Using with Raspberry Pi

Required Hardware

Development Kits

• AD-GMSLCAMRPI-ADP# GMSL EV Kit Adapter Board

• MAX96724 GMSL Deserializer Evaluation Kit

• MAX96717 GMSL Serializer Evaluation Kit or GMSL camera

• Raspberry Pi 4 Model B (2GB of RAM or more preferred)

Supported Image Sensors & Cameras

• IMX219 Raspberry Pi Camera Module 2

Cables

Warning

Do not use the 15-pin ribbon cable included with the Raspberry Pi camera since that is an opposite sided cable.

• 15-Pin Type A (same side) Flexible Ribbon Cable, P/N: MP-FFCA10152003A or similar

• 22-Pin Type B (opposite side) Flexible Ribbon Cable, P/N: MP-FFCA05222002B or similar

• FAKRA Jack to FAKRA Jack coaxial cable, provided in EV kits

Figure 1 GMSL Signal Chain

Board Modifications

Using the procedure to Set CFG Pin Levels, configure the SerDess pair as follows:

Pin	MAX96717	MAX96724
CFG0	0 – I2C, ROR, 0x80	0 – I2C, 0x4E
CFG1	7 – Coax, 6 Gbps, Pixel	0 – Coax, GMSL2, 6Gbps

Important

It is required to set the CFG pins to the indicated levels for this setup.

For more information about the default CFG configuration of each evaluation board, please visit the respective datasheet documentation:

• MAX98717EVKIT Data Sheet

• MAX98724EVKIT Data Sheet

GMSL Deserializer Evaluation Kit

• Slide the SW5 switches to the ON position to enable I2C communication over the CSI bus.

• Remove the J18 and J19 jumpers to allow the RPi to become the Main host controller for the I2C lines.

• Make sure the J3 is set as default 2-3 position to enable POC.

  

  Figure 2 SW5 Switch for Enabling I2C

• Bridge R88 - provides VDDIO to the adapter

  

  Figure 3 R88 for VDDIO Provision

GMSL Serializer Evaluation Kit

• Place a jumper on the J10 connector to enable power over the coaxial cable.

  

  Figure 4 J10 for Power over Coax

• Bridge R70 - provides 12V to the adapter

• Bridge R80 - connects MFP2 to the adapter for IMX219

• Bridge R66 - provides VDDIO to the adapter

  

  Figure 5 Serializer Resistors

AD-GMSLCAMRPI-ADP# Adapter

• Configure the switch S2 on the GMSL Serializer adapter for CAM1 on connector P9.

• Configure the switch S1 on the GMSL Deserializer adapter for CAM2 on connector P6 and slide switch S3 towards connector P6.

Serializer Adapter

Figure 6 Serializer Adapter Camera Switches

Deserializer Adapter

Figure 7 Deserializer Adapter Camera Switches

System Setup

MAX96717 Serializer EV Kit Configuration

For the following setup, please ensure ribbon cables and boards are oriented to match the diagrams.

Connect the 15-pin ribbon cable to the camera board.

Figure 8 Connect the 15-pin Ribbon Cable to Camera Board

Connect the other end of the 15-pin ribbon cable into the 15- to 22-pin adapter board.

Figure 9 Connect the 15-pin Ribbon Cable to the GMSL Adapter Board (opposite side)

On the other side of the 15- to 22-pin adapter board, connect the 22-pin ribbon cable.

Note

This is an opposite sided flex cable, please ensure it matches the orientation in the picture.

Figure 10 Connect the 22-pin Ribbon Cable to the GMSL Adapter Board

Connect the other end of the 22-pin ribbon cable into the EV Kit adapter board P9 connector.

Figure 11 Connect the 22-pin Ribbon Cable to the EV Kit Adapter Board (opposite side)

Lastly, connect the EV kit adapter board to the MAX96717 EV Kit.

Figure 12 Connect the EV Kit Adapter Board to the MAX96717 Serializer EV Kit

MAX96724 Deserializer EV Kit Configuration

Starting with the Raspberry Pi 4B, connect the 15-pin ribbon cable to the CSI input connector.

Figure 13 Connect the 15-pin Ribbon Cable to the Raspberry Pi

Connect the other end of the 15-pin ribbon cable into the 15- to 22-pin adapter board.

Figure 14 Connect the 15-pin ribbon cable into the GMSL Adapter Board (opposite side)

On the other side of the 15-to-22 pin adapter board, connect the 22-pin ribbon cable. Note: This is an opposite sided flex cable, please ensure it matches the orientation in the picture.

Figure 15 Connect the 22-pin Ribbon Cable to the GMSL Adapter Board

Connect the other end of the 22-pin ribbon cable into the EV kit adapter board P8 connector.

Figure 16 Connect the 22-pin Ribbon Cable to the EV Kit Adapter Board

Lastly, connect the EV kit adapter board to the MAX96724 EV kit.

Figure 17 Connect the EV Kit Adapter Board to the MAX96724 Deserializer EV Kit

With both sides of the SerDes devices connected up, the last step it to connect the two sides together with the coax cable. The MAX96717 serializer only has one connection. The MAX96724 deserializer has 4 inputs so connect the coax cable to link A (INA) on J7.

Figure 18 Full GMSL System Setup

Connect power to the 12V barrel jack J1 of the MAX96724 deserializer. If utilizing the GMSL GUI, also connect the micro USB cable to J6 of the MAX96724 deserializer EV kit.

Raspberry Pi 4 Configuration

• Connect the USB-C power supply to the Raspberry Pi 4 connector.

• Connect the HDMI cable from the monitor to the Raspberry Pi micro HDMI connector.

• Write the Raspberry Pi latest SD card image on a 8 GB (or more) SD card.

• Plug the SD card into the Raspberry Pi 4 SD card slot.

• Connect a USB mouse and keyboard to the Raspberry Pi 4. It’s possible to use either a mouse & keyboard combo or a separate mouse and keyboard.

Running the Evaluation Application

Once Linux boots, you’ll see on the HDMI monitor the Linux desktop and on the top left corner a shortcut to the script named video_cfg.sh. Double-clicking on the icon will start the media-ctl configuration script to connect to the V4L2 media pipeline. It may not appear that anything happens but the script runs in background without any pop-ups.

Figure 19 Raspberry Pi Video Configuration Script

After the script runs, double-click on the Qt V4L2 test Utility icon to start the video capture application. A window will open then press the green play button to start video capturing.

Figure 20 Video Capture Button

The capture window will look like below.

Figure 21 Sample Video Capture

Note

Some displays may have vertical/horizontal lines. This is typically an artifact caused on HDMI monitors and unrelated to the evaluation setup.

Power-off Sequence

• Open a terminal and type sudo poweroff. This will safely power off the Raspberry Pi 4 and ensure that the SD card is properly unmounted.

• Remove the power supply from the Raspberry Pi 4.

• Remove the power supply from the MAX96724 EV kit.

Getting the Software

The GMSL Linux kernel drivers, the complete Linux distributions for the supported processing platforms, and software user guides can be found on the Analog Devices GMSL GitHub repository.

Tips for Troubleshooting

There are a few key commands in the Linux environment that can help identify if the expected connections and communications have been made.

1. In the Linux environment, you can check to see if the Rpi I2C is detecting the GMSL boards by sending a I2C detect command [1] as follows:

   ~$
   

   sudo i2cdetect -y 10
   

   The Result should look as follows in the terminal:

   user@kuiper-gmsl:~$
   

   sudo i2cdetect -y 10
   

   [sudo] password for analog:
        0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
   00:                         -- -- -- -- -- -- -- --
   10: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   20: -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- --
   30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   60: -- -- -- -- 64 -- -- -- -- -- -- -- -- -- -- --
   70: -- -- -- -- -- -- -- --
   

2. You can also confirm that the video for Linux application is detecting the camera and GMSL devices by using the following command:

   ~$
   

   v4l2-ctl --list-devices
   

   The response should look like the following:

   ~$
   

   v4l2-ctl --list-devices
   

   bcm2835-codec-decode (platform:bcm2835-codec):
       /dev/video10
       /dev/video11
       /dev/video12
       /dev/video18
       /dev/video31
       /dev/media2
   
   bcm2835-isp (platform:bcm2835-isp):
       /dev/video13
       /dev/video14
       /dev/video15
       /dev/video16
       /dev/video20
       /dev/video21
       /dev/video22
       /dev/video23
       /dev/media1
       /dev/media3
   
   unicam (platform:fe801000.csi):
       /dev/video0
       /dev/video1
       /dev/media4
   
   rpivid (platform:rpivid):
       /dev/video19
       /dev/media0
   

   The key is to identify the unicam output, which correspond to the Raspberry Pi camera setup.

[1]

More information about these commands found at mankier.com/8/i2cdetect.