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+# 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 through `apt` 
+
+
+## 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 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 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
+
+## 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
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