How to reinitialize the pwm which triggers the camera

[alex.wu]

DRIVE AGX Xavier control cameras through pwm, but this pwm driver does not guarantee that the camera exposure is in sync with other sensors. So I want to reinitialize the pwm module to dynamically adjust the trigger time of camera exposure. How can I do to achieve this?

I’ve tried a lot of things and it doesn’t work, and I’ve read a lot of articles from this forums and can not find a way to solve it.

Part of articles I’ve read:

xavier pwm control

how can I write interface to write pwm from xavier pins? all the tutorials talk about connect the jetson TX1/2 to arduino and then use the arduino pwm but the xavier has already pwm pins. so where is the interface to write pwm?? I want to use c++ to control servo motor

Can i control LCD1_BKLT_PWM?

hi BSP version is R28.1 /sys/class/pwm/pwmchip0 → LCD0_BKLT_PWM → OK /sys/class/pwm/pwmchip1 → N/A /sys/class/pwm/pwmchip2 → LCD1_BKLT_PWM → Not OK /sys/class/pwm/pwmchip3 → FAN_PWM → OK echo 0 | sudo tee -a /sys/class/pwm/pwmchip[port]/export echo $period | sudo tee -a /sys/class/pwm/pwmchip[port]/pwm0/period echo $duty | sudo tee -a /sys/class/pwm/pwmchip[port]/pwm0/duty_cycle echo 1 | sudo tee -a /sys/class/pwm/pwmchip[port]/pwm0/enable Can i control LCD1_BKLT_PWM ?

https://forums.developer.nvidia.com/t/tx2-4-r32-3-1-tegra-pwm6-missing/166775/29https://forums.developer.nvidia.com/t/can-fan-pwm-be-used-for-pulse-counting/58546/9

Now I am trying this method, but I encountered some problem.

When I write 0 to /sys/class/pwm/pwmchip1/export to reinitialized the pwmchip1, the Device or resource busy showed below.

[SivaRamaKrishnaNV]

Dear @alex.wu,
If the idea is to sync camera and other sensors, could you check if the discussion on Camera triggering based on Lidar Scan helps.

[alex.wu]

I’m sorry. I have read this topic and nothing helped.

[VickNV]

@alex.wu
Please provide the following info by ticking the checkboxes:
Software Version
DRIVE OS Linux 5.2.6
DRIVE OS Linux 5.2.6 and DriveWorks 4.0
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
NVIDIA DRIVE™ Software 10.0 (Linux)
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version
other

Target Operating System
Linux
QNX
other

Hardware Platform
NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)
other

SDK Manager Version
1.8.3.10426
other

Host Machine Version
native Ubuntu 18.04
other

[alex.wu]

The corresponding information is as follows:

Software Version
NVIDIA DRIVE™ Software 10.0 (Linux)

Target Operating System
Linux

Hardware Platform
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)

SDK Manager Version
1.8.3.10426

Host Machine Version
native Ubuntu 18.04