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# Raspberry pi CM3
### Enable SPI0
SPI0 is disabled by default. To enable it, use *raspi-config*, or ensure the line **dtparam=spi=on** isn't commented out in `/boot/config.txt`
add **dtoverlay=spi-gpio35-39** under **dtparam=spi=on**, then reboot
after reboot,make suer there is a `/dev/spidev0.0`
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wget -O - https://raw.githubusercontent.com/clockworkpi/apt/main/debian/KEY.gpg | sudo apt-key add -
echo "deb https://raw.githubusercontent.com/clockworkpi/apt/main/debian/ stable main" | sudo tee -a /etc/apt/sources.list.d/clockworkpi.list
sudo apt update
sudo apt install devterm-thermal-printer
### How to test
echo "this is a test" > /tmp/DEVTERM_PRINTER_IN