thanks, TJF, I will try John's method first, it seems easier.

This seems to be a problem with the ADC configuration. You could run one of 
> the libpruio examples io_input 
> <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/ChaExamples.html#SubExaIoInp>
>  
> or oszi 
> <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/ChaExamples.html#SubExaOszi>
>  
> to check the hardware or the example analyse 
> <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/ChaExamples.html#SubExaAnalyse>
>  
> to check the configuration. (The pins may be configured for touch screen?)
>
> To get more detailed information you should describe the steps you perform 
> to receive the ADC values. (Do you use sysfs, mmap, a library, ... ?)
>

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