4 Replies Latest reply on Mar 14, 2016 1:35 AM by 9ee6e931-c37a-4cfb-b1d3-c8c319072c6e

Terminate USB host mode on TC75?

9ee6e931-c37a-4cfb-b1d3-c8c319072c6e Mar 11, 2016 5:03 AM

Hello.

We are developing an HW add-on device for the TC75/TC70 with a Silabs CP201x USB-to-serial chip in it.

We would like to be able to switch the USB port mode from inside our Android application.

We want to switch the USB power supply from the TC75 to the add-on device to prevent draining the TC75 battery when the add-on device is not used.

So my question is: Is there a way to terminate USB host mode by EMDK API?

Re: Terminate USB host mode on TC75?

Billie Hecox Mar 11, 2016 6:07 AM (in response to 9ee6e931-c37a-4cfb-b1d3-c8c319072c6e)

Hi Richard, I'm not positive how this setting in the USBManager is implemented, it may just disable mounting of external drives, but it could possibly provide what you are looking for. USB Manager - Zebra Technologies Online Documentation
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- Re: Terminate USB host mode on TC75?
  
  9ee6e931-c37a-4cfb-b1d3-c8c319072c6e Mar 11, 2016 7:02 AM (in response to Billie Hecox)
  
  Hi Bill.
  
  We tried to to disable "USB Module Usage" by StageNow.
  This does not work. It just disables any USB usage - for example using ADB over USB.
  
  And that's exactely what I understood from the documentation:
  "This parm allows you to specify whether the use of USB module will be allowed."
  
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  - Re: Terminate USB host mode on TC75?
    
    Billie Hecox Mar 11, 2016 7:20 AM (in response to 9ee6e931-c37a-4cfb-b1d3-c8c319072c6e)
    
    The Parm I'm thinking of was not USB Module, but usb external storage param.
    
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    - Re: Terminate USB host mode on TC75?
      
      9ee6e931-c37a-4cfb-b1d3-c8c319072c6e Mar 14, 2016 1:35 AM (in response to Billie Hecox)
      
      Hello Bill.
      
      No, that also does not switch USB host mode. We just tested this option with StageNow.
      
      My understanding of all the USB Manager APIs is that they work on a software level only by enabling or disabling the respective USB protocols or USB driver options.
      
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