I bought the that is mentioned in Setup Serial Tool to use with the Edge-V, but the adapter comes with no instructions and the Khadas documentation doesn’t tell me which pins on the Edge-V I am supposed to connect to. Please help.
Hello @Melab
It is on the gpio header, please check here: Edge1 Hardware Documentation [Khadas Docs]
Are RXD, TXD, and GND the only pins I need to use? Do I match the GND pin on the Edge-V to the GND pin on the USB-TTL adapter board, RXD to RXD, and so forth? What about VCC? Do I use the 3.3V pin on the adapter board? The 5V pin?
I have gone ahead and connected the pins. After following minicom setup instructions and rebooting the device, I cannot see any serial output while in minicom. How do I do this?
Yes.
- BOARD GND <-> USB-TTL adapter GND
- BOARD TXD <-> USB-TTL adapter RX
- BOARD RXD <-> USB-TTL adapter TX
VCC is optional, you can leave it o disconnected or connected it to 3.3V or 5.0V depends on your USB-TTL adapter.
Please make sure you have setup minicom correctly.
- Choose the correct serial devices, if you only have one USB-TTL adapter, it shuould be
/dev/ttyUSB0 - Setup correct baudrate - 1500000
- Setup no Hardware Flow Control
It shuld be like this:
Welcome to minicom 2.8
OPTI+-----------------------------------------------------------------------+
Port| A - Serial Device : /dev/ttyUSB0 |
| B - Lockfile Location : /var/lock |
Pres| C - Callin Program : |
| D - Callout Program : |
| E - Bps/Par/Bits : 1500000 8N1 |
| F - Hardware Flow Control : No |
| G - Software Flow Control : No |
| H - RS485 Enable : No |
| I - RS485 Rts On Send : No |
| J - RS485 Rts After Send : No |
| K - RS485 Rx During Tx : No |
| L - RS485 Terminate Bus : No |
| M - RS485 Delay Rts Before: 0 |
| N - RS485 Delay Rts After : 0 |
| |
| Change which setting? |
+-----------------------------------------------------------------------+
The correct baud rate is 1500000 and not 115200? 1500000 is not available.
I am getting output now, but it’s mostly garbage until I get to the Ubuntu login screen. Sometimes there is a BL31 message mixed in.
I want to be interacting with Ubuntu though, not Ubuntu. The steps to get to the U-Boot menu (resetting and pressing SPACE, or, booting into SD card and pressing SPACE) just outputs garbage that then doesn’t present me with printable characters.
Yes, must be 1500000.
What’s the baudrate you set?
I was given a menu of possible settings and that was not one of the options. Is there a way to set it to a custom rate?
It’s set to 115200 8IN1.
What’s the system you used? If minicom doesn’t work for you, you can also try screen command.
sudo screen /dev/ttyUSB0 1500000
No, must be 1500000 8IN1
Does the baud rate have some connection to character decoding?
Ubuntu 20.04 on a PC.
I’ve set it back up again and tried minicom before screen to see if output is working again, but I’m getting nothing.
I did figure out how to set the baud rate to 1500000 on minicom afterwards though trying it again still displayed no output.