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This article is about how to install and configure ckermit tools. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Kermit File Transport Protocol is a simple file transport protocol used to exchange files between PC. It was developed by Columbia University and named after Kermit the Frog. It provides a way to download files from a large computer to a microcomputer. It has been used for public data transmission.

Kermit file transport protocol is a half-duplex communication protocol.

It supports 7-bit ASCII characters

Data is transmitted in packets of variable length up to 96 bytes in length

An acknowledgement is required for each packet that is transmitted

Multiple files can be transferred in each session

Easier to use than minicom

Kermit installation and configuration

Installation:

Apt-get install ckermit

Configuration:

Vi / etc/kermit/kermrc

The following are recommended configurations when using U-Boot and Linux

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

# add the above settings to "/ etc/kermit/kermrc"

# / dev/ttyUSB0 indicates that the development board is connected with usb to serial port. If only the serial port is used to connect the host, it needs to be set to / dev/ttyS0.

Start

-

Start kermit and connect the serial port:

# kermit

C-Kermit > connect

# now it has been successfully connected to the serial port.

Handover

-

Press Ctrl+\, then press c to jump back to kermit

C-Kermit >

At this point, type c, that is, connect, to connect to the serial port.

Send a file

-

After entering connect in kermit, it is transferred to the u-boot serial interface.

Enter loadb 0x00300000 to start the kermit protocol on the development board.

Press Ctrl +\, then press c to switch to kermit.

C-Kermit > send / home/share/uImage.pkg

Kermit starts the transfer and displays a transfer interface and dynamically displays the transfer progress.

After the transmission is finished, enter c, that is, the connect command, to return to the serial interface of u-boot.

Use the u-boot command to start the kernel.

When the download is finished, close the terminal window, reopen a terminal, and then kermit-c is using cp.b dest src len to copy the program into flash.

Speed comparison: kermit under Linux is much faster

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