ymodem YMODEM

This is ymodem protocol. According to it, the sb rb application is realized, which is used to send files and receive files respectively

Usage

Common Usage

In the ubuntu system, lszrz needs to be installed, can use sudo apt install lszrz. Use minicom to communicate with the board.

Advanced Usage

In order to achieve a faster transmission speed, I added a specific HEADER STC to the YMODEM protocol to represent the custom length. Using the sb and rb commands on the board, you can use the -k option to set the length of the custom packet, and the unit is KB. Therefore, you need to use sbrb.py for file transfer, and you need sbrb.py -k to set the same length as the board. According to my test, when using -k 32, it can reach 93% of the baud rate, and is fully compatible with the original ymodem protocol. First, you need to add a soft link to sbrb.py, for example sudo ln -s /home/<name>/.../<nuttxwork>/apps/system/ymodem/sbrb.py /usr/bin and then sbrb.py can be configured into minicom.<Ctrl + a> z o then chose File transfer protocols and create two option cmd is 'sbrb.py -k 32'. like this

Name	Program	Name	U/D	FullScr	IO-Red.	Multi
ymodem-k	sbrb.py -k 32	Y	U	N	Y	Y
ymodem-k	sbrb.py -k 32	N	D	N	Y	Y

usb sb -k 32 or rb -k 32 for file transfer on board.

Sendfile to pc

use sb command like this nsh> sb /tmp/test.c ..., this command support send multiple files together then use <Ctrl + a> , r chose ymodem to receive board file.

Sendfile to board

use rb cmd like this nsh> rb, this command support receive multiple files together then use <Ctrl + a> , s chose ymodem, then chose what file need to send.

help

can use sb -h or rb -h get help.

Debug

Because the serial port is used for communication, the log is printed to the debug file you can use CONFIG_SYSTEM_YMODEM_DEBUGFILE_PATH set debug file path.