[SOLVED] TP-Link WR842ND v2 no USB power, non-functional

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jester322
DD-WRT Novice


Joined: 27 Jul 2021
Posts: 11

PostPosted: Tue Jul 27, 2021 18:23    Post subject: [SOLVED] TP-Link WR842ND v2 no USB power, non-functional Reply with quote
Hi, dd-wrt community!
I have question regarding TP-Link WR842ND v2 router, previously I used it on factory firmware and never used USB port. Recently I flashed DD-WRT v3.0-r47086 std (07/22/21) and planned to use USB flash stick via JFFS. But there is no power on USB (stick is not blinking), dmesg shows nothing when I insert stick, also I tried to insert stick before router power on and no result.

I tried googling on this topic and found these links, but they are not related to DD-WRT:
https://forum.openwrt.org/t/tl-wr842nd-v2-no-usb-power-after-switching-to-ath79/38052
https://bugs.openwrt.org/index.php?do=details&task_id=2753&order=id&sort=desc
Is it possible that DD-WRT is also affected?

P.S. Also I cannot be sure 100% that my USB port is working, I never used it since bought it in store, so I assume it should work.
Thanks
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MuzzleVelocity
DD-WRT User


Joined: 23 Apr 2010
Posts: 125

PostPosted: Wed Jul 28, 2021 2:16    Post subject: Reply with quote
did you enable USB core support on SERVICES -> USB ?
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Wed Jul 28, 2021 3:30    Post subject: Reply with quote
I don't have that enabled on my TL-WR1043NDv2 and I can still charge a cell phone from the USB port. I didn't find anything askew in the kernel configs and such that would prevent it from working, but I've already emailed BrainSlayer regarding this.
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BrainSlayer
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Posts: 7463
Location: Dresden, Germany

PostPosted: Wed Jul 28, 2021 5:52    Post subject: Reply with quote
some routers (about 90%) have a especial gpio for enabling the usb port. enabling usb is a requirement for getting the port to work. the wr842v2 has such a gpio. so usb will not work unless you enable it at the usb tab
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BrainSlayer
Site Admin


Joined: 06 Jun 2006
Posts: 7463
Location: Dresden, Germany

PostPosted: Wed Jul 28, 2021 6:02    Post subject: Reply with quote
i fixed a gpio issue on wr842v2 in 47094 which explains the usb issue
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BrainSlayer
Site Admin


Joined: 06 Jun 2006
Posts: 7463
Location: Dresden, Germany

PostPosted: Wed Jul 28, 2021 6:15    Post subject: Reply with quote
testbuild for wr842v2
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jester322
DD-WRT Novice


Joined: 27 Jul 2021
Posts: 11

PostPosted: Thu Jul 29, 2021 13:15    Post subject: Reply with quote
Much better now, thanks! (it works)
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