JAO: TSC with PPS or PTP

[liyutai]

Hi NV Support Team
From Orin deafult pinmux setting: the camera frame sync used TSC_EDGE_OUT2/3/0.
From TRM part VII-Timers: TSC can use PPS or PTP for reference tracking.
My query is that if TSC_EDGE pins are available on Jetson Orin to support tracking PPS or PTP ?

Thanks
Yutai

[JerryChang]

hello liyutai,

please see-also similar discussion thread, Topic 224203, there’s an issue that pps fetch will timeout.
we’re still checking this internally.

[liyutai]

Hi Jerry
We want to use TSC_EDGE_OUT feature for camera frame sync. Do you have any reference code?
I dont think it is similar thread.

Thanks
Yutai

[JerryChang]

hello liyutai,

FYI, these pins, TSC_EDGE_OUT*, do not have kernel driver enabled for L4T.
we had some discussion internally for future plans, will update after we come out conclusions.

[liyutai]

Thanks, Jerry
One more query: if the TSC not support in L4T now. How about the workaround soultion to use PMW as camera frame sync.
Do you have any code support it.

Thanks
Yutai

[JerryChang]

hello liyutai,

you may also refer to Topic 1070823 for dual camera frame synchronization.
thanks

[liyutai]

So the getSensorTimestamp use PWM signal ?

[JerryChang]

hello liyutai,

no, getSensorTimestamp() it returns kernel timestamp (i.e. MONOTONIC_RAW) of sensor start-of-frame.
you are also able to fetch start-of-frame and end-of-frame timing via TSC HW timestamp.
it returns the VI HW (SoF/EoF) timestamp based-on tegra wide timestamp system counter (TSC), it’s the timestamp for the sensor (unit in nanoseconds).
for example, Argus::Ext::ISensorTimestampTsc::getSensorSofTimestampTsc.

syncSensor sample is a software approach, it duplicate single capture request to these two camera sensors.
the idea is having implementation of timestamp comparison from user-space to achieve synchronization results.

[liyutai]

Thanks, But you mention before: TSC HW Timestamp not support in current L4T.
So my query is that which resource i can used now.

[JerryChang]

hello liyutai,

sorry for confusion, it’s no low-level driver support for this hardware pin, TSC_EDGE_OUT.
you’re able to use the API to fetch the VI HW (SoF/EoF) timestamp.