Description

• A basic Pseudo Character Device Driver with 4 devices that support read, write, open, release and lseek operations.
• Linux - ubuntu
• Kernel - 6.11.0-19-generic
• Cross compiler - gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabih

Init

• Please edit the make file based on your system. when in the repo use below command to remove all the make files
• $ make clean
• Once done you can use $ make host
• Then use $ sudo insmod .ko in this case its pcd_n.ko
• You can check the devices using $ ls -l /dev/pcdev- + tab

Operations

• In this case the first device is RDONLY, second device is WRONLY, third and fourth devices are RDWR
• you can use various different commands to test the supported operations
• the ones i used:
• Read - cat /dev/pcdev-3 , dd if=/dev/pcdev-3 of=file.txt count=1 bs=100
• Write - echo, dd if=pcd_n.c of=/dev/pcdev-3 count=1 bs=100
• Lseek - used the dev_read.c to check the SEEK_SET, SEEK_CUR, SEEK_END

Credits

• This project was part of Fastbit Embedded Brain Academy course on Udemy