PPS On Jetson Nano

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Can the jetson nano enable PPS as raspberry pi?

I work with the jetson nano recently and try to synchronize it with GPS. I know the raspberry pi can easily set pin 18 as PPS pin and then do synchronization with GPS.

Any idea to do the same thing on jetson nano?

Thanks

2

Hi, please refer to this comment: [url]https://devtalk.nvidia.com/default/topic/970586/jetson-tx1/adding-pps-input-to-tx1-for-line-discipline/post/5016014/#5016014[/url]

3

Hi Trumany,

I checked it, but I believe there should be a easier way to achieve it. The chip after TX1 can support the PPS.

I followed https://devtalk.nvidia.com/default/topic/1035352/pps-drivers-not-installing/, and enable the pps from the kernel, but it shows the time out every time when I

sudo ppstest /dev/pps0

For more detail, I added the pps device to the device tree (pin 18):

Linux_for_Tegra/sources/hardware/nvidia/soc/t210/kernel-dts/tegra210-soc/tegra210-soc-base.dtsi

pps {
        gpios = <&gpio TEGRA_GPIO(B, 7) 0>;

        compatible = "pps-gpio";
        status = "okay";
    };

I want to know is there any easier way to make it work?

Thanks

4

I think I fix this issue because it’s physical pin 18 and gpio15 (Sysfs GPIO) and I use the wrong pin to get PPS signal.