4 Replies Latest reply on May 4, 2014 9:13 AM by Terrencebarr-Oracle

GPIO Sample issues on Raspberry Pi

user8032606 May 2, 2014 3:34 PM

Hi.

I tried to write a simple led blinking sample with brand new JavaME 8 SDK, nut I get following error:

[ERROR] [DAAPI] iso=-1:There is unexpected error, when open GPIO pin 7

Source code and overall procedure I followed is exactly the one depicted at page General Purpose Input/Output

What can be wrong?

BTW, same code works on Emulator Device (only by changing GPIO ID used).

Thanks!

1. Re: GPIO Sample issues on Raspberry Pi

8139366c-bf61-43f0-9098-d777ecc6e782 May 3, 2014 11:29 AM (in response to user8032606)

I'm facing same error
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2. Re: GPIO Sample issues on Raspberry Pi

Terrencebarr-Oracle May 3, 2014 7:14 PM (in response to user8032606)

Hi,

Some things to check:

1) Are you running Java ME on the RasPi as sudo to make sure Java has full access to all peripherals? E.g. $ sudo usertest.sh
2) Did you request GPIO permissions for the MIDlet, and did you sign the MIDlet or set the NullAuthenticationProvider? See
Installing and Running Applications on the Raspberry Pi Board
3) Can you post the Java log?

Thanks,
-- Terrence
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3. Re: GPIO Sample issues on Raspberry Pi

user8032606 May 4, 2014 8:59 AM (in response to Terrencebarr-Oracle)

Sudo solved. What's weird is that I already tried it, but device registration/connection didn't work running usertest.sh as superuser...
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4. Re: GPIO Sample issues on Raspberry Pi

Terrencebarr-Oracle May 4, 2014 9:13 AM (in response to user8032606)

Glad it worked. sudo retains your user environment and settings but executes the command(s) with elevated permissions - this is different from running as superuser.
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