CSI

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

Note: A single camera can only be connected to MIPI0.
Note: The CSI interface is disabled by default and requires configuration in the config.txt file before use.

CSI Interface Selection - Driver Settings

• Enable the CSI interface (disabled by default)

• Edit the config.txt file

  sudo nano /boot/firmware/config.txt 

• Add the appropriate configuration to config.txt based on the camera model used (examples below use the imx219 driver for cameras):

  Camera Driver Model	CAM0 Setting Statement	CAM1 Setting Statement
  OV9281	dtoverlay=ov9281,cam0	dtoverlay=ov9281,cam1
  IMX290/IMX327	dtoverlay=imx290,clock-frequency=37125000,cam0	dtoverlay=imx290,clock-frequency=37125000,cam1
  IMX378	dtoverlay=imx378,cam0	dtoverlay=imx378,cam1
  IMX219	dtoverlay=imx219,cam0	dtoverlay=imx219,cam1
  IMX477	dtoverlay=imx477,cam0	dtoverlay=imx477,cam1
  IMX296	dtoverlay=imx296,cam0	dtoverlay=imx296,cam1
  IMX708	dtoverlay=imx708,cam0	dtoverlay=imx708,cam1

• To use only CSI0 (MIPI0), add the following line:

  # CSI0 (MIPI0)
  dtoverlay=imx219,cam0               

• To use only CSI1 (MIPI1), add the following line:

  # CSI1 (MIPI1)
  dtoverlay=imx219,cam1               

• To use both CSI0 (MIPI0) and CSI1 (MIPI1) simultaneously, add following lines:

  # CSI0 (MIPI0) and CSI1 (MIPI1)
  dtoverlay=imx219,cam0               
  dtoverlay=imx219,cam1               

• After modification, restart the Raspberry Pi to use the CSI interface to drive the camera normally:

  sudo reboot

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Camera Detection

• If the CSI interface is not enabled, enable the CSI interface first (Note: The driver settings must match the camera used)
• Use the following command to detect connected cameras:

  rpicam-hello --list-cameras

• Open the corresponding camera:

  # Open camera 0
  rpicam-hello --camera 0 -t 0  

  # Open camera 1  
  rpicam-hello --camera 1 -t 0    

• If the camera is detected but fails to start, try updating the system:

  sudo rpi-update

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Displaying Real-time Preview

• If the CSI interface is not enabled, enable the CSI interface first (Note: The driver settings must match the camera used)
• Display the camera preview on the desktop (Note: This command cannot be used over an SSH connection):

  rpicam-hello -t 0

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Taking a Photo

• If the CSI interface is not enabled, enable the CSI interface first (Note: The driver settings must match the camera used)
• Take a photo and save it to the current directory:

  rpicam-jpeg -o test.jpg

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Recording a Video

• If the CSI interface is not enabled, enable the CSI interface first (Note: The driver settings must match the camera used)
• Record a 10-second video and save it to the current directory:

  rpicam-vid -t 10s -o test.h264

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