Setup Serial Debugging Tool

Edge-V

You won’t need an Edge-IO board to setup the serial debugger on an Edge-V. Just use the on-board GPIO pins, as shown in this picture (same as VIM1, VIM2, and VIM3).

VIM1-GPIO

Edge

If you’re using an Edge SBC, continue reading below:

Preparation

  • A Serial Debugging Tool. In this guide, we will use a USB to TTL Converter. Ensure that it supports the 1500000 baudrate.
  • Edge needs the Edge-IO breakout-board to support serial debugging.

Connections

Follow these steps to make the correct connections:

  1. Connect Edge-IO board to Edge via the FPC connector.
    Edge IO FPC

  2. Connect all the GPIOs, and check that the Tx / Rx Pins are connected correctly:

  • Tool Pin GND: <—> Edge IO GND
  • Tool Pin TXD: <—> Edge IO RXD
  • Tool Pin RXD: <—> Edge IO TXD

The connections should look like this:

Image of SerialConnections

  1. Insert the USB-end into your Host-PC.

Setup Kermit Protocol (C-Kermit)

Install c-kermit:

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$ sudo apt-get install ckermit

Add Access Permission

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$ sudo usermod -a -G dialout $(whoami)

Add the following contents into ~/.kermrc to finish the setup:

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set line /dev/ttyUSB0
set speed 1500000
set carrier-watch off
set handshake none
set flow-control none
robust
set file type bin
set file name lit
set rec pack 1000
set send pack 1000
set window 5
c

Enable 1500000 baudrate

To enable 1500000 baudrate, you need to replace the kermit binary. See Khadas Kermit to download, and execute the following commands:

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$ chmod +x kermit
$ sudo cp kermit /usr/bin/kermit

Run the command kermit to launch C-Kermit

Ensure that you have made the right connections, and if everything went fine, terminal will print this out:

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$ kermit
Connecting to /dev/ttyUSB0, speed 1500000
 Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------
GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0;
TE: 116640

...

Tip

If the print-out contains the following line, you might need to check the step Add Access Permission above.

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/dev/ttyUSB0: Permission denied

SecureCRT Bug

If you use SecureCRT to connect the Edge-V or edge,maybe you will see this.
SrcureCRT BUG
This is not caused by incorrect settings. This is a CRT bug. You need to follow my steps.

  • Use kermit to connect you board,you will see the true log
  • Close kermit,then use SecureCRT to connect you board.you will find all is fine.
    SecureCRT Slove
Note

If these steps don’t work, maybe you need to confirm your settings first.

See Also

Next