Device only mode

[mathew_k_t]

Hi,

My custom board based on imx6ull has only one USB. I would like to configure it in a device only mode. When I go through the documents, I found different modes (Host, otg, peripheral and gadget).

1. Could you provide some details about these dr modes and how it differs?

   2. Also, I have to use the same port for serial downloading. Is there any issue with serial downloading while implementing device only mode?

   3. I hope implementation in device mode will help to read files from device, when connected to a PC. Please confirm this?

Regards

[igorpadykov]

Hi mathew_k_t

description of modes can be found in usb chapter 65 of i.MX6Q Reference Manual

http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf 

>  2. Also, I have to use the same port for serial downloading. Is there any issue with serial downloading while >implementing device only mode?

no

>   3. I hope implementation in device mode will help to read files from device, when connected to a PC. Please >confirm this?

confirmed.

Best regards
igor
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[mathew_k_t]

Thank you Igor,

From the document you have sent, I think configuring in peripheral dr mode can achieve the device mode. Is that correct?

[igorpadykov]

Hi mathew_k_t

correct, peripheral dr mode is device mode.

Best regards
igor

[mathew_k_t]

 But, while implementing peripheral mode, we cannot access the storage. How to enable access to storage and read/write to it?

[igorpadykov]

as described in p.273 attached Linux Manual:

"Peripheral mode-Supports MSC, and CDC which include ethernet and serial support"

MSC(USB Mass Storage Class Specification) :

http://www.usb.org/developers/docs/devclass_docs/Mass_Storage_Specification_Overview_v1.4_2-19-2010.... 

[mathew_k_t]

As mentioned in the previous answers, I configured it in peripheral mode. Now Could you explain how to read data from the device?