Is there a way to do an (If Then ) statement in spin I should add If then Goto

mikediv

Hi guys here is a very simple spin program
CON
··· _clkmode = xtal1 + pll16x
··· _xinfreq = 5_000_000
Con Pin=4···· 'set pin to equal 4
Pub myledandinput
·· dira[noparse][[/noparse]pin]:=1····· ' set pin 4 to output
·· !outa[noparse][[/noparse]pin]
·· Dira[noparse][[/noparse]21]:= 0················ ' make pin 21 an input
·· If Then ?????????????????????
·· ina[noparse][[/noparse]21]
·· outa[noparse][[/noparse]6] := ina[noparse][[/noparse]21]··················· ' Copy P21 input to P6 ouput

I need to use a command like If-Then I can not find anything in the manual ,,that I understand anyway" on how to do this.
I want to read an input pin and "IF" its in a certain conditon jump to another part of the program so something like If pin 4 equals 1 then goto Con or Pub??
As always thanks in advance
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Mike Green

There is an IF statement. It doesn't use THEN. Spin uses indenting for that sort of thing.

There are no gotos in Spin, so you can't goto some other part of your program. You have to use the various structured statements like IF and REPEAT and CASE. There are plenty of examples in the Propeller Manual and the tutorials. There's a getting started 'sticky' thread: http://forums.parallax.com/showthread.php?p=791527.

MagIO2

If ina[noparse][[/noparse] 4 ]
    ' write whatever commands needed or call a pub procedure here
else
    ' do something else

Please note: The indentation is very important here.

The condition in if is true, whenever the value is different from 0 (zero). The condition given here is equal to "if ina[noparse][[/noparse] 4 ]==1".

Post Edited (MagIO2) : 3/30/2009 7:15:26 PM GMT

Baggers

MagIO2,

you have to do [noparse][[/noparse] 2 ] with spaces in otherwise it changes font size like so· this is [noparse][[/noparse] 2 ]· this is [noparse][[/noparse] 3 ]· etc.

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mctrivia

if ina

is the same as if ina!=0

not ==1 if it=2 it is still true

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mikediv

Thanks guys both examples worked out for me
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