odroid-n2 shutdown with usb-uart

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textkiller
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odroid-n2 shutdown with usb-uart

Unread post by textkiller » Sat Apr 06, 2019 8:25 pm

Every time I connect usb-uart module to odroid-n2, odroid-n2 is shut down.

Should I do something to connect uart ?

my usb-uart module:
https://www.hardkernel.com/shop/usb-uart-module-kit/

Image: ubuntu-18.04.2-4.9-minimal-odroid-n2-20190329.img

connected peripherals:
- usb-uart module
- DC adapter (hardkernel official)

My PC
OS: macos 10.14.4
driver: https://www.silabs.com/products/develop ... cp-drivers

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mad_ady
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Re: odroid-n2 shutdown with usb-uart

Unread post by mad_ady » Sat Apr 06, 2019 11:08 pm

So - you're connecting to the uart port on the N2, right?
If you attach to the serial port with screen from your MAC and power on the N2 do you get any messages/blue led blinking on the uart adapter? If you do, what do they say?
Does the uart become hot when you connect it to usb? Make sure it doesn't touch the metal frame of the N2.

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Re: odroid-n2 shutdown with usb-uart

Unread post by textkiller » Sun Apr 07, 2019 8:31 pm

mad_ady wrote:
Sat Apr 06, 2019 11:08 pm
So - you're connecting to the uart port on the N2, right?
If you attach to the serial port with screen from your MAC and power on the N2 do you get any messages/blue led blinking on the uart adapter? If you do, what do they say?
Does the uart become hot when you connect it to usb? Make sure it doesn't touch the metal frame of the N2.
N2 is shut down(power led off) as soon as I connect the usb cable to my mac, so I cannot see any messages from screen. The tty serial device doesn’t appear in /dev directory.

Yes, uart becomes hot when I connect it to the usb port.

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Sun Apr 07, 2019 10:31 pm

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Re: odroid-n2 shutdown with usb-uart

Unread post by mad_ady » Sun Apr 07, 2019 10:45 pm

Ok, stop connecting it to the N2 and wait for @odroid's advice - lately there have been reports of overheating uarts. Might be something wrong with a recent batch...

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Mon Apr 08, 2019 4:52 am

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Mon Apr 08, 2019 5:28 am

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Re: odroid-n2 shutdown with usb-uart

Unread post by textkiller » Mon Apr 08, 2019 7:43 am

phaseshifter wrote:
Mon Apr 08, 2019 5:28 am
if your data 4 wire cable has been fitted backwards and you have used the uart kit ...
it is now most likely the uart is damaged and changing the cable 4 wire cable direction ...will prolly not work..as the uart is now damaged...

this is my 20 cent`s worth...
I can’t connect it upside down because of the connector shape.

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Mon Apr 08, 2019 7:57 am

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Mon Apr 08, 2019 7:58 am

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Re: odroid-n2 shutdown with usb-uart

Unread post by odroid » Mon Apr 08, 2019 9:07 am

textkiller wrote:
Sun Apr 07, 2019 8:31 pm
mad_ady wrote:
Sat Apr 06, 2019 11:08 pm
So - you're connecting to the uart port on the N2, right?
If you attach to the serial port with screen from your MAC and power on the N2 do you get any messages/blue led blinking on the uart adapter? If you do, what do they say?
Does the uart become hot when you connect it to usb? Make sure it doesn't touch the metal frame of the N2.
N2 is shut down(power led off) as soon as I connect the usb cable to my mac, so I cannot see any messages from screen. The tty serial device doesn’t appear in /dev directory.

Yes, uart becomes hot when I connect it to the usb port.

Your USB-UART seems to be damaged.
Contact "odroid at hardkernel dot com" with a link of this post.
She will help your RMA process if you purchased the board from us directly.
Otherwise, contact your local distributor/reseller.

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Re: odroid-n2 shutdown with usb-uart

Unread post by mad_ady » Mon Apr 08, 2019 3:43 pm

@phaseshifter: my USB-UART connector is keyed and doesn't fit the other way around. I had a look. I have rev 0.2 2012.06.29 of the UART board.

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Re: odroid-n2 shutdown with usb-uart

Unread post by phaseshifter » Mon Apr 08, 2019 4:37 pm

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Re: odroid-n2 shutdown with usb-uart

Unread post by tobetter » Mon Apr 08, 2019 6:30 pm

@phaseshifter, please find the right connection of the USB-UART board. The wire must be connected the other way but it should work.
IMG_20190408_1826256.jpg
IMG_20190408_1826256.jpg (484.5 KiB) Viewed 225 times

textkiller
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Re: odroid-n2 shutdown with usb-uart

Unread post by textkiller » Tue Apr 16, 2019 10:46 pm

odroid wrote:
Mon Apr 08, 2019 9:07 am
textkiller wrote:
Sun Apr 07, 2019 8:31 pm
mad_ady wrote:
Sat Apr 06, 2019 11:08 pm
So - you're connecting to the uart port on the N2, right?
If you attach to the serial port with screen from your MAC and power on the N2 do you get any messages/blue led blinking on the uart adapter? If you do, what do they say?
Does the uart become hot when you connect it to usb? Make sure it doesn't touch the metal frame of the N2.
N2 is shut down(power led off) as soon as I connect the usb cable to my mac, so I cannot see any messages from screen. The tty serial device doesn’t appear in /dev directory.

Yes, uart becomes hot when I connect it to the usb port.

Your USB-UART seems to be damaged.
Contact "odroid at hardkernel dot com" with a link of this post.
She will help your RMA process if you purchased the board from us directly.
Otherwise, contact your local distributor/reseller.
I received a new one today.
It seems to be work well. :D

Thanks.

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