If then

Neoneuron

Hello again!

I tried to make this program work. It is from the What is a Microcontroller PDF that we have here on the Parallax Website, pages 81-82. It keeps stopping at THEN. The error says: 'Expected a Label'

Thanks for any Help!!

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

DO

DEBUG ? IN3

IF (IN3 - 1) THEN

HIGH 14
PAUSE 50
LOW 14
PAUSE 50

ELSE
PAUSE 100

ENDIF

LOOP

Mike Green

You mistyped the $PBASIC statement. Notice that you have an open parenthesis ( at the beginning when what you need is an open brace {

The $PBASIC statement is being treated as an ordinary comment and the compiler is using the 2.0 version of the PBASIC syntax.
The 2.0 version requires a label after the THEN. The 2.5 version allows DO / LOOP and IF / ELSE / ENDIF. Version 2.0 is the default.

JeanD

With the PBasic, "IF THEN" is a bit special. Well at least that was my experience with a BS2 chip.
You can't just throw instructions after a THEN.
In fact THEN calls a sub-program.

For instance :

IF x = 3 THEN subname

subname :

INSTRUCTIONS

Neoneuron

Thanks again Mike!!