Comparing two strings

ryfitzger227

I've been doing a lot of work in the propeller and its probably been over a year since I've done anything with the stamp. I'm doing something that should be pretty simple. I'm sending out a string of "A," from my computer via serial port. What I'm wanting the stamp to do is simple - check to see if the input equals "A," and then light an LED.

Here's what I have so far..

serialInput VAR Byte

Main:


SERIN 16, 16780, [STR serialInput\1]


IF serialInput(0) = "A" AND serialInput(1) = "," THEN
' IF serialInput = "A," '-- produces an error


HIGH 15


ENDIF

GOTO Main

This may look stupid, but it's the only thing I could think of! Haha! Any ideas?

Mike Green

You've got the basic idea although I think the SERIN parameter should be "STR serialInput\2" since you're expecting two characters. I don't have my Stamp Manual handy, so I may be wrong. You do have to do everything a character at a time other than the SERIN. Stamp Basic has no provision for copying or comparing strings as such.

stamptrol

As Mike points out, there is no real string handling capability.

But, you may be able to use the "WAIT" modifier of the SERIN command to watch for a string of up to 6 characters. See the Helpfile under SERIN.

Cheers,

ryfitzger227

Mike Green wrote: »

You've got the basic idea although I think the SERIN parameter should be "STR serialInput\2" since you're expecting two characters. I don't have my Stamp Manual handy, so I may be wrong. You do have to do everything a character at a time other than the SERIN. Stamp Basic has no provision for copying or comparing strings as such.

I completely overlooked this! It works now. Thank you.

davejames

ryfitzger227 wrote: »

I completely overlooked this! It works now. Thank you.

I've marked your thread as "solved".