USB Open Accessory Mode. Included or how to add support in Android R10.4?

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USB Open Accessory Mode. Included or how to add support in Android R10.4?

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mbp
Contributor V

Need Open Accessory Support (provided in Android 3.1 and back supported to 2.3.4).  Cannot identify inclusion in Android R10.4.

Need to provide serial communication in Android via FTDI usb-to-serial adapter.

Can anyone tell me if it's included and if not How to add this support?

Has anyone done any serial-RS232 communication via USB on the Mx51 BBG or Mx53 EVK's ?

Thanks for any and all input!

Mike

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alejandrolozan1
NXP Employee
NXP Employee

Hi,

The kernel of Android 2.3.4 can support USB Serial already. The user needs to enable the corresponding USB Serial driver of kernel. For example, I want to enable USB Serial for PL2303. I need to set "CONFIG_USB_SERIAL_PL2303" of kernel. Then I can use a test application named "SerialPort" (Downloads - android-serialport-api - Accessing serial ports for Android - Google Project Hosting) to check USB Serial function.


Regarding Android Open Accessory mode, the user still needs to implement the corresponding driver into a library called by Android application. Here is an example, mik3y/usb-serial-for-android · GitHub  My understanding is the Android Open Accessory mode provides a consistent interface, but the user has to do the implementation.

Best Regards,

Alejandro

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mbp
Contributor V

Alejandro,

Thanks for your response.

You are partially correct. 

     The Kernel drivers must be enabled.

     However, the test application is simply not applicable for 2.3.4+ as it requires 3.1+ a different library (android.hardware.usb.*) whereas 2.3.4+ only supports a subset in (android.future.usb.*)


I have yet to see ANY sample test applications which support 2.3.4+  (API-10).


While an extensive rewrite may be possible - but it seems more likely easier to write your own based on Google's 2.3.4 documentation.... 


thoughts?

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