IF ELS and Labels

earthlingzed

I am a newby getting myself acqquainted with the BS2, but I ahve a bit of programming expereince.

I am trying to create a simple if else statement and I keep getting error 148 asking for a label.
What is a label? It is not something I have run across in any other programming language.

Here is what I am trying to do:

' {$STAMP BS2}
' {$PBASIC 2.0}

INPUT 6
OUTPUT 7

Main:
LOW 7

  IF (IN6 = 1) THEN
    HIGH 7
  Else
    LOW 7
  END

GOTO main

Newzed

When you write an If..then, it must end with "endif", not end.

The exception to this is if you write:

if in0 =0 then high 5

With a one-line command you do not need the endif.

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Sid Weaver
Do you have a Stamp Tester?

http://hometown.aol.com/newzed/index.html
·

Jon Williams

First: You MUST use 2.5 syntax to get IF-THEN-ELSE.· In PBASIC 2.0 (which you have selected) you can only use the IF-THEN-Address version.
Second: PBASIC 2.5 lets you define an IO pin as a PIN, and can simplify syntax.· Thus, your example becomes:

' {$STAMP BS2}
' {$PBASIC 2.5}

 
Ctrl    PIN    6
Led     PIN    7
 
Reset:
  LOW Led                    ' make output and off

Main:
  Led = Ctrl
  GOTO Main

The key is that the compiler knows that your pins are pins and coverts

Led = Ctrl

to:

OUT7 = IN6

You next logical question is: What if I want to change to an active-low input?· No problem· Change the line to:

Led = ~Ctrl

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

earthlingzed

Thanks for the help. Once I switched to version 2.5 I had no trouble getting my simple application to work.

Many thanks!