Android Question [SOLVED] felUsbserial with android marshmellow...

[rbghongade]

Dear friends,
I have successfully interfaced arduino duemilanove with android phone (android 4.4 ), but if I try to use the same apk on a phone running marshmellow 6.0.1 , the usb connection is not recognised. Is this a known issue with marshmellow?
I have followed all instructions about modifying manifest file, used device_filter.xml (making it read only), even changed the target sdk to API 23.
Even using Genymotion emulator , the connection works for android 4.4 (kitkat) and not for android 6.0.1 (marshmellow).
Seems to be a problem with marshmellow.
Any solution is highly appreciable.
regards,

 

[Erel]

I don't think that it is related to the OS version. Not all devices support USB host mode.

 

[rbghongade]

Dear Erel,
Forgot to mention that Slick USB 2 Serial Term works well, hence no device issues there!

 

[Erel]

What happens when you click on the connect button?

 

[rbghongade]

Log displays the "No usb devices" .

 

[Erel]

This means that the USB host manager didn't recognize any USB device. It is not related to felUsbSerial.

If you have root access then you can try this: https://www.b4x.com/android/forum/t...rs232-adaptor-driver.11449/page-3#post-121125

 

[rbghongade]

Dear Erel,
Let me summarise my experience:
To start with I was not able to detect usb device on android (phone model MI5 running Marshmellow). I connected Arduino Duemilanov to phone and now the device gets detected and usbserial 2.4 library works great, plotting the analog data on screen. I tried to connect Arduino Mega 2560 ( not ADK) and it does not work! I have attached log of usb1.DeviceInfo(1), screenshot of DroidTerm and my project. Interesting thing is that an app called "DroidTerm" is able to connect and display the adc values! I am confused as to where the actual problem lies! Please help!
regards,

 

[Erel]

Try to use felUsbSerial instead and see whether it works.

 

[rbghongade]

Dear Erel,
Finally solved the problem. It was nothing to do with felusb serial library! My pea-sized brain could not realize then, that it was a problem of creating a text file for logging and marshmellow was not granting permission for the same ! Removed the file writer code and it works as expected! Sorry to bother you!