It's very Hard to Remember how to compile Fucking Pos Driver for Raspberry Pi. So i write all steps here for you. maybe when you want to install it the version of Rasbian changed! don't worry update your raspberry and enjoy!

1. sudo apt-get update
2. sudo apt-get dist-upgrade
3. uname -a

I attached C files of the driver so clone them:

1. git clone https://github.com/Mohammadpch/pos
2. Extract Linux Driver_ttyPos V314.zip
3. cd ttyPos_V314_20170802
4. make

you see this Error: make[1]: *** /lib/modules/4.14.50-v7 /build: No such file or directory. Stop. Makefile:9: recipe for target 'all' failed make: *** [all] Error 2 Don't worry you read these to solve these fucking problem.

1. cd /usr/src
2. git clone --depth 1 https://github.com/raspberrypi/linux.git
   
3. ln -s linux linux-4..18-v7
4. ln -s /usr/src/linux /lib/modules/4.1.18-v7 /build

Now Go to C files and Make adn install them.

1. Cd ttyPos_V314_20170802
2. sudo make
3. sudo make install

1. lsmod
2. try to find ttPos :)

if it's not inserted insert it manually:

1. cd /lib/modules/4.14.62-v7 /ttPos
2. insmod ttyPos.ko
3. and Check E2 again.

Good Luck