K230 Inter Processer Communication Sharefs Usage#
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overview#
ShareFs provides large cores with access to the small kernel file system through access to the respective /sharefs directories of large and small cores. In actual use, the executable programs of the big core are usually stored in the /sharefs directory, and the big core executes these programs through the sharefs function to facilitate the development and debugging of applications on the big core.
Environment preparation#
Hardware environment#
K230-USIP-LP3-EVB-V1.0/K230-UNSIP-LP3-EVB-V1.1
Software environment#
k230_SDK
use#
File creation, write, view#
Under the msh command line of RT-Smart, you can create a file in /sharefs via echo.
msh /sharefs>echo "hello wrold" hello.txt
In the shell terminal of small-core Linux, the contents of this file can be viewed in /sharefs
[root@canaan ~ ]#cd /sharefs/
[root@canaan /sharefs ]#cat hello.txt
hello wrold[root@canaan /sharefs ]#
Folder creation#
Under the msh command line of the big core rt-smart, create a directory through mkdir
msh /sharefs>mkdir test
In the Linux shell of the little core, use ls to view the newly added directories
[root@canaan /sharefs ]#ls
System Volume Information hello.txt test
File read#
In the shell of small-core Linux, create a file via echo
[root@canaan /sharefs ]#echo "hello world this is linux" >> linux.txt
Under the msh command line of the large-core RT-SMART, use CAT to view the file contents
msh /sharefs>cat linux.txt
hello world this is linux
File loading#
Copy the compiled rt-smart user-mode executable elf file to the /sharefs directory of the little core, and then execute it through the msh command line of the large kernel rt-smart
msh /sharefs>./hello.elf
Hello world
File deletion#
Under the msh command line of the big core rt-smart, use rm to delete the file
msh /sharefs>ls
Directory /sharefs:
. <DIR>
.. <DIR>
System Volume Information<DIR>
hello.txt 11
linux.txt 26
msh /sharefs>rm hello.txt
msh /sharefs>rm linux.txt
msh /sharefs>ls
Directory /sharefs:
. <DIR>
.. <DIR>
System Volume Information<DIR>
msh /sharefs>
In the shell of the small kernel Linux, use ls to see the removal results
[root@canaan /sharefs ]#ls
System Volume Information
other#
ShareFS supports most POSIX file interface operations on RT-Smart, including:
open
close
ioctl
read
write
flush
lseek
state
statfs
OpenDir
rewinddir
mkdir
rmdir
rename
Interested readers can write their own file IO read and write related test code experience
Notes#
ShareFS is not suitable for scenarios where high-frequency real-time reads and writes, such as encoding and saving
Files created by large cores under sharefs, read and write executable permissions on linux are present
sharefs is not suitable for multi-process use, that is, avoid starting multiple processes on the big core to read and write files in the /sharefs directory at the same time