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PPS + GPRMC (GPS_sync) supplied, but stuck in timestamp_type 4 (PPS) instead of 3 (GPS) #212

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opened 2023-10-31 18:34:55 +01:00 by supercrazysam · 5 comments
supercrazysam commented 2023-10-31 18:34:55 +01:00 (Migrated from github.com)
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Hi,

I am supplying PPS signal and sending GPRMC to the "enable_timesync" port, however the timestamp_type always stuck at 4 (PPS).

It never gets to 3 (GPS).

Also, in the livox viewer, it says sync abnormal but does not offer more information other than that.

Have anyone encountered this issue before? Any advice on how to solve this would be appreciated.

================================================
Screenshots:

Screenshot from 2023-10-31 13-31-39

Screenshot from 2023-10-31 11-45-04

Hi, I am supplying PPS signal and sending GPRMC to the "enable_timesync" port, however the timestamp_type always stuck at 4 (PPS). It never gets to 3 (GPS). Also, in the livox viewer, it says sync abnormal but does not offer more information other than that. Have anyone encountered this issue before? Any advice on how to solve this would be appreciated. ================================================ Screenshots: ![Screenshot from 2023-10-31 13-31-39](https://github.com/Livox-SDK/Livox-SDK/assets/25998453/85d3b68f-b34f-4ce9-96f9-84b79fd1c580) ![Screenshot from 2023-10-31 11-45-04](https://github.com/Livox-SDK/Livox-SDK/assets/25998453/555e7937-f8d4-439f-b185-95e000bec09f)
freexiaofan commented 2024-01-31 02:21:12 +01:00 (Migrated from github.com)
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hello，I have the same problem, can you tell me your solution? 3Q -_-

hello，I have the same problem, can you tell me your solution? 3Q -_-
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supercrazysam commented 2024-02-01 22:21:26 +01:00 (Migrated from github.com)
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hello，I have the same problem, can you tell me your solution? 3Q -_-

I was not able to find a solution for this. If you were able to crack this, please do let me know how.
Much appreciated.

Good luck on your debugging journey bro.

Sincerely,
Sam

> hello，I have the same problem, can you tell me your solution? 3Q -_- I was not able to find a solution for this. If you were able to crack this, please do let me know how. Much appreciated. Good luck on your debugging journey bro. Sincerely, Sam
ZHG169 commented 2025-08-18 11:17:04 +02:00 (Migrated from github.com)
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Hi, may I ask if you were able to successfully resolve this issue? We were originally able to achieve synchronization, but suddenly we ran into this problem and haven’t been able to solve it.

Hi, may I ask if you were able to successfully resolve this issue? We were originally able to achieve synchronization, but suddenly we ran into this problem and haven’t been able to solve it.
supercrazysam commented 2025-08-18 15:46:03 +02:00 (Migrated from github.com)
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@ZHG169 unfortunately nope. I moved on to other projects.

DJI need to fix their stuff and documents stuff better. Letting user brute-forcing to see which setup works is unacceptable.

@ZHG169 unfortunately nope. I moved on to other projects. DJI need to fix their stuff and documents stuff better. Letting user brute-forcing to see which setup works is unacceptable.
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freexiaofan commented 2025-08-19 03:27:42 +02:00 (Migrated from github.com)
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As for GPRMC, it might be that the messages it transmits are not standard enough, either long or short, and there are errors such as several messages being sent at the same time.

As for GPRMC, it might be that the messages it transmits are not standard enough, either long or short, and there are errors such as several messages being sent at the same time.
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Reference: mmr/Livox-SDK#212
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