topic Re: Device only mode in i.MX Processors

Device only mode

mathew_k_t — Tue, 27 Feb 2018 12:55:29 GMT

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).

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

Re: Device only mode

igorpadykov — Tue, 27 Feb 2018 23:17:30 GMT

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?

> 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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Re: Device only mode

mathew_k_t — Wed, 28 Feb 2018 03:36:30 GMT

Thank you Igor,

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

Re: Device only mode

igorpadykov — Wed, 28 Feb 2018 05:46:26 GMT

Hi mathew_k_t

correct, peripheral dr mode is device mode.

Best regards
igor

Re: Device only mode

mathew_k_t — Wed, 28 Feb 2018 07:04:52 GMT

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

Re: Device only mode

igorpadykov — Wed, 28 Feb 2018 07:35:57 GMT

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.pdf

Re: Device only mode

mathew_k_t — Wed, 28 Feb 2018 11:33:57 GMT

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