HW sync undefined behaviour

[ankarako]

---

Required Info
Camera Model	D415
Firmware Version	5.9.14
Operating System & Version	Win10
Platform	PC
SDK Version	2.13 & 2.14
Language	C++
Segment

Issue Description

Hello, doing some experiments with HW syncing.

• Does the HW sync imply Internal (Depth & Color Sensor) Sync? That is, are the depth-color streams of the same device synced? (I think that the answer is NO).
• Setting a device as MASTER (and forgetting about any other device) seems to have undefined behavior regarding color. I monitored the following:
  • The device does not produce any color frames
  • the device produces color and depth frames, but not at the correct rate (MASTER's clock)
  • The devices hangs.
    What may cause that behavior?

Even if I set the device as master, and then open the rs-viewer, the color stream is not available. However, the depth stream seems to be OK.

Any help is really appreciated.
P.S.: Does HW sync concern only the depth sensor or the color too? If it does apply only for the depth sensor, is there a way to achieve Depth-Color Sync?

[RealSense-Customer-Engineering]

[Realsense Customer Engineering Team Comment]
Hi

Here is how to enable the Sync feature on D415:
0) Refer to the attached picture;

1. RS-viewer must be version 2.13.0 or newer; Firmware version must be 5.9.14.0 or newer;
2. Depth and Color sensors must be set at same frame rate (i.e. 30fps )
3. "Inter Cam Sync Mode" set to "1.000"; (Default: 0.000; Master: 1.000; Slave: 2.000).
4. Color sensor, the "Enable Auto Exposure" must be Unchecked !!!
5. Keep in mind: Always start Depth camera first, then start the Color sensor; (Depth is master, Color is Slave)
6. To verify the Sync feature, see the number under icon "i"; they should be same. (see attached picture: "30.01" fps for both Depth and Color)

Thanks

[ankarako]

Hello,

Thank you for your response. The steps I followed are just the same as the ones you mention (however there is no attachment). The device's behavior is still random. (I noticed that with the 2.14 rs-viewer the rgb sensor does not stream at all, but with the 2.13 sometimes it works as expected and sometimes hangs. Sometimes I get a Hardware Notification about a RT MIPI Error.)
The following is a link to a gif that captures my screen and presents the randomness I mentioned.
(The file was bigger than what github allows, so I uploaded it on imgur).

rs-viewer 2.13 screen capture

[RealSense-Customer-Engineering]

[Realsense Customer Engineering Team Comment]
Hi

After you turn off RGB camera (under Slave mode), please wait 5 seconds to let it fully discharge and then you can turn on RGB camera again. This usually can bring up RGB camera normally.

Thanks

[RealSense-Customer-Engineering]

[Realsense Customer Engineering Team Comment]
Hi

Are you asking Sync feature on a single camera or on multiple cameras?

Here is the Whitepaper regarding camera sync usage: see "Multi-camera_Configurations_whitepaper.PDF"
https://realsense.intel.com/intel-realsense-downloads/#whitepaper

Thanks