Read RasPi GPIO

Hi,

I can successfully read a GPIO Pin on the RasPi if I do it like:
|value|
dataFile ensureOpen.
value := dataFile upToEnd.
dataFile close.
^value

dataFile is the /sys/class/gpio/gpioxx/value file that exists after
exporting gpioxx.

Without the reopening and closing of the file I get '' on subsequent
reads which means that
StandartFileStream>>basicNext answers nil.

Is there a way to get the values without having to close and reopen the
file each time?

Thanks

Herbert
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Wonderful,
dataFile reset.
^dataFile upToEnd

I thought every read request would just produce a new value.

Thanks,

Herbert

does the trick

Is there a StandardFileStream>>reset?

Michael

On Wed, Jan 28, 2015 at 7:45 AM, Herbert König <[hidden email]> wrote:

Hi,

I can successfully read a GPIO Pin on the RasPi if I do it like:
|value|
dataFile ensureOpen.
value := dataFile upToEnd.
dataFile close.
^value

dataFile is the /sys/class/gpio/gpioxx/value file that exists after exporting gpioxx.

Without the reopening and closing of the file I get '' on subsequent reads which means that
StandartFileStream>>basicNext answers nil.

Is there a way to get the values without having to close and reopen the file each time?

Thanks

Herbert
_______________________________________________
Beginners mailing list
[hidden email]
http://lists.squeakfoundation.org/mailman/listinfo/beginners

_______________________________________________
Beginners mailing list
[hidden email]
http://lists.squeakfoundation.org/mailman/listinfo/beginners

_______________________________________________
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[hidden email]
http://lists.squeakfoundation.org/mailman/listinfo/beginners

_______________________________________________
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http://lists.squeakfoundation.org/mailman/listinfo/beginners