Camera Control

This section describes how to run the camera input selection demo script for the PAL–MIPI CSI-2 Bridge Board. The below control script communicates with the board over I2C to dynamically select between the three composite video inputs during live streaming.

Download the Control Script

In Host PC, download the control_pal_mipi.py script file from the download link below and copy it to the Jetson Orin Super Developer Kit:

Download Link: control_pal_mipi.py

Note:

If file is not able to download, go through Full Script section below.

Install Dependencies on Developer Kit

Before running the script, install the required Python libraries on the Developer Kit. Open a terminal and run the following commands:

Update Package List

sudo apt update

Install pip3

sudo apt install python3-pip

Dependency 1 — smbus2

pip3 install smbus2    # for i2c communication

Run the Control Script

Once the dependencies are installed, navigate to the directory where the script was copied and execute it using Python3 in terminal

python3 control_pal_mipi.py

The script communicates with the bridge board over I2C to select between the three composite video inputs. The board supports dynamic input switching via I²C from the host processor, eliminating the need for external switching hardware.

Script Overview

Full Script

import smbus2
import time
 
bus = smbus2.SMBus(9)
I2C_ADDR = 0x48  # Bridge board I2C address
 
def write_reg(reg, data):
    bus.write_byte_data(I2C_ADDR, reg, data)
 
def select_input(channel):
    # channel: 0, 1, or 2 for composite inputs 1, 2, or 3
    write_reg(0x00, channel & 0x03)
 
# Select input 0 (composite channel 1)
select_input(0)
time.sleep(2)
 
# Select input 1 (composite channel 2)
select_input(1)
time.sleep(2)
 
# Select input 2 (composite channel 3)
select_input(2)
time.sleep(2)