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Understanding VL-GM2-AGX-8CAM Adaptor with Jetson AGX Orin

Overview​

This article mainly describes the status of the VL-GM2-AGX-8CAM adaptor and how to use the additional 20-pin connector.

LEDs​

The VL-GM2-AGX-8CAM adaptor has four LED indicators, as shown in picture below. All green LEDs are the lock indicator lights for the four Deserializers, respectively.

Power Selector​

The VL-GM2-AGX-8CAM adaptor can support multiple input power, accepting 12V from the DC jack or 5V from the additional pin connector.

warning

The 5V input power supply only supports a maximum current of 2A. If you want to connect multiple or eight VLS-GM2 cameras, we still recommend using a 12V input power supply.

Additional 20 Pin Connector​

When using TechNexion VL-GM2-AGX-8CAM adaptor, it has an additional 20 pin connector that can be connected to the 40 pin connector of the Jetson AGX Orin.

How to connect to AGX Orin​

Adaptor [Pin Num]AGX Orin [Pin Num]
5V [2]5V [2]
5V [4]5V [4]
GND [6]GND [6]
GND [9]GND [9]
GND [14]GND [14]
EXT_SYNC_IN [19]GPIO12(PWM) [15]
GND [20]GND [20]

In the adaptor, EXT_SYNC_IN is the deserializer's external frame sync signal pin, which can be used with the fsync-external device tree. Users can input a PWM signal to synchronize the four deserializers.

External Frame Sync Singal​

The pin number 15 is PWM0 on the 40 pin connector of the Jetson AGX Orin.
You can use the following shell script to set PWM0 to a 30Hz signal with a 50% duty cycle.

echo 0 > /sys/class/pwm/pwmchip0/export
sleep 0.1
echo 33333333 > /sys/class/pwm/pwmchip0/pwm0/period
echo 16666666 > /sys/class/pwm/pwmchip0/pwm0/duty_cycle
sleep 0.1
echo 1 > /sys/class/pwm/pwmchip0/pwm0/enable

Troubleshooting​

  • Host MIPI CSI-2 can't get image from GMSL2

    You can use I2C commands to reset the serializer MIPI channel data to ensure MIPI data alignment. The example is as follows.

    I2CBUS_0=9
    SER_0=0x41
    SER_1=0x42

    echo '[   INFO ] Reset serializer index 0 to 1 mipi rx'
    i2ctransfer -f -y $I2CBUS_0 w3@$SER_0 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_0 w3@$SER_1 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_0 w3@$SER_0 0x03 0x30 0x40
    i2ctransfer -f -y $I2CBUS_0 w3@$SER_1 0x03 0x30 0x40

    I2CBUS_1=10
    SER_2=0x41
    SER_3=0x42

    echo '[   INFO ] Reset serializer index 2 to 3 mipi rx'
    i2ctransfer -f -y $I2CBUS_1 w3@$SER_2 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_1 w3@$SER_3 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_1 w3@$SER_2 0x03 0x30 0x40
    i2ctransfer -f -y $I2CBUS_1 w3@$SER_3 0x03 0x30 0x40

    I2CBUS_2=11
    SER_4=0x41
    SER_5=0x42

    echo '[   INFO ] Reset serializer index 4 to 5 mipi rx'
    i2ctransfer -f -y $I2CBUS_2 w3@$SER_4 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_2 w3@$SER_5 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_2 w3@$SER_4 0x03 0x30 0x40
    i2ctransfer -f -y $I2CBUS_2 w3@$SER_5 0x03 0x30 0x40

    I2CBUS_3=12
    SER_6=0x41
    SER_7=0x42

    echo '[   INFO ] Reset serializer index 6 to 7 mipi rx'
    i2ctransfer -f -y $I2CBUS_3 w3@$SER_6 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_3 w3@$SER_7 0x03 0x30 0x48
    i2ctransfer -f -y $I2CBUS_3 w3@$SER_6 0x03 0x30 0x40
    i2ctransfer -f -y $I2CBUS_3 w3@$SER_7 0x03 0x30 0x40