Cannot simultaneously use IMX477-camera and PWM at 33 pin on Jetson Nano

Nvidia Jetson Nano/NX Cameras
1

1.Which seller did you purchase the product(s) from?
Arducam distributors
2.The Model number of the product(s) you have purchased?
IMX477 motor focused (https://www.arducam.com/product/arducam-12mp-imx477-motorized-focus-high-quality-camera-for-raspberry-pi/)
3.Which Platform are you using the product(s) on?
Jetson Nano B01
4.Which instruction are you following?
Installed driver via this tutorial: https://www.arducam.com/docs/camera-for-jetson-nano/native-jetson-cameras-imx219-imx477/imx477-how-to-install-the-driver/
5.Has your product ever worked properly?
Camera IMX477 works properly with installed driver
6.What problems are you experiencing?
I can’t simultaneously use the IMX477 camera and the hardware PWM on pin 33 on the Jetson Nano.

Infinity cycle:
When I install the driver dor IMX477 using the instructions (https://www.arducam.com/docs/camera-for-jetson-nano/native-jetson-cameras-imx219-imx477/imx477-how-to-install-the-driver/), the device-tree is updated and the FDT field appears in the /boot/extlinux/extlinux.conf, i. e. DT-file is tegra210-p3448-0000-p3449-0000-b00-imx477.dtb. In this case, the camera works.

However, if I activate the hardware PWM on the 33 pin Jetson Nano using jetson-io.py, the device-tree is updated again and the lines appear in /boot/extlinux/extlinux.conf:
LABEL JetsonIO
MENU LABEL Custom 40-pin Header Config
LINUX /boot/arducam/Image
FDT /boot/kernel_tegra210-p3448-0000-p3449-0000-b00-user-custom.dtb
INITRD /boot/initrd
APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0

I need to use the camera and the PWM at the same time. What can I do? Thank you.
7.What attempts at troubleshooting have you already made?

8.How would you like us to help you?
Steps, what should I change in tegra210-p3448-0000-p3449-0000-b00-imx477.dts file (so I need this file too) to enable PWM on 33 pin in tegra210-p3448-0000-p3449-0000-b00-imx477.dtb

2

Hi @Andrey

Can you tell me the L4T version you are using?
You can use the cat /etc/nv_tegra_release command to view.

3

If you are using L4T32.6.1, you can use /opt/arducam/jetson-io/jetson-io.py to set GPIO.

If you are using a version prior to L4T32.6.1, then you can try to move the dtb file in the /boot/dtb/ directory to another directory to make a backup, then copy /boot/arducam/tegra210-p3448-0000-p3449-0000-b00-imx477.dtb to /boot/dtb, and then run jetson- io.

4

Hello! Thank you for your answer.

My L4T version is 32.5.1:
$ cat /etc/nv_tegra_release

R32 (release), REVISION: 5.1, GCID: 26202423, BOARD: t210ref, EABI: aarch64, DATE: Fri Feb 19 16:45:52 UTC 2021

I have jetson-io.py only in /opt/nvidia/jetson-io/ folder and don’t have /opt/arducam/ folder. Does it present only for L4T32.6.1 and newer or you meant /opt/nvidia folder?

I think I got your idea: .dtb file in /boot/dtb it is the base device tree file for Jetson Nano and jetson-io.py uses this file as a base and changes it in order to configure 40-pin-header. If I make back-up of /boot/dtb/kernel_tegra210-p3448-0000-p3449-0000-b00.dtb file and replace boot/dtb/kernel_tegra210-p3448-0000-p3449-0000-b00.dtb with device tree from Arducam for imx477, then jetson-io.py will make changes to this file and make possible to use <imx477 device tree> + <changes for PWM usage>. Am I right?

Thank you. I will try it later and report. However, in future we may need to construct our own .dts file for Jetson Nano. So is it real to get tegra210-p3448-0000-p3449-0000-b00-imx477.dts file in order to view changes and merge it with our own one?

5

Hi @Andrey

I have jetson-io.py only in /opt/nvidia/jetson-io/ folder and don’t have /opt/arducam/ folder. Does it present only for L4T32.6.1 and newer or you meant /opt/nvidia folder?
Yes, /opt/arducam was added in L4T-R32.6.1.
I think I got your idea: .dtb file in /boot/dtb it is the base device tree file for Jetson Nano and jetson-io.py uses this file as a base and changes it in order to configure 40-pin-header. If I make back-up of /boot/dtb/kernel_tegra210-p3448-0000-p3449-0000-b00.dtb file and replace boot/dtb/kernel_tegra210-p3448-0000-p3449-0000-b00.dtb with device tree from Arducam for imx477, then jetson-io.py will make changes to this file and make possible to use <imx477 device tree> + <changes for PWM usage>. Am I right?
you are right.
Thank you. I will try it later and report. However, in future we may need to construct our own .dts file for Jetson Nano. So is it real to get tegra210-p3448-0000-p3449-0000-b00-imx477.dts file in order to view changes and merge it with our own one?
You can contact [email protected] or leave your email here, I will send the kernel patch to you.