Serial Port Permission Errror

Discussion of your EDM baseboard, your add-on boards or other peripherals for your wandboard.

Serial Port Permission Errror

Postby festez » Sun Nov 03, 2013 4:41 pm

Hello to all,
I have a Wandboard DUAL.
I downloaded the Android image from the official website of the Wandboard.
I developed a small program, and I determine the number and names of the various ports installed on the board.
Unfortunately, when i try to open the resource /dev/ttymxc0 I get the error java.io.IOException.

If I connect a null modem cable to my pc, I can read all the information via the console (with putty.exe).
I attach a file containing the information that I read through the console.

I also thought that access to the resource /dev/ttymxc0 is prevented as is already being used by the console.
In fact, I stopped U-Boot and I typed the following commands:

Code: Select all
setenv bootargs console= init=/init video=mxcfb0:dev=hdmi,1280x720M@60,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=28M vmalloc=400M androidboot.console= androidboot.hardware=freescale
saveenv
boot


After doing this, the console appears to be disabled (putty does not read any more information), but always reflected the following errors: java.io.IOException

My goal is to use my Wandboard for building automation.
I should connect the Wandboard with slave devices using the MODBUS RTU.

Can anyone help me?


Sorry for my english.
Attachments
boot.rar
(7.42 KiB) Downloaded 171 times
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Re: Serial Port Permission Errror

Postby Tapani » Mon Nov 04, 2013 2:07 am

My suspicion would indeed be towards the fact that ttymxc0 is used as debug console.
The binding happens also in the kernel, so a kernel modification (and recompile) is probably needed too before the port can be used for other purposes.
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Re: Serial Port Permission Errror

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Re: Serial Port Permission Errror

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Re: Serial Port Permission Errror

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