Uart

General
#1

Is there any chance you will produce a board with the UART debug header pre-populated? It would also helpful if you could sell a USB-serial cable compatible with this board.

For the BeagleBone and Raspberry Pi, you can easily pick up standard USB-serial cables from Adafruit, etc.

Thanks,
Arun

#2

It seems that you’re already working on this - I just stumbled across this in the CE specification:

In addition, for this community, CircuitCo Inc. plans to make available an initial low cost
maker mezzanine board that will provide the following functionality:

● I/O level shifters to 3.3V/5V
● 0.1” header for easy access to low speed expansion I/O at 3.3/5V levels
● Raspberry Pi compatible CSI camera FFC connector
● Arduino Uno compatible shield interface
● Standard UART connector interface

This board will connect to any 96Boards CE compliant board.

Is there a rough estimate of when the mezzanine board will be available?

Thanks,
Arun

#3

Talking of level shifters, has anybody been brave/stupid enough to try talking 3.3V to the board? Mine’s just sitting there while I wait for my level shifter to turn up in the post.

#4

So, I’ve soldered a header on and bought a 1.8V-ready USB/serial adaptor. But then I find that I can’t find the pinout for J16 anywhere in the schematics or docs. Mark Rutland has worked it out somehow so I came to the wiki to write it down and save others the bother, but it seems we don’t have a wiki, just a forum.

So not sure anyone will be able to find this post, but if you do, the key is:
1 VIO
2 TX
3 GND
4 RX
And in case your eyesight is as old as mine, 1 is NW/top left corner when the board has the connector (J16) to the NW/Top left corner. (A pic would be handy about now).

HTH

#5 
Hi all,
Is there anyone can make the board print information on the PC through UART when the Hikey board boot ?
#6

Turns out that the serial port pinout is in fact on page 7 of https://www.96boards.org/hikey-userguide

#7

The UART0 on J16 works for me… I dont have seperate monitor as of now… so connecting to my laptop console… But the issue is I get a autologin to root… Which I dont like… .Requesting one of the devs to help me disable this and login to my own user space (yes I can switch from root using su)… But I would love to have this auto root login gone… Any tips… Regular stuff like /etc/initab rc.conf were not found on device