Connecting to the Odroid HC4 via UART
=====================================
date: 2021-12-30
In the process of trying to flash OpenBSD on my Odroid HC4 (still
not achieved.. but the FAQ says the chip is supported...), I
needed to connect via the serial console.
The board has a UART Console with the following pins:
_____UART____
|Pin 4 - GND|
|Pin 3 - RXD|
|Pin 2 - TXD|
|Pin 1 - VCC|
\___________|
CON5
3.3V LVTTL
-> Source:
https://wiki.odroid.com/odroid-hc4/hardware/hardware
And I have a USB to Serial with the following wires (your colors
may vary!):
--red----[VCC]
--green--[RXD]
--white--[TXD]
--black--[GND]
To the best of my research, these stand for:
- VCC: power
- RXD: receive
- TXD: transmit
- GND: ground
I had success connecting _without the power_, hooking up only
GND, RXD, and TXD.
The connectors on my serial are a bit too large, too, so I had to
turn them diagonal so the squares would fit in the notches, but
it worked!
On OpenBSD (host OS), I was able to connect like so:
$ doas cu -l cuaU1 -s 115200
(cuaU1 is the serial USB device--not 0 on my machine since my
motherboard has its own serial out that takes up cuaU0).