basic question reading inputs

Ell

I am sorry for posting such a basic question but, I have been trying to read a switch closing and turning on an LED when it does. I am not new to programing pics,but I am·new to the spin language,·but I am no expert either.It would seem like it would be a simple if..then statement. If someone could show me a simple program displaying how the if statement works I would be indebted. This is what I had. I turned on the block indicators I can not think of what I would be doing wrong.

{switch}
pub sw

dira[noparse][[/noparse]0]~~
··
· repeat
···if ina[noparse][[/noparse]1] == 1
···· outa[noparse][[/noparse]0]~~

·

Oldbitcollector (Jeff)

Here's some code from the PEkit Labs.

[size=2][code]

[b]PUB[/b] ButtonLed                                ' Pushbutton/Led Method

    [b]dira[/b][noparse][[/noparse]­0]  := 1                            ' P0  → output
    [b]dira[/b][noparse][[/noparse]­1] := 0                             ' P1 → input (this command is redundant)
                                             
    [b]repeat[/b]                                   ' Endless loop

       [b]outa[/b][noparse][[/noparse]­0] := [b]ina[/b][noparse][[/noparse]­1]                    ' Copy P1 input to P0 ouput       

[/code][/size]




Try the PEkit labs, you'll find a lot of information there.
http://forums.parallax.com/showthread.php?p=617192

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Post Edited (Oldbitcollector) : 10/15/2008 3:46:28 AM GMT

Ell

thank you very much. I'll check those websites out

Beau Schwabe

Ell,

If you want to get tricky, you can configure one of the counters to function as a simple·logic inverter gate with a 12.5ns propagation delay that·won't require any processor overhead.· That way you are free to do other things in code rather than using an IF/THEN statement to set the pin state.

Note: you only need to call "PUB Inverter" once in your code.

CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
 
APIN = 0        'Input Pin
BPIN = 3        'Output Pin
 
PUB MainProgram
    Inverter                                'Start counter to function as an inverter
    repeat                                  'Endless loop ; Keep COG alive

PUB Inverter
    DIRA[noparse][[/noparse]BPIN]~~                            'Make BPin an Output
    CTRA :=  %01001 <<26 | BPIN <<9 | APIN  'Setup counter for POS detector with Feedback mode
    FRQA := 1                               'Start Counter

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Cluso99

@Beau: I hadn't thought of using a counter like that. I haven't played with the counters but I know there must be a lot of uses for them.
Thanks for the enlightenment