GPIO on Raspberry PI 2 Model B

Etienne Gagnon

I recently bought a Raspberry Pi 2 Model B and I'm trying to complete this guide: Working with GPIO by Using Java Embedded and a Raspberry Pi

After some permissions problems I finally got it to run.  However the GPIOs doesn't seem to be affected by the code.  I tried different pins with no success.  I'm thinking of some kind of pin mapping problem since the JAVA ME seems to only support Raspberry Pi Model B.  Is there a way to make the hardware of the Raspberry Pi 2 Model B work on JAVA ME?

Thanks and have a nice day.

Sergey.N-Oracle

Hi!

I see no difference in pin configuration between B+ and Pi2

http://www.element14.com/community/docs/DOC-68203/l/raspberry-pi-b-gpio-40-pin-block-pinout

Raspberry Pi 2 Model B GPIO 40 Pin Block Pinout | element14

Could you check if pins are accessible by /sysfs like described here RPi Low-level peripherals - eLinux.org?

/Sergey

Etienne Gagnon

Thanks for your answer.

You're right I managed to make it work yesterday.  For anyone having problem with GPIO the two things that caused me problem was:

• You have to run the Application Management System on root so make sur you use "sudo ./usertest.sh".
• The ID of the GPIOPinConfig constructor and the ID from the DeviceManager.Open is the GPIO number NOT the pin number.
• Always open a pin that has been configured using GPIOPinConfig instead of a directly from a ID.  The emulator will auto set a GPIO to an output but the RPi2 GPIOs are inputs by default so you'll get an exception if you try to set them.

After solving those, everything I tried worked.