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Change direction of a pin on GPIOA from an app???



Hello!!
 
Can anybody tell me how to:
 
1. Change the direction of a pin on GPIOA from an application and then
    how to read and write to the pin using ioctl:s???
 
2. Use par0 for I/O?? Can I use the same code as for GPIOA but just open a diffrent device??
    Is it possible to first write to a pin and the read from it in my application?? If so how??
 
Best regards
/ Johan H