[BRLTTY] Compiling brailleback with brltty 5.4

[payman shaykhmehdi]

Ok,
I have compiled brltty for android, but currently my device has no
bluetooth hardware, so I need to connect braille display to the android
device via usb.

My device and it's driver are listed in the device setting of brltty app
and I can select them, but there is no braille output.

Here is the output of "adb logcat " command that related to brltty :

D/brltty  (18813): activity state change: braille-driver: 6[starting]
> D/brltty  (18813): checking braille device:
> usb:vendorIdentifier=0X03EB+productIdentifier=0X2013+serialNumber=null
> D/brltty  (18813): checking for braille driver: pa
> W/linker  (18813): libbrlttybpa.so: unused DT entry: type 0x6ffffffe arg
> 0x644
> W/linker  (18813): libbrlttybpa.so: unused DT entry: type 0x6fffffff arg
> 0x1
> E/brltty  (18813): dlopen failed: cannot locate symbol
> "dotsTable_ISO11548_1" referenced by "libbrlttybpa.so"...
> E/brltty  (18813): cannot load braille driver:
> /data/data/org.a11y.brltty.android/app_drivers/libbrlttybpa.so
> E/brltty  (18813): braille driver not loadable: pa
> D/brltty  (18813): braille driver not found
> D/brltty  (18813): activity action failed: braille-driver: start
> D/brltty  (18813): activity state change: braille-driver: 2[scheduled]
>

This driver works fine on ubuntu, and I don't know what is the problem
here?


On Sat, Nov 12, 2016 at 5:13 PM, Dave Mielke <dave at mielke.cc> wrote:

> [quoted lines by payman shaykhmehdi on 2016/11/12 at 16:04 +0330]
>
> >I don't know what was the problem, but  after configuring the project to
> >compile only with my driver and ignoring all other braille display
> drivers,
> >this makefile problem resolved!
>
> That's a mystery that wouldn't leave me feeling very comfortable.
>
> >> Do you know that brltty does run on Android?
> >
> >I have not tested brailleback yet, but it seems that it uses brltty for
> >braille output.
>
> I think you misunderstood what I'm saying. Brltty itself runs on Android.
> You
> could, therefore, just build brltty-5.4 for Android. Then we'd be able to
> help
> you directly with any problems you're having.
>
> >I have compiled brltty only with my braille display driver, but
> brailleback
> >has some wrapper files for brltty that doesn't match with brltty 5.4.
>
> You may have missed something else that I'd said. You could try with
> brltty-4.6, which is a branch that didn't get released. It was, in fact,
> created specifically for the BrailleBack people so that 5.x drivers could
> be
> much more easily included in a 4.x build.
>
> >have tried to fix mismatches but I couldn't. For example in file
> >https://github.com/google/brailleback/blob/master/braille/service/jni/
> brlttywrapper/BrlttyWrapper.c
> >, there is a function call for bluetoothAndroidSetConnection() and in 5.4
> >we don't have this function and I don't know what is the equivalent
> >function in current version.
>
> That isn't a brltty function, so, in fact, no brltty release has ever
> supported
> it.
>
> The reality is that any code written to wrap brltty-4.x core code simply
> won't
> work when wrapping brltty-5.x core code. The reason is that brotty, before
> 5.x,
> used to poll for events whereas brltty 5.x is now interrupt-based.
>
> >Is it possible for you to provide these wrapper files with brltty
> releases?
>
> I myself have no particular interest in doing that since we'd never be
> testing
> them. My preference would be for you to just use brltty-5.4 on Android, and
> then let us know how we can improve it. The best, of course, would be for
> you
> to be building with the latest development code.
>
> --
> Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of
> God.
> Phone: 1-613-726-0014 | Ottawa, Ontario   | http://Mielke.cc/bible/
> EMail: Dave at Mielke.cc | Canada  K2A 1H7   | http://FamilyRadio.org/
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