Android Question USBSerial 2.4

[DT1111]

The USBSerialDemo is running properly from my tablet and I was able to communicate with the external device.

But when I run the same USBSerialDemo on my Android box and plugged in the same device, I had the screen frozen and the camera snapshot as follows

The outputs are different and I could not decipher what might have caused the Android box to fail.

Both run on 4.4.2.

Any pointer is appreciated.

Thanks.

 

[Erel]

It looks like a low level problem, which means that the USB host feature is not implemented properly on the second device.
You can also try felUsbSerial library.

 

[DT1111]

Thanks Erel.

Perhaps I should have also mentioned that when I plugged in the external device into the second device (Android box), it detected it and calls the USBSerialDemo app.

But maybe that is not an indication that the USB host feature is actually OK in the Android box? Or is it?

 

[Erel]

What is the output with felUsbSerial?

 

[DT1111]

Hi Erel

Tested felUSBSerial on the Android box and it crashed ie just disappeared off the screen when the connect button was pressed. The following is the output

** Activity (main) Pause, UserClosed = false **
** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
Error occurred on line: 50 (Main)
java.lang.RuntimeException: UsbDevice is not supported.
    at anywheresoftware.b4a.objects.usb.felUsbSerial.Initialize2(felUsbSerial.java:71)
    at anywheresoftware.b4a.objects.usb.felUsbSerial.Initialize(felUsbSerial.java:54)
    at b4a.example.main._btnconnect_click(main.java:415)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:697)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:336)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:157)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:153)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:78)
    at android.view.View.performClick(View.java:4438)
    at android.view.View$PerformClick.run(View.java:18422)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5017)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:788)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:604)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Pause, UserClosed = true **
** Activity (main) Resume **
GC_CONCURRENT freed 398K, 23% free 2008K/2588K, paused 10ms+8ms, total 91ms

Line 50 is

usbserial.Initialize("serial", device, -1)

I have used the USB to USB OTG adapter to connect to Android box and without and in both cases it didn't work. Any suggestion what could be done to the Android box?

felUSBSerial worked well with the tablet though.

Thanks.

 

[Erel]

You can try to install a different ROM.

 

[DT1111]

Sorry Erel but I have more questions.

I assume ROM means new firmware? If it is then the manufacturer may be able to assist.
Or it is something that is freely available from Githubs etc?

What is the ROM for? Is it to enable rooting or USB hosting capability?

Any guidance would be most helpful.

Thanks.

 

[Erel]

It means to install a completely new OS on your device. It is impossible to say whether it will fix this issue or not.