of bytes of code, but feel free.

    More error checking, or support for different input formats will cost more, of course.

    There's also atoi(), strtoul(), and sscanf(), depending on what functions you already use in your application.

Reply
  • 0

    What's wrong with:

    U16 total = 0;
while (chars_to_process)
   {
   total = total * 10 + (getchar() & 0x0f);
   }

    I doubt coding that particular loop in assembly will save you a lot of bytes of code, but feel free.

    More error checking, or support for different input formats will cost more, of course.

    There's also atoi(), strtoul(), and sscanf(), depending on what functions you already use in your application.

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