Revision as of 04:10, 22 October 2021

USB2UART Bridge

There are plenty types of usb to uart bridge in the market . Most of them use the following chip :

• CP210X
• PL2303
• CH340

Hardware PIN define

RSB4680 debug port pin define : 

Note : 

Please connect device's TX to usb2uart adapter's RX and device's RX to usb2uart adapter's TX .

UART parameter

• BaudRate：115200
• DataBits  ：8
• StopBits  ：1
• Parity      ：None
• FlowControl：None or XON/XOFF

Debug on windows

Install usb2uart adapter's driver. Connect adapter to PC , you will find COM port like :

Putty is very populate tool on Windows. Download putty here.

Run PUTTY.exe, select Connection type of "Serial" , input COM port found in Device Manager.

Set Parameter like :

Then Click "Open" to start debug console.

Debug on Ubuntu

"Kermit" and "MiniCom" are very famous tools on Ubuntu.

 Connect adapter to PC , find COM port :

$ ls /dev/ttyUSB*
/dev/ttyUSB0

Kermit

Install Kermit : 

sudo apt-get update
sudo apt-get install ckermit

Config Kermit : 

vi $HOME/.kermrc;

Input the following content : 

set line /dev/ttyUSB0
set speed 115200
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

Note : 

Change "/dev/ttyUSB0" according your system, Use Command "ls /dev/ttyUSB*" .

Run kermit

sudo kermit

MiniCom

Install MiniCom: 

sudo apt-get update
sudo apt-get install minicom

Run kermit

$ sudo minicom
Welcome to minicom 2.7                                       
OPTIONS: I18n       
Compiled on Jan  1 2014, 17:13:19.     
Port /dev/ttyUSB0, 15:57:00                                 
Press CTRL-A Z for help on special keys

According the tips, press CTRL-A, then press Z to show help.

  +-------------------------------------------------------------------+
                          Minicom Command Summary                      |
  |                                                                    |
  |              Commands can be called by CTRL-A <key>                |
  |                                                                    |
  |               Main Functions                  Other Functions      |
  |                                                                    |
  | Dialing directory..D  run script (Go)....G | Clear Screen.......C  |
  | Send files.........S  Receive files......R | cOnfigure Minicom..O  |
  | comm Parameters....P  Add linefeed.......A | Suspend minicom....J  |
  | Capture on/off.....L  Hangup.............H | eXit and reset.....X  |
  | send break.........F  initialize Modem...M | Quit with no reset.Q  |
  | Terminal settings..T  run Kermit.........K | Cursor key mode....I  |
  | lineWrap on/off....W  local Echo on/off..E | Help screen........Z  |
  | Paste file.........Y  Timestamp toggle...N | scroll Back........B  |
  | Add Carriage Ret...U                                               |
  |                                                                    |
  |             Select function or press Enter for none.               |
  +--------------------------------------------------------------------+

According the tips, press O to show configuration.

 +-----[configuration]------+  
           | Filenames and paths      |   
           | File transfer protocols  |   
           | Serial port setup        |  
           | Modem and dialing        |  
           | Screen and keyboard      | 
           | Save setup as dfl        | 
           | Save setup as..          |                 
           | Exit                     |                 
           +--------------------------+

Press "↓"， move cursor to "Serial port setup" to Config parameter.

Then press "A"-"G" to set relative content as following :

 +-----------------------------------------------------------------------+                                          
   | A -    Serial Device      : /dev/ttyUSB0                              |                                          
   | B - Lockfile Location     : /var/lock                                 |                                          
   | C -   Callin Program      :                                           |                                          
   | D -  Callout Program      :                                           |                                          
   | E -    Bps/Par/Bits       : 115200 8N1                                |                                          
   | F - Hardware Flow Control : No                                        |                                          
   | G - Software Flow Control : No                                        |                                          
   |                                                                       |                                          
   |    Change which setting?                                              |                                          
   +-----------------------------------------------------------------------+

When configuration is done, back to choose "Save setup as dfl" to save as default configuration.