if then problem

[Russ Kincaid]

This has got to be simple but I can't see the problem. This is my code:
if not GPIO.1 then time1 = 1 else time1 = 0
endif
IF not GPIO.2 THEN time2 = 2 else time2 = 0
endif
IF not GPIO.3 THEN time4 = 4 else time4 = 0
endif
if not GPIO.4 then time8 = 8 else time8 = 0
endif
The compiler error is: bad expression or missing THEN
I tried putting colons in it even tho the manual doesn't say they are needed, but that was no help.

Hmmm, I copied an IF THEN out of the manual and ran it thru the compiler, same error. What's up?

Russ

[Darrel Taylor]

You can't put the else part on the same line as the IF.

It should look like...

if not GPIO.1 then
    time1 = 1 
else 
    time1 = 0 
endif

But then, all you are really doing is inverting the bit, so you could do this.

time1 = GPIO.1 ^ 1
time2 = GPIO.2 ^ 1
time3 = GPIO.3 ^ 1
time4 = GPIO.4 ^ 1

OR, you could do them all at once if the variables are setup right.

time    VAR BYTE
  time1 VAR time.1
  time2 VAR time.2
  time3 VAR time.3
  time4 VAR time.4

time = GPIO ^ %11110

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[Russ Kincaid]

Thanks, I can see I have a lot to learn. What is that carot thingy doing? If GPIO is high, does it make it low and vice versa?

[Archangel]

Thanks, I can see I have a lot to learn. What is that carot thingy doing? If GPIO is high, does it make it low and vice versa?

Hi Russ,
see page 36 section 4.17.14 Bitwise Operators
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