CAN

This section introduces how to use the CAN interface function on the Raspberry Pi, laying the foundation for subsequent project development.

Enabling Interface Configuration

To use CAN, add the following lines:

dtoverlay=spi1-1cs
dtoverlay=mcp2515,spi1-0,oscillator=16000000,interrupt=17

After modification, reboot the Raspberry Pi to use the CAN driver normally:
```
sudo reboot
```
After reboot, use the following command to check the relevant ports; you should see a CAN port:
```
ifconfig
```
- If the CAN port is DOWN, bring it up (here the device is identified as can0, so the command uses can0; the final 500000 parameter is the CAN bus baud rate in bit/s):
```
sudo ip link set can0 up type can bitrate 500000
```
You can also check the relevant devices in the SPI subsystem:
```
dmesg | grep spi
```

Install tools:

sudo apt update
sudo apt-get install can-utils

Send data using cansend (send 0x11 0x22 0x33 0x44; here the hardware is identified as can0, so the command uses can0):
```
cansend can0 000#11.22.33.44
```
Listen for CAN data frames using candump (here the device is identified as can0, so the command uses can0):
```
candump can0
```