1 Reply Latest reply: May 26, 2014 5:30 AM by Sergey.N-Oracle RSS

    Accesing GPIO using JAVA and Python/PHP

    user10303583

      Hello All,

      I apologize for posting this in the JAVA ME Embedded section. I had previously posted this under the JAVA Embedded MOOC section. I just realized then there is another space for JAVA ME issues.

       

      I am accessing my GPIO pins using PHP and JAVA. However, there is an issue when the pin is exported as input/output by PHP (or manually) before it is accessed using JAVA.

      As an example, when the pin is configured as output by my php code  (or manually echo 7 > /sys/class/gpio/export), I get an exception in my JAVA code when I try to create an instance of this GPIO pin (pin 7).

       

      DeviceManager.open(7) throws the exception "[ERROR] [DAAPI] iso=-1:There is unexpected error, when open GPIO pin 7"

       

      Is there a way to create an instance of GPIOPin for an pin that has already been exported out as an I/O?

       

      Thanks,

      Mahesh Ganapathy