USB Device Endpoint Number

uranos74 — Wed, 17 Oct 2018 03:15:21 GMT

Hi ,

I'm working on i.MX6 Dual Solidrun's SOM + Hummingboard and build Linux Kernel 4.9.102 as my system.

I'm trying to designed OTG device mode using GadgetFS.

I could make /dev/gadget/2184000.usb. and ep0in/out ~ ep7in/out.

EP 2 and EP6 work using /dev/ep2out and /dev/ep6in.

I can make that my board send and recevice usb data with PC Applicaiion.

However My host side APP Program use Endpoint 2,4,6,8.

So I have to make /dev/ep8out device file.

I could found that the enpoint device files are made in /drivers/usb/gadget/legacy/inode.c

And I could found that number of enpoint value is in /drivers/usb/chipidea/core.c as below.

------------------------------------------------------------------------------------------------

reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
__ffs(DCCPARAMS_DEN);
ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */

------------------------------------------------------------------------------------------------

I could read the value of ci->hw_ep_max is 0x08.

So It can make only 16 nodes for enpoint device file (ep0in ~ ep7in 8ea and ep0out ~ ep7out 8ea)

----------------------------------------------------------------------

Device Controller Capability Parameters

DEN -> Device Enpoint Number

---------------------------------------------------------------------

Is it hardware specification of I.MX6 ?

How can I make /dev/ep8out file for Endpoint 8 ?

I have assigned EP address 0x08 to ep7out or ep6out But it didn't work.

Maybe Endpoints are mapped to each /dev/#ENDPOINT files.

Please let me know how can I do for it.

Thanks in Advanced!

Re: USB Device Endpoint Number

rajvikamdar — Wed, 16 Sep 2020 10:00:05 GMT

Hi @uranos74 did you get answer to this?

Re: USB Device Endpoint Number

jeminmorabia — Wed, 21 Jun 2023 12:10:37 GMT

Hi,

Can anybody provide update on how to support endpoint number 8 when USB is configured in device mode?

PC side host software uses endpoint 8 for communication with device but iMX6ULL only provides 0-7 IN and 0-7 OUT endpoints, no way to configure endpoint number 8.

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Re: USB Device Endpoint Number