ASCII Lower/Uppercase Conversion

[BITS N BYTES 66]

Using CJIM-CPU21 for RS232 serial communications from a host device. I have defined the message format and protocol but the host device cannot [more like integrator will not] guarantee that message strings will be in the same case [uppercase/lowercase]. In some instances the case could even be mixed in the same message string. Does anyone have a neat idea to convert all characters in the RECEIVED message string to uppercase format??

[Guest anonymous]

The only thing that I can think of would be to examine the ASCII value of each digit, (lower case a - z = 61 to 7A, upper case A - Z = 41 to 5A), then if the incoming value is between 61 and 7A, subtract 20 (hex). That's about it from me!

[BITS N BYTES 66]

Thnx anonymous, that looks like a very simple solution I would not have thought of. I guess I have been working with BITS N BYTES too long. Need to improve my WORDS N MESSAGES skills.

[Jay Anthony 118]

Put this in a loop by using FOR and NEXT and increment the character counter before returning to the top of the loop.

[Sleepy Wombat 27]

You obviously were tyring to BYTE off more then you could chew..... Rembember, to solve complicated problems it helps to break them down into smaller portions...Therefore only a NIBBLE at a time is required and pretty soon you would have finshed a whole meal....