<![CDATA[I want to synchronize the two cameras in sync mode.]]>Hi,

I want to synchronize the two cameras in sync mode.
However, I don't think the sync signal is being sent correctly.
Please let me know what I am doing wrong.

  1. It works fine before the synchronization setting.

9774.jpg

  1. The slave side captures a blue image when the synchronization is set as follows.
# 配置cam0为主
./fpdlink3_i2c_jetson.sh -f sync_init -p 0 -p1 0 -b 7
./cs_mipi_i2c.sh -w -f streammode -p1 1 -p2 0 -b 7 -d 0x3b

# 配置cam1为从
./fpdlink3_i2c_jetson.sh -f sync_init -p 0 -p1 1 -b 8
./cs_mipi_i2c.sh -w -f streammode -p1 1 -p2 1 -b 8 -d 0x3b

9543.jpg

  1. The wiring is as follows.

9573.jpg

Environment:
JetPack 4.4.1
Jetson Nano B01
CS-MIPI-IMX307-fpdlink

]]>http://forum.veye.cc/topic/22/i-want-to-synchronize-the-two-cameras-in-sync-modeRSS for NodeSat, 05 Sep 2026 11:58:17 GMTSun, 21 Mar 2021 03:07:33 GMT60<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Mon, 22 Mar 2021 12:21:59 GMT]]>@veye_xumm

I understood that the synchronization signal is very accurate in an environment close to hardware.

We will check the details from time to time.

]]>http://forum.veye.cc/post/110http://forum.veye.cc/post/110Mon, 22 Mar 2021 12:21:59 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Mon, 22 Mar 2021 00:58:09 GMT]]>@octa_yk
Hi,
The sync signal is very accurate.
The difference timing your pictures show is actually because of the v4l2 buffer + gstreamer pipline buffer+HDMI display refresh rate . In addition, be careful not to introduce new errors because the sensor of the phone you are taking photos is rolling shutter.
Here are my suggestions for measurement.

  1. Find a stopwatch with sufficient precision. Using the computer screen to display the stopwatch, due to the refresh rate, the accuracy is very poor.
  2. Set the exposure time manually to a very small value, which is recommended 1ms.
  3. Recording for both cameras at the same time. Generate two video files.
  4. Use the player to play two videos frame by frame, and you will find pairs of pictures that match the time.
    Note that the gstreamer video record may lose a small number of frames.
    Among them, 2+3+ 4 must be done.

Here is my suggestion, you'd better not use gstreamer for application development, if you do, be sure to pay attention to buffer.It is recommended that you directly call the v4l2 API to get the data.

]]>http://forum.veye.cc/post/108http://forum.veye.cc/post/108Mon, 22 Mar 2021 00:58:09 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 12:04:39 GMT]]>@veye_xumm

Thank you very much.
I fixed the wiring and was able to import the video successfully.

Please tell me one point.
I know that the synchronized images do not have exactly the same timing, but how many milliseconds is the accuracy of the synchronization?

b0bc41ec-4a6f-46df-bfd5-e7d39137d0a4-image.png

]]>http://forum.veye.cc/post/106http://forum.veye.cc/post/106Sun, 21 Mar 2021 12:04:39 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 07:31:18 GMT]]>@octa_yk
I think you use the wrong pin for SYNC signal. You should use J7-3 and J1-3, not J7-1 and J1-1.

SYNC signal connect J7-3 to J1-3,J7-2 to J1-2.
7a28781c-e953-4632-915c-3d818e3a32fb-image.png

]]>http://forum.veye.cc/post/105http://forum.veye.cc/post/105Sun, 21 Mar 2021 07:31:18 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 06:57:44 GMT]]>@veye_xumm

I upgraded the version using the following file, but I still get the same blue image.

https://www.mediafire.com/file/ellhe2jtv32bh1o/CS-MIPI-IMX307_FV2.36_LV3.3_20210303.bin/file

Is there any other place to check?

$ sudo ./veye_mipi_i2c.sh -r -f hdver -b 7
====I2C write:<0x3b> <0x7> <0xfe>====
hardware version is 0x 2
$ ./cs_mipi_i2c.sh -r -f firmwarever -b 7
r firmware version is  2.36

$ sudo ./veye_mipi_i2c.sh -r -f hdver -b 8
====I2C write:<0x3b> <0x7> <0xfe>====
hardware version is 0x 2
$ ./cs_mipi_i2c.sh -r -f firmwarever -b 8
r firmware version is  2.36
]]>http://forum.veye.cc/post/104http://forum.veye.cc/post/104Sun, 21 Mar 2021 06:57:44 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 06:06:05 GMT]]>@octa_yk
YES.
http://wiki.veye.cc/index.php/USB_firmware_update_app_note

]]>http://forum.veye.cc/post/103http://forum.veye.cc/post/103Sun, 21 Mar 2021 06:06:05 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 03:39:07 GMT]]>@veye_xumm

  1. Camera firmware version
$ sudo ./veye_mipi_i2c.sh -r -f hdver
====I2C write:<0x3b> <0x7> <0xfe>====
hardware version is 0x 2
$ ./cs_mipi_i2c.sh -r -f firmwarever
r firmware version is  2.27
  1. Wiring (J1-J7)
    3f23af97-cf76-4603-98b3-62358c95cdb5-image.png

Is it likely that updating the firmware on the camera will fix the problem?

]]>http://forum.veye.cc/post/102http://forum.veye.cc/post/102Sun, 21 Mar 2021 03:39:07 GMT<![CDATA[Reply to I want to synchronize the two cameras in sync mode. on Sun, 21 Mar 2021 03:15:20 GMT]]>@octa_yk

  1. please check your camera firmware version first, refer to this:
    http://wiki.veye.cc/index.php/CS-MIPI-IMX307_version_log
  2. I think you are following this part,
    http://wiki.veye.cc/index.php/FPD_LINK_III_for_Jetson#CS-FPD-CAM-IMX307_sync_mode.EF.BC.8Cconnnect_to_Jetson_Nano_B01.2FNX
    Please check these connection:
    835800be-39f2-4ffd-84a8-7285188fb5d2-image.png
]]>http://forum.veye.cc/post/101http://forum.veye.cc/post/101Sun, 21 Mar 2021 03:15:20 GMT