Android Question error message in felUsbSerial example

[yaniv hanya]

Hello, I"m using the felUsbSerail jar to connect tablet to usb port, which in his turn connect to microchip serial device.

the app connect to the device, and ask for permission, but when I click "connect" it crushes...

this is the LOG-
--------- beginning of main
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
Resume
** Activity (main) Pause, UserClosed = false **
--------- beginning of system
** Activity (main) Resume **
Resume
Number of devices: 1
Ready to start...
Buffer size: 16384
Error occurred on line: 74 (Main)
java.lang.RuntimeException: Error opening serial device.
at anywheresoftware.b4a.objects.usb.felUsbSerial.Initialize2(felUsbSerial.java:82)
at anywheresoftware.b4a.objects.usb.felUsbSerial.Initialize(felUsbSerial.java:62)
at b4a.example.main._btnconnect_click(main.java:535)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:176)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:5624)
at android.view.View$PerformClick.run(View.java:22441)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6316)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

 

[Erel]

Which type of serial device are you using (FTDI, CH340, ...) ?

 

[yaniv hanya]

just talk with microchip developer. he said it is CDC. we will try to change it to ch340 and check again, may be it will work. if not, I"l get back to you.

thanks a lot

 

[Erel]

Not all Android devices properly support USB host. Use an app such as this one https://play.google.com/store/apps/details?id=com.keuwl.usbhost and see whether the USB is recognized at all.

felUsbSerial does support CDC devices.

 

[yaniv hanya]

this is the first thing I checked. the device recognize and get bytes from application I downloaded from google play. I sent and received info/

 

[Erel]

Worth trying with USBSerial2: https://www.b4x.com/android/forum/threads/usbserial-library-2-0-supports-more-devices.28176/

 

[yaniv hanya]

thanks erel, it is connecting, and I can see the device name and properties. when I try to send information I get error message. I"m trying to find what's the problem, because as I said, it is working with goggle play examples.

 

[Erel]

Where is the error message?

 

[yaniv hanya]

in the "connect" command. the permission work fine, the first msgBox show the correct device (the correct model of microchip), and the connect crushes.

 

[Erel]

Check the unfiltred logs. They should include more information.

 

[yaniv hanya]

I unchecked the filter checkbox, this is what I got-

לוגר מחובר ל: LGE LG-H870
--------- beginning of system
Timeline: Activity_idle id: android.os.BinderProxy@ef10d4d time:30548116
ViewRoot's Touch Event : ACTION_DOWN
ViewRoot's Touch Event : ACTION_UP
Timeline: Activity_idle id: android.os.BinderProxy@ef10d4d time:30558311
ViewRoot's Touch Event : ACTION_DOWN
ViewRoot's Touch Event : ACTION_UP
ViewRoot's Touch Event : ACTION_DOWN
ViewRoot's Touch Event : ACTION_UP
--------- beginning of main
Log reader error: java.io.InterruptedIOException: read interrupted
-1 received
writer error
java.lang.InterruptedException
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2010)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2044)
at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:358)
at anywheresoftware.b4a.remotelogger.Connector$Writer.run(Connector.java:160)
at java.lang.Thread.run(Thread.java:761)
Starting remote logger. Port: 29705
After accept

 

[Erel]

What happens when you try to connect to the USB device?

What you see in these logs is not an error.