Prepare

Before everything We assume that you have a Devterm with stock os running
and a little bit of Linux compiling experience
know how to install packages by package manager like apt

WiringPi

CM3 or CM4

sudo apt install -y wiringpi libwiringpi-dev libcups2-dev 

A06 A04

git clone https://github.com/clockworkpi/DevTerm.git
cd DevTerm/Code/devterm_wiringpi_cpi/
sudo ./build
#chose 0 or 1 depend which board you have

R01

git clone https://github.com/clockworkpi/DevTerm.git
wget https://github.com/WiringPi/WiringPi/archive/refs/tags/final_official_2.50.tar.gz
tar zxvf final_official_2.50.tar.gz 
cd WiringPi-final_official_2.50/
cp ../DevTerm/Code/patch/d1/wiringCP0329.patch .
git apply wiringCP0329.patch
sudo ./build
#Choice: 2

Compile thermal printer driver code

git clone https://github.com/clockworkpi/DevTerm.git
cd DevTerm/Code/thermal_printer
make  
sudo systemctl stop devterm-printer   
sudo cp -rf devterm_thermal_printer.elf /usr/local/bin  
sudo systemctl start devterm-printer 

Debug or run it from manually

1. setup socat socket for data receving for thermal printer

   sudo systemctl stop devterm-printer #stop service
   sudo systemctl stop devterm-socat   #stop service
   sudo socat -d -d pty,link=/tmp/DEVTERM_PRINTER_OUT,raw,echo=0 pty,link=/tmp/DEVTERM_PRINTER_IN,raw,echo=0
   sudo ./usr/local/bin/devterm_socat.sh # <- this .sh file is in DevTerm/Code/thermal_printer/usr/local/bin/

1. run devterm_thermal_printer.elf

   sudo ./devterm_thermal_printer.elf

now you can test the printer by cat or echo something into /tmp/DEVTERM_PRINTER_IN
eg: `echo "hello world\n\n\n\n\n\n\n\n\n\n" > /tmp/DEVTERM_PRINTER_IN

we recommend use tmux to do this job
so that you can run and see all the commands output in a single terminal window

For CUPS

just install devterm-thermal-printer-cups
sudo apt install devterm-thermal-printer-cups

this package will add a CUPS serial printer adapter,a CUPS filter for the DevTerm's thermal printer
and will let other programs to print content through image printing using DevTerm's thermal printer
source code is in https://github.com/clockworkpi/DevTerm/tree/main/Code/devterm_thermal_printer_cups

all devterm related deb packages available at

https://github.com/clockworkpi/apt