USB TTL cable no longer working
#1
My serial cable no longer works. It used to work.

I connect it to the Euler connector,


Quote:TX: pin 29
RX: pin 30
GND: pin 34


Then on Linux, 

Code:
cu -l /dev/ttyUSB0 -s 115200

I do not get any response from "cu".
I tried two such cables. Is it possible that the cables got damaged? What can done to deal with this?
Initially I was worried that I bricked the board. However, I managed to boot an image off the microSD card, that had HDMI output.
#2
Have you tried the UART pins on the EXP port? I guess everything is wired to same place, but maybe there is some issue with a a connector.
#3
(03-09-2016, 12:09 PM)janjwerner Wrote: Have you tried the UART pins on the EXP port? I guess everything is wired to same place, but maybe there is some issue with a a connector.

Better use EXP port for UART console cable. The Euler port UART pin has voltage shifter and Euler port do not.
#4
(03-09-2016, 01:36 PM)tllim Wrote:
(03-09-2016, 12:09 PM)janjwerner Wrote: Have you tried the UART pins on the EXP port? I guess everything is wired to same place, but maybe there is some issue with a a connector.

Better use EXP port for UART console cable. The Euler port UART pin has voltage shifter and Euler port do not.

According pinout there is possible to have 6 UARTS (I plan to test this once I have my PINE64 in hands together with modules based on MAX3232 chip from ebay).
https://drive.google.com/a/pine64.com/fi...sp=sharing

1 of UARTs is on PI bus. I'd try this.
pin6   - GND
pin8   - UART_TXD
pin10 - UART_RXD

But don't know what device file each UART will have.
Try check what device files are there containing "tty" under /dev .
#5
(03-09-2016, 02:45 PM)peterz Wrote:
(03-09-2016, 01:36 PM)tllim Wrote:
(03-09-2016, 12:09 PM)janjwerner Wrote: Have you tried the UART pins on the EXP port? I guess everything is wired to same place, but maybe there is some issue with a a connector.

Better use EXP port for UART console cable. The Euler port UART pin has voltage shifter and Euler port do not.

According pinout there is possible to have 6 UARTS (I plan to test this once I have my PINE64 in hands together with modules based on MAX3232 chip from ebay).
https://drive.google.com/a/pine64.com/fi...sp=sharing

1 of UARTs is on PI bus. I'd try this.
pin6   - GND
pin8   - UART_TXD
pin10 - UART_RXD

But don't know what device file each UART will have.
Try check what device files are there containing "tty" under /dev .
Combine both Euler and Pi2 bus, the maximum available UART is 4.
#6
[quote pid='3287' dateline='1457557488']
Combine both Euler and Pi2 bus, the maximum available UART is 4.
[/quote]

There is also EXP bus and Wifi/BT Connector (J50). I suppose those would work as well (I won't use wifi/BT modul).
#7
(03-09-2016, 03:09 PM)peterz Wrote: [quote pid='3287' dateline='1457557488']
Combine both Euler and Pi2 bus, the maximum available UART is 4.

There is also EXP bus and Wifi/BT Connector (J50). I suppose those would work as well (I won't use wifi/BT modul).
[/quote]

You plan to max out all UART ports :-)
#8
Thanks for the replies.

I use Ubuntu and the appropriate devices are autocreated in /dev/. The default is /dev/ttyUSB0.
I tried two different UART cables, both with the following characteristics,

Code:
[46297.049241] usb 1-9: new full-speed USB device number 4 using xhci_hcd
[46297.178108] usb 1-9: New USB device found, idVendor=067b, idProduct=2303
[46297.178116] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[46297.178121] usb 1-9: Product: USB-Serial Controller
[46297.178124] usb 1-9: Manufacturer: Prolific Technology Inc.
[46298.217991] usbcore: registered new interface driver usbserial
[46298.218005] usbcore: registered new interface driver usbserial_generic
[46298.218015] usbserial: USB Serial support registered for generic
[46298.219383] usbcore: registered new interface driver pl2303
[46298.219397] usbserial: USB Serial support registered for pl2303
[46298.219411] pl2303 1-9:1.0: pl2303 converter detected
[46298.220266] usb 1-9: pl2303 converter now attached to ttyUSB0

I tried both the PINs 6/8/10 (GND, TX, RX) on the Euler connector and also PINs 6/7/8 (GND, TX, RX) on the Exp connector. 
I did not get any response at speed 115200.
I cannot figure out what changed so that now I do not get any output from the serial cable.
If a solution is found, I will document the whole process on the wiki!
#9
I dont know anything but try to switch rx and tx?
#10
(03-09-2016, 04:40 PM)longsleep Wrote: I dont know anything but try to switch rx and tx?

My suggestion same as longsleep.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Found this fully working RASPBIAN Image that boots to desktop speedro86 21 13,053 10-07-2017, 10:06 PM
Last Post: speedro86
  How to make multicast working on ubuntu and debian brengthdom 3 3,979 09-18-2016, 02:05 PM
Last Post: brengthdom
  Arch working! c0psrul3 1 1,593 05-01-2016, 08:55 PM
Last Post: Leoncito81
  Actual "working" 64 bit distro UnixOutlaw 2 2,935 03-16-2016, 02:25 PM
Last Post: umiddelb

Forum Jump:


Users browsing this thread: 1 Guest(s)