ReComputer & ReServer Industrial GPIO Instruction [Jetpack 6]

[sniper7kills]

I am currently attempting to get a 5G card working in the ReComputer Industrial 4012 using Jetpack 6.0

The provided commands in the wiki are:

sudo su 
cd /sys/class/gpio
echo 309 > export 
cd gpio309
echo out > direction
echo 0 > value

cd..
echo 341 > export 
cd PEE.02
echo out > direction
echo 1 > value

cd..
echo 330 > export 
cd PCC.02
echo out > direction
echo 0 > value

It appears that in Jetpack 6.0 the use of /sys/class/gpio is depreciated; and one must use libgpio.

I tried to duplicate the instructions using the following commands:

sudo gpioset gpiochip2 9=0
sudo gpioset gpiochip1 25=1
sudo gpioset gpiochip1 14=0

However after running these commands / a reboot I can not see the 5G card when running lspci or lsusb.

I would appreciate any guidance that can be provided; and would love to open a PR to reflect any progress I am able to make.

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[yuyoujiang]

Hi sniper7kills, The new jp6 image has been updated during the wiki. You can try again with new jp6 image.

[sniper7kills]

Hi sniper7kills, The new jp6 image has been updated during the wiki. You can try again with new jp6 image.

Can you confirm? I still only see the JP6 Image from 2024-06-14.

Additionally; the same thing exists in the JP6 ReServer Industrial image dated 2024-07-03.

[sniper7kills]

Doing additional testing on my ReServer Industrial; I was able to compile the following C program.

#include <stdio.h>
#include <stdlib.h>
#include <gpiod.h>
#include <unistd.h>
#include <signal.h>

#define CONSUMER "gpio-control"

struct gpiod_chip *chip0, *chip1, *chip2;
struct gpiod_line *line309, *line315, *line329, *line330, *line341;

volatile sig_atomic_t stop = 0;

void inthand(int signum) {
    stop = 1;
}

void setup_gpio() {
    chip0 = gpiod_chip_open("/dev/gpiochip0");
    chip1 = gpiod_chip_open("/dev/gpiochip1");
    chip2 = gpiod_chip_open("/dev/gpiochip2");

    if (!chip0 || !chip1 || !chip2) {
        perror("Open chip failed");
        exit(1);
    }

    line309 = gpiod_chip_get_line(chip2, 9); // M2B_PCI2_rst
    line315 = gpiod_chip_get_line(chip2, 15); // PSE_PWR_EN
    line329 = gpiod_chip_get_line(chip1, 13); // PCC.01 (LED)
    line330 = gpiod_chip_get_line(chip1, 14); // PCC.02
    line341 = gpiod_chip_get_line(chip1, 25); // PEE.02

    if (!line309 || !line315 || !line329 || !line330 || !line341) {
        perror("Get line failed");
        exit(1);
    }

    gpiod_line_request_output(line309, CONSUMER, 0);
    gpiod_line_request_output(line315, CONSUMER, 0);
    gpiod_line_request_output(line329, CONSUMER, 0);
    gpiod_line_request_output(line330, CONSUMER, 0);
    gpiod_line_request_output(line341, CONSUMER, 0);
}

void enable_m2_slot() {
    gpiod_line_set_value(line309, 0);
    gpiod_line_set_value(line341, 1);
    gpiod_line_set_value(line330, 0);
    printf("M2 slot enabled for 5G card\n");
}

void enable_poe() {
    gpiod_line_set_value(line315, 1);
    printf("PoE enabled on eth1-4\n");
}

void flash_led() {
    printf("Flashing LED on front panel. Press Ctrl+C to stop.\n");
    while (!stop) {
        gpiod_line_set_value(line329, 1);
        usleep(500000);
        gpiod_line_set_value(line329, 0);
        usleep(500000);
    }
    printf("LED flashing stopped\n");
}

void cleanup() {
    gpiod_line_release(line309);
    gpiod_line_release(line315);
    gpiod_line_release(line329);
    gpiod_line_release(line330);
    gpiod_line_release(line341);

    gpiod_chip_close(chip0);
    gpiod_chip_close(chip1);
    gpiod_chip_close(chip2);
}

int main() {
    signal(SIGINT, inthand);

    setup_gpio();
    enable_m2_slot();
    enable_poe();
    flash_led();
    cleanup();

    return 0;
}

When running on my ReServer Industrial 4012; I don't get any errors; and the green "run" light flashes as expected. But it does not appear that the M.2 slot gets enabled as the LED that is supposed to turn on; doesn't.

[yuyoujiang]

now the download link of reComputer Industrial J4012 should be up to date. 😄 https://github.com/Seeed-Studio/wiki-documents/pull/1437

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✅ @sniper7kills

This issue is closed, If you have any questions, you can comment and reply.

[sniper7kills]

My apologies for the delay in my response; but I am still facing this issue. (This is a weekend project for me)

/sys/class/gpio still doesn't exist and using GPIOSET or my C program; I am unable to get the M2.B slot to turn on for the 5G card.

Additional research since re-flashing I found the following forum thread: https://forums.developer.nvidia.com/t/how-to-dynamically-set-gpio-in-jetpack-6-0dp/277715/11

Do I need to change any pinmux settings; I just flashed my ReComputer Industrial with the mfi_recomputer-industrial-orin-nx-16g-j201-6.0-36.3.0-2024-07-04.tar.gz file from the WIKI with an md5sum of b20da6a8f6ca1931b00b57f8db229764

[bigbearishappy]

@sniper7kills Hello, Can you check the voltage of those three gpio to find out which gpio is not working properly? I checked the pinctrl code of those three pins. It seems that the pee2 is not configured well. I fixed it and trying to verify if it works fine. I will feedback to you after I finished my test.

[bigbearishappy]

@sniper7kills It's figured out that it's a problem of pinctrl. I have fixed it in ths commit. I tried both JP5 and the latest JP6. It seems that pee2 can't be controlled by gpioset command in both of them. Finally, I can control it with a C program just like you used before.

Here is the details of my program:

#include <gpiod.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
    const char *chipname = "gpiochip1";
    unsigned int line_num = 25;  // GPIO number
    struct gpiod_chip *chip;
    struct gpiod_line *line;
    int ret;

    chip = gpiod_chip_open_by_name(chipname);
    if (!chip) {
        perror("gpiod_chip_open_by_name");
        return -1;
    }

    line = gpiod_chip_get_line(chip, line_num);
    if (!line) {
        perror("gpiod_chip_get_line");
        gpiod_chip_close(chip);
        return -1;
    }

    ret = gpiod_line_request_output(line, "example", 0);
    if (ret < 0) {
        perror("gpiod_line_request_output");
        gpiod_chip_close(chip);
        return -1;
    }

    gpiod_line_set_value(line, 1);
    sleep(2);
    gpiod_line_set_value(line, 0);
    sleep(2);
    gpiod_line_set_value(line, 1);
    sleep(2);

    gpiod_line_release(line);

    gpiod_chip_close(chip);

    return 0;
}

compile details:

sudo apt install libgpiod-dev
gcc pee2_test.c -o pee2_test -lgpiod
./pee2_test

We will release a new version of system image after we tested it. Or you can reflash your device by following the steps in seeed's Llinux_for_Tegra.

I hope this can help you~

[sniper7kills]

@bigbearishappy Thank you; I tried flashing using the instructions in source; but ran into an issue when booting about a partition not being able to be mounted. I'll simply wait for the new official image to be released.

[bigbearishappy]

OK, we will feedback to you after the new image have been uploaded.~

[yuyoujiang]

The new download link of BSP has updated. https://github.com/Seeed-Studio/wiki-documents/pull/1538

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This issue is closed, If you have any questions, you can comment and reply.