Dtoverlay=gpio-shutdown behavior on Jetson Nano?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

I’m looking to migrate a project from a Raspberry Pi to the Jetson Nano and one behavior I’d like to cross over is the ability to pull a pin high after the Jetson has safely shut down. For the Raspberry Pi I simply put dtoverlay=gpio-poweroff,gpiopin=17 in /boot/config.txt. I did a bit of research and the only lead I have so far is setting “pinmux” configurations by flashing the Jetson. However, I couldn’t find any descriptors that seemed to give the behavior I want.

What I need precisely is any single pin on the GPIO header to flip high (and stay high) to at least 3.3V after a shutdown (not a reboot) routine completes.

Thanks in advance!

3

hello woz4tetra,

there’re several approaches for your reference to access GPIO for usage.

  1. you may control GPIO pin via system nodes, shown some sample to export pin for controlling.
* Generate gpio220 name
echo 220 > /sys/class/gpio/export

* Configure GPIO manually
echo 1 > /sys/class/gpio/gpio220/value
  1. please access L4T sources via download center. check below header file for GPIO APIs.
    you may have implementation and control them in the kernel drivers.
    for example,
    $L4T_Sources/r32.4.2/Linux_for_Tegra/source/public/kernel/kernel-4.9/include/linux/gpio.h 
static inline int gpio_get_value(unsigned int gpio)
{
        return __gpio_get_value(gpio);
}

static inline void gpio_set_value(unsigned int gpio, int value)
{
        __gpio_set_value(gpio, value);
}
  1. you may also refer to Jetson-gpio python library, whihc enables the use of Jetson’s GPIOs.
    thanks